Bridgestone Motorcycle Parts Discussion Board

Bridgestone Tech Talk => 50, 60, 90 & 100 Talk => Topic started by: Irishrower on April 27, 2011, 06:05:36 PM

Title: B-7 Air filter
Post by: Irishrower 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?

Title: Re: B-7 Air filter
Post by: ztnoo on April 27, 2011, 06:15:45 PM

Have you inquired of Richard?

Title: Re: B-7 Air filter
Post by: Irishrower on April 27, 2011, 06:36:19 PM

Yea I'm pretty sure I asked and he didn't.

Title: Re: B-7 Air filter
Post by: sidi 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.

Title: Re: B-7 Air filter
Post by: Irishrower on April 28, 2011, 07:31:35 PM

FYI I found a good replacement:

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

Title: Re: B-7 Air filter
Post by: Irishrower 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?

Title: Re: B-7 Air filter
Post by: reed on May 11, 2011, 11:01:55 PM

Irishrower
How does it run without the air filter!
Thanks.
Steve.

Title: Re: B-7 Air filter
Post by: Irishrower 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.

Title: Re: B-7 Air filter
Post by: reed 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.

Title: Re: B-7 Air filter
Post by: OldSwartout on May 13, 2011, 08:44:21 AM

Quote from: Irishrower 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?

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.