Trials Maths

Some more trials bike mathematical considerations on a Sunday night:

The madness of Ontario used off-road bike prices continues.  Here's a 20 year old bike that needs a lot of work:

2001 gasgas TXT 200 trials bike in good shape, runs good , needs fork seals and brake work.

$3200 obo

So, you drop over three grand on it and then have to buy parts and rebuild the suspension and brakes.  You're probably over four grand before you turn a wheel on this old, worn out thing.

or

A 2021 (as in brand new) Tanaci-Wong TWL200 Trials Bike:

Integrated electric start

Electronic fuel injection

Butter smooth hydraulic clutch

Ultra-progressive hydraulic brakes

Lightweight billet aluminum swing arm

Adjustable billet aluminum brake pedal

Billet aluminum triple clamps

High-quality flexible plastics

Transparent fuel tank means no more guessing

All chassis fasteners are high-grade stainless steel

Well protected exhaust system means no costly replacements

$3495 plus PDI/shipping/taxes


So, my option is to drop four grand on a 20 year old, broken bike, or spend the same amount on a brand new machine?  Someone's going to say, "yeah, but that's a Chinese bike."  Where do you think all the parts on the GasGas were made?  Bet it wasn't Spain.

That Darned Tiger: Stalling issues on a Triumph Tiger 955i

The Tiger worked for a couple of months this spring but started recently stalling again.  The engine was getting rougher and any time I came off throttle quickly, such as downshifting, the engine would 'fall' right through where it normally idled and stall.  If I didn't downshift and let it drop to idle on the clutch it wouldn't stall.

If you're familiar with the blog then you know this isn't my first dance with Triumph's early fuel injection systems.  I've replaced the vacuum housing for the idle control system (a plastic piece that looks a bit under-engineered) and all the hoses and gaskets last year when chasing this thing, but looking over the deep winter maintenance I did I don't think I rebalanced the fuel injection after taking it all apart to clean it.

Balancing the FI on these 955i Triumphs is tricky because you have to take apart a lot of the bike just to get at the adjusters.  I've been in and out of this so many times that I'm quick - I don't even have to keep the fasteners sorted because I know where they all go.

To balance the fuel injection on a 955i Triumph engine, take the fuel tank and airbox off.  On the Tiger, if I put the fuel tank next to the bike the fuel lines are just long enough to connect so I can run the engine with the tank attached but off the bike.

I was going to use the Tuneboy to balance the injectors this time but couldn't figure out how to do it so just went back to good old-fashioned vacuum balancing.

Evidently you can balance throttle bodies off this but it jumps around so much I found it easier to use the vacuum balance I use for carburetors instead.  Perhaps the Inj #1, 2 & 3 P/W can be used to balance?

The Triumph triple is quite easy to balance once you've pulled it all apart.  The left side throttle (#1) isn't adjustable so you use it as your reference.  With that hose plugged in I balance the one next to it to #1 and then did the same with the far one.

I got this TecMate Carbmate Synchronizer from Fortnine last year and it makes the job quick, accurate and easy.  Just keep adjusting the screws between the throttle bodies until you have equal vacuum between them.

Don't balance two to three, just two to one and then three to one, so you don't need a non-existent three cylinder vacuum synchronizer.  I ended up buying the extender so I can do up to four carbs, but it isn't necessary for the Tiger, though it did come in handy on the Fireblade.

It took me about ten minutes to get everything from way out of whack to right on the green balanced light on the CarbMate.  Once I had it done the engine sounded less rough even with no airbox and missing sensors.

Running it like this pisses off the computer and throws up a whole bunch of warnings because you're not getting readings from the airbox sensor or the vacuum to engine management computer.  If you don't have a Tuneboy to clear the computer errors it takes a few runnings for the ECU to reset itself.  I just reset the errors in the Tuneboy system and then put it all back together again.

The bike immediately felt smoother and there were less backfires and hesitation when turning the throttle.  I took it out today and went for an extended ride and couldn't get it to stall even when doing things that caused frequent stalls last week, like down shifting to a stop and pulling the clutch as the engine was dropping in RPM.

