Question about Honda Motorcycles
MY HONDA F506 FOUR STROKE CULTAVATOR IS RUNNING FULL THROTTLE, STRIPPED CARB COULD NOT FIND ANY PROBLEM, MOVING THROTTLE LEVER MAKES NO DIFFERANCE. ANY HELP WOULD BE APPRECIATED JOHN
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Posted on Jan 02, 2017
If it is backfiring on deacceleration you have a fuel mixture problem and need to "sync" the carbs.
Sync Pro carb tuner works well. This is a precise four channel vacuum indicator designed specifically for intake synchronization of engines with multiple carburetors or throttle bodies.
Also, if you have not done so, check your plug wires for defects and resistors, if your wires have them.
Good luck, hope this helps.
Posted on Mar 16, 2009
Carbs gummed up. Need a serious cleaning or a full ruubers replacement/rebuild kit. Gas turns to gummy when left stting in the fuel bowls.
Use a couple of cans of Sea Foam.. best stuff in the world.
Posted on Mar 20, 2009
Try balancing ans syncronising the carbs.
BALANCE THE CARBS
Turn the throttle screw on the LEFT carb one half turn inward. Now start the engine and get it warmed up. With the engine running, remove the RIGHT spark plug wire. Adjust the idle speed on the left carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.
Now turn the throttle screw on the RIGHT carb one half turn inward. Restart and rev the engine. Next, remove the LEFT spark plug wire. Adjust the idle speed on the right carb to the point where the engine just can't quite stay running and dies. Now put the loose spark plug wire back into place.
Turn the idle screw on each carb EXACTLY ONE QUARTER turn outward and restart the engine. The engine will be probably be idling very fast. Adjust both the idle screws equally from this point to get to the desired idle speed.
SYNCHRONIZE THE CARBS
Remove the air filter and rubber fittings to allow you to see into the throat of both carbs. You may need a mirror to see inside. You need to be able to see the slides go up and down when you twist the throttle. Now turn the fitting where the cable goes into each carb such that there is just a bit of slack in the cable, 1/16" is plenty. Lock ONE of the cable adjusters down tight. All further adjustments will be made on the other carb.
With the motor turned off twist the throttle very slowly while looking at the slides. Both slides need to begin lifting at the exact same moment. If the slides don't raise at the exact same time then slowly twist the throttle until the locked adjuster slide just barely starts to move. Hold the throttle still and turn the adjuster on the other carb so that the slide on that carb just barely starts to move also. Now recheck the slide movement timing. Do this process until the slides on both carbs begin to raise at the EXACT same moment. Lock down the loose adjuster and re-check the slides.
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Posted on Mar 30, 2009
it sounds to me like the throttle slide has been installed incorrectly,unscrew the throttle housing off the top of the carb(it looks like a cap and the throttle cable goes through it)remove the throttle slide from the housing,down one side of the throttle slide there is a piece cut out that goes the whole length of the slide (lookes like a groove),inside the carb body there is a small brass knob,this groove or cutout goes over the knob and it stops the throotle slide from rotating,once you have installed the slide back in the carb the slide should drop right to the bottom of the housing,you can check this by looking through the rear of the carb and you should be able to see the bottom of the throttle slide,if the slide is installed incorectly the little brass knob stops the throttle slide dropping to the bottom of the housing and will give full throttle,its an easy fix and wont take more than 10mins to repair,hope this helps
Posted on Jul 10, 2009
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