batman
Serious Thumper
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SuzukiSavage.com Rocks!
Posts: 3806
osceola new york
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Chris , doesn't it seem funny that racing motorcycles ,don't run air filters at all? The problem you have isn't that the slide isn't opening it's the fact that the fuel mix is going lean. what you could try rather than restricting the air intake is removing one more washer from the needle jet. your running a bigger piston the vacuum in the carb is caused by the piston moving down ,drawing fuel and air in and has little to do with the size of the air cleaner. but let's look at where the power is being made, what's happening in side the cylinder? how do you make power? air and fuel in ,BANG exhaust out! getting the exhaust out is all important! exhaust has two components ,a pressure wave and exhaust gases, the wave travels at nearly the speed of sound the gases slower. when the wave reaches the end of the header pipe some of it leaves with the gases but the rest reverses and moves back up the header as a negative pressure and if it arrives during valve overlap(rpm dependent) helps pull out the remaining exhaust gases and helps pull in more fresh fuel mix. your wave is weakened buy having a drilled muffler more of the wave is leaving with the gases, and you've restricted the incoming fuel mix . therefore you leave more exhaust gases in the cylinder and there is less room for the incoming mix (Leaner charge=less power)It seems funny to me that my stock 95 will run 88mph with only a Dyna muffler and carb jetting. your attacking the wrong end of the problem.
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