copper donuts? clutching? max 9900 rpm

[ebockus]

my sled maxes out at 9900 rpm. stock everything no studs. from researching all morning i came up with a couple posibilties, plugs, coils, fuel filters, cluthing and donuts.
im wondering where to buy copper donuts and what is the best wieghts and spring for primary, best spring for secondary?
the plugs are new last season and i have apex coils on my 2005 rx-1.
thanks guys

 

[grader]

run an orange-silver-orange yamaha spring in the primary, a silver yamaha spring in the secondary with 70 degrees twist (6 and 1). remove coils and remove rubber from coils and clean with brake clean inside and out, put di-electric grease in each when done. remove airbox foam and clean with solvent, dry and replace. your looking for max rpm of 10300 to 10700.

 

[ebockus]

nice... thanks 3500kms this season hoping for one more ride boys

 

[horsroute]

The only place i know to buy copper exhaust donuts for all Yamaha four strokes snowmobiles is "Sled Toys" webside for the price of $17.00 each.I think they could last almost forever.

 

[sleddog66]

The only place i know to buy copper exhaust donuts for all Yamaha four strokes snowmobiles is "Sled Toys" webside for the price of $17.00 each.I think they could last almost forever.

Or OFT Racing sells them as well