If you're having stalling issues with a Triumph 955i fuel injected triple, balance the throttle bodies before you start chasing other issues.  Unbalanced throttle bodies cause stalling once the engine is hot.

I put some LockTite on the throttle body adjusters this time so hopefully it won't 'fall' out of adjustment again this riding season.  I'm still very concious of rubber parts perishing on this nearly twenty year old high-mileage bike.  Last summer's issues revolved around vacuum leaks in the idle control system so I'm going to keep a close eye on other rubber bits if I run into stalling issues again, but this time around it was just throttle body synchronization that seems to have done the trick.  Maybe next time I can work out how to do it with the Tuneboy so I can get it even more precise, though the CarbMate seems to have done the job with high fidelity.

NOTES & RESEARCH

955i Triumphs stalling links:

http://tkmotorcyclediaries.blogspot.com/2020/06/throttle-control-sensor-system-on-2003.html
http://tkmotorcyclediaries.blogspot.com/2020/07/triumph-955i-engine-stalling-next-steps.html
http://tkmotorcyclediaries.blogspot.com/2020/07/triumph-955i-stalling-issues-part-3.html
http://tkmotorcyclediaries.blogspot.com/2021/01/triumph-tiger-955i-old-rubbers.html

https://www.triumphrat.net/threads/955i-engine-stalls-need-help.16567/

Throttle balance?

https://www.thetriumphforum.com/threads/955i-stalls-and-wont-start-until-cold.27123/

https://www.thespeedtriple.com/threads/my04-speed-triple-stalls-the-engine.26192/

https://www.reddit.com/r/Triumph/comments/b45o3s/rough_idle_and_stall_out_problems/

Throttle balance (again) - do it with TUNEBOY this time!

Check rubber parts for perishing:

https://www.triumphrat.net/threads/stalling-and-fuel-adaption-problems.973460/

Tiger Testing After A Winter of Deep Maintenance

Road testing the Tiger on a cold (-3°C) day after a winter of deep maintenance.

The Good Stuff:

• the swingarm maintenance has transformed the rear suspension!  Unseized bearings mean the back end is supple and responsive now
• the front forks and steering feel brand new thanks to fork servicing and pulling the steering apart and re-greasing everything
• the new tires are spectacular! The old Michelins still looked ok but they were badly squared off and made the bike hesitant to turn - it drops into turns like a gymnast now!
• the deep cleaning on the fuel injection system has worked a charm.  It idles well and the fueling is excellent.
• the cosmetic touch-ups make the bike look much younger than it's 18 years and over 80k kms
• the new indicators suit the bike way better and work perfectly
• new horn is loud and works well

The Bad Stuff:

• I've bled the front brakes and they're tight now, but after repeatedly bleeding the rears they're still not what they were, though they do now produce some stopping power.  I need to check for any leaks and bleed again.
• The speedo doesn't show speed!  This has never been a problem before.  I'm going to check the connection to the gauge because I was knocking it around and might have knocked it loose
• speedo step two will be to raise the front end, remove the front tire and check how I installed the speedo unit - it only goes on one way so I'm not sure how that could be wrong but if the gauge check doesn't do anything that's the next step
• The engine light is on!  Though the engine feels fantastic, sounds great and the fuel injection which was problematic last year idles steady and fuels very smoothly.  The simple computer in the bike sometimes needs a few runnings to clear an error after a long time unpowered (like the 99 day Canadian winter break we had this long, cold, COVID-winter)
• engine light step two if it doesn't go off by itself is to connect the TuneBoy engine management system I've got and see what errors it's throwing up.

The bike goes and works better than it did in many regards before the winter-maintenance.  A couple of details and it seems ready to take on another short Canadian riding season.  I'm still hoping to hit 100k the year the bike turns 20 years old (2023).

Photos are all taken with a Ricoh ThetaV 360 camera wrapped around the wing mirror with a flexible tripod.  The camera is set to take a photo every four seconds then I just go for a ride and see what I caught when I get back.  Photos were edited in the Ricoh software and then touched up in Adobe Lightroom.

