Quote Originally Posted by Andrewpv01
Change the leads and spark plugs. If the leads have too much resistance it will run fine on petrol, but not on gas.

Andrew
Sparks plug were new at last service <1000kms ago. I'd have thought the leads would have been changed at the same time, as the crowd I took it too specialise in Carbs and Gas.....

I found the idle adj screw and have sorted that angle but it still "pops" back through the carbs.