Pilot jet - 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 6 Old 02-23-2016, 02:19 PM Thread Starter
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Location: Parker, CO
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Question Pilot jet

Has anyone gone up one size on the pilot jet?

My bike has a dynojet stage 1 jet kit in it, and it runs great with it. However, it had a stumble right off idle, and going up one size in my pilot jet fixed it. Another benefit was that it starts up quicker. Idling, it smells rich though.

Just curious if anyone else has swapped out pilot jets.

Edit: 2003, Uni filter, Lexx exhaust
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post #2 of 6 Old 02-23-2016, 07:42 PM
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No, haven't changed pilot jet size, myself.

Just wondering: Did you fiddle with your idle mixture screw any before you changed the pilot jet?

Backing out the idle mixture screw to 1-3/4 turns worked rather well for my otherwise stock engine.
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post #3 of 6 Old 02-23-2016, 08:43 PM
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Quote:
Originally Posted by JasonK94Z View Post
Has anyone gone up one size on the pilot jet?

My bike has a dynojet stage 1 jet kit in it, and it runs great with it. However, it had a stumble right off idle, and going up one size in my pilot jet fixed it. Another benefit was that it starts up quicker. Idling, it smells rich though.

Just curious if anyone else has swapped out pilot jets.

Edit: 2003, Uni filter, Lexx exhaust
Yes, I had to.
I installed a 2008+ header pipe on my Gen1 1987. It wasn't quite happy, with-out some changes.

Try turning down your idle speed to 1000-1100 and then turning IN your idle mixture screw, see if it brings your idle speed back up to 1250-1300rpm and eliminates the 'rich smell'.

Mixture screw has best adjustment range between 1 and 2&1/2 turns out.

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
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post #4 of 6 Old 02-24-2016, 08:13 AM Thread Starter
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Thanks. Seems I let my bike sit too long without starting it this winter. Gotta clean the carb first. Won't run without the choke. Pilot jet must be gummed up now.


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2003 KLR 650
Cogent suspension front and rear, jet kit, Lexx pipe, Uni filter, D606 tires
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post #5 of 6 Old 02-24-2016, 03:35 PM
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I often find the bleed holes in the sides of idle pilot jets to be restricted by build up. The KLR pilot jet holes are #64 number drill.

Chalked up bleed holes makes for a rich mixture and not uniform delivery.
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post #6 of 6 Old 02-24-2016, 08:10 PM
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I often find the bleed holes in the sides of idle pilot jets to be restricted by build up. The KLR pilot jet holes are #64 number drill.

Chalked up bleed holes makes for a rich mixture and not uniform delivery.
I usually find the 'center' fuel hole 'severely restricted' or completely 'plugged', when a unit will not even attempt to idle. As well as the air bleed holes restricted.

Holding the suspect pilot jet facing a White Surface, if the center hole appears 'amber/tan' in color, you are looking thru 'sugar candy'! If the brass parts are Green, its very old fuel also, burn it in the lawn mower or just burn it.

Thank the corn farmers and their politician's.
Renewable fuels, MY ASS! "Stop the subsidies", is my only battle cry.

pdwestman
Modify at "YOUR OWN RISK"!

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