Triumph Tiger 955i Valve Clearance Check

I just measured the valve clearances on the Tiger.  They're supposed to be checked every 20,000kms, I've put 27k on it since I've had it and who knows when they were done previously, so this was well past due.

Getting to the valves isn't that problematic since I've gotten gas tank removals down to under 10 minutes while I try and trace down this frustrating inability to idle.  Here are the numbers:

Cylinder             Intake                     Exhaust
      1         .13mm & .10mm       .20mm & .23mm
      2         .13mm & .10mm       .20mm & .20mm
      3         .13mm & .10mm       .20mm & .23mm

Intakes are supposed to be 0.10-0.15mm, so they're all within spec.  Exhausts are supposed to be gapped at  0.15 to 0.20mm, so a couple are on the cusp, though they're a tight 0.23mm (you have to push the spacer in there like you mean it - the .2mm is still snug, just not as).

Turning the engine with the rear wheel in top gear was pretty easy - don't grab the spokes, use the tire, you get more torque and it turns pretty easily.  As you turn the back wheel you get the cams pointing up, which is when you check clearances by sliding a feeler gauge under the cam and above the shim.

This Spurtar 32 blade feeler gauge from Amazon is a nicely made thing that offered me a full range of tapered ends that covered what I needed for checking valve clearances on this 955i Triumph Tiger. 

With the Tiger's timing pretty much to spec valve clearance wise, it suggests that my intermittent stalling problem isn't related to valve clearances.  Working on older bikes (and watching Car S.O.S.) has me well aware of what fails on older vehicles:  RUBBER!  Perished rubbers are Tim's go-to in Car S.O.S. when it comes to restoring an old vehicle - this Tim is thinking that's the issue with this 17 year old Tiger too.

I spent today putting things back together and double checking everything.  The vacuum system that feeds the idle control wasn't plugged in 1-2-3 (I had it 1-3-2).  That's something stupid enough that it might be the culprit.  At this point I don't care what it is, I just want the bike to idle to the point where I can depend on it to not stall on me and leave me hanging.

If I get it all back together and find that I'm still stuck with an intermittent stall I'm going to start systemically replacing all the rubbers in it.  Doing a deep cleaning on the fuel injectors is an idea too.  I ran into an old guy at Canadian Tire who swore by Sea Foam for cleaning fuel systems, so I got a can.  I've got some in the Tiger tank for the rebuild which will hopefully be done by tomorrow.  In a perfect world the Tiger will be back to normal and I can go after the valves in the winter if I'm so inclined.  If it's still stalling out on me, It'll be a perished rubber hunt next.

I'm already on it, replacing things as I find them...

It seemed like an extraneous expense when I got this set from our local NAPA auto parts shop, but having o-ring replacements at hand saves a lot of waiting.

A very shiny valve cover going back together again.  10Nm is all you tighten the valve cover down to.

Replacing the o-rings at the fuel inputs (I replaced the original terrible plastic ones with these aeronautically sound stainless steel ones shortly after getting the Tiger). 

I was hoping to get it all together, but I'm fabricating rubber grommets and trying to look into details as I go, so this is as far as I got in the 35°C heat.

Triumph 955i Stalling Issues Part 3, between a rock and a hard place

This started in June with intermittent stalling.  I've done all the obvious things like spark plugs, fuel and air filters, but the problem persisted intermittently, so I had another go at it in July.  The Tiger has been my go-to ride for over four years now.  I've put over twenty-seven thousand kilometres on it, and up until this year it's been as dependable as a sunrise.

