Re: REFLECTOR: Lyco 540 probs

[Bob <bgins@intrstar.net>]

According to Jim Rembaugh of the local G&N engine shop:

Check the manifold pressure.  If it is reading high, you probably have an intake
(air leak).  If it is low, chekc the mixture setting, it may need adjusting.
Hope that helps.

Bob

John Robarge wrote:

> I have a consistent problem with the Lyco 540 installed in my XL.  At low
> power settings, it surges from 600-1200rpm randomly and roughly with an
> apparent cycle of about a second.  At high power, it runs great, very smooth
> and all other indications normal.  It has been suggested that it might be
> the close confines of the cowl not allowing the engine to cool properly.  I
> don't buy it because the guages say it is a cool as a cucumber.  Others say
> it is the mixture and I should get it re-calibrated.  This might be, but
> adjusting the mixture has no effect.  Still others say it might be the
> engine driven fuel pump, but again, the guages say I have excellent fuel
> pressure.  The flow meter indicates very smooth flow at higher RPMs, but at
> low RPMs the flow obviously changes with the surge.  I can't tell if the
> flow change happens before the RPM change or the other way around.
>
> If anyone has experience with this problem or it's possible solution, I
> would really appreciate a repsonse.
>
> John Robarge
> 140JP