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Discussion Starter #1
my friend just got a 86 ninja 250r for 700 and he rode it around for couple of days but for like a day he rode it with the choke on, since than the bike barely moves at full throtle it goes like 5 mph in first gear ant has a really bad knocking sound and he would sell it to me for 200,
can anyone help me figure out what it could be? it sounds like a really really bad piston slap on a car.

TANX
 

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Discussion Starter #2
also when it starts and the choke is on it jumps up to 4000 to 5000 rpm and stays there. if you lover the choke it dies.
 

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AZ's Official Mechanic
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start by replacing the plugs. then change the oil. you may have diluted the oil with gas and now you have a ROD KNOCK. do the other things first before jumping to conclusions.
good luck :wink:
 
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