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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> No acceleration
Post Info TOPIC: No acceleration
Hemi


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No acceleration
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Hi guys, first post for me, I have a 1996 ttr250 open endure as a farm bike. I have had an issue with it since I got it, it will start and idle perfectly, it will rev up in neutral no worries but as soon as I put it under load I can't get past maybe 10% throttle and it dies like it's getting too much air, let the throttle go and it returns to idle no issue. I thought it was the carby giving me hell and I managed to find a brand new carby and installed it and still the same. I have read about the intake manifold leaking (yet to check it) but I am also wondering could it be a plug or coil issue.  I have no history on the bike, it was in bits when I got it.. thanks



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TTRfan


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A more unusual fault which gave similar symptoms was on a TTR which had a worn timing chain which had jumped a tooth on one of the the cam sprockets.

Unlikely I know but worth a check.

Another unusual fault was the spark plug cap where the internals had destroyed themselves. 

Brian



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MichaeltT


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my bike would rev and idle fine but it would not pull above 25 to 30 mph turned out the accelerator pump diaphragm was completely gone stripped cleaned new diaphragm pulls like a train now

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