Any ideas on this rev issue?

[killerrf]

I dont know anymore. Thought a new belt was fixing it but it back to its old ways.

 

[slyrydr]

sounds similar to exhaust valves not opening consistently.....couple of posts about arm of power valve binding....bending bracket has helped several guys..

 

[killerrf]

sounds similar to exhaust valves not opening consistently.....couple of posts about arm of power valve binding....bending bracket has helped several guys..

Bracket was bent at cat dealer to make sure thats good.
I had put a new belt on and it seemed to
Hold revs like it should for 75-100 miles after that it just went back to revving like this. To me its either servo motor isnt keeping valves open and losing but i dont have error codes that pop up at all. Or engine is weak. I had an 03 f7 did this exact same thing couldnt pull and hold rpms. Dealer ended up doing new top end and then it ripped after that. I had did a quick comp test but i dont trust actual psi number of gauge but it looked about 10 psi less on mag side then pto side. Im getting 600cc hp at these revs might as well trade it in and swap for a 600 lol

 

[Old & slow]

If you’re thinking it’s the top end a leak down test will confirm

 

[Chewy22]

Bracket was bent at cat dealer to make sure thats good.
I had put a new belt on and it seemed to
Hold revs like it should for 75-100 miles after that it just went back to revving like this. To me its either servo motor isnt keeping valves open and losing but i dont have error codes that pop up at all. Or engine is weak. I had an 03 f7 did this exact same thing couldnt pull and hold rpms. Dealer ended up doing new top end and then it ripped after that. I had did a quick comp test but i dont trust actual psi number of gauge but it looked about 10 psi less on mag side then pto side. Im getting 600cc hp at these revs might as well trade it in and swap for a 600 lol

There has also been issues with the powervalve guides in the cylinder jugs. You might also have some binding issues with the secondary helix. I had the secondary issue on my 19, replacing the helix fixed it.

 

[Vern]

I’ve also seen guys having issues with the bolt that clamps the arm the cable pulls on to the power valve shaft coming loose allowing it to slip on the shaft and not open the valve consistently. Been wondering if checking the torque on them bolts should be a routine thing.

 

[ratlover]

Having issues with the vid on my phone so cant really comment. But My power valve actuator rod started randomly binding after 60 or so miles. Could see slight rub mark on rod. Never threw a code. Did a bit more bending and has been fine.

 

[tenacious84]

Bracket was bent at cat dealer to make sure thats good.
I had put a new belt on and it seemed to
Hold revs like it should for 75-100 miles after that it just went back to revving like this. To me its either servo motor isnt keeping valves open and losing but i dont have error codes that pop up at all. Or engine is weak. I had an 03 f7 did this exact same thing couldnt pull and hold rpms. Dealer ended up doing new top end and then it ripped after that. I had did a quick comp test but i dont trust actual psi number of gauge but it looked about 10 psi less on mag side then pto side. Im getting 600cc hp at these revs might as well trade it in and swap for a 600 lol

Put a new belt on and it will be good for another 75-100 miles. Trail guys over on HCS have confirmed the secondary set-up on these machines is poor and it glazes the belt very quickly. What you are describing is exactly what they are seeing and describing. Making a helix and secondary spring change has eliminated that specific problem for the most part.

 

[killerrf]

Put a new belt on and it will be good for another 75-100 miles. Trail guys over on HCS have confirmed the secondary set-up on these machines is poor and it glazes the belt very quickly. What you are describing is exactly what they are seeing and describing. Making a helix and secondary spring change has eliminated that specific problem for the most part.

Cat can buy my helix and spring then lol. I mean if mostly the clutching then still on them.

 

[Super 8]

Put a new belt on and it will be good for another 75-100 miles. Trail guys over on HCS have confirmed the secondary set-up on these machines is poor and it glazes the belt very quickly. What you are describing is exactly what they are seeing and describing. Making a helix and secondary spring change has eliminated that specific problem for the most part.

Basically the same set up that come on the 600's, why not as pronounced on the 6's?

 

[tenacious84]

Basically the same set up that come on the 600's, why not as pronounced on the 6's?

I'm guessing 120 hp vs 170 hp.

 

[killerrf]

Well if the 600 secondary is the same as 858 only difference is tuning, power valves and amount of weight in primary. Wife riot 600 hits 8100-8200 no matter when you mash throttle.

 

[Pirate16]

 

[Sage Crusher]

That is BRAVE Night rider!!!