Engine bogging down at 3-4000 rpm’s - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

  • 1 Post By pdwestman
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post #1 of 2 Old 11-25-2019, 08:12 AM Thread Starter
Join Date: Nov 2019
Posts: 2
Engine bogging down at 3-4000 rpm’s

While in neutral or riding it, the engine bogs down to almost dying and then catches up on the rpm’s. It feels almost like a rev limiter. Here is what I have done to the bike so far:
Bike is a 2006 with 7,000 miles, all stock muffler, carb, no jet kit, elevation here in AZ is 5,000ft.
Cleaned and coated the inside of the gas tank in Sept.
Put in new gas again yesterday
Installed a eagle mikes gravity fed petcock in Selp
Rebuilt carb in September and took it out again yesterday to clean it, diaphragm is not torn and carb was clean, pilot jet etc
Put in new spark plug yes
Put in stead engineering brass choke tube, started up bike and took the brass choke barrel off to rule out the choke and there was no change.
Adjusted fuel mixture screw again yesterday
Opened gas tank, no pressure or vapor lock tried reserve with no change
De smogged bike last week and put all that smog equipment back on to see if that was the cause of the bogging down and there was no change
Bike starts up and idles fine
Thanks again for your help Greg.
Greg B is offline  
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post #2 of 2 Old 11-25-2019, 12:12 PM
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 6,172
I'll guess that you have Not confirmed that all 3 of the low speed Transition fuel ports drilled under the bottom lip of the throttle plate are 100% clean.

Those 3 outlets get their fuel from the pilot jet as does the external low speed mixture screw.
With the pilot jet removed from inside the carb, I use a tiny wire, bent 90 degrees to poke down thru the 3 holes. Then aerosol carb cleaner & compressed air to blow any trash back thru the pilot jet tower. Next close the external mixture screw.

Then insert the straw of carb cleaner into the pilot jet tower & confirm all three holes flow a full stream. If clean, reinstall pilot jet & readjust external mixture screw.

Have you read the link in this link? https://www.klrforum.com/how-tos-tec...ing-cvk40.html
Then watch the videos.
DPelletier likes this.

Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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