Drop-in 279cc engine for the RX3?

[SpudRider]

Originally Posted by rtking

I don't think this big bore kit is meant for use with the ZS177 engine, unfortunately. Our bore is 77 mm, so to get to 300cc, you'd need to go with a 84mm overbore and a custom piston.

Originally Posted by Eco Mouse

Would it really matter what the new bore is vs. the old? When they are giving you a new sleeve, and piston to match? Obviously, if the bolt holes and water passages don't line up, that's an issue.

Would this make it more of a stroker? Maybe what's missing is a longer connecting rod?

RT is correct. This cylinder is not part of a big bore kit for the ZS177MM (NC250) engine. The bolt holes, lubrication journals, and water journals do not line up. This kit is designed for a 250cc ATV engine. I don't know of any big bore kit for the RX3 engine.

Here is a photograph of the ATV, big bore cylinder.



Here is a photograph of the RX3 cylinder.



The RX3 cylinder photo was taken from the following thread.

http://www.chinariders.net/showthread.php?t=15591