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If you fit a pod filter, or take the lid off the air box, you are allowing more air into the engine. Therefore, you must also allow more fuel to mix with the air. To do this, you must increase the jet size in the carburator. I recommend Dyno Jet brand jet kits. They will have all the parts necessary as well as tuning guidelines to follow.
These engines are designed and tuned specifically to run the best with the stock air filters as well as the stock mufflers and exhaust. Putting pods on and chopping off your exhaust pipes may look cool but it will cause the bike to run very poorly My advice would be to put it all back to stock and see how she rides and then change things one at a time.
If the "pods" are meant to be direct factory replacements, then no jetting is needed. Filters like K&N will come with instructions if any jetting is needed for their installation. You'll need to check with the manufacturer of the "pods" - since you didn't provide the make/model of them here, I can't say for sure if they require a jet adjustment, replacement, or if you don't have to do anything.
Going to the manufactures specs or anybody's specs for that matter won't help you, you have interrupted the air flow, Get an adj jet from Dyna flow, I did the same thing, went back to the oem specs and still wouldn't run. Got a Dyna flow kit and off it went. Those things are expensive but worth it. Plus they are adj. And you get a free dyno check if you ever find somebody with a dyno tester. My Mikunis were a little newer, but I'm sure they got something. I found mine on Ebay. Hope this helps.
i put 115 main jets in my 77 ge 750 and it will run but was told to jump up to 140 with pobs and 4into1 pipe (SM6) race pipe at the low side run 130 main and leave the stock pilot in. i rorde mine from NE to SD roude trip about 1300 miles got about 62 MPG with 115 jets jumping up to the 140 will drop the MPG but lets be real im not looking for MPG. hope this will help.
you dont need more gas through the valve. unless all out racing, that shouldn't be a problem. you definately need rejetting. the proper jet size can only be determined by trial and era. you need a dyno to tune properly. but of the head I would say start with 10 sizes over what you had. say if they were #120's, go with #130's. this should get you in the right direction.
Check the K&NFilters Website and you'll probably find the right size for your bike. Be aware, though, that changing air filters can lead to less performance as a result of carburetor jetting problems that can take some time to solve, and get your bike running well gain. Usually the manufacturer's set-up works better than home-fiddled-with ones.
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