Question about 1987 Honda XR 250 R

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Hi, I have a 1980 Honda XR250. The compression is around 120 (with decompression disconnected). It blows smoke and will not rev high - I assumed carb dirty, cleaned it but still reluctant to go to high revs. Any advise welcome !

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Might be a good idea to check your timing first and then if the timing is ok try removing your exaust pipe and running it for a few minutes without the exaust system installed. I have encountered a couple of bikes where the exaust system has carboned up and will not allow the engine to breathe especially at hiogher rpms. A day in the gunk tank for the exaust pipe did the trick and the bike ran like new. (Gunk will remove all the paint too)

Posted on Jan 22, 2013

Testimonial: "timing checked, one inlet and exhaust valve tight, and one blocked exhaust pipe - challenge is fining a pipe now"

  • Andrew Foster Apr 07, 2013

    yep the pipes were blocked (collapsing baffles etc) - these were repaired and runs a damned sight better now, but one header pipe heats faster that the other. I painted the headers with hi temp paint one pipe burnt the paint off, the other is still good. would that be a beurnt out exhaust valve causing this ???

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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: 1980 honda cx500 will sart with the chok pulled

This sounds like the main jets are varnished up and possibly the float(s) are sticking. Pull the carbs off the bike and clean them with carb cleaner. Remount the carbs then balance and sync them. On a bike that old I would spring for carb rebuild kits. The kits MAY have additional parts for other carbs along with yours. Just use the parts that match the ones from your carbs.

Posted on Mar 17, 2009

  • 2 Answers

SOURCE: i have a honda magna vf750 the no1 carb keeps

there is a liquid you can buy it is called seafoam, I had the same problem I put it in my gas, ran the bike for 5 minutes , everything worked fine

Posted on Apr 16, 2009

  • 3567 Answers

SOURCE: i have a honda magna vf750 the no1 carb keeps

Drain the carburetor. There should be a screw on the lower side of the carb float bowl. Remove the screw then replace it after the fuel drains. Turn the gas back on and wait a minute for the carb to fill with gas. Start the engine. If the bike doesn't start and run properly then shut off the gas and remove the carburetor from the engine.

Remove the float bowl and clean the entire carb with a spray carb cleaner from the auto parts store. Wear protective goggles to avoid getting spray in your eyes. Spray into all the little airways and fittings in the carb.
clean the air filter and install the carb. Let the float bowl fill then start the engine.

Please rate this solution. Thanks!

Posted on Apr 16, 2009

  • 245 Answers

SOURCE: i have a honda CB400 super four and have been having a slight pro

Your carb may be adjusted a little lean. Try adjusting the needle, keeping track of the changes you make, and blipping the throttle full to check the result.

Posted on Jul 28, 2009

mwoodring1
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SOURCE: 2001 Honda Shadow ACE 750 idles, but won't rev up

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