8500

[Ihaveadragon]

Hey all, yesterday on the trail noticed 8550 lol Though ok elevation difference. Well we got to our spot and started rippin and im pretty sure i seen 8500 on a steep little pull.

On hard pulls since after break in period, i noticed a metal on metal sound like bang bang bang when really working the motor, kinda brushed it off thinking its the clutch but now im thinking it the throw of the pistons.

So can i just tighten the secondary deflection screw and it should bring them rpms down?

Also my bud glazed his belt hard....will soap and water get that out?

 

[Snowbird11]

So can i just tighten the secondary deflection screw and it should bring them rpms down?

Also my bud glazed his belt hard....will soap and water get that out?

80 grit sandpaper can help break up the glaze on the belt. scotch brite on the sheaves will take rubber off the clutch. use an out to in motion to clean it off (perpendicular to the direction of travel of the belt).


can't speak to your particular rpm issues but typically extra weight on the primary takes care of that. if that rpm is out of the ordinary, you might look for a leak causing a lean condition.

 

[Drewd]

Primary weight increase by 2 grams should put you at desired rpm of 8250.

cut/paste from bmp website;

Here are some general clutching rules you should play by!

Primary clutch (Drive Clutch) = Front clutch off the motor
Secondary Clutch (Driven Clutch) = Rear clutch connected to drivetrain
Peak RPM = The RPM the machine sits and holds most of the time at WOT. This needs to be in your model's peak powerband for best results,
More Primary Clutch Weight = Less peak RPM & greater belt squeezing force
Less Primary Clutch Weight = More Peak RPM & less belt squeezing force
Primary Spring Starting Rate = Controls Engagement
Stiffer Primary Spring Starting Rate = Higher engagement RPM
Softer Primary Spring Stating Rate = Lower engagement RPM
Primary Spring Ending Rate = Controls Up Shift, Back Shift & Peak RPM
Stiffer Primary Spring Ending Rate = Slower Upshift, Quicker Backshift, More Peak RPM
Softer Primary Spring Ending Rate = Faster Upshift, Slower Backshift, Less Peak RPM
Steeper Helix Angle = Faster Upshift, Slower Backshift
Shallower Helix Angle = Slower Upshift, Faster Backshift
Stiffer Secondary Spring Finish Rate = Slower Upshift, Faster Backshift
Softer Secondary Spring Finish Rate = Faster Upshift, Slower Backshift

 

[Ihaveadragon]

Primary weight increase by 2 grams should put you at desired rpm of 8250.

cut/paste from bmp website;

Here are some general clutching rules you should play by!

Primary clutch (Drive Clutch) = Front clutch off the motor
Secondary Clutch (Driven Clutch) = Rear clutch connected to drivetrain
Peak RPM = The RPM the machine sits and holds most of the time at WOT. This needs to be in your model's peak powerband for best results,
More Primary Clutch Weight = Less peak RPM & greater belt squeezing force
Less Primary Clutch Weight = More Peak RPM & less belt squeezing force
Primary Spring Starting Rate = Controls Engagement
Stiffer Primary Spring Starting Rate = Higher engagement RPM
Softer Primary Spring Stating Rate = Lower engagement RPM
Primary Spring Ending Rate = Controls Up Shift, Back Shift & Peak RPM
Stiffer Primary Spring Ending Rate = Slower Upshift, Quicker Backshift, More Peak RPM
Softer Primary Spring Ending Rate = Faster Upshift, Slower Backshift, Less Peak RPM
Steeper Helix Angle = Faster Upshift, Slower Backshift
Shallower Helix Angle = Slower Upshift, Faster Backshift
Stiffer Secondary Spring Finish Rate = Slower Upshift, Faster Backshift
Softer Secondary Spring Finish Rate = Faster Upshift, Slower Backshift

Awesome!! Thanks