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I have a T100 motor and a 500cc frame. Year of frame unknown. Finding parts for a 500cc model are hard to find. My question (and it's probably a dumb one) is can I fit T140 parts on the frame. Forks, fenders, tank wheels etc. without a major hassle? For a complete build.

Thanks, Jim

Not really.
A ton of work.
Although 500’s are maybe less common, there are tons of them in the USA

The parts you mention might be better sourced from unit 650 bikes, many are common to both or at least can more easily be adapted than T140 parts. The frame year can generally be determined by type, the later the better - does it have a top brace for example? early ones will have a H number on the left of the steering neck, later may have a raised pad there.

Jim,

What are the numbers on the frame? Can you post pictures?

Certain T140 parts can be fitted to a T100, but we have to narrow down the year of your frame before determining for sure what will fit/work and what will not.

Maybe you're close to 6th St specials. They may have a pile of what you need.
I bitsa'd a Frame/engine just like your description using all Bultaco Lobito parts. Minimal mods and a killer dirt bike

Each year here in CA there are always more 500 parts available at the swaps. Really anecdotal guess, I like to joke there are 2 500 parts for every 650 part.

Fitting T140 cycle parts isn't as hard as some say, but there are a few snags. The rear fender will need to be cut for the oil tank. No biggie, I've done it a few times. The rear fender brace may actually fit straight on.
The forks may pose a problem, as the T140 triple tree stem is slimmer and shorter. The best plan is to buy one from a Trident, which has the correct dimensions. I have actually modified a T120 OIF tree to fit a "dry" frame by extending the stem and crimping on a ring for the bottom bearing, which has a bigger ID (and OD) on the "dry" frames. Not hard to do if you have access to the tools or a machine shop. You need to make a spacer for the upper bearing as well.

SR

Thanks again for the information. I will check the frame number as soon as I can get to it. I have yet to make the purchase, but hopefully I can come to a purchase price. I might be awhile, but I will follow up on it.

Jim