What do they mean when a person says to bore it out .60 over? How much will the displacement change? What I mean is how much power will it gain and how much will it cost?

 

.060 is 60 thousanths of an inch 60/1000. .060=1.5mm. The stock bore of the 85 is 70mm, so .060 over would be 71.5mm. The total displacement will be in the area of 260cc. You may feel a little power increase, but more due to the fact that the engine just got a fresh top end job. Figure the whole job cost around 150-200 dollars, dependng on where you get you parts. A bore and hone job is only around $50, but the piston and gasket kit is $90-$150. I found a complete top end kit on Ebay for 490. It included Wiseco ppiston, gaskets and the bearing.

 

i thought like .60 over was .60 of 1 mm?

like those little peices of lead for mechanical pencils that are .05 mm.. i tohught 12 of those would be .60 mm

lol that was my guess

 

No, .060 is in inches .020"=.5mm 1inch=25.4mm
If you have ever taken a machining class, then you would know.

 

lol that makes sense
thanks

 

Also, if you got a pencil with .05 lead, careful, you'll cut yourself. I think you meant to say that it has .5mm lead.

 

damn you got me again..[img]i/expressions/face-icon-small-blush.gif[/img]

 

my cylinder is 261cc's and its .60 over with a wiseco. over all i think it adds a fait bit of power. i cant wait to see what .80 over does to it, but im guessing it wont last too long.
scott

 

Nah man you dont want to go there until you have.. but i tell you what i have an 86 totally rebuilt. but before i rebuilt it my sis bf locked it up goin down the road on it... ran just fine after that... then when i went to rebuild it the cylinder and piston was perfect. i was very shocked... but now i got mine back to the stock bore... believe it or not i have had it clocked close to 90 mph... these quads are the $h!t !!!

 

Definately do not bore a motor unless you need to. The gains are not worth the problems