Burned Air Filter?

[skids]

By 78 E had stock dual exhausts. At XS Camp 98, James Ho pointed out that the deposits on the spark plugs were in fact METAL! I had some crappy fuel economy, like 22 mpg. When I got home, I sawed off the mufflers and one of the baffles was gone (completely) and the other one was half gone (useless). I ordered a set of muffs from JCWhipme and they were glass-wrapped baffles. They did NOT provide enough resonance break-up to prevent the "echo" from interferring with exhausting gases from the cylinders. The same type of thing can happen from cracks or holes in the pipes under the foot pegs. If this pulse is not broken, the pulse is reflected to the open exhaust valve and exhaust can not be efficiently expelled. There is no carb tuning that can help this. Exhaust scavenging is the reverse and I believe that if the rpms are just right, the pulse can pull rather than push. I believe this is how dragster with uncapped headers works. I really don't know if this is your problem...maybe your main jets are too small??? Sorry for all of the rambling.

Originally posted by MAXIMAN
Skids

I never thought about the exhaust being plugged. What was up with your XS?

[MAXIMAN]

No need to be sorry. interesting reply.

I think I know now why Zilla was missing at higher rpms. it never has before...until recently (maybe last few weeks). That must of been when the filter burned. And when it burned... it burned a hole in two places on the filter allowing too much air flow...almost like pulling the filter out all together.

I maybe off base here....but I suspected Zilla was lean for sometime. Anyway cut to the chase...I replaced the filter today. When I got our on the road and open it up it didn't not have the slight miss from 6000 up to redline. It just ROLLED liked it used to.

I'm wondering if that air filter creates enough resistance in air flow to actually effect the AF ratio thus lean/rich of the mixture. All I know is since I replaced the filter it seems to be running right.