[SEL] Economy engine Plug Fouling

[R & M Ingold]

A few thoughts on this.
If the carb throat is too large, then the mixture will HAVE to be very rich 
for it to get any fuel at low gas speeds.( Even if it is ok for full on load 
and original speed.)
So, to run an engine at slow speed and no load, the carb bore needs 
reducing.
The half size models I make, (1 1/2 inch bore) run well on a 3/16 venturi at 
the needle and 1/4 lead in and out. This gives the gas some speed and allows 
fuel to be drawn up and mixed with the air.
I have made reducing inserts to fit in a few full size engines. They solved 
the trouble.
A choke plate partly closed helps but is only a band aid solution.
So, if you are keeping an engine, a few hours work will fix this problem for 
good and all. Just dont expect it to work hard with the mods.
Reg & Marg Ingold.
Newcastle, NSW, Australia.
randmingold at hotkey.net.au
http://www.oldengine.org/members/randmingold

----- Original Message ----- 
From: <FRM8198 at aol.com>
To: <sel at lists.stationary-engine.com>
Sent: Friday, November 04, 2005 3:15 PM
Subject: Re: [SEL] Economy engine Plug Fouling


>
> In a message dated 11/3/2005 3:31:54 P.M. Pacific Standard Time,
> jbcast at charter.net writes:
>
> Check  your ignition Francis, sounds like it may be weak.
>
>
> JB, Dave, & Jim,
> Thanks for the replies.
> I seem to be get a nice blue spark.  This engine uses  a modified HECO
> magneto that is chain driven.  My magneto person is  not too impressed 
> with this
> type of magneto.  Furthermore, I can't  seem to find very much information 
> for it
> on the Internet.
> Yes, Dave, I tried a 3095 and a Wards #1 (take  apart) spark plugs.  I was
> able to disassemble the Ward plug and clean  it.  Regardless of what plug 
> I was
> using, the engine would run for short  time before the plug fouled.  I'll 
> try
> to find a "X" Champion type.
>
> Francis  Maciel
> Santa Maria, CA
>
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