To bore or get new block

[btomlins]

I have one cylinder that is pretty scored. How do I know if it's beyond repair of boring? It s a 1995 90HP v4 crossflow.

 

[bonz_d]

Re: To bore or get new block

I think the largest oversize pistons are .030. But if it's deeper than that I'd scrap it. Take it to a machine shop and have them check it.

 

[emdsapmgr]

Re: To bore or get new block

Bombardier makes a factory .040 over piston assy (with rings). P/N 5006704. If you go with these, you may want to consider increasing the main jet size to compensate.

 

[Chinewalker]

Re: To bore or get new block

You can get aftermarket pistons as big as .064 over...

 

[Faztbullet]

Re: To bore or get new block

You dont wont to go over .040 as sleeve gets to thin....

 

[emdsapmgr]

Re: To bore or get new block

If you bore the bad cylinder to accommodate a larger than stock piston, (over .040,) you need to replace the other 3 at the same time so that they are all from the same manufacturer. (Don't mix pistons from two manufacturers in the same block.)