2003 Triumph Tiger 955i Winter Maintenance Continued

Winter Maintenance List:  https://tkmotorcyclediaries.blogspot.com/2020/11/tiger-winter-maintenance-list.html

Front end chassis maintenance:  https://tkmotorcyclediaries.blogspot.com/2020/12/triumph-tiger-955i-fork-reassembly-and.html

Rear end chassis maintenance:  https://tkmotorcyclediaries.blogspot.com/2021/01/triumph-tiger-955i-swingarm-installation.html

Got the backend back together yesterday:

Today it's the rear brake caliper going back on with new HEL brake line, then a brake bleed and if I have some extra time I'll finish up all the hardware bits and pieces on the front and rear and then turn to the engine.

The fuel injectors are coming out and getting ultrasonically cleaned and the rest of the system's getting a flush.

The odds and ends went together well.  Even the brakes were quick to bleed, so with the wheels back on and the new brake lines installed I turned to the fuel injection.

The injectors highlighted in yellow above are press fit in and just pull out of  the throttle body and the fuel rail behind.

The fuel rail is held in by clips and two bolts holding it in place relative to the throttle body.

The whole thing just pops out when you've undone the two bolts.

With the fuel injectors so easy to remove, I'll be quicker at cleaning them in the future.

Ultrasonic cleaners aren't expensive and do a great job on fuel injectors.

Cleaning doesn't take long if you remove the rail and injectors.

Ultrasonic cleaning gets into the small places.

The injectors press fit back into the throttle body with a beefy o-ring to seal them.

My fuel-line replacements for unavailable replacement rubber hoses for the vacuum driven idle control system (on the right) scored a two out of three.  The far one on the left got kinked, so I cut back the hose and I'll see how it does shortened.  If that doesn't work I'll start looking for stronger walled alternatives.

Triumph Tiger 955i Swingarm Installation

It's my first time doing a motorcycle swingarm so I knew it would be a learn-as-I-go experience.  Today I reinstalled the swingarm and that was definitely a case of learning as I go.  I hope this post saves you a lot of swearing because I've already done it for you.

I had to lever the swingarm out with a tire iron, it's a tight fit in the frame.  Removing it was tricky but reasonably straightforward with the some leverage between the engine and the swingarm.

Undoing the top bolt on the shock was a bugger (it's in an awkward spot inside the frame) but small motions over and over again eventually got it loose.  The Chilton manual says to remove the exhaust system entirely (which also means the oil cooler and radiator), but that seemed like a big faff.  Adrian Molloy .com had some good advice: instead of taking half the bike apart just take the swingarm out with the rear shock attached then dismantle it off the bike.  Not sure what Chilton's thinking was in removing half the motor to get the swingarm out, but removing the rear shock with it is a much more efficient approach.

I cleaned up surface rust on the top of the rear shock and rust painted it.  After cleaning the unit it was still in good shape otherwise so I let the paint dry overnight and then aimed to service the swingarm and reinstall it today, which turned out to be a bugger of a job.  The right side sleeve in the swingarm pivot wasn't turning but the left side came out easily and still had grease on it.  I lightly heated the swingarm and tapped it through with a 15mm socket bit that fit the sleeves perfectly.  I then cleaned them up and got the bearings turning before looking them over.  Once freed up they got a thorough cleaning and re-greasing using the Mobil XHP222 grease Triumph recommends.  The stuff that came off wasn't the same colour (dark red instead of grey), so I suspect whoever was in there last just threw on whatever they had on hand.

Installing the swingarm was another bugger of a job. It's a tight fit and has thin washers that sit between the swingarm and the frame.  They move around when you're trying to squeeze the swingarm into the frame and drive you around the bend.  You can see them in that picture in the middle.  Every time you squeeze the swingarm in it pushes the washers out of place.  I put a 14mm socket in which holds them in place, but it's a finicky process that I just couldn't get right.

What finally did work was loosening the engine mount nut below the swingarm that holds the frame so tight to the swingarm.  Loosen that off and you can install the big through bolt into the the left side of the frame with that side's washer in place and then thread it through the swingarm.  Once the engine mount bolt is loosened off you can the slide the wash in on the other side and then finish pushing the big swingarm retaining bolt though before tightening everything up again.  Needless to say, I greased the hell out of all that too.

