Author Topic: B-7 Air filter  (Read 3979 times)

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Offline Irishrower

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B-7 Air filter
« on: April 27, 2011, 06:05:36 PM »
Does anyone know where I can find an air filter for my 7?  Anyone have a good source for a generic scooter filter and housing until I can find the real thing?

ztnoo

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Re: B-7 Air filter
« Reply #1 on: April 27, 2011, 06:15:45 PM »
Have you inquired of Richard?

Offline Irishrower

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Re: B-7 Air filter
« Reply #2 on: April 27, 2011, 06:36:19 PM »
Yea I'm pretty sure I asked and he didn't.

Offline Sidi

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Re: B-7 Air filter
« Reply #3 on: April 27, 2011, 10:26:52 PM »
I once used a Craftsman lawnmower air filter. The replaceable filter was housed inside a black plastic, clamp-on round cage, that fit nicely into the frame cavity.
BS-7D,  BS 175DT

Offline Irishrower

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Re: B-7 Air filter
« Reply #4 on: April 28, 2011, 07:31:35 PM »
FYI I found a good replacement:

http://store.knfilters.com/search/product.aspx?Prod=RC-2540

The flange size is just over 1" and looks like it will be small enough to fit. Autozone had to special order it.

Offline Irishrower

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Re: B-7 Air filter
« Reply #5 on: May 11, 2011, 10:47:04 PM »
Ok here's the latest:

I installed the K&N and it barely runs.  Lots of smoke, no power.  I tried turning the adjusting screw on the carb but it doesn't help.  Any ideas?

Offline reed

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Re: B-7 Air filter
« Reply #6 on: May 11, 2011, 11:01:55 PM »
Irishrower
How does it run without the air filter!
Thanks.
Steve.

Offline Irishrower

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Re: B-7 Air filter
« Reply #7 on: May 12, 2011, 08:24:56 PM »
Very well.  Idles fine, good acceleration and torque, no smoke.  Ive gotten it up to about 35 on a flat road.  When I put the filter on I can barely get it to idle without giving it gas, and even then it sputters.

Offline reed

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Re: B-7 Air filter
« Reply #8 on: May 12, 2011, 09:42:16 PM »
Irishrower
Have you been into the carb, i would like to know the jet sizes.
And the float height setting etc.
Thanks.
Steve.

Offline OldSwartout

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Re: B-7 Air filter
« Reply #9 on: May 13, 2011, 08:44:21 AM »
Ok here's the latest:

I installed the K&N and it barely runs.  Lots of smoke, no power.  I tried turning the adjusting screw on the carb but it doesn't help.  Any ideas?
Some possiblities:
Float level too high.  Just a bit of extra restriction with a freshly oiled K&N may be causing it to pull too much fuel.

Way too much oil on the filter.  Rinse it out with gas, then mix some oil with gas, about 60% gas/40% oil, wet the filter with it, then let it dry for a few hours to get rid of the gas.

I've also heard of K&Ns causing a problem on some bikes - the blowback of air/fuel through the carburetor catches in the filter, then gets sucked back into carb on next stroke, but that's usually on race bikes with pretty wild intake timing.
Karl Swartout
Mooresville, IN
BS175 Roadracer
BS350 GTR

 


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