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Yamaha kt100 kart

The karts fuel runs through a fuel line, which the fuel is gravity feed into the engine but, the fuel doesnt seem to run through the line, what could cause the fuel not to be gravitated towards the engine?

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I've never seen a KT100 before, but i've worked with similar engines.
The fuel isn't gravity fed. It uses a pulse pump system using diaphragms in the carburettor to sort of "**** and blow" the fuel using pressure impulses and valves to stop the fuel going backwards.

The first place you should look is if there is a short pipe from the crankcase to the carb so that the pressure pulses from the case can move the diaphragms. You should be able to see this from some pics on google images. If thats all ok, you should check if the carb is perfectly clean. If its still giving you problems, change the diaphragms in the carb. You should be able to get a replacement rebuild kit from a dealer.

Posted on Jan 06, 2009

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You need to pump the fuel into the engine the first time you start it. Choke the engine by putting your hand over the airbox holes while you turn the engine over. You should see the fuel moving towards the carby. Kaep doing this until the engine starts and once it starts remove your hand from the airbox.

Posted on Aug 31, 2010

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Can i ?
and how 2 fix the black box igntion on a kt 100j engine thanks luke

Posted on Jul 02, 2010

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The Karts fuel is not gravity feed, it is actualy pumped in to the engine by the carb. . Sounds like you need to rebuild the carb.

Regards, Mike

Posted on Jan 12, 2009

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