I just checked my gas cap during lunch and could't find any sign of a
vent hole whatsoever. For tonight's ride home from work, I think
that I'll loosen the cap on the tank and see if that helps. The cap
tightens down very snuggly when turned and I have had no problem with
gas spilling out around the rim.

In reading my owner's manual just now, I think that I may have found
the answer to my problem. It states "If fuel supply is insufficient,
the engine power drops sharply, backfire appears in the carburetor,
and the engine speed does not correspond to the normal position of
the throttle control handle. In this case first of all make sure the
hole in the fuel tank plug, through which the tank is vented to
atmosphere, is not clogged." Bingo, the symtoms described are
identical to what happened to me this morning. Not being exactly
sure what is meant above by the term "fuel tank plug", I consulted my
parts manual where the gas cap is referred to as a "plug." Looks
like I need to drill a small hole (say 1/16") in my gas cap to ensure
proper ventilation of the gas tank. Does everyone else have a hole
in their cap? I know that my Enfield and Meridan Triumph both have
breather holes in their gas caps. Thanks.



<John Robertson wrote:
I have a new neoprene style rubber gasket on my MT10 gas cap so it
won't leak around the rim - the breather hole is in the top center of
the cap, looks like a dimple, but should be a tiny hole...John :-#)#>


> At 6:15 PM +0000 12/15/04, Russ Heath wrote:
> >I'll certainly check the gas cap situation. I may have it screwed
> >down too tightly to guard against fuel splashing out. I understand
> >the rationale against inline fuel filters. It will be an easy fix
to
> >eliminate them and see if that helps. No, I currently am not
running
> >clear fuel lines. The small, inline filters are clear, but the
fuel
> >lines are opaque (black rubber). Thanks.
> >
> >
> ><keith.gilbert wrote:
> >My gas cap vent hole needs opening up and creates a vaccum if
screwes
> >all the way down...inline filters cut down the flow of gas by
> >constricting gravity feed (per Lloyd) and the pepcock has a fuel
> >filter so are not needed...use clear tubeing...yes? I'm having
> >troubles because it is a brand new engine but yours could be
> >similar...maybe valves?>
> >
> >
> >> ----- Original Message -----
> >> From: "Russ Heath" <heathr@r...>
> >> To: <dneprheads@yahoogroups.com>
> >> Sent: Wednesday, December 15, 2004 9:48 AM
> >> Subject: Re: [Dnepr Heads] MT-11 Power Goes South
> >>
> >>
> >>
> >>
> >> I'm assuming that the gas cap breathes, as the former owner had
no
> >> problem. I guess that it could be blocked/clogged. Where do I
> >> look? The fuel lines to each carburetor have inline filters. I
> >> haven't investigated the carburetor jet size yet. Thanks.
> >>
> >>
> >> <keith.gilbert wrote:
> >> Does your gas cap breathe? Do you have inline filters to the
> >> carbs? What are the jet settings on your carbs? Just some of
the
> > > things that make me love my Rosie.>
> > >