Question about Honda CR 125 R Motorcycles

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I have a 1985 cr125 just replaced the head gasket and lower gasket now it wont run ive rebuilt the carb has good compression and its getting fuel into the combustion chamber. well run the first time when kicked then dies after 20 seconds even reving it up or iding.. any ideas

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  • Honda Master
  • 1,190 Answers

Possibility that even though you have good compression the pressure below the piston is possible leaking past the crank seals ! weak draw on fuel in !

Posted on Feb 17, 2014

Testimonial: "changed the crank gasket same problem. going to try new reeds and new rings"


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Posted on Jan 02, 2017

  • 3567 Answers

SOURCE: 2005 250 f 65 kicks to start

Several things can cause the problem. First, spring for a new spark plug. The stock plug is NGK CR8E. Now the plug is eliminated as a problem. Next, pull the slide out of the throat of the carb. Now remove the jet needle. Put the needle clip on the 4th notch, (this is the stock setting). Use only premium gas. Next, follow the starting instructions below.

There is a proper way to start the engine. Four controls are on your bike to assist in starting.

  • The choke, used when the engine is cold. Pull the red knob for choke.
  • The " Hot Start " Lever, used when the engine is hot. Pull the lever to lean the fuel mix when the engine has been running.
  • The de-compression lever, always used.
  • The throttle, used to prime the cylinder.
Don't kick, instead, push the kick lever downward. You will feel the back pressure as the piston is going upward on the compression stroke to the point the pressure is great enough that the kick lever "locks up". You are very close to TDC. NOW, pull in the de-compression lever. Push the kick lever a little bit more to get the piston past TDC. Give the throttle a 1/4 turn then let it snap closed. A diaphragm in the carb gives a shot of gas when this is done. DO NOT do this multiple times because you will flood the engine. Leave the throttle closed when kicking. Release the de-compression lever and give a strong kick through the full sweep of the kick start lever. Quickly get your foot off the kick lever at the end of the kick to avoid any chance of "kickback" from a backfire. It can be very painful, and can even break a leg. I am serious about that. Repeat the process (but without the throttle priming), until the bike starts. A good battery and clean air filter will also aid in starting.

This will likely tame the beast for you. Please rate this answer. Thanks!

Posted on Jun 06, 2009

  • 20 Answers

SOURCE: NSR 125 ran out of two stroke oil and got hot,

Sounds like you have very little compression. Or a reed may be broken.. Make sure reed cage is tight an not sucking air... Id go with the compression test tho..

Posted on Jul 07, 2009

  • 3567 Answers

SOURCE: hi i have a cr125 on a 96 it starts with a bump

You may need a carb kit. Sputtering is usually one of two things. 1) bad seals in the carb, install a kit.

2) water in the fuel.
Clean the pitcock water trap, check the air cleaner, drain the carb

The generator stuff sounds pretty weird and off the wall.

Posted on Mar 14, 2009

ollie reece
  • 1167 Answers


replace plugs also on carb there will be a mixture screw the person probably adjusted this you need to turn this out and see if it improves 1/2 a turn if not screw it in 1 turn if still no difference fiddle with it also replace/clean air filter this may help good luck bud df7e911.jpg

Posted on Sep 09, 2009

  • 738 Answers

SOURCE: I purchased a kx 125 and it was a no runner. I

hi first off you must remove all the water as soon as possible as corrosion will occure very quickly on the big end and main bearings thus you will have to strip the engine to replace them so the quicker you remove the water the better, it may be when you removed the head the water that was inside the water jackets has gone inside the engine, however you do have a base gasket under the barrel that may have torn and leaked water into the engine, it would be best if you drain all the water out before you start removing the barrel, remove the piston by removing a circlip and tapping the gugeon pin out carefully remove the small end bearing, dry this and oil it, once all this is done useing compresed air blow out the water, if no air is availabe turn the engine upside down and alow water to run out, use some wd40 and engine oil to get around the bearings and remove the exsess oil when happy all is lubricated, when replacing piston ensure correct fitment arow facing exhaust port, if no arowlocate the piston rings in corect position and fit with the locating pins at the rear, any questions ,paul

Posted on Jan 19, 2011

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see the diagram attached.dee83cc5-459c-482a-acab-2db15817d412.jpg4ff12a78-85d7-4743-b610-010b820ca897.gif

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Hi i have a cr125 on a 96 it starts with a bump and when warm kicks up quite nice but now it wont start at all i have tried a new plug got a spark ,compression is fine, plenty of fuel ,drained the carb...

You may need a carb kit. Sputtering is usually one of two things. 1) bad seals in the carb, install a kit.

2) water in the fuel.
Clean the pitcock water trap, check the air cleaner, drain the carb

The generator stuff sounds pretty weird and off the wall.

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