Hi Carl

Cost of re-bore was US$60, but my dealer had old stock pistons and the head work was done in-house. I've been dealing with the guys at TT for over 30 years and my bike is the unofficial tester for all mods, so they charged me a nominal $20 for all the labour. I suppose a normal charge would have been somewhere around $300, depending on piston cost. Certainly worth it so far - I'll tell you more after next weekend's 1200kms.

ArcticMonster - the Jialing is a copy of a Honda CB250 motor so a parallel twin. If yours is a twin then the same thing should work. The same principle applies to a single, of course, but you'd have to find a compatible piston.

If your bike seems to be revving its guts out at 85kmh, you need to try replacing the front drive-chain sprocket with one a tooth larger, if possible. If a larger sprocket won't fit (as on the Jialing), fit a smaller sprocket to the rear wheel.

Have Fun