Has anyone every bored out the cylinder and used oversized rings?

NickDK · #1 09-23-2009, 02:59 AM

Anyone done this to one of our two strokes?

NickDK · #2 09-23-2009, 03:54 AM

And yes, I know to do so is foolish.

azbill · #3 09-23-2009, 09:30 AM

most 2 stroke engines have a thin nikasil plating on the cylinder wall...not much you can bore there

some of the new grubees have a steel cylinder liner,,,a much better prospect for boring

**Bikeguy Joe** · #4 09-23-2009, 10:05 AM

These engines are not bore-able, except as azbill mentioned some of the 50cc engines being sold have a steel liner....but then why not just buy a 70cc if you want a bigger engine?

xlite · #5 09-24-2009, 07:11 PM

Steel lined (I have one) or not, there is nothing to bore. Cylinders perform poorly when constructed of aluminum foil.

camlifter · #6 09-24-2009, 07:29 PM

if you bored it over and reused the stock piston it would be to loose and probably get a lot of piston knock no mater what size rings you used. the bore must be sized for the piston, not the rings. the rings will be gaped so many .00's per inch of bore.

Foximus · #7 09-28-2009, 01:38 AM

If these cylinders are nikasil (which is ****in awesome) then you can bore your cylinder and send it off to be replated. Problem is then finding oversized pistons.

xlite · #8 09-28-2009, 08:44 AM

It appears those who are enthusiastic about re-boring never bothered to measure HT cyclinder wall thickness.

azbill · #9 09-28-2009, 09:51 AM

**Bikeguy Joe** · #10 09-28-2009, 05:19 PM

Fo'sho'...