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  #1  
Old 06-04-2013, 07:44 PM
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Default 300EX bugs out

My 300 ex will bog down when u try an go over 1/2 throttle. I have to ease into the throttle to even get it to try an rev up. When u give it full throttle it bogs and back fires
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Old 06-04-2013, 08:14 PM
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Have u cleaned the carb lately? Sounds like a dirty carb or maybee them valves r outa adjustment.
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  #3  
Old 06-05-2013, 06:53 AM
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Ive tooken the carb off and the rollers are warn out but the vavles are tight. We reshaped the rollers so it doesnt knock anymore. Could rings have say in this? the rings are bad in the wheeler cuzz it smokes like a bad habbit LOL
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Old 06-05-2013, 07:07 AM
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Default OK

Ok, sounds like low compression to me.

Paw Paw
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  #5  
Old 06-05-2013, 07:44 AM
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Thats what i was thinking
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  #6  
Old 06-05-2013, 08:22 AM
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Go to hondaatvforums and download the free service manual.....there is a huge wealth of information on that site pertaining to the 250x/300ex....I personally own a 2002 300ex and a 87 250x.....great machines...for wheelers that is...if its time for a new top end ...change the cam chain while u r in there it not worth the risk of it stretching or snapping...check the rockers and cam lobes for wear...
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