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Yamaha blaster wont rev up sputters past 1/4 throttle

I have been trying to help a buddy out with his blaster it has a stock motor , air box delete just a filter off the intake, has a full fmf pipe and expansion chamber. ive alreadly done a dynojet carb kit with a 360 jet, ive tried multiple jets to see what would work no change in problem, ive replaced every part in the carb, deleted the oil injection and pre mixed fuel. and ive completey replaced carb with another one and still no change . also replaced plug

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  • Douglas Hansen
    Douglas Hansen Jul 10, 2010

    You don't mention what the problem is??????

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I tipped over my Rincon atv and it won't start.


Hey Deav,
If you have fuel injection, I think you do have a "tip-over" or angle switch..(they will keep running upside down)..IF NOT - Sounds like you may have filled the engine with gas and possibly flooded the air filter also.....- when you tip it over, there is nothing to stop the fuel from flowing through the carburetor vent systems and into the intake tract (engine and air filter).. when this happens it floods so bad you have to remove the air filter and spark plug.. then spin the motor over.. make sure the air filter is clean and dry..
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Fuel starvation (supply or wrong carb or tune) and/or insufficient or poor quality spark.

Make sure the air filter is clean and only test with it connected as it sometimes makes a lot of difference. It could be worth checking the exhaust for blockages.

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My 2000 Yamaha blaster 200 runs good at half throttle but bogs after half throttle


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1 Answer

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Check that the breather in the fuel cap is still working. The breather has a hose with a one way valve.
You should be able to blow air in but not out. I hope that you are moving during that 1/2 hour as these motors require air flow for cooling.

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Howdy.I have a 2005 yamaha blaster.Low hours,good spark and freesh fuel.Fired it up the other day and was fine for about 5 min.Then it seemed to loose power then died.I checked fo fuel and spark , bot


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1 Answer

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The VTX 1800 is fuel injected which requires the additional sensors (oxygen, throttle position, etc). However the VTX 1300 is carbureted, which takes the sensors out of the equation. If you are changing the exhaust with a:
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1 Answer

My blaster runs good but once it gets hot it revs up and wont stop i cant stop it with the run switch or the key i block the air to turn it off i put a new plug in it it has the oil pump off i mix the gas...


Sounds like an air leak... either at the base gasket or the reed valve gasket. or the carb/reed intake boot...MAYBE THE HEAD GASKET...

...AND ... get a qualified pro to look at your carb..tell him which parts you replaced...

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1 Answer

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I would check the plastic heat isolator between the carb and cylinder head for leak.

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