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Sparkplug is getting dirty fast - Dakar 200 Yumbo Motorcycles

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Hi and welcome to fixya,

Looks to me like a bad fuel-air mix.. You'll need to lean out your mixture. Try 3 turns out from full close. This adjustment is not the idle knob. Its a straight bit brass screw on the carbuerator that would look like a needle when you unscsrew it off.

Hope this helps

Posted on Dec 29, 2010

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is it a diesel or petrol.there are a few possebilities that cause this problem.dirty filters air and gas filter.old sparkplugs or old sparkplug cables.does the airfilterhouse has summer&winter possition?
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There were a number of problems with V=8 engines in this Series. Some of the sparkplugs would try to leave the engine on their own. You need more testing to know what is wrong.

I will try to explain. The trouble Codes generated by your Onboard computer can be too general to identify a specific part for some problems.

There are 3 causes for a misfire. Fuel, spark, and compression. You can have fuel injectors which are dirty or have bad connections or coils and fail to open consistently. Spark issues are more complicated to diagnose as coils are now attached to individual sparkplugs(some models) and are triggered by Crankshaft and Camshaft sensors. A bad coil-pack feeding each bank of sparkplugs can short out adjacent plugs like #3 and #4.

Compression problems between #3 and #4 cylinders from a bad head gasket can cause misfires.

You can get a loaner test kit for the fuel injectors or use a test light or multi-tester. This will eliminate or confirm the fuel injector circuit as the problem.

There are cylinder balance tests that are non invasive when done with a good scanner. Otherwise removing the sparkplugs will be required to do a compression test.

Sparkplugs leaving the engine: They either unscrew or rip out the sparkplug hole. Loose plugs will misfire. BUT there is a problem with removing sparkplugs on these Series of motors. The factory plugs are 2 pieces welded together. Carbon buildup causes the sparkplugs to come apart as they are removed. Use solvent every 1/4 turn, let set for first 2 twists.

There was a Recall on these motors, but a Mileage limit and a time limit of about 7 Years was imposed. Check Internet for articles about all of these subjects, photos, etc.

Please rate my info.

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there might be some sparkplug issues, too much fuel less burning. try replacing your sparkplugs. this may help

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Grab at the base of the wire and pull them out. Im not quiet sure what you are asking. If you have 4 cyl you will have 4 wires 6cy 6 wires.

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