Kawasaki lakota 300 backfires & coughs above idle running rich - Kawasaki ATV Forum
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post #1 of 7 Old 01-06-2011, 09:26 PM Thread Starter
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Kawasaki lakota 300 backfires & coughs above idle running rich

Hi,
I'm a newbie here. I have a 2001 Lakota sport that backfires and coughs above idle. I have adjusted the valves, cleaned the carberator, checked the diaphram in the carberator, made sure the choke is closing. It idles fine but as soon as you give it gas, it pukes black smoke. It gets worse as it warms up so I know that it is running too rich. I have researched this online. It seems to be something that stumps a lot of people but I have not found any solutions online. Any help would be appreciated.
The bike might have 20 hours on it. It sat for a while. I got it from the original owner with no mods. It is totally stock.
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post #2 of 7 Old 01-07-2011, 07:17 AM
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Running lean can cause a black smoke. Usually rich conditions produce more of a gray smoke....have you smelled it, does the exhaust smell like gas?

To be honest it sounds more like a lean condition to me. The stock carb works on a vacuum. Pushing the throttle opens up the air first, and as airflow increases it pulls more fuel in (which causes a slight delay in throttle response and is why people commonly replace the stock carb with one that has an accelerator pump). In your case, it would mean that when the valve opens to increase airflow it never has a chance to suck more fuel because your mixture goes super lean and the engine can't keep running and pulling it in.

If it's too rich, it should be an easy fix. It can only get fuel from one place...your tank. You just need to reduce the amount that is being delivered. Change your jets, check your float level, and make sure your air filter is clean.
Being too lean is a much more common problem and a much more difficult problem to find because the engine's source for air is everywhere and sometimes it pulls from places you don't want it to.

You said that you checked the diaphragm and cleaned the carb. Have you checked the O-ring between the carb holder and the cylinder head? Also, check the petcock/fuel line to make sure fuel delivery is sufficient. Your float level is a good place to look as well (whether lean or rich). If it's too high it'll dump fuel into the carb, if it's too low the jet won't be able to pick up fuel at all. Do you know what jet sizes you currently have in your carb? Also, if it's running rich it should run better without the air filter. If it's running lean it should run worse without the air filter. In either case, make sure it's clean.

Last edited by Timberwolf 8199; 01-07-2011 at 07:24 AM.
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post #3 of 7 Old 01-07-2011, 05:39 PM
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You also said it was sitting, how long have you ran it after you cleaned it up? If not for long there could still be dirt/something in the motor like oil making it do that. But timberwolf was dead on thats what i would check if you have run it for more than 20 minutes. Also my mojave would get tons of oil in the airbox if i overfilled it and make it smoke, but it was more of a grayish smoke

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post #4 of 7 Old 01-09-2011, 08:50 PM
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Have you checked the valve lash? If it gets worse as it warms up it could be the valves not seating properly and causing it to load up the cylinder and possibly fouling the plug. Lakotas are jetted a little rich from the factory because they are air cooled and it helps them run a tad cooler. I would definately give a check. It is really simple to do. Might as well rule it out. Then you can move on to other causes, like a dirty air filter or over oiled filter.

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Last edited by jonboy; 01-09-2011 at 08:56 PM.
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post #5 of 7 Old 01-10-2011, 07:21 AM
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good call jonboy, thats a definite possibility.
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post #6 of 7 Old 01-12-2011, 08:34 AM Thread Starter
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In my 1 post i stated i ajusted valves but thank you for the help. I sold it life is to short.

Thanks again Guys
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post #7 of 7 Old 03-05-2011, 02:23 PM
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I have the same machine, and it would backfire when i applied gas. i had a cam-shaft that got rounded off on the exhaust side and when it spun around the exhaust was trying to go out threw the intake. pull out the cam shaft and inspect it
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