Noise out of the muffler

[sarnali2]

I've noticed that myself, hold a dollar bill across the muffler, if it blows out everything is fine, if it sucks in you've got a defective exhaust valve.

Remove the exhaust system, remove the carburetter,intake boots and airbox, remove the cylinder head, remove engine/transmission, remove the gas tank, remove the front fork and wheel, remove the entire wiring harness being careful not to damage any connectors, remove rear wheel, fender and shocks, discard frame and license plate in large body of salt water, soak until unrecognizable. Use dollar bill to call Insurance agent and police station, fill out stolen motorcycle report. Use Insurance windafall to purchase a motorcycle that you don't have to mess with. Sell removed parts on ebay......

[MOKE1K]

Check the seating at the motor at the header. I used to have a old Bonni that had a crack at the top of the pipe. It would puff very little smoke out of that hole, but you could hear it when standing behind the bike.

Wouldn't the bike just end up backfiring on acceleration. One way to
diagnose an airleak.

[BikeRider12345]

Originally Posted by acecycleins

Is this KP messing with you guys.

What is a motor- an air compressor with a purpose. Air, fuel, ignition- throttle and so it goes.

Check the seating at the motor at the header. I used to have a old Bonni that had a crack at the top of the pipe. It would puff very little smoke out of that hole, but you could hear it when standing behind the bike.

I'm not messing with anyone. So now that I got it on the road I notice that it starts back firing when I ride. So I guess the air noise was a backfire without the pop. Thanks for the help.

[seruzawa]

Originally Posted by BikeRider12345

I'm not messing with anyone. So now that I got it on the road I notice that it starts back firing when I ride. So I guess the air noise was a backfire without the pop. Thanks for the help.

KP is a reference to a troll who shows up here frequently and posts strange questions,etc. He often uses "rider" in his name. However the troll lives in Seattle.

[pushrod]

BR12345,

I'm thinking it is a synch problem. You have one (or more) cylinder that is loading up, and a rich mixture is causing a tailpipe backfire.

The 'pop' when the bike is idling is a small version of the same backfire.

Outboard motors are very bad about this. Being two-strokes, sometimes the backfire is so stout it'll stall the motor.

[The_AirHawk]

Originally Posted by sarnali2

I've noticed that myself, hold a dollar bill across the muffler, if it blows out everything is fine, if it sucks in you've got a defective exhaust valve.

All I've got is a Susan B.

Will that work?

[BikeRider12345]

Originally Posted by pushrod

BR12345,

I'm thinking it is a synch problem. You have one (or more) cylinder that is loading up, and a rich mixture is causing a tailpipe backfire.

The 'pop' when the bike is idling is a small version of the same backfire.

Outboard motors are very bad about this. Being two-strokes, sometimes the backfire is so stout it'll stall the motor.

Well when I pulled off the cover to the air box, it has JB Weld all over it, leading me to assume it's not in the best shape. I am going to put the pods on the back, which means I will have to rejet it. Someone told me to use a dyna jet kit, is that what I should do?

[seruzawa]

It seems that we frequently get questions from people who bought a used bike from some owner who modified the airbox and/or exhaust. These mods usually make a bike run worse. If you can't rustle up the stock components you might try the pods and a Dynajet or Holeshot jet kit. Often the pods just don't work. But you can try making tubes to go between the pods and the carbs out of pvc. Sometimes inserting a tube a couple of inches long will smooth out the airflow and improve things. I had to do this on a DR400 I got cheap ($40) and was missing the airbox. It can make all the difference in the world if you are forced to use pods.