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DT125R Forum -> Tuning -> "Boost" bottle or restriction bottle?
Post Info TOPIC: "Boost" bottle or restriction bottle?
Kalamity Kid


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"Boost" bottle or restriction bottle?
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The little black bottle in the airbox-to-carb rubber is often referred to as "boost bottle" but a lot of people seem to suggest blocking it off as part of de-restriction measures.  Calling it a BOOST bottle seems to suggest to me it improves performance rather than restricting performance.

My bike had this in place of it (see previous thread)

http://dt125r.activeboard.com/t44727700/unusual-induction-mod/

I guess I'm looking for a definitive anwer really.  Is performance better with or without.  I'm looking to get a rubber from an earlier DT without the hole in it and put that on my bike.  And also what does YEIS or whatever is mean when they the manual talks about the other little bottle on the inlet rubber into the reed block?

Sorry if this has been covered before and I'm flogging a dead horse, it's just that there's a lot different opinions about these two induction chamber things and it's hard to know who's right and who's wrong! 



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xGINCATx


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YEIS (Yamaha Energy Induction System)
The one from the airbox-carb rubber I blocked up and pulled off the airbox snorkel and it ran much better, this was when I got my RE and everything on it was stock..
The one that goes into the reeds I left as it was as that's where the backflow of vapour goes

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