pistons

[lukegoodon]

i have a dumb question. I have an 89 force 125 that has a bad piston. Do you need to change all the pistins or can you change just that one. I have been told to do it each way. What is the correct answer.

 

[Unbalanced]

Re: pistons

I've always thought that if one piston is bad, the others have probably suffered as well. It's worth peace of mind (to me) to change them all with new rings and a fresh hone - since you are going to take the motor apart anyway and the cost of the additional pistons/rings isn't too bad.

 

[Frank Acampora]

Re: pistons

Questions are 5 bucks, answers are 10, and correct answers are 100. LOL

The correct answer is: It depends!

Replacement pistons are balanced to factory weight, even in oversizes.

If the cylinder bores are in good condition, you need only to replace one piston. This can be done without disassembling the engine.

If the cylinder bore(s) are scored, then the affected cylinders must be overbored and oversized pistons installed. This requires disassembling the engine. If only one or two cylinders are affected, only they need to be done.

If three cylinders on a four cylinder engine are affected, you can do only three but you might as well do all four and in essence have a brand-new engine.

So: It comes down to the condition of the engine, amount of money you can afford, and how you feel about replacing pistons. GIMME MY HUNDRED! LOL

 

[lukegoodon]

Re: pistons

thanks the cylinders look good inside they have a slight black ring at the top i am thinking of reaming them out