Rings and Carburetors: Swimming Upstream on this Vintage Motorcycle Restoration Project

The never ending winter drones on up here, so I'm putting my back into getting the '71 Triumph Bonneville project closer to a state of mobility.

I have a new 750cc head and pistons on hand, so I gave the piston rings a go. Installing them is pretty straightforward and the first set went in no problem, but as I was compressing the second set into the cylinder sleeve it didn't feel right, so I backed everything out and the bottom ring came out in pieces. I can only think it was already compromised in the package.

I sent Britcycle an email and they looked through the warehouse to see if they had any extras laying around, but I was out of luck, so it's a $100 failure (new rings, taxes, shipping). Ouch. This got me looking at costs for this vintage project. The last one I did was the Fireblade. Those are my favourite kinds of restorations. Parts are easy to find and relatively inexpensive, the bike is rideable fairly quickly and, after riding it for a season, I can turn it over for at least what I put into it (or with a small profit as was the case with the Fireblade).

New cylinder heads and cylinders... and broken ring.

 

I think I'm still right way up on the Bonneville simply because these older bikes seem to work under their own economy. I was looking up prices of what I've got on eBay this evening and the frickin owners manual that Bryan threw in at the last minute is $50US! A used top end is $500US (and Bryan gave me 2 of the things!). I imagine I could double my money just parting it all out, though dealing with people doing that would be a giant pain in the ass - at least it has been with the newer bike crowd, maybe the vintage types are less adversarial.

I had a couple of choices when I was considering going old school, and I think I picked the hardest possible one to bring back to life. The technical side of it doesn't bother me, but with costs increasing all around I'm bothered more about the high prices and difficulty finding and shipping parts than I am with what I've got to do to bring it back. That old BSA would have probably been a better choice for my first vintage resto, but it (and alas, Bryan) are long gone.

I've got what I've got, and I've got a lot of it, and I'm crafty. I'll see what I can do about replacing fasteners and the other bits and pieces I'm missing without it breaking the bank, those these strange old British pre-metric fasteners are a story unto themselves. The goal right now is to rebuild the bike to an operational state and then maybe ride it for a bit before putting it up for sale. I still need a seat and exhausts and I'll need other odds and ends like control cables. If I can get it back to a state of play, I think I can cover costs and move it along, then I'm thinking I'll go back to my favourite hunting grounds: forgotten bikes from the 80s, 90s and 00s that I can turn over for next to nothing while giving me a chance to ride something different for a little while.

When the ring crumbled on me I changed gears and rebuilt the Amal carbs. That went well, but I'm missing two of the bolts to put the second carb back together - they weren't on it when I wiped the mud and rust away. It's these little setbacks that stall things, and it's not like I can grab a couple of replacements out of my big tray of bolts (most of which are metric).

 

How simple can you make a carburettor? These old Amals are pretty close to first principles. The combination of archaeology and simple mechanics is very appealing when everything else I ride carries a computer and my day job is all about them - it's nice to be fully analog!

I'd broken down the carbs in the fall and left them packaged in a segmented toolbox. Putting them back together was problem free and the kits I got from Britcycle replaced all the gaskets and rubber grommets in them. The old rubber bits were really showing their age.

Guess which one is the 50 year old ring (I;m assuming they're original)?

Just need some bolts (at $3.50US a pop)

If money and time were no object I'd dig deeper into this vintage resto thing - I dig the mechanical simplicity and I enjoy seeing how mechanical evolution happens over time. As a hobby in retirement, it has great appeal, but I'm some years away from that much free time on my hands.

I'll see this one through and then refocus on the SPQR-WRO (small profit, quick return - with riding opportunities) side of it where the costs and time commitments aren't quite so demanding.

 

 

 

650cc Air Cooled Triumph Bonneville Exhaust and Seat Options

More 1971 Triumph Bonneville restoration project research (all prices courtesy of BritCycle):

High pipes:

721-T74X exhaust pipes - $304.51/pair.
711-709669/9670 mufflers - $486.00/pair.
2x 742-158 clamps - $16.61 ea.
70-9673 “H” connector - $72.28.
2x 742-112 clamps - $16.61 ea.