There might be a way to install the swingarm with those fussy washers another way, but it was beyond me and I was running out of expletives.  Loosening off the engine bolt is a top tip for swingarm installation.

I'd also recommend you do the swingarm service if you haven't as mine was essentially seized on one side even though it was in good shape otherwise.  I think the bike's going to feel much more responsive as a result thanks to all the chassis lubrication and maintenance I've been doing this winter.  Below is what that engine mount nut looks like (above the exhaust and under the swingarm).  Loosen that off and the swingarm installation is straightforward.

The lower bolt that holds the shock in place on the swingarm is always awkward as it lines up with the exhaust pipe (which is probably why Chilton wants you to remove the whole exhaust system along with the radiator and oil cooler necessitated by that).  Since the rear shock just drops out with the swingarm that seems like a wrong headed way to do it, but what do I know?  Once it's out the lower bolt for the shock is easy to access.

Everything is moving freely and easily back on the bike.  My weekend's up but I'm hoping I can get the back wheel on this week and finalize all the bits and pieces on both the front and back ends.  That'll end the chassis maintenance portion of our program which included:

• front fork removal, cleanup and new fork oil
• reconditioned the fork gaiters (was going to replace them but reconditioning did the trick)
• triple tree removal, cleanup and regreasing
• swingarm removal
• rear shock cleanup and reconditioning
• cleanup and regreasing of swingarm pivot 

Unmentioned but something I also did while things were in pieces were the brake lines that now have new, custom Hel performance brake lines on them.  They look fantastic, installed well (the kit had all the hardware including new hollow bolts as well as washers) and make a nice, not-so-subtle (they're SUPER ORANGE and disco blue) upgrade to the brakes.  They should offer better response than the stretched, old rubber hoses that were original to the seventeen year old Tiger.

When you've got the front end out installing the brake lines is easy.  Same with the back end, so why not do it while access is easy?  The brake fluid was due a change anyway as I last did it in 2017, so the lines weren't that expensive because the bike would have been getting new DOT4 fluid anyway.

Some advice on brake fluid:  don't buy a big bottle as once you've opened it time is ticking because the stuff absorbs moisture.  Just get what you need and no more.  Keep it sealed when you're not using it and use it as quickly as you can.  I'm about half way through a normal sized bottle of DOT4 having bled the front brakes.  I should be able to bleed the rears on that one bottle and then not have the rest going off.

To dos this week include:

• install the newly rear tired rim on the swingarm
• finish the rear brake line install and bleed it (can't do that until the caliper's back on the disk)
• go over all the fasteners front and rear and make sure they're all torqued up right

Once the chassis is sorted out I'll turn to the engine and go over the fuel injectors.  I think I can ultrasonically clean them in my new cleaner.  This isn't my first rodeo with the fuel system (it had issues last summer), so I'm hoping a deep service in the cold of a Canadian winter means my too-short riding season will be spent riding instead of swearing at faulty fuel injection in 2021.  No intermittent stalling this year!

Triumph Tiger 955i Steering Column/Triple Tree Maintenance

I finally got the top clamp of the 2003 Triumph Tiger's steering column off yesterday.  After undoing everything it did not let go of its own volition and I had to apply some heat to the central spindle and top clamp housing to let loose.  Nothing crazy, just grazing it with a propane torch until it warmed up nicely (nothing glowing) and then I was able to spin the top clamp in relation to the centre steering pin (the forks are out).

With the top clamp rotating (if it has been sitting in your Tiger for a while don't expect it to be loose), I was eventually able to persuade it upwards off the centre spindle with a rubber mallet.  The top clamp came off and the two nuts that hold the centre rod in place were accessible (they're visible but inaccessible under the handlebars usually).  For a 17 year old bike with over 80k kms on it nothing about these difficulties came as a surprise.

