cylinder boring??

[chamberlain31c]

how much can you bore a stock cylinder and still be safe?

[1promodfan]

I have a '89 cylinder and I asked the same question this past weekend to Neil at C-Leigh Racing. He said you can go up to a .140 over which would be a 69.5mm piston. I'm pretty sure you'll get a couple of different answers, (especially by a certain someone), I'm just going on what I was told.

[chamberlain31c]

well i had planned on going about 68mm so i should b good

[morse250r]

depending on the year cylinder youll have to run a spacer plate 86 cylinders nad or pistons went to 140 or 160 over 88/89 only went to 80 over

[C-LEIGH RACING]

You know whats realy trick.
Say you got this guy out running people bad with a stock TRX jug, nobody can figure out what hes got & everybodys thinking its a big bore, but, he says its not & then one day he opens it up & low & behold its a 71.95mm piston & that jugs never been re-sleeved to a big bore sleeve.
Its not a legal big bore untill the big bore sleeve has been installed, its just an over bore.
Neil