TOTAL:  $930

Plus associated bracketry and hardware, etc if needed. The one item we’ll have difficulty sourcing will be the ‘chip basket’ heatshield; our manufacturer of those long since retired.

Looking like Steve McQueen on a scrambler styled Bonneville costs extra!  Britcycle said they might have some scratched and dented options on sale, but those aren't regular stock (obviously).

Stock(ish) exhaust system:

721-T79 exhaust pipes - $289.02/pair.

712-102 Dunstall decibel replica mufflers - $330.32/pair.
70-9888 balance tube - $29.09.
2x 742-138 clamps - $16.61 ea.

TOTAL:  $683

What I'd really like to do is form my own pipes, but I don't have the space, equipment or time to do that.  For this project I think I'll use it as a learning process and get this particular Bonneville cleaned up and mechanically sorted and leave the radical customizations to a future time when I'm loaded, have lots of free time and a much bigger workshop with a full range of tooling in it.

I think stock is the way I'll go on exhausts...

As far as seats go, BritCycle has just the sort of thing I'm looking for: 

  

Custom Seat, 71on T120, Clip Type

Part Number 513-05

The only thing that might knock it out of contention is if, price and fit-wise, Corbin's customizable seat is in the ballpark.  It says they might fit a '71 but they're mainly for '72 Triumph twins and up.

Quality (made in England) newly manufactured seats specific to the oil in frame 650 twins run at about $500US ($612CAD) - I'm not sure what Britcycle's go for.  The customizable (and probably higher quality) Corbin is $618US ($788CAD).  There are cheaper options manufactured in India & China to less exacting standards to consider too.  I'll be keeping that all in mind as I juggle seat options and make a decision.

The Stable

My dream garage always had to be kind of huge to fit all the cars I wanted in it.  With the new bike
infatuation I get to dream of a more condensed (and plausible) dream garage.  It's still got room for the necessary evil (I live in Canada, some days a bike just won't do it), so I took the two car garage and doubled it to make a workshop in the back.

The car garage is separated by a dividing wall with a single garage door in it to allow larger vehicle access into the workshop.  There is a half size roll up door on the side for direct bike access.  The garage is wired in, but also has a turbine and solar collection.  In the winter this runs the high efficiency heater in the workshop.  In the summer is pushes a small, high efficiency air conditioner into the workshop.  The goal is to keep the workshop above freezing in the winter and below 25 degrees in the summer.

The battery packs and computer controls for the wind turbine and solar inputs are upstairs, as are the heating and cooling units, both of which feed into the workshop directly.  There is also room for storage upstairs.  Access is made through a pull down staircase in the back of the car garage.

The workshop has space for 5-6 bikes, though I think I'd keep 3 working bikes on hand, and one project bike.  I'd also keep a shed at the side for a couple of dirt bikes.

As for what I'd fill the workshop with, at the moment I'm all about the British bike.  A Triumph Street Triple, a Royal Enfield Classic with a sidecar and a Triumph Tiger 800XC would be what I'd have on had to regularly ride.  The other side of the shop has the half car/half bike Morgan3 Trike.

Royal Enfield Classic with sidecar

Triumph Tiger 800XC

The Tiger is a great all rounder that can get you anywhere.  A nimble adventure bike that also loves to carve up roads, this'd be my go to for long rides.

The Royal Enfield Classic with sidecar is a classic with modern technology.  It would let me share the open road with my son in a way he'd truly dig.

Triumph Street Triple

Morgan 3 Wheeler

The Triumph Street Triple is a naked bike built for the road.  It's fast, responsive and sounds wonderful.  This would be my dedicated road bike.

What I don't show in the plan is the project bike.  This would change quite frequently, depending on how much work the bike needs.  At the moment I think I'd like to bring an '80s Honda Interceptor back from the dead.

Honda VFR 750 Interceptor

The idea behind the dream garage is to have a workshop for bike maintenance and restoration.  I've really enjoyed restoring the 650r Ninja I've got now, and I'd like to keep doing that kind of work.  To that end I think I'd include a bike sized bench style spray booth, as well as a compressor in the workshop.  I enjoy both mechanical as well as body work, and it would be nice to have the space and tools to do both well.

