Viper 34---Roller Diameter

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Help me to understand the theory. I've always thought that going to a smaller roller gives you more shift force(good).

An article in Am Snow stated that Yamaha increased the roller diameter to accommodate the track's added length?

I have a 2003RX-1 MTN and have been going to purchase the 15 or 15.6 rollers(ride sea level).

What I am I missing in my theory that smaller rollers better?

Thanks in advance,

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[Viper34]

A smaller roller does increase squeeze force in the beginning area of the clutch stroke. A smaller roller will lower engagement slightly.

An article in Am Snow stated that Yamaha increased the roller diameter to accommodate the track's added length?

A larger roller will decrease belt force in the beginning area of clutch stroke which is needed when you have more traction from a longer track, higher lug or studs. This keeps the clutches in a lower ratio slightly longer.

 

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Rollers

Thanks Viper34. is there a happy medium with this MTN sled, since I don't ride the mountains? Say better acceleration without losing the lower ratio if I split the difference and go to maybe a 15.6 roller? What do you think?

Got to stay ahead of your buddies you know!!!!!!!!!

Thanks again

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[rx1mtn]

Hey guys I think the smaller the rollers the more RPM for engagement. The service manule has the details and I don't have it right here. In my mouintain I put the larger dia. rollers, silver spring in the secondary and the stock helix for sea level. The original is a straight 45 deg. I can't remember what the angle of the stock unit is (my notes are at home)

 

[Turk]

A smaller roller makes the 1st 3/4 of your weight behave like a heavier weight. It will lower engagement & drop rpm,s. The larger roller was used to increase engagement & rpm,s due to the heavier weight & larger mass of the ripsaw track.

 

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Thanks Turk, I have the 2" paddle 151" and 16.5 rollers. Maybe I could go to a smaller roller without hurting the accelaration. What do you think?

Thanks Again,

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