Some of the results of the holidays - 78 SR500 Street/tracker progress

Glad you got your project restarted. I looked at the photos and they took me right back to 1977 when we raced them pretty much as your bike is set up.
Ya those Duro tires look the part - I've got a pair on the baby tracker. When I got my set, I happened to have an old MT53 out in the garage so I compared them and ... they look like they could have come from the same tire moulds. I should see if I can make some Pirelli stencils up or something and do the sidewalls.
Love the silver on your frame too. You musta been lookin' in my garage when you chose it - almost the same colour as my frame LOL.
Great project bike. Keep up the good work.
Regards,
Pat Cowan,
Vintage Motorcycle Fiberglass
 
Tim said:
Good info. Those true tracker tires are tough to find and pricey when you do find them. Any reason you're sticking to the inch sizing? I did the same on my BMW - just installed new Avon Roadriders partly because they were available in the 3.25/19 and 4.00/18 sizes I wanted - makes a difference in handling on the Airheads, and the Michelin Macadam's I used to use have been discontinued.

The K180s are still sold in New Zealand, but I'm betting the shipping would kill me.
The reason for the inch sizes is because the tires listed were and are sold in the inch size format. Not metric. There are no old style "dirt track" tires in metrics. When I say "dirt track" you have to realize there were NO flat track tires made specifically for that purpose until around 1976 or so.

Up to that point the tires of preference were Dunlop K70s, Pirelli MT53s, and Carlisles (don't know the model). That was part of the problem in the mid 70s. The bikes were just overpowering the tires available. Ken Roberts, probably among some others, tried some different tires, specifically Goodyear road race rain tires in 18" on the TZ750 mile bike. The tread was almost identical to the Goodyear and Maxxis flat track tires of today.

So, to have an authentic dirt track tire pre-1977 or so, you have to go to something like the K70s or the Duros. Unless you're doing a 1950s and earlier version, then the authentic tire would be a Firestone clone - another street tire tread. The Firestones are popular on the brat bikes and stuff now. They'd be the trick on some "50s-40s dirt track look Harley for the authentic look.

Again, anyone who might consider the authentic look for the 60s-70s on a street/tracker, give Duro a yell and tell them to start selling the HF 308 in the 3.50-19, 3.50-18 and 4.00-18 sizes so you can put them on your CB350/450, Yamaha XS650/SR500, Kawasaki KZ400/750 or whatever else you may want to give that street/tracker look in your tires.
 
pacomotorstuff said:
Glad you got your project restarted. I looked at the photos and they took me right back to 1977 when we raced them pretty much as your bike is set up.
Ya those Duro tires look the part - I've got a pair on the baby tracker. When I got my set, I happened to have an old MT53 out in the garage so I compared them and ... they look like they could have come from the same tire moulds. I should see if I can make some Pirelli stencils up or something and do the sidewalls.
Love the silver on your frame too. You musta been lookin' in my garage when you chose it - almost the same colour as my frame LOL.
Great project bike. Keep up the good work.
Regards,
Pat Cowan,
Vintage Motorcycle Fiberglass

Us guys who ran Bultacos can only see a flat tracker (and about any other off roader) in a silver frame. I almost left it black, but my buddy who listened to my early leanings, made the comment that it really should be what I talked about earlier.

Not that you asked or commented, but an observation... I'm not going to try to get spoke wheels, the cast wheels suit me fine. I liked the look of it. The fuel tank will have the "Clem's Garage" on it with a distressed finish when I get done, kind of like my avitar, but on primer red. It is a bit of a tip of the helmet to my late father who put up with my dinking around in his garage over the past nearly 40 years. Fact is that is where the SR is being built right now... his garage.

I just picked up a set of repop Triumph T120 handlebars, they showed up today by Fed Ex. A bit costly at $46, but the right bend. My old K&N model 24s that were new 12 years ago now have some rust pits. I'm going to check into rechroming if sensible in cost or maybe silver powder coat again if sensible (masking the throttle end off so as to not bind the throttle tube. Regardless, the T120 low flat track bend will be there shortly. That was the first bend I had on my Sherpa S in 1972, borrowed from a friend. When I gave them back I put on a set of model 24s. Emgo repops both the T120 and the model 24.

I'm excited about getting back on the project next week - spring break in school. I'm thinking I'll have it on wheels with the engine in. Then comes the paint on the tank and the electrics for street legality.

Shoot me a link to your baby tracker so I can see what you're doing. Also, I'm taking it you're in Canada from what I could figure... can you get a Duro 3.50-19? We might have to talk if you can. In a side note, I do cam chain tensioners for Kawasakis, Hondas, and some Yamaha and Suzukis for about half what most sell them for. It has turned into a world wide thing, with my parts in 27 countries, most, if not all, Canadian Provinces, and most of the 50 U.S. states. Should you or someone you know needs one, give a yell.

Finally, sorry to bend your ear so much, I want to do a two stroke single. Either a Bultaco in a Sherpa S frame , Matador engine for longevity or a rotary valve Kawasaki with the carb and air filter hanging out on the right. Of course that's after the SR for sure.
 
Back in the garage this next week for a few days during spring break. I have the tires and tire irons, new handlebars and hardware, along with some other stuff in the car for the bike. Pictures to come...
 
Getting closer...

the lump of coal...

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the hearth...

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Now that's an old school dirt track tire tread, front and rear...

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Trials bike like profile...

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making progress...

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No foam in the seat, hard to find actual seat quality foam. A set of nearly new WP shocks I came across are on the way. Those old Yammie shocks will be sold off to offset some cost.

Finish paint work and wiring, get some seat foam, and bolt it together...

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I can almost remember goofing around on the SR on the back roads pre-KLX650. It is hard to wait and anticipate sliding the back wheel again... by May I want it done.
 
For seat foam, one option is always to find a cheap ripped up old seat and harvest the foam out of it. Good for the environment too :)
 
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