Trials Riding Wishlist

Trials Riding Wishlist

Trials Helmet in Gulf colours:  $76

Trials helmets are specialists.  They aren't designed for highspeed riding because trials bikes generally don't do high speed riding, but they are designed to let you breath freely while offering you maximum vision, especially down as you're picking your way over obstacles.

I'm a child of the 70's and the Gulf colours take me back to the mighty Ford GT40 race car dominating Le Mans.  A good design article on this colour scheme is here.

'94 Fantic 250cc Trials Bike   $2500

This lovely thing has been up for sale on Kijiji for some time.  He's asking $2700 but I suspect I could talk him down a few hundred.

I'd actually prefer a basket case I could completely rebuild (and then paint in Gulf livery) but trials bikes are vanishingly rare and (like dirt bikes) strangely expensive.  Maybe something better will come up that lets me do a full engine rebuild and restoration.

'01 GasGas TXT200 Trials Bike  $3000

This one's a step closer to a project bike but newer and more expensive. It needs brake work and fork seals. The photos are terrible and it looks like it's been well used, but being newer it'll perform better than the 80's tech in the Fantic.

As a project this one isn't a complete rebuild but it does need some TLC.

There ain't no such thing as a cheap off roader.  This beaten up old things costs almost as much as a brand new Chinese trails bike so it doesn't make much sense.

The Amateur Trials Association of Ontario

The ATA runs regular events throughout the riding season in Ontario.  They have an active Facebook group and seem very keen to welcome new members.

They have Tenaci-Wong TWA150A 150cc new trials bikes for about $3500+ PDI/shipping/taxes on the FB group.  That means a new adult sized trials bike is about four grand plus a few hundred more, which suddenly makes the abused and ancient things above seem like a bad idea.

The end of May event got pushed back thanks to Doug's on-again-off-again Ontario lockdown policy, but they're hoping to re-insert it into the end of June.

The ATA?ECTA schedule runs from the end of May to mid-October and offers a busy August of events.  If I'm looking for a relatively inexpensive way to combine competitive sport with motorcycling, this might be the thing.  I'm terrible at exercising just for the sake of it but given a  reason to work out, I do.  This might be just the thing to get my chasing fitness again.

A new Tanaci-Wong 150cc trials bike and competing in the ATA/ECTA events wouldn't cost much more than new hockey equipment and a season of beer league, and it would let me improve my bike riding skills.  I also happen to have a backyard built for trials practice.

This one's on the to-do list.

The Norfolk Motorcycle Museum

We drove past the entrance twice.  Finally, up a gravel drive we found the entrance to the Norfolk Motorcycle Museum.  This was an impromtu stop between various tourist related day trips.  I'd seen the sign and wanted to go for a wander.  No one else wanted to come in with me, so they stayed in the rental car while I wandered into a warehouse full of bikes.

One of the things you notice in England is just how divergent the technology is, and this museum was no different.  The bikes were odd, different, not a cruiser in sight, no Harleys.  It was decidedly un-North American.

Many of them I couldn't identify at all, some were so old as to be virtually steam powered.  You know you're far from the familiar when you don't even recognize some of the manufacturers.

The building was a working restoration shop with a big warehouse space behind.  Bikes in various states of repair were lined up at the entrance, the finished machines were perched up on a two layer rack that ran through the whole warehouse.

You can poke around the bikes and the father/son duo who run the museum are happy to talk about any of the examples on display.

I had to rush the walkabout because the family was waiting outside, it would have been nice to wander around for an hour taking some good closeups.

If you're ever in the vicinity of North Walsham in Norfolk, England, drop by the museum.  It's a strange trip down someone else's memory lane.

Like what you see?  Many of the restorations are available to buy.

Mainly British bikes, but some others can be found
in the rows

A mighty Vincent!

"Made in England" - getting harder and harder
to find made in not the far East any more

Many parts in the process of being cleaned up...