Hi i have jus brought a 02 honda cr250 and the power seems to break up when accelerating?

Question

to half to 3/4 throttle but when i give a it another blip it clears and pulls off also every plug i pull out is wet fouled i dnt think i am not ridin it hard enought and i also have a few dents in th expansion chamber but im told this does not make much of a difference also i am not sure how much oil to put in it it doesnt smoke much at all i am putting about 150 mil of oil to 5 litres should i lower this mix to 100-125 mil to 5 litres please could u help me it would be much appreciated

Answer 1

Sounds like it's running rich on the pilot and needle. You need to learn and understand the basics of jetting. Try raising the clip (dropping the needle) one groove for starters. Get the dents out of the expansion chamber or buy a new pipe. For trail riding try an oil-fuel ratio of 40:1. For motocross use a 36:1 to 32:1 ratio.

Answer 2

-Dents in your exahust won't make that much of a noticable difference.
-Mix your fuel @ 32:1 - Only use quality name brand 2 cycle motorcycle oil. Don't use any junk you get from an auto parts dealer. Don't use stuff for outboard boat engines, chain saws or weed wackers.
-Clean the air cleaner and don't over oil it.
-Repalce your reed valves with "Boyesen Reeds".
-Check that your power valves are working smoothly. Remove the cover on the side of the cylinder and operate the valves by hand.

Answer 3

To fix your pipe, remove it and plug both ends such that you can pump it up with your air compressor. Then gently heat up the dented area with a torch. The dent will pop right out! This won't fix your blubbering issue however.

Answer 4

Hi :) This has to be a carburettor problem. Adjust your carb. Check the setting up against what the repair manual says.
If this shows no improvements then check your ignition. And the lead from coil to the plug.

Answer 5

Try submitting your question to a Honda message board, such as this one: http://www.hondabikes.net/