Help me diagnose backfire or miss? 1984 GW Aspencade


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Help me diagnose backfire or miss? 1984 GW Aspencade

Postby gof » Sun Jul 29, 2012 1:35 pm



Background:

Bikes been stored for 4 seasons - dropped oil, diverted stator wires, new battery back up and running.

Bike has maybe 20 miles since getting it running again, still sorting out the back brakes.

It runs better than before, since rewiring past the stator plug. Between 1500 and 2750 I get a random "cough". Sometimes once, sometimes 3 or 4 quickly.
They seem to effect power. It also seems like I can feel something in the pipes below me, a minor pop.
I do know if I leave the fuel petcock on while parked, it will leak gas. So my amateur mechanic mind thinks maybe a stuck float? Could this let gas into the exhaust unburnt or is this more like a misfire?


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Re: Help me diagnose backfire or miss? 1984 GW Aspencade

Postby virgilmobile » Sun Jul 29, 2012 2:06 pm

When it does that,add a little "choke".This enriches the fuel.If it clears up,the engine is starving for fuel,if it gets worse,it's running rich.
I suspect a sticking slide.You can run some Sea Foam through the system first to see if it will help.If it doesn't improve,the carbs will have to come off and be polished up.
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Re: Help me diagnose backfire or miss? 1984 GW Aspencade

Postby gof » Sun Jul 29, 2012 2:12 pm

virgilmobile wrote:When it does that,add a little "choke".This enriches the fuel.If it clears up,the engine is starving for fuel,if it gets worse,it's running rich.
I suspect a sticking slide.You can run some Sea Foam through the system first to see if it will help.If it doesn't improve,the carbs will have to come off and be polished up.


Ok the fuel in there does indeed have sea foam in it. Once I get the back brake fixed I will run it through two tanks of gas with sea foam in them.
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Re: Help me diagnose backfire or miss? 1984 GW Aspencade

Postby virgilmobile » Sun Jul 29, 2012 2:21 pm

My 84 had a lean condition between 1500-2500 rpm consistently before and after cleaning and syncing.
I found out that it was a common problem.I cured mine by lifting the slide needles with a small washer.

I only recommend this if it is consistent and a little "choke" clears it up.
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Re: Help me diagnose backfire or miss? 1984 GW Aspencade

Postby bustedwing » Sun Jul 29, 2012 8:56 pm

Keep an eye on your oil level and if it seems like you are making oil that is extra fuel in the crankcase, which will dilute the oil and of course do your engine innereds no good. That extra fuel normally comes from the carb, and since you are having carb problems, that is why I am mentioning it.In that case the carbs would have to be rebuilt.


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