HELP!! 94 CR250R

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3/15/2018 10:05 AM

My brother picked up a 94 cr250. The bike bogs in low rpms with no power but once we hit the power band the bike rips..

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3/15/2018 10:06 AM

In.

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3/15/2018 10:07 AM

lulz

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3/15/2018 10:08 AM

Keep her pinned, problem solved.

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"Sorry Goose, but it's time to buzz the tower."

3/15/2018 10:10 AM

Check your reeds

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If you like uncle tony's meatballs, you'll love his sausage

Now that's Italian

3/15/2018 10:12 AM



This should help.



And this...
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3/15/2018 11:00 AM

Donovan759 wrote:

In.

Thanks bud I appreciate the help.

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3/15/2018 11:03 AM

Uncle Tony wrote:

Check your reeds

Will do. Thank you sir.

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3/15/2018 11:06 AM

Clean air filter?
Clogged silencer?
Air screw ( should be around 1.5 out)
Reeds..

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3/15/2018 11:11 AM

pummel wrote:

Clean air filter?
Clogged silencer?
Air screw ( should be around 1.5 out)
Reeds..

Whats the best way to figure out if the silencer is clogged.. and sorry but have not been riding bikes for long, is the air screw the small brass flat head screw on bottom right of carb looking at it from left side of bike?

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3/15/2018 11:14 AM
Edited Date/Time: 3/15/2018 11:16 AM

What you describe sounds like a typical 2 stroke, however it's very likely this bike has an aftermarket powerband, which are very fickle. I would revert back to the factory powerband. You can find the correct powerband part number on the Honda parts microfiche. It's on the same parts diagram as the muffler bearings.

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3/15/2018 11:16 AM

pummel wrote:

Clean air filter?
Clogged silencer?
Air screw ( should be around 1.5 out)
Reeds..

03cr250rhm wrote:

Whats the best way to figure out if the silencer is clogged.. and sorry but have not been riding bikes for long, is the air screw the small brass flat head screw on bottom right of carb looking at it from left side of bike?

Repack your silencer, check your pilot jet, it can bog because its too small or clogged. does it run better with the choke on at low rpms? yes the brass screw is the air screw its on the intake side towards the airboot.

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3/15/2018 11:21 AM

pummel wrote:

Clean air filter?
Clogged silencer?
Air screw ( should be around 1.5 out)
Reeds..

03cr250rhm wrote:

Whats the best way to figure out if the silencer is clogged.. and sorry but have not been riding bikes for long, is the air screw the small brass flat head screw on bottom right of carb looking at it from left side of bike?

ratonmacias wrote:

Repack your silencer, check your pilot jet, it can bog because its too small or clogged. does it run better with the choke on at low rpms? yes the brass screw is the air screw its on the intake side towards the airboot.

I will try it with the choke later today. Thank you i apreciate the serious response.

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3/15/2018 1:19 PM

Check for a stuck power valve.

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3/15/2018 1:26 PM

JB 19 wrote:

Check for a stuck power valve.

Bingo!

Also if the cylinder has been off there is a pin (if I am remembering correct) that has to be lined up with the arm that works the powervalve. If that is not aligned, it can be stuck open and you will have little low rpm power.

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Take it to the limit, one more time!

3/15/2018 1:28 PM

JB 19 wrote:

Check for a stuck power valve.

This.


Also check your carb, clean it completely. Make sure the main needle jet is opening and closing and 'seating' correctly. If there is a groove on the rubber needle replace it. Replace both the pilot and main jet, they're cheap.

Check the reed's, make sure they aren't chipped or cracked. Also make sure the reed cage is sealed and not sucking in air. (this is a big one)

On a lower probability if you can swap coils with another CR250. Sometimes the coils go bad and act funky at different RPM's until they finally die.

On the far low end, a clogged silencer with gooey packing can severely restrict a 2 stroke too.

Fresh gas? 32:1? Fresh spark plug gapped properly? Clean air filter? These are also potential issues. Make sure the tank is clean and free of debris, same with the fuel line. You'd be surprised what a couple specks of dirt can do to an engine.

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3/15/2018 1:58 PM

The power band you are describing is the reason why four strokes took over.

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3/15/2018 3:45 PM

Motocross Kid wrote:

What you describe sounds like a typical 2 stroke, however it's very likely this bike has an aftermarket powerband, which are very fickle. I would revert back to the factory powerband. You can find the correct powerband part number on the Honda parts microfiche. It's on the same parts diagram as the muffler bearings.

laughing laughing
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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
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3/15/2018 4:38 PM

Just ride it wide open.

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GP740
Since 1987

3/15/2018 5:34 PM

Also, check your compression.

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Take it to the limit, one more time!

3/15/2018 11:13 PM

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3/15/2018 11:16 PM

To the non serious replies in this thread... thank you.. thank you from the bottom of my heart. Lol

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3/15/2018 11:53 PM

JB 19 wrote:

Check for a stuck power valve.

mx317 wrote:

Bingo!

Also if the cylinder has been off there is a pin (if I am remembering correct) that has to be lined up with the arm that works the powervalve. If that is not aligned, it can be stuck open and you will have little low rpm power.

Very much yes...there is a shaft that runs vertically from the base of the cylinder to the power valve on the front right corner. It has a forked plate at the bottom that catches the pin from the cases. There is almost no way to line it up when putting the cylinder on unless you disconnect to top from the power valve as it’s preloaded by the spring when installed, making it refuse to align as the cylinder comes down onto the cases. I only remember this because I ruined two of them back in 93 before I figured it out. Not only does it stick the power valve, but tightening down the cylinder (which it will let you do without much resistance) with it misaligned will bend the fork. Trying to bend it back causes a crack due to the plate being hardened. They were 60.00+ apiece back then...

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3/16/2018 12:06 AM

id bet money its the ECU

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3/16/2018 12:09 AM

rongi#401 wrote:

id bet money its the ECU

Needs a works unit? Lol...

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3/16/2018 12:20 AM

It's a 125 with 250 stickers. You've been duped

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3/16/2018 12:38 AM

As been said check and clean the power valves. Carbon can build up around the exhaust ports and make them stick also.

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