Those locking nuts are big'uns, 38mm!  The long centre post they're on means you're going to have a tricky time getting a ratchet on them (38mm long socket?).  They aren't tight though and I was able to loosen them with an adjustable wrench.

I supported the triple tree (the bottom half of the steering structure) with one hand while undoing the nuts but the bottom end didn't fall out - it's a snug enough fit and what grease was left in there was holding everything together.  A gentle tap on the centre spindle and it all came out the bottom smoothly though.  I don't know the last time anyone was in there, but I've had the Tiger for almost 4 years and thirty thousand kilometres so it was high time I got in there myself.  Judging by the stingy amount of grease in there I'd guess no one has done the steering on the Tiger before (factories are famous for being stingy on grease when manufacturing bikes).

The bearings still had some grease on them (the brown/grey stuff is grease), but not much.  No one's been in there recently:

... once I cleaned it up the bearings were in good shape and turned freely:

... even the tube that holds the steering column is nice and rust free.  After a good cleanup I reassembled everything with a liberal greasing using the Mobil HP222 stuff Triumph suggests.

That Mobil XHP 222 grease is what Triumph recommends.  I found it on Amazon.

Here are some torque settings for a 955i Triumph Tiger's steering system:

Triumph Tiger 955i Steering Torque Settings:

• Steering Stem Nut:  65Nm (50 ft/lbs)
• Fork clamp bolts (top yoke):  20Nm (14.75 ft/lbs)
• Handlebar clamp bolts:  26Nm (19.2 ft/lbs)

note: there is no torque setting on the two nuts that lock together under the handlebar.  The directions I'm following say to hand tighten the top nut, then tighten it down a bit more to seat the bearings, then back it off a touch.  You then lock the second nut to the first.  The idea is to seat the bearings and keep everything a set distance apart so the bearings spin freely. Making them too tight will make for stiff steering and will wear your bearings out sooner.

Some other points of interest are these bolts that hold the horn and front brake lines onto the triple tree.  They're a bugger to take off and were another part that needed some heat to get moving.

The other complication that I should probably look at as a benefit is discovering worn wiring and cabling.  The back of the clutch cable and the ignition wiring are both wearing through and would have ended up causing annoying problems down the line, but I can resolve them as part of this maintenance pretty easily.  I'm going to slip some heat shrink electrical cover over both breaks and heal them up before they become a problem.

Next steps will be to reinstall a shock to line up the triple tree with the top clamp and then do the fork oil.  Once the shocks are serviced, I'll put the whole shebang back together again and turn to the back end where I've got to work my way through a swingarm removal and rear suspension service before putting that all back together.  I hope that goes as well as this with all the parts still being serviceable.  Trying to get parts in during COVID19 isn't always a sure thing.

It's coming up on Xmas here, so if I can have all that done by the end of February I'll be in good shape for the coming riding season.

Other big-spa checklist items on the Tiger are:  a coolant change, new brake lines and brake fluid changes and another look at the fuel injection system to see if I can clean the injectors and balance them better.  My work in the summer solved the stalling issue, but the bike feels a bit sluggish, though that might be because it's being compared to a Fireblade.

An old bike that I run high mileage on it means lots of work to do while the snow falls outside.  In this winter of our Covid-discontent it's good to have a lot of things to do in the garage so I don't go cabin crazy.

Possible needed-things list:

Triumph's 'thin wrench' is a basic
thing that seems astonishingly
expensive for what it is.  DIY is
a possible alternative.

• A narrow angle adjustable wrench:  CT has one that goes up to 3 inches (76mm, so it'll handle the 38mm locking nut).  I'm hoping my narrow angle vice grip will hold the bottom nut while I tighten the top one.You'd need the Triumph special thin spanner tool T3880140 for adjusting it with the handlebars installed, but I'm hoping I can sort it out while I'm in there and not need it.  Paying $60 odd dollars for a bit of machined steel is a bit rich.  I suspect I could get our metal-shop teacher at work to fabricate me a couple of them for nothing (I fix his computers for him so it's a barter exchange).
• big enough electrical heat-shrink to cover the clutch cable rub through.  I think I have it and I don't want to use tape as it looks half assed.