How important are the Pistons?

**MrOzz** · 05-15-2009, 02:32 PM

Check here. you can get the set of 4 for around $60.00

http://www.powersedge.com/pages/part.../2/Yamaha.aspx

**digitalsam** · 05-15-2009, 02:39 PM

Originally posted by MrOzz

Check here. you can get the set of 4 for around $60.00

http://www.powersedge.com/pages/part.../2/Yamaha.aspx

I just checked the site, the $60 is per piston. Thanks though. Do you think it is worth the $250+ or can I reuse the old ones? I don't want to redo this, but I would rather not spend the money if I don't have to.

**MartyA** · 05-15-2009, 04:51 PM

You do have a shop manual? Clymers? There is a procedure to check the wear. Put the ring on the piston, put it into the cylinder, measure the gap at the ends of the ring. I don't recall the gap tolerances. Should be in the manual.

**cowboybob998** · 05-15-2009, 06:55 PM

I dont mean to ask a stuped question, but how you gona measue the gap with the pistion in the cylinder.

**cowboybob998** · 05-15-2009, 06:57 PM

I got it you put the ring in the cylinder, not the piston, sorry been a long day

**b.walker5** · 05-15-2009, 07:01 PM

Push the ring down the bore a little with the piston so it's sitting nice and square before you measure the gap

**cowboybob998** · 05-15-2009, 07:07 PM

If I had an motor down that far i think i would put new rings in it, chances are you aint gona get the rings back in the same place as they were befor and i bet ya its gona burn oil, been there an done it

**MartyA** · 05-15-2009, 08:18 PM

Yeah sorry I didn't mean to put the rings into the grooves, I did mean push them into the cylinder with the piston to keep them square.

I'd consider putting them back in if I was a bit short of funds. But I would consider the mileage, the ring gap, and the condition of the cylinder walls by examining them very closely, and polish the walls a bit to get the microscopic peaks down. NOT the full .025" but maybe a .002-.004" again depending upon the ring gap. That motor is a good one and it should stand. Use liberal amounts of assembly grease and give it a go.

Just a thought.

**XSPastor** · 05-15-2009, 08:20 PM

Guys! He's talking about the piston wrist pin clips - not the rings. He wants to know if he can re-use those. I don't see any problem with re-using them as long as they fit good and tight.

**tw1980** · 05-15-2009, 08:42 PM

Thanks preacher I thought I'd lost my mind

Yes I don't see any reason why you can't reuse the clips.Just make sure they still fit tight in the piston slots.If you're talking about the rings listen to what the other guys wrote

**trbig** · 05-15-2009, 09:07 PM

The only time I don't re-use them.. is when they shoot into the black nothingness of the deepest recesses of the garage when I don't get them hooked well before letting go with the pliars.