Bike jumping and lerching? - 600RR.net
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post #1 of 10 (permalink) Old 01-27-2009, 09:55 PM Thread Starter
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Angry Bike jumping and lerching?

Its hard to explain but when im riding...say in 3rd gear and i get up to speed in traffic, let off the throttle to maintain a steady speed the bike kinda jumps...like im fluttering the throttle or something? sounds like im reving a chain saw? I dunno its hard to explain but seems like i have to constantly excelerate or deaccelerate to keep it from doin it?

2006 TRX 90
2006 TRX 450R
2006 CBR 600RR-BlackStolen
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post #2 of 10 (permalink) Old 01-27-2009, 10:06 PM
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Is the engine revving abnormally when this is happening? It could just be an improperly adjusted chain.
post #3 of 10 (permalink) Old 01-27-2009, 10:14 PM Thread Starter
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the engine revvs and idles fine in neutral just when im in gear it seems to do this. could it be my chain is too tight? I recently adjusted the chain cause it was real sloppy, maybe i got it too tight?

2006 TRX 90
2006 TRX 450R
2006 CBR 600RR-BlackStolen
2007 CBR 600RR-Double R Tinted
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post #4 of 10 (permalink) Old 01-27-2009, 10:26 PM
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If the chain was loose it would be more likely to jump upon downshifting. The fact that it jumps is the ECM wanting to "go go go" because thats how the bike is built to ride. Kinda hard to explain but there is a throttle postion sensor on every make of ever kind of computer driven vehical to maintain throttle postion for the proper fuel are mixture at the throttle body. Thats whats jumping back and forth most likely.

However if is a major "jump" that could cause you to lose control you need to take it to a shop to be looked at, because you could have computer problem that in the best case will just need to be reset.

Oh another thing that just popped in my head is some people forget that your chain is not the only thing that can have "lag". Your throttle cable can too. With that being said the throttle cable and the tension on it could be wearing leading you to have to maintain a more controlled grip on the throttle than say a new bike where you may only have to apply set tension from the palm.

Just a thought plus brainstorming your issue. Hope it helped.

-Izuumi-

-I got two guns one for each of yah'-
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post #5 of 10 (permalink) Old 01-27-2009, 10:29 PM
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Oh and another simple fix could be just cleaning the throttle body it could just have some carbon build up. Being that you own an 06 and depending upon how often your ride and the environment could just be that simple problem with a simple fix.

-I got two guns one for each of yah'-
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post #6 of 10 (permalink) Old 01-27-2009, 10:30 PM
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happened on my old car a few years ago... there was a sensor somewhere failing (TPS or something like that), then the timing was thrown off by it and eventually the car threw a rod... sounded like someone was hitting the block with an air hammer lol

not sure if this could also happen with the bike

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post #7 of 10 (permalink) Old 01-27-2009, 10:38 PM Thread Starter
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its an '07 and i just replaced the clutch lever..maybe I have the cable too tight?

2006 TRX 90
2006 TRX 450R
2006 CBR 600RR-BlackStolen
2007 CBR 600RR-Double R Tinted
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post #8 of 10 (permalink) Old 01-27-2009, 10:40 PM
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Originally Posted by das10kid View Post
the engine revvs and idles fine in neutral just when im in gear it seems to do this. could it be my chain is too tight? I recently adjusted the chain cause it was real sloppy, maybe i got it too tight?
It would be more associated with a loose chain. Too much slack would make the bike seem like it's jumping.

How much slack is in your clutch?
post #9 of 10 (permalink) Old 01-27-2009, 10:45 PM Thread Starter
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very little slack in the clutch..i mean im not really sure how to measure it but just to where the lever is not loose

2006 TRX 90
2006 TRX 450R
2006 CBR 600RR-BlackStolen
2007 CBR 600RR-Double R Tinted
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post #10 of 10 (permalink) Old 01-27-2009, 10:53 PM
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Loosen it up some so that the clutch is fully engaged when the lever isn't being pulled.
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