KX250F 2012 Fuel or Engine?

suzkaw250
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5/7/2014
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Glenwood, MD, USA
suzkaw250
Edited Date/Time 7/23/2014 8:24pm
So I completed top/bottom end rebuild. Broke in the new top end at home with all new fluids and spark plug. Went to Blue Diamond MX park today for 1st ride, man was it hot and humid. The bike started on 3rd kick rode for 20 minutes all was good. Ditto for round two but the third time out the engine was acting up. It was backfiring on acceleration and decel, it would bog when you hit the throttle then suddenly rev, in higher gears it would sometimes have no throttle response. I am at a lost I didn't touch the fuel system during rebuild and before rebuild there was no problems. It sounds like EFI or old gas but then why was it OK for two thirds of day. Any suggestions?
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Rickiells
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7/19/2014
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Byron, CA, USA
Rickiells 7/23/2014 8:24pm
7/23/2014 8:24pm
suzkaw250 wrote:
So I completed top/bottom end rebuild. Broke in the new top end at home with all new fluids and spark plug. Went to Blue Diamond MX...
So I completed top/bottom end rebuild. Broke in the new top end at home with all new fluids and spark plug. Went to Blue Diamond MX park today for 1st ride, man was it hot and humid. The bike started on 3rd kick rode for 20 minutes all was good. Ditto for round two but the third time out the engine was acting up. It was backfiring on acceleration and decel, it would bog when you hit the throttle then suddenly rev, in higher gears it would sometimes have no throttle response. I am at a lost I didn't touch the fuel system during rebuild and before rebuild there was no problems. It sounds like EFI or old gas but then why was it OK for two thirds of day. Any suggestions?
Exact same thing happened on my 2014 CRF250F practice bike at around 30 hours on the bike. Suspected it was the fuel pump acting up so I installed a new one and it hasn't happened since that one time.

Even though that alleviated the problem, one other culprit could have been the fuel filter on the pump. That would be a cheaper place to start, but I didn't have to go there because my boss wanted me to just put a new pump it it which come with a new filter.

Let me know if that helps.

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