spurdy Posted February 16, 2009 Report Share Posted February 16, 2009 too much gas and not enough air so the boost bottle makes up for that lack of air. The volume in the boost bottle would be air/fuel mixture anyway! Sounds like there wasn't much thought put into what your teach told you. SP Quote Link to comment Share on other sites More sharing options...
AKheathen Posted February 16, 2009 Report Share Posted February 16, 2009 ok....here we go again. i'll try to keep it short how it works: the resonator (original name for boost bottle) absorbs the return pulses that sneek across the reeds. the pulse causes a double-enrichment effect. absorbing the pulse makes the air pass one way at low throttle positions. what it's for: the point of eliminating the double enrichment is for better metering at partial throttle. for this reason, you do actually have to richen the pilot vs. the x-over pipe. on larger 2 stroke engines, such as snowmobile engines, there is much more noticeable effect on both top and bottom because the resonator works as a crossover passage where there was not one before. what it actually does: on the banshee- mutes the snap, giving a more gradual power increase. the only 2 uses i found for that effect are, better controll on verry technical trails, where throttle controll becomes difficult, and giving my daughter a ride around the yard, up and down hills. other than that, it just takes the fun out of playing around. on a snow machine- if you want to keep from burning up belts trail ridding, it's a quick bolt-on solution with a slight added boost effect in the midrange, coining the nick-name "boost bottle" facts: Yamaha developed the resonator Yamaha uses the crossover tube on the banshee because it performs way better. the resonator was designed for 4stroke, and not as a shared chamber. hope this helps for now. i will have dyno tests this summer running bottle, tube, and plugs on different reeds, timing, and filter setups on a low-mid bike Quote Link to comment Share on other sites More sharing options...
TwistedSheeRida Posted February 16, 2009 Report Share Posted February 16, 2009 nice info im going to take mine off and see how it goes after Quote Link to comment Share on other sites More sharing options...
Rodneya Posted February 17, 2009 Report Share Posted February 17, 2009 Whats going on. No reply from Michael Jackson on his favorite mod. :biggrin: Quote Link to comment Share on other sites More sharing options...
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