First Generation Ascots > The Thumper Years: Stock To Lightly Modified

newb with a new engine noise

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zaqattack:
Hey guys new to the forum and figured I'd introduce myself. I ride a 1982 Honda Ascot and it's great! I hit 10000 miles a few weeks back and right when it happened my bike developed a ping (light metal noise going with the rpms) and I'm new to street bikes and just can't seem to figure out what it is. It doesn't worsen under more weight and it does lighten when I back off the throttle and it's only when the engine is warmed up. Any ideas?

J6G1Z:
Take a long screwdriver, ratchet extension, or length of tubing & hold one end to your ear, while the other end is used as a Doctors stethoscope to probe different locations of the engine while listening for the sound to get louder. This will at least let you figure out where the noise is coming from.

Check your exhaust head pipes for any signs of rust, especially on the underside. Then use your "stethoscope" to see if the pipes are rattling. The head pipes are dual wall tubing & often times the inner tube will seperate from the outer tube & cause a rattling sound. Let's hope that this is your problem vs. something inside the engine. If it is indeed the exhaust making the noise, it is fairly easy to fix. You need to remove the pipes & drill a few holes along the very bottom (where the holes cannot be seen) of the outer pipes. Do not drill through the inner pipe. Now have a welder weld the inner pipe to the outer pipe at each hole that you drilled. Squirt a bit of paint on the welds & then re-install your exhaust system.

There is also an after-market performance header available if you'd rather go that route.

So... Find a listening device, start your bike & search for the source of the noise. Then let us know what you find out.

Good luck
J.

thumperdh:
Total shot in the dark here but check the nuts that holds the header to the exhaust studs. Mine like to back themselves off and that usually creates a weird ping sound.

scottly:
A length of rubber or vinyl tubing can be used as a stethoscope to locate exhaust leaks: hold one end near your ear, and probe around with the other end. 1/4"-3/8" ID tubing should work. 

zaqattack:
After a little further investigation it sounds like it is coming from the exhaust baffle. It's really only when the exhaust is under pressure and when I used the rod to probe around everything in the engine sounded fine but when I moved to the exhaust it got louder.

J- you mentioned something about an aftermarket header? I might be interested, where can I find some information on that?

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