Question about Honda CRF 150 F Motorcycles
Arizona requires emissions testing on Dirt Bikes and ATVs. This bike starts easily and idles smoothly. However.....it failed the emissions test on Carbon Monoxide. It passed on Hydrocarbons. The bike has failed twice. After the first test, I realized that the choke had been half-way on during the test. Before the second test, I ran out the old gas and filled it with high octane. I also cleaned the air filter. I warmed the bike up for an hour before the test and made sure the choke was off. The second test was worse than the first. The hydrocarbon score was worse (but still passed) and the carbon monoxide was also worse than the first test. How should I adjust the carb and what screws should I turn?
Hi this is not a permenant fix but before you take it for a emission test you wana make sure the engine is red hot ,clean oil,clean fuel these are the only things that could cause problems with a carbon test im not over familiar wiv the 150 but i assume there is no computer as these can sometimes make sensors tell lies if so then i would suggest looking at this aswell.
Hope i have been of some help
Posted on Mar 12, 2013
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Posted on Jan 02, 2017
i'd say the carb is gummed up especially the pilot jet (#16158) in this pic of the USA carb. may have to remove the carb & bowl and then remove the pilot jet (w/ flat head screw driver) and clean out the tiny holes.
the carb slide is installed backwards (turned 180 degrees). its #16025 in the pic. i've done this before on my daughter's XR70 and Z50. you'll know if its this when you move the choke lever, RPMs increase and decrease.
hope this worked for you and was fast enough.
Posted on Feb 06, 2009
Remove the water trap bowl at the bottom of the petcock, (gas valve). Any water or trash in the bowl? Drain a cup of gas from the tank. Any water or trash in the cup? Dump it, clean it and re-mount it, ( not all bikes have a water trap bowl ).
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. Install a new stock NGK spark plug and try to 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 all the little airways and fittings in the carb. Remove the two screws on the outside throat of the carb and spray into the screw holes as well.
< < READ CLOSELY > >
Be sure to put these two screws back in the same hole they came out of. IMPORTANT > do not tighten these two screws down. Only screw these in until they LIGHTLY seat. Now turn each screw one and one half turns outward. Put the rest of the carb back together, clean the air filter and install the carb. Let the float bowl fill then start the engine. This process should get you back on the road.
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Posted on Mar 29, 2009
SOURCE: 1994 GSXR 750 wont start
the carbs are proberbly blocked, you might have rust in your tank that will keep blocking, put an inline fuel filter in and get carbs cleaner, you also got a flat battery, give i little revs until it starts then adjust the idle
Posted on Jul 11, 2009
SOURCE: cant keep idle at one rpm
First, check that you gas cable is not kink or something when you replace the tank. Also do you know the procedure to ajust the carb. Let the motor heat up and ajust the two screw. Does the choke keeps on, or have something broken. Something big is just on front of you. PAtience, you'll figure that out... It doesnt sound like something that needs to be clean here...
Posted on Aug 05, 2009
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