Air filter mods? - TwoWheelForum: Motorcycle and Sportbike forums
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post #1 of 3 (permalink) Old 05-09-2007, 11:47 AM Thread Starter
Join Date: Nov 2006
Posts: 138
Air filter mods?

Ok guys I've been a somewhat silent member, gathering information and ideas here for awhile and I have a question. I own a 95 ZX6R that has had a very hard life and I think the carb tuning is a bit off! I have just ordered a K&N stock replacement and a Stage 1 jet kit (dyno jet I think) birthday present. I have a Muzzy bolt on can on a stock pipe. Now I was thinking about going with the 4 cone filters to get more air but was warned against it from a friend who used to race enduros. I remember a mod we used to do to our turbo charged cars where we would just modify out air boxes by cutting the top off of them to let more air in while still keeping the flat air filter in place doing its job. Ok so now for the question. Has anyone ever done the same kind of mod to a bike or heard about it being done? Just curious if it has the same merit? I'm considering doing this mod if the filter and jet kit dont bring the mixture back down to my desired level. I know I'm running very rich at this point. Any ideas or suggestions are greatly apreciated! Thanks Guys!
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post #2 of 3 (permalink) Old 05-09-2007, 02:23 PM
Join Date: Aug 2004
Posts: 2,394
My 79 GS1000 has a small airbox with two quarter-size intake holes. On top is a hinged lid, about the size of a dollar bill, for taking out the filter. In the early 80's, Joe Minton, tech guru at Motorcyclist, tested mods on the GS. He took off the hinged lid, added a K&N filter, changed the main jet from a 95 to a 115, and got a noticeable increase in HP.

I took off my lid and got a K&N. I was pleased with the results. Later when I took off the carbs, I added a 105 main jet. The mileage decreased from 45 to 39 and the bike ran like crap. I changed the jets back to 95 and the bike ran great. Joe Minton did his testing at sea level. So it just depends on where you live. But modern airboxes are tested by the manufacturer for flow and sound. I wouldn't mess with them. But I bet your's would run a lot better after cleaning your carbs.
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post #3 of 3 (permalink) Old 05-10-2007, 12:17 AM Thread Starter
Join Date: Nov 2006
Posts: 138
Thanks very much for your input! It was just something that I was tossing around. I had the carbs cleaned at the end of last season. That helped very much! The gentleman that cleaned them said he thought that I had a large jet in them and that he thought it was way rich from what he could remember. He said he thought it was a 154. I just feel like Im a bit down on power and that I should be getting better fuel economy.

Thanks for your help!
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