https://www.arboristsite.com/threads/346xp-cylinder-kit.222221/To summarize, I believe the original 346xp was 45cc & ran a 42mm piston (OE). Mid 2007 it became a 49cc saw running a 44.3mm piston (NE).HL supply has them listed as new addition. Any idea what that means and do I have to do any changes at the intake or carburetor?
Thanks. Jason.
There are also 45mm kits sold "for them" but these are really 350/353 kits.
For best performance you want an OEM 44.3mm (NE) kit.
Be sure to replace the clamp on the inlet manifold with the updated metal one, & do a pressure/vac test as some can be a bugger to get to seal.