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1500 popping / backfiring

789 Views 5 Replies 6 Participants Last post by  exavid, 
mwhit1500
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Hi Guys,
I have a friend that has a 93 GL1500 trike that I ride with. He is having an issue with popping/ backfiring from the exhaust upon deceleration. I saw posts on the air cutoff valve on the older wings. Is there an air cutoff valve on a 1500? If not any suggestions on what to look for to solve the popping? New plugs, timing belts and filters installed in the last 5,000 miles. Other then the popping it runs fine. Any suggestions would be greatly appreciated. Thanks Mike ;)
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DaveO430
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Mike, the 1500s have a different system than the air cutoff valves on the older models but accomplishes the same thing. The most common problem with the 1500s seems to be cracked vacuum hoses.
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jrr199
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Ditto on the vacuum leaks. My 89 had the same problem and I cured it by correcting a couple of vacuum leaks. My leaks were in the hose behind the spark plugs. It is under the rubber mat. You have to remove the lower fairing to get to them (one on each side). The hose has a 90 degree bend where it attaches to the intake and there was a hole on the backside of the bend. Cut it off and reinstall. The bike runs much better.
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Sonny in Indiana
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My 94' had those symptoms, and it was the diaphragms in the carburetors. They were not real difficult to change, but you do have to pull the carbs to get them out. If you do it, make sure you replace the vacuum hoses at the same time since you are into it that deep.
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agnogel
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when you say you changed the filters did you do the sub air jet filter they have a habit of disingrating and getting sucked into the carbs and air jets
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exavid
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Honda calls it a Shot Air Valve on the 1500, it works a bit differently than previous models. Instead of adding fuel to the exhaust to prevent popping the shot air valve bypasses the carb allowing air into the manifold reducing the high vacuum caused by the closed throttle plates. This prevents overly high compression braking and backfiring by making the mixture too lean to pop.
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