Gen 1 Requires Choke even when warm - 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 19 Old 12-22-2019, 07:31 PM Thread Starter
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Gen 1 Requires Choke even when warm

Hi All,
I have a weird issue, Bike runs great when running, Starts fine when cold with choke. When it warms up, I still need to use the choke to get it started.
now, if its warm and i shut it off for about 10 seconds or so, it fires back up immediately, no choke needed. If the engine is off for anything longer than a couple of minutes I need to use the choke or it will just keep cranking even if I give it a little throttle.

I did have some overall hard cranking issues but I fixed that with a valve adjustment last year.

Only mods really are:
MC mod (Exhaust cam advance 1 tooth) done during valve adjustment.
22cent mod (I did not drill the slide, just the shims and mixer screw adjustment stock jets)
Uni air filter
Doohickey

Can someone point me in the right direction? I'm thinking is Carburetor related maybe i need to make some adjustments to the A/F mixture?
Thanks in advance!
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post #2 of 19 Old 12-23-2019, 10:14 AM
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Start with easy things to do. Throw a can of Sea Foam in a full tank and drive till it's near empty. Are you using premium, non-ethanol fuel?

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post #3 of 19 Old 12-23-2019, 10:15 AM
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What altitude do you live at?

What is your normal ambient air temperature during riding?

How much wind?

What is your engine idle speed, after fully warmed?

Quote the post & add your answers in the box.

My basic suggestion could be to open the idle mixture screw another 1/2 turn & adjust your fully warm idle speed to 1300 - 1400 rpm.

pdwestman
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post #4 of 19 Old 12-23-2019, 11:55 AM Thread Starter
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Quote:
Originally Posted by klr4evr View Post
Start with easy things to do. Throw a can of Sea Foam in a full tank and drive till it's near empty. Are you using premium, non-ethanol fuel?

.
I'll give that a try, now that I think about it, the carb might be a little gummed up, I've only been riding it every few weeks, but when I do ride, its usually 100 miles+ or so.
I use 91 octane, Probably Ethanol fuel now that it's winter.

Last edited by pablo.gyds03; 12-23-2019 at 12:04 PM.
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post #5 of 19 Old 12-23-2019, 12:00 PM Thread Starter
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Quote:
Originally Posted by pdwestman View Post
What altitude do you live at?

What is your normal ambient air temperature during riding?

How much wind?

What is your engine idle speed, after fully warmed?

Quote the post & add your answers in the box.

My basic suggestion could be to open the idle mixture screw another 1/2 turn & adjust your fully warm idle speed to 1300 - 1400 rpm.
Thanks for the suggestions,
62ft above sea level
Ambient temp around 60 deg Fahrenheit
Not much wind
Idle speed is around 1200 - 1300RPM
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post #6 of 19 Old 12-23-2019, 01:21 PM
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The KLR engine is one Giant aluminum Radiator all by itself. They can cool down enough to require the use of the cold start enrichener quite quickly in 60F temps.

Too many people make the mistake of opening the throttle when they should be ONLY using the cold start enrichener. By opening the throttle the air goes under the throttle plate instead of across the enrichener Jet.

And they also open the throttle before they put the starter motor in-motion with a warm engine.

Maybe you are playing with the throttle too soon with a warm engine? Allow the engine to make 2 full exhaust cycles (4 full rotations) before 'twitching' the throttle open on a warm re-start.

pdwestman
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post #7 of 19 Old 12-23-2019, 01:41 PM
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I predict itís a dirty carb and itís easy to clean...but youíve gotta do it right. Clear those blocked jets, scrub them needles.

And donít break the plastic enricher elbow while removing or reinstalling the carb.

There are two rules for being successful in life.

Rule 1: Never tell others everything you know.
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post #8 of 19 Old 12-23-2019, 03:51 PM
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Quote:
Originally Posted by pdwestman View Post
The KLR engine is one Giant aluminum Radiator all by itself. They can cool down enough to require the use of the cold start enrichener quite quickly in 60F temps.

Too many people make the mistake of opening the throttle when they should be ONLY using the cold start enrichener. By opening the throttle the air goes under the throttle plate instead of across the enrichener Jet.

And they also open the throttle before they put the starter motor in-motion with a warm engine.

Maybe you are playing with the throttle too soon with a warm engine? Allow the engine to make 2 full exhaust cycles (4 full rotations) before 'twitching' the throttle open on a warm re-start.
Just a minor correction or rather clarification...operating the throttle tube with the engine not running OR turning over via the starter motor the slide in the carb will not move. Engine vacuum only is what causes the carb slide to move up OR down. Your right wrist is only requesting the carb slide to move in either direction.

OP - Thumpers in particular can 'develop' a preference on how best to start them cold or hot. Yes, there are several items/conditions that influence how fast it will light off but as pdwestman stated let the engine get those four rotations before you might consider something is up. Often the case is a partially clogged pilot jet. It would be a good time to simply put in a new pilot jet and I would suggest going up one size...#42. Be sure and 'uncap' the fuel screw and adjust for 1 3/4 to 2 1/4 turns out. WIth a 42 and otherwise stock carb (assuming the snorkle has been pulled) I'd put it on the lower end of that range.
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post #9 of 19 Old 12-23-2019, 03:54 PM
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Quote:
Originally Posted by Dan Diego View Post
I predict itís a dirty carb and itís easy to clean...but youíve gotta do it right. Clear those blocked jets, scrub them needles.

And donít break the plastic enricher elbow while removing or reinstalling the carb.
Dan,
You have come a long ways in KLR Guru status when you correctly stated enrichner and not choke nut. KLR's don't have chokes lol
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post #10 of 19 Old 12-23-2019, 04:04 PM
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Quote:
Originally Posted by Chuck B View Post
Dan,
You have come a long ways in KLR Guru status when you correctly stated enrichner and not choke nut. KLR's don't have chokes lol
Ha! Iím very far from a guru...but Iíve become fairly decent at cleaning carbs.

Still working on the terminology, though...

There are two rules for being successful in life.

Rule 1: Never tell others everything you know.
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