Motorcycle jerking??

T

Travis25

Well-known member
So when im going around 20-35 mph staying at a steady speed my bike feels like its jerking. Rpms stay the same speed is the same but the bike has a back and forth jerking feel to it?
 
Travis25 said:
So when im going around 20-35 mph staying at a steady speed my bike feels like its jerking. Rpms stay the same speed is the same but the bike has a back and forth jerking feel to it?
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Could be a stretched or too loose chain.
 
Too high a gear perhaps? Perhaps you are in 5th and should be in 2nd or 3rd at that speed It's referred to as "lugging" the engine?
 
I believe it was you who said you changed your exhaust and/or filter without rejetting. And now it's running hot, and it's surging at cruising. Both symptoms of lean fuel mixture.

Rejet before you bugger your engine
 
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tricky said:
I believe it was you who said you changed your exhaust and/or filter without rejetting. And now it's running hot, and it's surging at cruising. Both symptoms of lean fuel mixture.

Rejet before you bugger your engine
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Yeah i been running it for a week like this. But the stuff i put on says runs with stock jetting also ive gotten 2mpg better gas mileage. But throttle response has a little hesitation.
 
Travis25 said:
Yeah i been running it for a week like this. But the stuff i put on says runs with stock jetting also ive gotten 2mpg better gas mileage. But throttle response has a little hesitation.
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The better mileage just follows from running a leaner mixture. If I were you, I'd check the spark plugs to see if they give any indication. But from what I'm hearing, you are probably lean.

Another possibility is your carbs are out of synch, or your chain has a tight spot
 
Big singles with CV carbs not jetted properly will do that. It's all over the internet. You need to get on a KLR650 forum asap.
 
Travis25 said:
Yeah i been running it for a week like this. But the stuff i put on says runs with stock jetting also ive gotten 2mpg better gas mileage. But throttle response has a little hesitation.
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Running hot from being lean might be adding to the higher temps you are seeing.

Either way get the mixture sorted out, it'll solve the issues you've been describing.
 
With modifications to your bike, and little knowledge in the field, I would say you have nothing to complain about.
Get a professional to look at the bike,
 
frekeyguy said:
Weird Thread title.
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I was expecting something completely different when I clocked this thread.

But since I'm here, this happened to me on my last bike. There was a seized link in my chain causing a tight spot.


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TAG23 said:
I was expecting something completely different when I clocked this thread.

But since I'm here, this happened to me on my last bike. There was a seized link in my chain causing a tight spot.


Sent from my iPhone using Tapatalk
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Ditto, ditto lol. Had a few seized links as well as loose/tight spots on the chain on my old bike and it acted jerky at low speeds.
 
TAG23 said:
I was expecting something completely different when I clocked this thread.

But since I'm here, this happened to me on my last bike. There was a seized link in my chain causing a tight spot.


Sent from my iPhone using Tapatalk
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AF4iK said:
Ditto, ditto lol. Had a few seized links as well as loose/tight spots on the chain on my old bike and it acted jerky at low speeds.
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if RPM and SPEED stays the same - it prob. isn't the chain.

When the chain has tight spots / loose spots, it will put more increase / decrease load on the motor which you should see reflect in the RPM speed. I am talking about a inc/decrease in rpm of 100-300rpm, and the speed will not be steady.
 
frekeyguy said:
if RPM and SPEED stays the same - it prob. isn't the chain.

When the chain has tight spots / loose spots, it will put more increase / decrease load on the motor which you should see reflect in the RPM speed. I am talking about a inc/decrease in rpm of 100-300rpm, and the speed will not be steady.
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I agree. I'll make some allowance for the rider's wrist though and still leave the chain as a possibility. RPMs did fluctuate a bit when my chain went bad but with the jerky motion I can imagine a few hundred revs variance going unnoticed.
 
:jerk:
 
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