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  #1  
Old 05-10-2013, 07:27 PM
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Unhappy KX 85 Wont kick start but will bump start

     

Hi, I'm new on here so this might not be the right forum for this question. I have a 2001 kx 85cc. The bike wont kick start but it will bump start and runs amazingly. It will only kick start after the engine is at running temp. It wont cold start. I have cleaned out he carburetor and jetted it properly; so the bike isn't running too rich or too lean. The compression is fine, the plug is sparking;(and yes I have tried a ton of different plugs). The bike is getting enough gas to start but it just wont. I can not figure this out for the life of me! If anyone has any ideas it would be greatly appreciated.
Thanks!

Last edited by Derc; 05-11-2013 at 11:18 AM.
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Old 05-10-2013, 09:05 PM
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Default ???????

Do a compression check before you do anything else. I feel like it will come in low, but if not then that will give us a direction to help.

Paw Paw
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Old 05-11-2013, 11:17 AM
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I do not own a compression meter, but I've done the old put your thumb over the piston and have someone kick it test. Every time it blows my thumb clean off. So it should be okay right?
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Old 05-11-2013, 11:32 AM
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There is no substitute for a compression guage. All the blowing of the thumb off the hole shows is that there is "some" compression, but that will happen even with very low compression.
Low compression would explain a lot in this case.

Paw Paw
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Old 05-11-2013, 11:49 AM
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I like what Paw is telling you. I know you said the critter is jetted perfectly ( I LOVE THAT CLAIM) and that you cleaned the carburetor. You may want to set the float too if you actually want your carburetor to have a complete tuneup. If you think you have enough compression and that it must be something besides the carburetor start looking for air leaks. you say it starts warm, but not cold. if your engine is otherwise healthy and someone tells me that I think that it is running lean. I know, I know, you are sure it isnt. an air leak makes them run lean, a carburetor slide that doesnt come down all the way or or an idle that is set too high will render the enrichenor kind of useless. you may want to make sure the slide bottoms all the way, and even try going in on the air screw until it is only turned 1/4 to 1/2 a turn out.
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Old 05-11-2013, 03:36 PM
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Actually you were spot on with the problem. The idle was set too high for it to kick over. After I ran it down my hill to get it going,I turned the air screw in all the way then out a 1/4 turn like you said. Then adjusted the throttle so it idled right. It definitely was lean. I waited a couple hours for it to completely cool down, then gave it a couple kicks and it started right up I guess I had it in my head that the problem was more severe.

Thanks everyone for the help!
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