shifter kit/jack shaft/boost bottle

adrian101

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Apr 10, 2011
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Location
Sydney, Australia
I have some questions regarding shifter kits.

Do they increase the life of the engine?
Do they increase the speed of the bike as it runs off the bicycle gears?

Is 300aud to much to pay for one?

do the boost bottles really work on motorized bikes or not?
 
Boost bottle and expansion Chamber YES! Look up how a two stroke works and you will know right off the bat

Shift kit... idk dont have one
 
a shift kit will not prolong the life of the engine.
It will increase the top speed opf the bole tho since you can have more than one gear to go through (like a transmission).
the bonus is that it gives you the best of both worlds...low gearing for good take off, and high gearing for top speed. It will allow you to cruise at 25-30 mph in a higher gear, which will make the engine run at lower rpms. That would be less strain on the engine, and higher mpg.
I personally would not buy a shift kit simply because of the cost. I can build 2 single speed motorized bikes for the cost of one shift kit.

boostbottles...some people say they work and some say they don't. a boost bottle can work as long as the engine is set up to make it work (this requires internal modifications to the ports). i have read about people just bolting a boost bottle on and then saying that they notice a difference in idle, the engine is easier to start, and it gave a little more performance. I bolted one on and the only difference i saw was that my wallet was $20.00 lighter. so, boost bottles are debateable.

an expansion chamber will definitly give you more power as will a better high flowing air filter.
also consider going to an ngk spark plug, and an automotive style spark plug wire with a rubber boot on the end.
 
My motor was always running pretty good but I could never reach full throttle because the engine would start to cycle. I instaled a boost bottle on this engine and now i can ride it wide open with no cycling of the engine. Its awesome. I than instaled a velocity stack from JNMOTORS and now it just flies, It takes a bit for everything to perform but I get my revs up it just takes off. Im running a 38 tooth sprocket and my buddy uses a 44 and I can out power him on any hill and leave him behind. Well worth the bucks
 
I have some questions regarding shifter kits.

Do they increase the life of the engine?
Do they increase the speed of the bike as it runs off the bicycle gears?

Is 300aud to much to pay for one?

do the boost bottles really work on motorized bikes or not?

1) It can if you select the proper gear ratio. The thing is, you will end up riding he bike much more because it will be so fun.
2) It will definitely increase your acceleration from a standing start.
3) I think even with shipping the $199 HD SBP kit will be under $300. ~250.
4) Boost bottles don't work for me. Nothing beats an expansion chamber for bolt on engine power.
 
Thank you all for the help in answering my questions. Does anyone know if SBP has the black expansion chamber in stock. It says it doesn't on their website :(
 
Thank you all for the help in answering my questions. Does anyone know if SBP has the black expansion chamber in stock. It says it doesn't on their website :(

A couple people said this in the last several days. I can assure you we are fully stocked. I'm guessing - Maybe you need to just fresh your browser, because it hasn't said sold out since this time last week. Thanks!
 
Do you ship to Australia? would you have an guesstimate time of devilry? lol

do you think it will fit nicely on a bicycle like this below:

[img]
 
Do you ship to Australia? would you have an guesstimate time of devilry? lol

do you think it will fit nicely on a bicycle like this below:

http://img814.imageshack.us/i/beachcruiser.jpg/[img][/QUOTE]

Yes. Please read on our site about international delivery. It can be 5 days, and it can be 30+ days, depending on the mood of your customs.

Hard to say without an engine :giggle: our pipe will fit almost any set-up. But you have to think and put some work into it. Maybe make a bracket of your own for your situation. All REALLY EASY for the most basic mechanical type.

But we don't do no [I]devilry[/I]!
 
hi
let me answer all ur q but boost

yes sbp ship here too syd ..takes less than 2 weeks
yes a expansion is the best exhaust other than a power pipe
yes i have a 48cc rse motor its a hp2.5
bike has 7 gears (14-28) but u want a 8spd 11-32
im in villawood


brad
 
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