Bike bogs down when throttle brough beyond the half way point - 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 35 Old 09-24-2010, 04:22 PM Thread Starter
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Bike bogs down when throttle brough beyond the half way point

I have an 85 KLR and when it is cold it takes about 10 kicks to get it started. Once warm it starts right back up. it runs great through the first half of the throttle range but when the throttle is advanced beyond that the bike bogs down and starts to slow. This happens in every gear. I pulled the carb to clean it but when i opened it up the bowls looked clean as well piston/main chamber. I did not unscrew or remove anything beyond that because everything looked spotless. After that I checked the air filter which was clean and i ensured the carb was sealed tight on both sides. Any thoughts on what to check? Should I dive deeper into the carb or is that going to be a waste of time which i probably will mess up trying to put back together with the same exact settings as before?

Thanks,

Jason
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post #2 of 35 Old 09-24-2010, 07:38 PM
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Originally Posted by Emb110Capt View Post
I have an 85 KLR and when it is cold it takes about 10 kicks to get it started. Once warm it starts right back up. it runs great through the first half of the throttle range but when the throttle is advanced beyond that the bike bogs down and starts to slow. This happens in every gear. I pulled the carb to clean it but when i opened it up the bowls looked clean as well piston/main chamber. I did not unscrew or remove anything beyond that because everything looked spotless. After that I checked the air filter which was clean and i ensured the carb was sealed tight on both sides. Any thoughts on what to check? Should I dive deeper into the carb or is that going to be a waste of time which i probably will mess up trying to put back together with the same exact settings as before?

Thanks,

Jason

Valves need adjusted.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #3 of 35 Old 09-24-2010, 07:54 PM Thread Starter
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Thanks, I will give that a try. Is that something I can do by referencing a service manual or should I have someone smarter than me do it???
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post #4 of 35 Old 09-24-2010, 09:56 PM
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Hi Jason, welcome to the forum. Keep in mind we don't have the benefit of hearing, smelling licking or feeling that you have being there on site. So some suggestions are helpful shots in the dark. And this just might be one right here. I'd suggest you run a therapeutic dose of carburetor cleaner through there before I wrenched anything. You might have a bit of carbon blocking or varnish buildup out of sight in the carb. A number of snake oils will do the trick if this is the issue. Sea Foam is the current favorite. Chevron Techron Concentrate Plus Fuel System Cleaner rates high in my book. Berryman B-12 Chemtool® Carburetor Fuel Injector and Fuel System Cleaner is another snake oil that has worked well for me. Most of these can be found at WalMart or your auto parts supply house. The instructions on the containers of these chemicals will suggest a maintenance dosage.....I'd be adding a therapeutic dosage. Let it marinate in a 50 / 50 mix a while. Start, run the rpm's up and down and let sit some more.

Another possibility [and there could be 40 possibilities] is a diaphragm issue on the slide. Might want to pull the top cap off the carb and check the condition of the diaphragm if the snake oil does not straighten things out. Classic symptom of problems with the diaphragm is a stumble coming off the slow jet circuit.

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post #5 of 35 Old 09-26-2010, 09:29 AM Thread Starter
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update

Ok, so I decided to try the simple solution first and bought some Sea Foam. Added a large amount to tank and let it run for a bit/ then let it sit over night. then ran it some more.--------Bike starts up after a few kicks when cold now, also now, when i go to give the bike full throttle it still starts to bog down but then it works it's way through it and will give me full power... ........however, when i work through the bog and get the full power, the bike stalls out when that power is brought back out. When this happens it is very tough to start back up, 10-15 min and a bruised foot kinda hard. Does it sound like I just need to give the sea foam more time,,? is there anything i can do to help the process? or does it sound like something else may be wrong too????
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post #6 of 35 Old 09-26-2010, 09:37 AM
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Originally Posted by Emb110Capt View Post
Ok, so I decided to try the simple solution first and bought some Sea Foam. Added a large amount to tank and let it run for a bit/ then let it sit over night. then ran it some more.--------Bike starts up after a few kicks when cold now, also now, when i go to give the bike full throttle it still starts to bog down but then it works it's way through it and will give me full power... ........however, when i work through the bog and get the full power, the bike stalls out when that power is brought back out. When this happens it is very tough to start back up, 10-15 min and a bruised foot kinda hard. Does it sound like I just need to give the sea foam more time,,? is there anything i can do to help the process? or does it sound like something else may be wrong too????
Have you drained the float bowl on the carburetor? Water will collect in there, and that will give you headaches. To me, if you found improvement with Sea Foam, you may just have some buildup in the carburetor rather than a mechanical failure somewhere. I would drain the float bowl and add a strong dose of snake oil by adding it into the carburetor through the fuel line. Disconnect the fuel line at the petcock and coax a straight dose of cleaner into the carburetor. Reconnect fuel line and try the run / soak cycle again. if that doesn't clear the issue up, you may need to go in and remove and clean the jets. I've done a number of cleanings without removing the carburetor from the bike. Cleaning is not that difficult. Here is a bottom view of the carburetor after removing the float bowl and float.




******
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
[/I]
[IMG]http://i718.photobucket.com/albums/ww187/vatrader01/KLR%20mechanical/04e28c5e.jpg[/IMG]

[FONT="Century Gothic"][I]Sometimes your only available transportation is a leap of faith[/I] [/FONT]

Last edited by vatrader; 09-26-2010 at 10:08 AM. Reason: Added content
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post #7 of 35 Old 09-26-2010, 10:42 AM Thread Starter
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I did drain the bowl about a week ago. I will try adding some cleaner straight to the fuel line. If that doesn't work I will pull the carb back apart. Thanks for the pics, those make for an excellent reference!
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post #8 of 35 Old 09-26-2010, 03:33 PM Thread Starter
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What is this and where does it go?

Decided to take the carb apart and when i pulled out the floats this piece was just rattling around in there....Anybody know what this is and where do i put it?

Thanks
Attached Images
File Type: jpg Carb.jpg (278.6 KB, 22 views)
File Type: jpg Carb (1).jpg (213.5 KB, 28 views)
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post #9 of 35 Old 09-26-2010, 04:24 PM
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Originally Posted by Emb110Capt View Post
Decided to take the carb apart and when i pulled out the floats this piece was just rattling around in there....Anybody know what this is and where do i put it?

Thanks
That would be your float valve.





******
“many a trip continues long after movement in time and space have ceased”- Steinbeck, [I]"Travels with Charlie"
[/I]
[IMG]http://i718.photobucket.com/albums/ww187/vatrader01/KLR%20mechanical/04e28c5e.jpg[/IMG]

[FONT="Century Gothic"][I]Sometimes your only available transportation is a leap of faith[/I] [/FONT]

Last edited by vatrader; 09-26-2010 at 05:03 PM.
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post #10 of 35 Old 09-26-2010, 05:06 PM Thread Starter
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ahhhhh!!! I C
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