How important are the Pistons?

[digitalsam]

I was assembling the Pistons today and am on hold until I can get new piston rod circlips that clip onto either side of the piston.

My question is how important is it to replace those with new ones?

and how important is it to replace the two Piston Rings that are around the pistons? The dealership can order them for $85 per piston! Are they made out of Gold?!?

[MrOzz]

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


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

[digitalsam]

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]

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]

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

[cowboybob998]

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

[b.walker5]

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

[cowboybob998]

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]

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]

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]

Thanks preacher I thought I'd lost my mindYes 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]

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.


Tod

[b.walker5]

How important are the Pistons?

Yeah... Pretty important....

[Crazcnuk]

What we need is for one or two of our bored Gurus to go through the Hastings site and figure out which rings we could use from them!

http://www.hastingsmfg.com/RingFinderDiametrical.aspx

[b.walker5]

http://www.hastingsmfg.com/RingFinde...?AppMACD=2.815

Standard bore size is 71.5mm. Equates to 2.184952 inches. Close enough to 2.815 to me. Only one choice offered in this size, 5264. 1st over at 2.835 has more choices, so you need to know the groove width. I suspect 2C5251 are the correct ones but someone with a piston handy to measure will be able to confirm.