Jump to content

Losing Petrol


hamill_glen
 Share

Recommended Posts

Out on the bike today and I notice the bikes was losing a good amount off petrol from the over flow on the carb !so went back the the van and took the carb apart and cleaned the jets etc and put all back together and worked fine . Then after about 45 mins same thing happened again ! Back to the van etc striped carb apart cleaned it put all back together n still the same problem . Tried that coulple more times and it kept losing petrol even when the bike wasn't started . What could the problem be ?

(2013 sherco290 )

Link to comment
Share on other sites

 

 
 
 
 

Check the needle valve pin is clean and moves up and down freely in the seat chamber. Clean the chamber using a cotton bud attached to a slow speed drill with a little autosol polish.

Check the point on the needle valve hasn't got any marks around it ( scores)

Do u have a fuel filter fitted between the tank and the pump?

If there is ***** in the tank then this will get to the carb via the fuel line and will not allow the needle valve to ' shut' causing overflow.

Edited by lockie28
Link to comment
Share on other sites

 
 
 

Can't help with the problem, but congratulations on being one of only 6 people left in the world who know how to spell losing. :thumbup:

Too scared to post anything now did not know our spelling would be checked?

Back to the petrol leak! Is the carb syphoning out of the overflow pipes aka Beta? The easy fix in this was to cut a hole half way down each of the overflows!

Link to comment
Share on other sites

 

Hang on.  Before you do any of the above.

I am assuming that your Sherco is a yellow framed,  "tank under the seat" model?  

If so, then your problem may be the pump bypass loop, which is located under the rear mudguard.  It is a black rubber pipe, which runs from the fuel pump, up the inner mudguard and loops up near the fuel tank filler cap before returning back down.  

At this high point there are one or two fuel vents/breathers, which have a small screw to loosen, which vents air from the system.  It may be that the screw or screws have vibrated loose, allowing fuel to escape, run down the vent pipe to the carb and appears to be the carb overflowing.  

This happened to mine.  

Just remove the rear mudguard to see if this is the problem.  Check the hoses and their clips as well. 

 

And fit one of these, to keep dirt out of your fuel tank:

http://www.ebay.co.uk/itm/sherco-fuel-cap-cover-/272330761828?hash=item3f682da664:g:~q8AAOSwyQtV3EuR

Edited by stpauls
Link to comment
Share on other sites

 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
 Share

×
  • Create New...