all the sudden- running too rich - Kawasaki KLR 650 Forum
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post #1 of 13 Old 11-06-2011, 07:35 PM Thread Starter
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all the sudden- running too rich

11K miles ago I did all the carb mods, running great, no problems. The day after a normal 100 mile loop (gravel and dirt roads, with pavement to get me there), when I started my bike it stumbled, started missing and died 100 yards from my driveway. I pulled the body work and checked the plug, it looked great, good spark. The Uni air filter was clean (and just cleaned), So I checked fuel flow,checked all vacuum lines and vents, pulled and cleaned the carb, triple checking everything, diaphram good, was no dirt in the carb but I really cleaned it, set float at 17.5mm, so carb should be good, drained and put in new gas. Inside tank screen clear and clean. Pulled coil, inspected cap and wires/ground. after each of these steps, the enginge would start and idle for 30 seconds ok, but any throttle will make it miss and hesitate, If it goes above 3000 rpms, black smoke from the exhaust, the new plug will not be wet, but is covered black soot. Why is it running so rich? What am I missing?

Last edited by Shaun; 11-06-2011 at 07:37 PM.
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post #2 of 13 Old 11-06-2011, 08:07 PM
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10 to 1 there is a clog in your main jet
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post #3 of 13 Old 11-06-2011, 08:23 PM Thread Starter
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Originally Posted by Crazy Jake View Post
10 to 1 there is a clog in your main jet
Main is clean, looked 3 times at it, so is holder tube, with jet out I can see the slide bore. If the jet was clogged it would be lean. Its running way rich. black smoke, can smell the gas. I put a clear line on the bowl drain, opened the drain valve and the carb fuel level is at top of float bowl where it meets the carb body. So float should be correct.
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post #4 of 13 Old 11-06-2011, 08:59 PM
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Have you checked to make sure your needle hasn't moved?

Mark
"My KLR belongs to God, when he wants it clean he washes it."
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post #5 of 13 Old 11-06-2011, 09:24 PM
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Quote:
Originally Posted by Shaun View Post
11K miles ago I did all the carb mods, running great, no problems. The day after a normal 100 mile loop (gravel and dirt roads, with pavement to get me there), when I started my bike it stumbled, started missing and died 100 yards from my driveway. I pulled the body work and checked the plug, it looked great, good spark. The Uni air filter was clean (and just cleaned), So I checked fuel flow,checked all vacuum lines and vents, pulled and cleaned the carb, triple checking everything, diaphram good, was no dirt in the carb but I really cleaned it, set float at 17.5mm, so carb should be good, drained and put in new gas. Inside tank screen clear and clean. Pulled coil, inspected cap and wires/ground. after each of these steps, the enginge would start and idle for 30 seconds ok, but any throttle will make it miss and hesitate, If it goes above 3000 rpms, black smoke from the exhaust, the new plug will not be wet, but is covered black soot. Why is it running so rich? What am I missing?

My guess: a broken piston ring or bad valve guide.

If you were flooding out the plug would be wet. Same with an electrical failure wet plug. Soot on the plug and black smoke is oil burning.

How many miles on the bike? Have you gone over the wiring harness? There could possibly be something weird going on with it I guess.

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

Last edited by Spec; 11-06-2011 at 09:32 PM.
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post #6 of 13 Old 11-06-2011, 10:51 PM
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Would think burning oil would be blue smoke. choke/enricher not closing off or weak spark under compression. just thoughts
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post #7 of 13 Old 11-07-2011, 11:25 AM Thread Starter
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13300 miles, no abnormal engine noises. Im 99% sure the carb is clean, void of defects, It might be hard to check without removing sub frame/airbox, but what if the slide was not opening when the butterfly does? And what would cause that? That would make it run like it is, but diaphram shows no tears/holes, slide moves very easily in carb bore. It could be a valve/ring issue, but I hope not. I have always considered myself a compitant garage wrench, BUT I gonna have to take it to a pro, I ride everyday and Im stuck in my cage!
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post #8 of 13 Old 11-07-2011, 11:28 AM Thread Starter
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Im gonna by a fresh plug wire and cap on my way home tonight. I checked coil ground a connections, no resistance on plug wire, always use dialectric grease on connections.
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post #9 of 13 Old 11-09-2011, 09:10 AM Thread Starter
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After ruling out carb and coil. Decided to check IC igniter/ crankcase sensor. Manual has kinda lost me in translation, so decided to start with timing check/ advance. Hooked up timing light, removed inspection cap. When I started the engine and peared into the hole with the light, I got a face full of oil mist. Blowing out a lot of pressure, oil on the floor 4 feet away. Checked the crankcase vent tube/ airbox for retrictions and its clear. I do believe I have an internal issue. ARGH!

Last edited by Shaun; 11-09-2011 at 10:30 AM.
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post #10 of 13 Old 11-09-2011, 06:46 PM
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Some pressure in the crankcase is normal.
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