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2000 CR250 Sputtering at High Speed

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The bike started doing this towards the end of my last ride and now I can't accelerate in 3rd, 4th, or 5th gear b/c the bike will sputter (not bog down) when I hit higher speeds. I took the carb off and removed the float bowl but I don't know much about working on carbs. Everything looked really clean and the 180 main jet (which I could see without pulling things apart) looked clean. The bike did this before I took the carb off and now it's doing the same thing since I have reassembled everything. It starts easily and has lots of power in 1st and 2nd. It has not always done this, but I've only had the bike 6 months and ridden it 10-15 times with no problem, so it's something new to me.

Here is what I know.

Fresh plug

Fresh gas (40:1)

clean filter and properly seated

V-Force reeds look new

Air Screw 1-1/2 turns out

180 main jet looked clean

fresh oil

new clutch cable

idles great

Here is what I don't know:

condition of clutch (I assume it's original)

needle clip position (don't know what to look for = still new to this)

What could be causing this? Is the clutch slipping? Is it something to do with the carb? If I had blocked hoses wouldn't it happen at slower speeds too?

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run a compression check and inspect the operation of the power valves

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Take off the stator cover, cover by the gear shifter, and check for water. the cover is metal and if you wash or hit alot of water with a hot engine condensation will occur. this happend alot on my rm 250. good luck

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The cover on mine is plastic. Are you talking about behind the plastic cover where the flywheel is, or am I thinking about the wrong thing?

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