pit pro gpx 140cc to 160cc

[PETERRR]

hi, i got a knocking sound coming from my pit pro 140cc so pulled the engine apart - while it's apart thought may as well upgrade the bore to 160cc.

my question is what parts do i need to actually need to do this? and will there be a noticibly difference power wise?

i'm fairly new to pit bikes so any advise would be great.


cheers.

 

[sean01]

in the 140 you need a 59mm bore to give you 155cc or 60mm bore to give 161cc..but.. problem going that big is the head gasket ends up being really really thin next to the barrel studs..
also you need strip the engine completely and bore the cases to fit the over sized bore..

you will also want to look at modifying the clutch to handle the extra torque.

just buy a new z160ho for it

 

[PETERRR]

thanks, i've being looking on ebay and they sell the 160cc bore new, also the 160cc piston fairly cheap - would this work? are are they any good to buy?

also would a thicker headgasket fix the headgasket problem stated above?

 

[sean01]

no a thicker gasket wont make it more reliable..

as for these bore kits, best you put links to them here cause we dont know what your looking at but at a guess your looking at klx style 160 bore that wont fit