Growls, lacks power 6000-8000 RPM?

[Roger]

Hi All

My 2007 RS Venture, 17000km, 10500 miles sled is acting up.
There seems to be a growl and slight vibration between 6000-8000 RPM. It also lacks power in that range. It starts and runs fine.
I've cleaned the primary as best I can without splitting the clutch. My neighbour, a Polaris Mechanic, thinks the primary clutch is fine. I've cleaned the secondary and changed the buttons. I changed the exhaust o-rings, because they were literally gone. I tried a different belt also. I adjusted the track tension, and checked the chaincase tension.

The lack of power, and growl/vibration is still there.

I'm going out right now to check the Jack shaft and Drive shaft bearings for play. I'm then going to install a brand new belt and test drive it.

Any suggestions to help me nail this problem down?

Thanks

Roger

 

[APEX 06]

Have you check the plugs and the crabs.

 

[Roger]

The carbs were cleaned at the start of the season, and I never checked the plugs. I'll do that right now, as I just came in to get dressed. The bearings don't have any play in them.

 

[APEX 06]

Did it do this after getting gas.

 

[Roger]

It's been doing this for a couple of tanks of gas.
I checked the plugs, and my right plug was wet before I started it tonight. Could it be the jet sticking a bit, with a bit of flooding happening at that rpm?

 

[APEX 06]

The crabs my of got some crap in them I pull the and clean them, then run a can of seafoam in it.

 

[Roger]

I'm going to try to clean them again.
Thanks for now.

 

[shed]

check the bearing behind the driven
could be going/resonating

 

[Roger]

Hi Apex and shed

I cleaned the carb again, with the wet plug. Took it for a test drive and all seemed well. I'm going for a good run Sat./Sun. and will report if it's still running well Sunday night.

Thanks

 

[APEX 06]

Hope it runs good for you.

 

[kyzer]

How old is your belt, and what type is it ???

 

[Roger]

I run Yamaha belts as the others don't last for me.

Everything ran perfect this weekend. 350k.m. and all is well.

My week vacation starts now, and it's off towards Cochrane from home.

2500km's in 8 days is always a good trip.

 

[pat the rat]

i'll be in cochrane wednesday and thursday,have fun