Generic parts interchange data, where to find?

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04 Dec 2005 04:10 #11665 by Duck
A guy I knew in Fiji back in the 70's had lived for a while in Malawi and had to scrounge parts. He used piston and rings from, IIRC a Buick in his BSA.

Well I'm wondering if anyone has turned up a source for dimensions on engine parts. I have a specific problem, but the data could be useful, especially to folks who are living where parts are hard/impossible to get.

In my case, I acquired a 500CC Honda Thumper engine that's been bored out to 0.080" over. The sleeve looks like it's got enough thickness left but the largest oversize piston available is a 0.060 over. I suspect rings will be pretty easy to find but am havibg a heck of a time locating a substitute piston.

On a related note, has anyone found a real good deal on a shop that does hardwelding? I need to resurface the cam followers too and $65/each x 4 s just not practical on an old bike like this. I can do my own grinding with the surface grinder and a rotary table but can't seem to find anyone who will touch the small rocker arms for hard welding. The automotive machine shops will do a big old camshaft but seem timid to try smething so small.

Also related, how difficult is it to resleeve a cylinder. Maybe I should ask, what's the procedure. It's you typical air cooled Al cylinder.

-Duck

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04 Dec 2005 07:05 #11673 by b200driver
Replied by b200driver on topic Generic parts interchange data, where to find?
Duck,

Go to www.thumperpage.com/ They should be able to help you with the honda 500 stuff. Most of those big honda singles use interchangeable parts. A few years back, we built a customers GB500 to nearly 700cc using a combination of XL/XR 500, 600, and 650 parts in a GB500 engine. Whit Bros is a good source for what fits what on those too. Good Luck

Tim

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06 Dec 2005 15:03 #12066 by MDawnz1
Hardwelding,,I haven't heard of that for awhile, If you have a welding/trade school around ? Maybe for free ? If you can do the machine work to finish them.
For the cylinder liners (steel liner/aluminium block)you can do that at home in your oven....but it stinks up the place :(

1974 Z1a, still 903

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06 Dec 2005 18:33 #12095 by BSKZ650
if you can locate some spray metal people that would be the best way to build up the cams, the problem then is to get them ground back to specs, you will need to find a good cam grinder to do that job

77 kz650, owned for over 25 years
77 ltd1000, current rider
76 kz900, just waiting
73 z1,, gonna restore this one
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07 Dec 2005 05:08 #12129 by Duck
Thanks.

Cam shaft is missing. I'm scrounging for one from a XL500.
The rockers have pretty thin hardening and it's starting to wear through. These, I can grind.

I have an electric oven in the workshop. Will see if I can get the liner out. Never tried or seen done. Hence my qestions.

-Duck

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07 Dec 2005 05:42 #12133 by wiredgeorge
Replied by wiredgeorge on topic Generic parts interchange data, where to find?
Look up LA Sleeve on the web. They may be able to help with the liner (piston sleeve). They are the biggest source of aftermarket sleeves I know of and may be able to offer some advice as well. You might want to shoot an email to APE Jay as some of these problems are beyond what is normally being done by a shop due to the restore nature of your project.

wiredgeorge Motorcycle Carburetors
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