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5/26/2018
Location
Rochester, NY
US
SAINT1000
6/7/2019 7:55am
6/7/2019 7:55am
i have a 2003 cr250r that my son uses for mx. it has pc pipe and silencer, vforce reeds, pwk carb. the bike has always ran flawless. last sunday he was racing and it was muddy. it ran beautiful most of the day and in the last heat it developed a hesitation and skip in the mid rpms. i tore everything down, new air filter, cleaned carb which is brand new 2 months ago(only has about 5 rides on it), replaced reeds and gaskets, resealed air box, new fuel filter, new plug, and it still does it. jetting was always very good with this carb setup. i pulled the rc cover and the valve is full counter clockwise at idle , but the valve twitches at idle, and doesnt open consistantly at rpm. when the rpms come up the valve twitches more, every once and a while it will go full clock wise most of the time not. i pulled the cables and they move fine, the butterfly turn with very little effort. which way is open and closed on this.mine is ccw at idle the twitces clock wise. here a some videos of the valve
rc valve
rc valve 2
rc valve
rc valve 2
No matter what, if he loves the frame enough, (NOTHING whips or handles like a honda) I loved mine, all three of them, and had planned to buy another one to do the old gen swap, but ended up thinking that taking half the strokes and 200cc's off a crf450r sounds like fun. So I switched tactics
Hopefully someone with some real knowledge on testing the ecu's as Iv never had to do anything like that before, will see this and give some more insight to the possible issue, but from my experience with these engines have been the servo motors life spans are comming to an end, lots of use or little use, they are all aging, and time takes its toll on electrical components, its next to impossible to stop copper cores from oxidizing over time
The Shop
There must have been a heck of a lot
More people doing this kinda stuff in the states, I know there was a business I think in Oregon, that offered a motor rewind service, but it was pretty expensive, and logistically, cheaper for me to just buy one from Honda. This was probably aboot 8 years ago though, and I definitely wasn't looking on here at that point lol. Ima look around a bit, this is a game changer
The CBR electric motor will fit in the CR250 case. Remove the CBR600 motor from the CBR case and install in the CR250 case..
You use the stock CR250 plastic gearing.
While you are swapping motors, be sure to seal the wire bundle where it enters the case with your choice of sealant. Add a little sealant to the case halves to supplement the sealing of the O-ring.
The CBR600RR servo uses the same Sumitomo connector that Honda specs for the CR250.
Problem solved.
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