[Spridgets] Runaway motor

[Jim Juhas]

You need air and fuel to run that fast, so only being rich seems 
unlikely unless something is pulling the throttle plates open.  Are 
these HS2s or some other variety of SU carburettor?  But, also check 
timing, and you mentioned a "different set."  Did you try it with the 
originals with different results?

Jim
1957 MGA Coupe #311

Joe Lansing wrote:
> After a used motor swap I bolted a different set of
> SU's on and fired up the engine. It immediately revved
> to about 4000rpm and I shut it off. The idle set and
> linkage appears about normal. What can cause this?
> Chokes aren't hooked up.
>
> Is it something weird like the carbs are set really
> rich and I have an air leak at the intake???
>
> Joe