Spin off topic from my BBK dyno testing thread.
So, one thing we can absolutely conclude, is that in order to run that BBK, you MUST address those intake issues. Perhaps Taz could possibly see into adding a supply of Kitaco intakes to his eBay store line up. Perhaps Brandon could get a low cost Mikuni kit to offer. Perhaps an adapter combo fitted for the Spree carb. But an intake solution is an AT MINIMUM must, when using a BBK.
That's the minimum I would go.
Currently as I'm looking, I'm showing it's gonna run somebody roughly $170 AT MINIMUM.
Don't know or care how frugal you are, it is what it is, and if you think about it... it's really quite cheap.
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TAZLAND001 (chopchop*123) 48mm BBK
KITACO INTAKE
CP adapter
Pod filter
So OK, you got the reasonably priced Kitaco, what can you do for free or at cost to it to improve performance. This free, or possibly paid for service would consist of...
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Ported reeds
Ported intake
SB50 reeds (preferably ported)
BBQ UR' MUFFLER.. DRILL IF NEEDED TO REMOVE WASHER RESTRICTION.
Delete oil pump and switch to 32:1 premix (recommended)
If you keep the pump, run 96:1 in the tank, 80:1 for break in.
So then your next option for gears anyway, should only be the aftermarket 15:81 gears.
This will slow down your take off experience, but the power in the BBK makes up for it. You'll get better gas mileage out of that same 35mph, the BBK will not be under as much RPM stress to get you there, and you'll even have a little oomph to spare to push you up past 40.
I guess I have 1 other recommendation and that has to do with break in. Keep it within it's powerband range during break in, do not exceed this range while breaking in.
8,000rpm MAX while breaking in. Don't care if it will now do 9, 10,11, or even 12k. Keep it in it's power band.
To give you a rough guess estimate of what that would more then likely be, I'll base it off available gears
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12T: NO MORE THAN 20mph during break in
13T: NO MORE THAN 25mph during break in
15T: NO MORE THAN 30mph during break in
From there you start spending money on things like carb upgrades to like maybe a Mikuni or Polini. As well as the next big investment and going with the MLM pipe. Or, get one fabbed. Whatever's in your budget I guess.
So you could take the "upgrade" path many different ways, alot of it, you can do if you can turn a wrench.
Again, this is just my opinion of a low cost to high cost analysis. I won't go any farther in calling anything extra listed or optional as a "MUST HAVE" Other then the BBK, Kitaco and adapter.
japan.webike.net , Scooter Swap Shop, eBay.. This is where you will find those 3 MUST HAVE parts. Amazon also sells the Kitaco. All 3 places offer the upgrade parts and options.
All tallied, you may end up spending close to $600+ dollars if you go all out !!!
All parts with links to some of their respective vendors, can be found here:
viewtopic.php?f=1&t=33591&p=295922#p295922
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