The bike "stumbles" at 4000-4500rpm - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 17 Old 06-30-2007, 05:49 PM Thread Starter
 
Join Date: May 2007
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The bike "stumbles" at 4000-4500rpm

My KLR seems to "fall on it's face" at 4-4.5K for about 2-3 secs, anybody have an idea if this sounds like a rich or lean problem, the bike start fine w/o a choke.

I checked the plug wire and it looks fine, pulled the tank and checked the plug and it looks good and black.

I checked all the lines going to and from the carb and they all "look" good.

I cleaned the k&N air filter, changed the oil.

I just added a fuel additive.

I even installed a (Supertrapp) pipe and the problem persists.

Any other suggestions before I take it to the shop????



Thanks,

Tom
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post #2 of 17 Old 06-30-2007, 08:25 PM
 
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did you rejet the bike after changing the pipe?
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post #3 of 17 Old 06-30-2007, 09:18 PM Thread Starter
 
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Quote:
Originally Posted by Whitey View Post
did you rejet the bike after changing the pipe?
The bike had this problem before and after the pipe.
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post #4 of 17 Old 06-30-2007, 10:21 PM
 
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I know they are really lean to start with and adding a free flowing pipe will make it evern worse. Is the plug fouled black, or just normal dark? Does it seem to be ignition or fuel related? Just curious.
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post #5 of 17 Old 07-01-2007, 12:26 AM Thread Starter
 
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The plug is super black but not moist, I'm not sure if it's fuel or ignition, I was leaning towards fuel just because it's more common.
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post #6 of 17 Old 07-01-2007, 12:29 AM Thread Starter
 
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The bike will not hit a top speed becuase of this problem, at about 70 it just starts sputtering and jerking and won't go any faster.
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post #7 of 17 Old 07-01-2007, 06:31 PM
 
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I would pull the carb and clean it out, reassemble and rea djust air/misture. Plug should be a dark tan on the center. It sounds too rich to me.
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post #8 of 17 Old 07-01-2007, 11:34 PM Thread Starter
 
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Yeah I looked in the manual and it does appear to be way too black. I'm not sure if I'm up to the challenge of taking apart my carb...


I plan to change the plug along with a few vacuum lines and take a ride with the fuel additives and see what happens.


Tom
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post #9 of 17 Old 07-02-2007, 08:42 PM
 
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I have heard of a few carb cleaners that really work well, i hope that does it for you.
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post #10 of 17 Old 07-02-2007, 09:28 PM Thread Starter
 
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Well I took it for a 20 mile ride, at first I didn't see a difference so I decided to take it to the shop, I went through the gears 4-5 times and it was running fine, I decided to go up to the mountains and it did stumble a few times(50%?).

I'm hoping the the carb cleaners a kicking in..... and the more I ride the better it will get? I hope..


Tom
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