largest bore kit for a 125?

[Nevada Sixx]

hi,
whats the largest bore kit or cylinder kit that you have seen for a new 125? anyone making a 175 kit?
thanks.

 

[gonzo843]

Start with a good port job and work from there. I just had my 125 done and it's incredible. Also it's alot cheaper. A bore that size will cost you big time. I dont think you can bore a 125 to a 175. The biggest I've seen is a 167 and it's 1900 bucks.

http://www.maxpower-engines.com/big-bore-kits/yz167.htm

 

[elf]

There is a guy at Munn racing in Texas,whos name is Clay, that has been making some 170cc ktm 125s. There using a 125 crank with a 200 rod and cylinder. They call it a 170 but the actual displacment is closer to 175cc.
If your just talking bore( and not stroke) the biggest is the 58mm piston or 144.

 

[NacNac250F]

try www.rpmbigbore.com they have some big bore kits and their pretty good.

 

[Senior KX Rider]

The 144 kit makes a big difference in power :cool: