Tech Corner

Technical Q and A for classic motorcycle maintenance and repair.

1970 BSA Victor Special Leaking Fuel

2/7/2013 11:40:41 AM

Tags: BSA Victor Special, leaking fuel, Keith Fellenstein, Tech Corner

 Keith Fellenstein 

Editor’s note: If you’re having trouble with that old Suzuki, BSA or BMW, Keith Fellenstein is your guy. From motorcycle tuning tips to detailed motorcycle engine repair, he can draw from a wealth of experience to help guide you to success. Send questions to: Keith’s Garage, 1503 SW 42nd St., Topeka, KS 66609, or send an e-mail with “Keith’s Garage” as your subject. 

1970 BSA Victor Special Leaking Fuel 

Q: I have a 1970 BSA Victor Special and have a question about a leaking carburetor. Other than the fact that the petcock leaks fuel into the carb, why does the carb leak fuel into the air cleaner? I have owned the bike from brand new and only have just turned 2,500 miles. I have kept this bike pristine and use it only occasionally in the summer. As you know, they can be difficult to start, and I have a bad kicker leg. Over the last two years I have been touching it up a little, polishing bolts, repainting the frame, etc. I took the carb off and cleaned the surface, and took it apart and cleaned up the inside float bowl. I took apart what came apart easily and cleaned the fuel strainer and so forth. I know it is back together correctly, which is not difficult anyhow. I did have to make a new gasket, but cut it exactly like the original. The float and needle valve (plastic needle) all looked like new. My thought is that the float is not coming up far enough to push the needle valve tight or the needle is malformed, but again it was smooth and the carb did not leak before taking it apart. Any thoughts? — Larry Bush, via email 

A: I’ve always liked Victors and I have worked on several. I still kick myself for passing on the opportunity to buy one years ago because I thought it was too costly. For the time being, I’ll have to settle for my Royal Enfield Bullet 500, a mild-mannered substitute for the high-spirited BSA. Regarding your problem, I suspect a couple of things. First, is the gasket you cut interfering with the hinge for the float? I often have to trim the pattern gaskets to keep them from bearing on the hinge and impeding the float. Second, it’s probably time to replace that plastic needle with a brass one with a Viton tip. I seem to recall concerns with the nylon needle not having enough mass to resist being pushed open by the pressure of the gas. That may be an old legend, but the Viton tip will seal better than the hard plastic. Just make sure they are the same length, otherwise you’ll have to go through the difficult task of setting the float level in an Amal Concentric. Also, on starting: if you have the energy transfer (ETC) ignition system it’s easier to sneak up on compression without fear of the bike kicking back. I rely on the compression release to get past TDC, and then give a firm stroke on the kicker, making sure to follow through to the end of the kicker travel. If you have a battery and points you follow the same procedure, but don’t turn the ignition on until you get past TDC. MC 



Related Content

Norton Electric Starter Conversion Kit

New stuff for old bikes: Electric starter conversion kit for pre-MkIII Norton Commandos.

1977 Yamaha XS750 Electrical Problems

A reader has electrical problems with his Yamaha XS750.

An easy way to ruin your wheels

Are you using soapy water to mount and dismount your tires?

BSA Victor Issues

Motorcycle Classics’ tech expert Keith Fellenstein looks at a detonation/pre-ignition condition in a...

Content Tools
RSS




Post a comment below.

 

Gregory Moores
2/21/2013 7:06:07 PM
Greg Moores here where are you living? Am in Lawrencetown at gmoores19@live.ca No Brittish bikes Hondas and Yamahas send me an email. Any truth to the rumor you want to revitalize a Vintage TT, Mike Herman mentioned it when I meet him at the drags in Greenfield if you are would like to help out

Martin Singleton
2/21/2013 4:17:48 PM
Hi , if you have to adjust the float level , rather than mess with the seat possition , you may want to replace the float with the updated adjustable float, [an improvement 40yrs in the making], thanks, Martin S. BCS tech dept

MY COMMUNITY
no image
Arnaldo
4/22/2014 4:49:12 AM
no image
GreggCB900F
4/20/2014 3:47:30 PM
no image
900cc
4/19/2014 3:12:02 PM
no image
RidingDogg
4/16/2014 7:37:29 PM
no image
jhutbeer
4/14/2014 9:35:30 PM
no image
900cc
4/12/2014 1:45:10 PM
no image
KEITHF
4/11/2014 4:29:22 PM
no image
900cc
4/10/2014 10:08:16 PM
no image
GTRider9
4/10/2014 8:35:40 PM
no image
KEITHF
4/10/2014 12:35:33 PM


The sound and the fury: celebrate the machines that changed the world!
First Name: *
Last Name: *
Address: *
City: *
State/Province: *
Zip/Postal Code:*
Country:
Email:*
(* indicates a required item)
Canadian subs: 1 year, (includes postage & GST). Foreign subs: 1 year, . U.S. funds.
Canadian Subscribers - Click Here
Non US and Canadian Subscribers - Click Here
 

Motorcycle Classics is America's premier magazine for collectors and enthusiasts, dreamers and restorers, newcomers and life long motorheads who love the sound and the beauty of classic bikes. Every issue  delivers exciting and evocative articles and photographs of the most brilliant, unusual and popular motorcycles ever made!

Save Even More Money with our RALLY-RATE plan!

Pay now with a credit card and take advantage of our RALLY-RATE automatic renewal savings plan. You save an additional $4.95 and get 6 issues of Motorcycle Classics for only $24.95 (USA only).

Or, Bill Me Later and I'll pay just $29.95 for a one year subscription!