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Re: Engine backfires, quite a lot, at lower throttle and...
You need to either clean your carbs or you have a valve out of adjustment mine was doing same thing because of dirts carbs hope that sheds a little light on subject
somthing else I was going to tell you wa s I change to the next # down on the spark plug which is a hotter burning plug also helps if it has been loading up on rawl fuel
somthing else I was going to tell you wa s I change to the next # down on the spark plug which is a hotter burning plug also helps if it has been loading up on rawl fuel
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take it to a shop. you have a dirty sensor or something that you might not be able to fix without computerized diagnostic equipment..... might I suggest a triumph made before all of the computerized gizmo's? they are less expensive to maintain.
Sounds like the carb is frozen or the ignition timing is way out (check distributor and loosen the clamp, turn it slightly with the engine running until it idles and revs up nice) . Reset the ignition timing, if that does not cure it, a carb rebuild is on the cards.
backfire will be normal if shuting engine off at full throttle. Idle engine down as low as it will go before shuting off and that should stop the backfire. Look under motor at pulley area and make sure there are no oil leaks, if not you have an internal engine problem rings or valve seals.
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 theLEFT 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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