It sound like you're describing the phenomenon known as' vapour lock'
Petrol (sorry) 'gas' vapourizes in the carbs and lines causing a
moderate pressure buildup. I figure that this pressure prevents the
normal flow of fuel through the system. When it happens to me I find
the engine starts after extended cranking but who likes to drain their
battery like that?. Some means of venting the vapours would be handy,
like removing a fuel line, but beware of spraying fuel onto possible
sources of ignition.(put your ciggie out first).
> Subject: Hard to start when warm
> Date: Wed, 19 Aug 1998 12:10:25 -0400
> From: Larry Macy <macy@bblmail.psycha.upenn.edu>
> Reply-to: Larry Macy <macy@bblmail.psycha.upenn.edu>
> Gotta quickie. After all the tuning and such to get ready for inspection,
> the Midget runs great. The only problem I have is after I drive it for a
> while, and it is hot, it is hard to restart if only off for a few
> minutes.
> Timing is set to 16 BTDC
> Plugs are at 0.02
> points are 0.015
> (best as I recall off the top of my head)
> Timing is a little advanced, book says 10 BTDC
> Plugs a little wide 0.015 (I think).
> Weber DGV
> It really runs great when just cruising, just not after shutting off for
> a few.
>
> Any ideas?
>
> Larry Macy
> 78 Midget
>
> Larry B. Macy, Ph.D.
> macy@bblmail.psycha.upenn.edu
> System Administrator/Manager
> Neuropsychiatry Section
> Department of Psychiatry
> University of Pennsylvania
> 3400 Spruce St. - 10 Gates
> Philadelphia, PA 19104
>
> Voice mail 215 662-2890
>
>
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