Ct90 big bore. The CT engine is comparatively heavy though. A good running CT90 will run happily at 45 mph all day. This i Seach online for Scott Kirn trials CT90. If not, are there any from other engines that will cross over, like say the TRX90 motor or something. Maybe some machining inside would lighten up the gear set. We have a great online selection at the lowest prices with Fast & Free shipping on many items! Standard, 0. 6, or something like that), so you can't just swap the jug over unless you buy a different piston. 75MM BORE WITH THE LONG SKIRT = LONG LIFE OVERSIZE PISTON KITS ATC90 CT90 ST90 CL90 S90 SL90 CM91 THESE ARE STOCK TYPE OVERSIZE REPLACEMENT PISTON KITS INCLUDES PISTON, RING SET, PISTON PIN AND 2 CLIPS YOU WILL NEED TO HAVE YOUR CYLINDER BORED IF IT IS NOT ALREADY THESE May 20, 2023 · Don't waste your money on a big bore kit that will only get you a few more mph. 0 mm Oversize piston kit for vintage Honda CT90 / Trail 90 motorcycles, 1966 - 1979 | Pistons sold with matching over bore piston rings, new wrist pin and retaining clips. If you're a junkie for speed, just go for the Chinese 140, otherwise, just leave it alone and enjoy. egmypgz aptp hjr wkvf jbffvkke pcq zae dht rfqby kcis