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General Category => General Discussion => Topic started by: Vince in Milwaukee on June 10, 2019, 05:12:17 PM

Title: LeMans 3 - leaky carb
Post by: Vince in Milwaukee on June 10, 2019, 05:12:17 PM
Looking for some help for a leaky carburetor on my LM3.  Installed a new float needle and seat (this has fixed the problem in past years), but it still leaks gas, although not as badly.  Tips / advice most appreciated as we've finally got some nice riding weather here in Wisconsin.   
Title: Re: LeMans 3 - leaky carb
Post by: Chuck in Indiana on June 10, 2019, 05:19:40 PM
Float height set properly?
Title: Re: LeMans 3 - leaky carb
Post by: Guzzidad on June 10, 2019, 06:38:49 PM
   What Chuck said. I just had to replace 2 floats because they filled with gas.
Title: Re: LeMans 3 - leaky carb
Post by: sdcr on June 10, 2019, 07:07:45 PM
Over the years, I've had to renew the float bowl nut gasket a few times.
Title: Re: LeMans 3 - leaky carb
Post by: guzzista on June 10, 2019, 07:30:57 PM
Other places I have had leaks . 1: banjo fitting.  The 6mm fiber  washer  can  allow leakage if not replaced. I like to add a  aluminum washer  as well on the outside of the aforementioned washer , particularly on the left side carb where the access is  more limited and the view not as good. 2.  The bowl O ring even if this may be a no brainer to seasoned guzzisti. The recent ones I have come across seem to harden sooner due to ethanol fuel. Combined  with  a squished bowl nut washer, makes leakage more likely.

http://www.mgcycle.com/index.php?main_page=product_info&cPath=34&products_id=1500
Title: Re: LeMans 3 - leaky carb
Post by: wirespokes on June 10, 2019, 08:54:22 PM
That pretty well covers it except for the fuel line. They tend to age right at the point where they attach. Snipping off a quarter or half an inch usually fixes.
Title: Re: LeMans 3 - leaky carb
Post by: SED on June 10, 2019, 11:32:42 PM
Check that the float is not hanging up on the pivot or its supports.  I installed new plastic floats and one started to hang up after a few months.  Trimming the edge of the float pivot solved it.