hi , two strokes :cry: , said I'd never have another one then bought the Munga Is the slide a flat or cylindrical one ,, because I've had the cylindrical ones where the slide pin has worn letting the cylinder to turn so the tick over adjuster pin ends up on the bottom of cylinder slide :-( just checked back your slide is shut ,, next two stroke problem air leaks in crank case IE case gaskets head gasket ,, and the best one that every one overlooks crank bearing seals , just helped a neighbor rebuild a voskod because he was having a job to get it going , He said he'd tried all sorts I said strait away crank seals ,, runs well now there replaced