2010 HONDA CRF250R WILL RUN BUT NOT WELL AND WILL NOT IDLE

Edited Date/Time 9/30/2023 10:32pm

Since I had gotten this bike about a year ago now, I have replaced a TPS sensor, fuel pump, fuel injector, kill switch and tested continuity through all the wires. Everything was replaced with oem parts yet the bike still won’t run right. Anybody got any ideas on what else it could be? Any helps appreciated. 8934A8CA-1917-4AF0-BCAF-6196AAC1F143.jpeg?VersionId=c6SkS4.xNMkxJg9Jv0

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dadofagun
Posts
2057
Joined
3/28/2015
Location
Satan's Hollow, OK, USA
Fantasy
9/30/2023 9:55pm

Off the top of my head,  (which doesn't contain much,  for reference....)  You have a 13 year old 250F,  that has probably kicked the ever loving shit out of the rev limiter at least twice in it's life, maybe 3 or 4 times just to be safe.  Quit tossing money at electron oriented stuff, and start looking at the heart of the matter, AKA, it's guts....  Valves, compression,  the plug, airflow into the engine, etc.  basic shit.....  Having a well used bike of it's age, and nature, does NOT cure all with  a modest amount of OEM parts unless it has had a life of a garage trophy, and nothing less.  Even then, a race bred bike is needy of attention..... Always.  Start by getting a service manual for your bike, and follow it looking for your troubles.  A modern 4 st is quite complex, take your time.  And open your wallet, when it allows......

 

1
ando
Posts
4616
Joined
8/20/2009
Location
Perth, AU
9/30/2023 10:21pm

Checking valve clearances would be my first priority.  

10/6/2023 3:42pm
dadofagun wrote:
Off the top of my head,  (which doesn't contain much,  for reference....)  You have a 13 year old 250F,  that has probably kicked the ever loving...

Off the top of my head,  (which doesn't contain much,  for reference....)  You have a 13 year old 250F,  that has probably kicked the ever loving shit out of the rev limiter at least twice in it's life, maybe 3 or 4 times just to be safe.  Quit tossing money at electron oriented stuff, and start looking at the heart of the matter, AKA, it's guts....  Valves, compression,  the plug, airflow into the engine, etc.  basic shit.....  Having a well used bike of it's age, and nature, does NOT cure all with  a modest amount of OEM parts unless it has had a life of a garage trophy, and nothing less.  Even then, a race bred bike is needy of attention..... Always.  Start by getting a service manual for your bike, and follow it looking for your troubles.  A modern 4 st is quite complex, take your time.  And open your wallet, when it allows......

 

Thank you will look into it

POWLEY256
Posts
116
Joined
3/11/2018
Location
GB
10/7/2023 11:35am

Most likely the stator. Having the same issues with my dads old 2010 crf. 
 

The Shop

10/12/2023 6:40am
POWLEY256 wrote:

Most likely the stator. Having the same issues with my dads old 2010 crf. 
 

Was thinking that to

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