This week I chased down some other possible electrical issues.  The ECU was covered in muck so I cleaned it up and sealed the plastic underbody around it so it won't get mucky again any time soon.  I then found out how to test the ECU relay under the seat:

That's the main how-to test Triumph 955i relays video, here are the two follow up videos: https://www.youtube.com/watch?v=TwkhX461GjM   https://www.youtube.com/watch?v=cDmh7FdpDDQ

Everything else is sorted on the bike, so I'm down to the valves, which I really should have done in the winter.  I'm now between a rock and a hard place since I'm not sure I'm hanging on to the Tiger and it takes weird, old 25mm over bucket shims that Japanese bikes haven't used since the '80s.  Modern bikes use much smaller under bucket shims.   My nearest dealer is far away and dropping off the bike there would be a real hassle, so I'm looking at getting the Triumph valve shim removal tool T3880012.  But you don't need that if you're willing to remove the cams, so now I'm elbow deep into pulling most of the top end out if I want to avoid getting a special tool for a bike I'm selling on. 

On the other hand, one of the reasons I got into bikes was to get back into mechanics, and any self respecting rider should know how to do valves, so I'm kinda keen to do the job since I haven't done it yet.  I'm just shying away from sidelining my long distance motorbike in the middle of a too-short Canadian riding season while I wait for COVID crippled parts delivery on a 17 year old European bike.  The valves need doing anyway, but doing them might still not sort out the stalling issue, which would be very aggravating.

If I can move the Honda on I'd get the C14 Concours I've been eyeing and then the Tiger could take as much spa time as it needed.  I just had the Honda up for a few days in the four thousands, which is high for what it is, and only got an offer for a trade.  I'm going to put it up this week in the threes and see if it goes, then I can do some shuffling and take the weight of expectations off the old Tiger.

Motorcycle Valve Adjustment Research:

Good primer on valve clearance from Revzilla:  https://www.revzilla.com/common-tread/why-do-bikes-use-shim-under-bucket-valve-adjusters

Why higher revving bike engines have bikes have solid rather than hydraulic valve lifters that need adjusting (cars and Harleys rev less and so use hydraulic/self adjusting valve lifters:  https://www.quora.com/Why-do-motorcycles-require-valve-adjustments-when-automobiles-dont-require-them

https://www.bikesrepublic.com/featured/checking-bikes-valve-clearance-important/
Why checking your valve adjustment is important.

Triumph 955i specific valve clearance primer:  https://www.canyonchasers.net/2006/02/triumph-t955i-valve-adjustment-tips-tricks/

Local advice on how hard it is to find 25mm shims for the Triumph 955i engine: https://www.gtamotorcycle.com/xf/threads/help-looking-for-25mm-valve-shims.201738/

Some 955i engines are under bucket shims, the Tiger has over bucket shims (which is why the tool is needed if you don't want to remove the cam):  https://www.triumphrat.net/threads/05-955i-valve-shims.6986/

Good advice on when to do your valve clearances (when you stop hearing the valves 'rustle'): https://www.mikesxs.net/25mm-valve-shims-sizes-2-30-to-3-10-honda-yamaha-triumph.html

Shim sizing on 955i Triumphs (25mm over bucket shims are hard to find!):  https://www.triumphrat.net/threads/2000-955i-shim-diameter.230758/


BikeBandit has the tool (1-2 week wait, and a 25mm shim set for $335US/$455CAD because even though the US is making a mess of COVID19, their currency seems to be immune to their poor management.

At this point I'm stuck between over four hundred bucks in tools, parts and the opportunity to do my first valve adjustment and whatever Inglis Cycle gets back to me with costs wise - though that'll also include having to get it over 140kms down there and get it back again on another day.  If they get back to me with a price north of $600 and a long delay in getting it done, I'll be going after the tools to DIY it, though I don't want to go crazy with a fancy set of 25mm shims when most modern bikes don't seem to use these big over bucket shims any more.

I'd go with Fortnine, but for some reason they're selling the identical shim kit to BikeBandit ($179US/$243CAD) for $278CAD. 

If I can move the Honda, I could get the C14 Concours and then have time to work on the Tiger without depending on it as my main long distance tool.  On the other hand, selling the Honda means I've just sold the only bike that's working right at the moment.  The Tiger picked a bad time during the summer of COVID to tighten up on me, though I'm well past when the valves should have been checked so I only really have myself to blame.