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What about enlarging the two holes into one big one with the same trapezoidal shape and put some expanded aluminum screen behind?

The B&W has a CV carb, although efficient, practical and easy to operate, sucks hugely for tuning.  Unless I'm missing something, there appears no way to enrich the fuel/air mix i.e. no c-clip on the needle to adjust one way or the other the fuel/air.  So, this carb has got to go and a flat slide or equivalent will be on order shortly.  The CV carb is covered in hoses that go all over the place.  I'm sure there is a reason for the whole mess, mainly emissions, but the way I see it I'm riding a scooter and not driving a V8, so no big deal if a little C02 escapes my little .15L engine. 

JB

 

Thanks.  I haven't got pictures yet, maybe this coming weekend.  The scoot is kept at a garage away from where I live and access is a bit of a pain sometimes. 

I think I have, in theory, figured out how to route the intake properly using 2" ID tubing.  I've drawn crude pictures to help illustrate what I'm up to.  What I most like about what I'm proposing is that I can hack away and cut some holes etc, without destroying any of the factory intake hardware.  So if my attempt doesn't work I can change back to the stock set-up with no difficulty. 

A $2 pipe and a little plastic welding and the set-up will be done. 

Bear in mind this is all PRE-filter hose routing.  After the filter is as good as it will get for now or at least until the day comes when a flat slide carb arrives and I get more serious about tuning. 

Thanks for the information.  I'll get proper pictures in time. 

JB

Thanks for the information.  I've since pulled my airbox off and on the B&W it appears very restricted.  Inside the airbox there is only a small opening from the initial intake pipe and allows only a small amount of air to contact the air filter.  I drilled holes all along the inside tube in the airbox to allow more air to contact the air filter.  It's winter here, and although temps have risen sharply to be at a comfortable riding level, my scoot is uninsured so I haven't been able to test the affects of drilling the air box.  It does run smoothly and revs through the rpm range with no hesitation and no noticeable difference in sound. 

The biggest restriction, as you have pointed out, but as it applies to the B&W is the small initial intake tube diameter.  I don't know the actual specs but for comparison sake it visibly appears to have a 1" pipe going into a 1.5" - 1.75" air box hole.  This afternoon I'm going to dive into this issue and see if I can't make something work that will not restrict air flow. 

I'm wondering though, if I do manage to achieve the full breathing potential of the air box would there be a necessity to re-jet or otherwise tune the carb? 

JB

I know this is a very old thread, but I'm still curious.  Oldhummer stated that his B&W over heated when temps reached 80F?   I'm only curious because my B&W barely, if ever, even registers much of a temperature and I've ridden through wet-sinking-type sand at low speed for an extended period fully loaded with my wife onboard, when the temp was 97F and ONLY then did the fan kick on, it only kicked on for less than a minute at that.  What I'm wondering is who has the issue?  Is Oldhummer's scoot running too hot or mine too cold? 

JB

Hi,  I too have surpassed the 16,000km mark with my 2008 B&W150 and couldn't be happier.  Aside from the styling, this scooter has proven absolutely worthy.  The cooling system works extremely well and only once has the fan came on, but even then I was fully loaded with camping gear, a 1/8 scale RC car and accessories, box of wine, some tools, food for three days and my wife on the back, while riding through wet sand for about 5km in 30 degree C weather (86F).  Belt went at 12,000km,  I now carry a spare and seriously advocate others do the same.  It isn't as good on fuel as I initially hoped, but compared to driving my Jeep Grand Cherokee, it is a blessing.  Brakes are strong enough, although I do notice on really hard braking that the whole front of the scooter levers forward just slightly; brakes stronger than the frame? 

Also,  it should be noted that I am absolutely aggressive with my scooter all of the time.  I really try not to, and even feel guilty sometimes at the end of the day when I put it in the garage, but I ride wide open or full brake and very little in between.  I also ride a lot of intermediately aggressive off-road trails with lots of rocks, roots and water crossings.  This little 150 takes it in stride and has never once had any kind of minor or major malfunction, hiccup, miss, lag, lack of power or anything.  It always starts instantly, never smokes, stays clean and runs like new. 

My last bikes were a GSX-R1100 and street legal XR650R, both considered fairly wild mounts, but nothing really comes close to the fun and silliness that happens while riding a scooter.  Even if when in a un-official race across town situation, chances are the scooter wins, but the victory typically goes unrecognised because it is just so funny. 

I love this scooter and am presently outfitting it for a trans-Canada run this spring. 

JB