Friction Drive Clutch Question

[floridaboy]

I have a BMP FD with a Monster two cycle engine on my Electra bike. I have found that the clutch wants to fully engage about 15-17 mph. When i slow down below 15-17 mph the clutch disengages makeing rideing at any speed below that speed with power impossible. Other wise not able to ride say 8-10 mph with power. Is this because this is a two stroke and the clutch has a high engagement speed? Would a four stroke engine allow me to ride at a slower speed?

 

[unior]

First make sure your roller isn't slipping on the tire.

If not look for weaker clutch springs. Sounds like you have stiff springs. Weaker springs will engage faster.

 

[floridaboy]

Thank you for your reply. The roller is not slipping. I am thinking that the spring could be to strong also. Wanted to see what others that have a Monster engine say. Does anyone know if a four stroke clutch engages at lower speeds?

 

[unior]

the clutch is the only differentiator

 

[floridaboy]

Thanks for all the replys. I have decided it must be a bad clutch so i ordered a new complete clutch and will replace it. Other then the clutch problem it is a great FD and the engine is getting stronger the more it breaks in.

 

[floridaboy]

I got the clutch today from Scooter Parts and replaced the old one. It is working good and solved all my problems i was haveing with the old one.

 

[Whizzerd]

Glad to hear you're problem fixed FB. Nice bike BTW. Do you experience much vibration w/ your 2 stroke? How's the noise level?

 

[floridaboy]

The clutch was the problem it now engages sooner and disengages at a lower speed. There is little vibration with the engine but it is quite loud at higher speeds. Other then the loudness i am pleased with the engine and the power.

 

[5-7HEAVEN]

Yes, it was probably the stiff clutch spring. My GP460 engine engages at 8,000rpm. Softer springs allow it to engage as low as 3,000rpm, which is better for MB application.

 

[adb140275]

Glad to hear you're problem fixed FB. Nice bike BTW. Do you experience much vibration w/ your 2 stroke? How's the noise level?

I have the same engine on my BMP kit. its loud, thirsty, but it screams. vibrates a bit at idle (enough to shake my mirror around)