Hi Norm,
Ok ran with the airfilter housing removed. Did it make any difference? Ummm perhaps a tad less smoke - there is still very noticeable noise when the engine is at full revs, it's not a happy full throttle - to me it sounds quite possibly like incomplete combustion of fuel. Hard to explain.
Of course I had to mess with both the adjustment screws, well just to see if either of those helped. The 'pilot screw' which is as I said only turnable around 1/4 of a turn total, seemed to do nothing at all - as I suppose you'd expect from 1/4 of a turn range. Seeing as I cannot have ever changed that I don't see that could be the issue.
The larger plastic screw.....well that has a lot of range on it - clearly it alters the idle speed. I've got the workshop handbook pdf on the GXV and used a cheap tachometer to set the proper speeds a while back. At one end of adjustment it has a very low idle, which when you add throttle results in a further dip of the RPM and a lot of smoke before getting to full RPM. When set the other way its a higher RPM, less smoke to full RPM.
I am sure this screw is set wrongly......and likely the governor is set wrong as well - as of recent times it's had a very slow and bad respnose to hitting heavier grass etc - which means you have to slow, cop a load of smoke etc.
On the air filter housing - is a very fine line between having it sealed against dust ingress - and making it unhappy with the air flow. I will note I still have the foam prefilter on the airfilter, all are in very clean condition.
I did seal up the housing's edges with some grease etc to try and keep a dustproof seal on it, the idea being all airflow came down the high mount inlet point.
Is there a way I can reduce the fuel mix richness? When I go from idle to stop, it will often do a loud explosive backfire.
Last edited by N1KK0; 08/06/25 03:32 PM.
