[Healeys] Rough running 100M

Alan Seigrist healey.nut at gmail.com
Wed Aug 2 19:29:51 MDT 2017

Larry -

Sounds to me that your fuel pump capacity is degrading or there's some sort
of clogging going on somehwere along the fuel line into the float bowls.

Next time you get the sputtering immediately turn off the motor and coast
to a stop on the side of the road.  Pop off the float chamber lids and if
you see little or no fuel in one or both bowls, then you know you have a
fuel delivery degradation problem.



On Thu, Aug 3, 2017 at 7:35 AM, Larry Paterson <Larry at patersondesign.ca>

> Hi folks – here’s one for you to ponder.  For the past many years I’ve
> raced my 100M without a problem.  Lately however at around 4500 RPM under
> load it balks and stutters running quite rough.  I’ve checked timing,
> changed the condenser several times checked carbs and all the other usual
> stuff.   When not under load it revs freely.   The motor has a billet
> crank, roller rockers, aluminium head, 100S pistons, lightened flywheel etc
> and regularly ran up to 6500 – 7000 <6500%207000> RPM with no issues. It
> also has a Mallory distributor and is running 24 degrees of advance. Any
> advice on where to look next would be much appreciated.
> Thanks
> Larry Paterson
> 100M, BN7,
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