RPM

[turbine tester]

I think my attak is turning a bit too high. I have stock clutching and a new belt with about 300 miles (first 200 were gentle miles) I am hitting 11,000 or just slightly under on the trail when I hit it. What is the target Rpm? (10,600-10,800???) What should I do to bring it down? I looked at the helix and sliders and they look good and is in No.3 on the outter hole, didn't take it apart to look at the inner.

 

[Capt.Storm]

Tachs can be off ..you're prolly fine.

 

[turbine tester]

Ya I know tachs can off but it was turning 10,700 0r 10,800 last year. how would I bring it down slightly?

 

[blevis213]

try replacing your primary spring, could be wore

 

[kuvasz]

change the setting on the secondary spring. if you change the setting to 6 or 9 it'll drop the rpm's by 200rpm each. i always run my sled at 10,800. big difference in power from 10,400 to 10,800. apex's make all their power at 10,800 and all their torque at 10,200.

 

[turbine tester]

Thanks kuvasz.


Hey blevis213, wouldn't installing a new front spring have an opposite effect?

 

[turbine tester]

Is 6 or 9 more tension or less? I would be looking for less correct?

 

[turbine tester]

Any Clutching guru out there?

 

[sideshowBob]

If your sled is starting to over rev for no apparent reason I would suggest trying a new belt.

The degrees of secondary spring wrap is the sum of the spring position hole in the clutch added to the spring hole position in the helix x 10.
For ex: spring end in number 3 hole in clutch
spring end in number 3 hole in helix
3 + 3 = 6 x 10 = 60 degrees spring wrap

The less degrees of spring wrap the lower the rpm.

On the Yamaha secondaries I would not run under 60 degrees of wrap, if your RPM is still too high you may have to change your primary spring to a lesser final spring tension.

 

[Riceburner]

Clean your clutches.
Scotchbrite your belt with soap & water.
Check Spring in secondary to make sure it is in the correct holes.
If those don't work, change the belt.
If that doesn't work add another gram [bigger rivet] in the tip of the primary weights.
Tuning RPM by decreasing secondary spring pressure is a band aid fix. It will slow your backshift.