boost bottles

[dplb]

what are peoples opinions of boost bottles remedying (is that a word) stammers in two stroke power curves?? anyone done any experimenting

[filbert]

Yamaha used them for years called it YEIS it seems to work since when i disconnected it on my DT175 and plugged it because the hose perished it lost a lot of bottom end.

As i understand it when you shut off the throttle the intake mixture keeps flowing momentarily and backpressure causes it to fill the canister/bottle/YEIS and when you open it the extra mixture stored in it is available for more low end.

I guess it's similar to a spacer under the carb in an old school v8 giving it a little more torque off the line.

[EEKNOWS]

Biggest difference it wll make is to your wallet. The only real effect it has is to fuel economy(if you worry about such matters) where it makes a slight improvement.

[dplb]

Im asking cause Im running an athena topend in an rz with lomas pipes. I think ive got it running pretty good but Ive got a flat spot just as it comes on band. Ive thought about changing over to a banshee cdi or advancing the timing? started reading some of the stroker expansion pipes stuff and they talk about reed spacers helping with some issues(soundwaves pushing mixture through carb throat mutiple times, spacers reduce this). I cant find much on boost bottles,maybe they help stop excess scavaging? I saw a paper by yamaha on the yeis (or yies)system but had to pay for it, not willing ,does anyone know anything about this?? thanks in advance australia fair

[aaronmvrider]

i dont have one on my rz but i do have an internal crossover tube on my manifold ... guess thats pretty close to original... what reeds are you using...
i got some reed spacers you want to try them ??? 6mm thick... what carbs you running

[Evil Dwarf]

...