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Discussion Starter #1 (Edited)
Hey guys

I have an 02 954 and it's recently developed some strange problems...

1) If the bike it sitting in neutral and you twist the throttle moderately, the bike seems to bog a bit before the RPM's come up.... Is this normal?

2) the bike has seemed to develop a strange vibration/noise at abour 4K rpms up.
It's hard to describe but it a very small vibration at high frequency, it's not enough to effect bike handling, but it does make my hands numb after a long ride (never did before)

The bike has 10K and as far as I know, has original plugs. I change the oil at 2500 miles. There is about 2200 miles on the oil now. It's honda HP-4. The air filter seems ok too. I hear people say something about adjusting the air box flapper and some device in the exhaust?? I don't really know where to go with this, time to change plugs?... any thought would be helpful

ALSO when you turn the key to prime the fuel pump, the (humming) sound the pump makes sometimes seems like it's not that powerful... IE the wine from the fuel pump changes it's frequency... can these pumps start to go out but not die completely?

Bike is stock except eron slip on

Robb
 

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1) No, not normal
2) Vibration could be caused by a lose cam chain tensioner?


Fuel pumps usually work or dont. Is the battery strong? At least 12.7 V

The device in the exhaust is the HTEV, a rotational valve that moves 90 degrees at 3k rpm, and then 180 degrees at 8k to adjust the amount of backpressure.

The airbox flapper is controlled by the same device as the HTEV, however only moves at 8k rpm. It serves to reduce intake noise.

I would remove the flapper, it is useless and it reduces stress on the gears inside the servo motor.
 

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Discussion Starter #3
Thanks for your reply, any thoughts on the bog that i'm getting?

Is a loose cam chain tensioner common with these bikes? How would this be fixed

Battery is new and above 12.7V
 

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It common depending on your miles. Not sure if valves cause vibration, but certainly ticking at lower rpms. Those need to be serviced or at least checked at 16k miles.

If the battery is strong, but the pump isnt perfect each time, check the main ground from it to the frame. It has no rubber washer and frequently comes lose.

The bog could be due to the HTEV between stuck.

Check the plugs to see if they're black, if yes, it is carbon build up from running too rich. I doubt it though since you have a slip on which usually leans out the mixture.
 

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Discussion Starter #5
It common depending on your miles. Not sure if valves cause vibration, but certainly ticking at lower rpms. Those need to be serviced or at least checked at 16k miles.
Miles are at 10K currently

If the battery is strong, but the pump isnt perfect each time, check the main ground from it to the frame. It has no rubber washer and frequently comes lose.
Ok, so to find this ground just trace the negative battery wire back to the frame and be sure that it's tight?

The bog could be due to the HTEV between stuck.
Is this something I can check, and if so, how would I?


Thanks!

Robb
 

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At 10k, valves and CCT should be Ok.

As for the ground, lift the tank and find the yellow/red that leads from the pump to the frame. I believe its held on with a 10mm bolt

To check your HTEV, have someone rev the engine to 3k and 8k while you watch for movement of the valve.
Or
Disconnect the cables at the valve and rotate by hand. It should be quite lose.
 
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