Boost bottles and a/f mix?

Kpi890

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So these boost bottles... how do they affect the air fuel mixture once installed... do they lean it out or richen it? Also, does a boost bottle work on a similar premise as a reed valve... in the sense that it is trying to manage some backflip from the carburetor? I know a reed valve only lets air/fuel mix into the engine and prevents any blowback into the but does the boost bottle just take that blowback up into it and then reuse it on the next stroke or something? I am looking to make my own boost bottle considering they are very simple designs and was also wondering what the dimensions need to be for it... I’ve seen people make them out of many things so just looking for some advice as to size... and what size tubing and brass fittings are used? Thanks!
 

crassius

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never seen a boost bottle work on a non-reed valve motor - waste of time/money for standard bike
 

Kpi890

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Yea I’m sorry after reading through a few threads I’ve realized that it’s not worth my time... however would adding a reed valve alone to my setup be beneficial?
 

KCvale

In memory of KCvale 1959 - 2019
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I always have to snicker at gasbikes BS products, and the boost bottle was a Gem.
It won't be long before they have a rolls of:
"Speed Tape" for 5.99 ;-}
 

crassius

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not sure why you think adding things is a good idea as many things can stop the motor or slow it down - only thing guaranteed to work is get a bigger and better motor
 

6blueoval9

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Yea I’m sorry after reading through a few threads I’ve realized that it’s not worth my time... however would adding a reed valve alone to my setup be beneficial?
Adding a Reed valve will require a windowed piston to function properly.

Boost bottles are designed to store pressure and fuel...on a stock motor or any non Reed motor the air and fuel is pushed in through the intake and also forced back into the intake which makes for an unstable air fuel mixture ratio...The boost bottle returns this fuel shot back through the intake and forces it back into the intake then to the motor.

A Reed valve opens and closes with each cycle not allowing the air fuel mixture back into the intake which provides a more stable air fuel mixture that improves all around power.

All Reed valves will improve bottom end and midrange but the bigger you go ( 2 ,4 ,6 petal reeds) the more top end that can be gained as well.

Reeds require some porting or at least matching to gain full benefits from them and a larger carburetor is almost a must or at least a decent amount richer on the jetting.

If you want to keep your carburetor I would recommend one of the smaller Reed kits like the RSE kit which is a 2 petal Reed that will improve mostly your bottom end and midrange power with maybe a tad bit lost on the top end.

I would still concentrate on learning on a stock motor first then modify in steps as you learn how a certain mod helps you or can even hurt you...Its too easy to bolt on a bunch of "racing" parts and end up with a weak azz motor.
 
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