- Wed Sep 06, 2017 4:44 pm
#70605
Taking on someone else's cocked-up project isn't for everyone, it depends on how badly bodged things are. Provided the frame hasn't been hacked around and the whole plot is capable of being fairly economically restored it could be an option. Meanwhile a reasonable-looking 535 Lightning (I say reasonable, it's still pretty ugly in factory trim!) up in Cumbria went for a mere £800-and-something very recently on ebay, if you don't mind getting one from a more remote location a reduced price could still be worth it, even after paying for the bike to be shipped down. Mind you, there's all the more reason for you to turn your ugly duckling back into a swan.
I too am a little perplexed by the unsuitability of the cases, could not the webbing be reinforced (the sort of thing they used to do in vintage racing), and the flywheel housing be skimmed out? AFAIK the metric crank 350s and 500s use the same bearings, and both Tollgate and Henry Price offer a conversion to fit a bigger timing side main bearing to beef things up a bit (my 500 Redditch/AVL hybrid based on a set of modified 350 crankcases has this). I would be interested if Tim NZ could tell us a bit more about why your cases are a No Go.
Your heart may be set on a 612 but don't forget there are some quite impressive 500 and 535 Bullets out there, Bullet Whisperer who recently posted has built some very competent 500 Bullet race bikes as well as his ASBO Bullets tuned for road use, you could also see what Tom Lyons has done in the US with his Fireball 535 Bullet conversions. One of his customers had a Big Head 500 Bullet in 612 trim, but when he put it back to the original 90mm stroke and ran it as a 535 he found it was a nicer bike to ride, and still no slouch. The tuned 500/535 route would let you keep your existing crankcases and, if done right, still give you a fast (by Bullet standards) engine at the end of the day.
A.