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Message: <blockquote data-quote="Tazza" data-source="post: 3713" data-attributes="member: 82">It sounds like it leaning out, that can cause it to surge. When there is too much air without enough fuel it will rev higher, but it also burns hotter and creates more pressure. This can damage head gaskets and burn valves. Its something to try and avoid if you can, as far as i'm aware small doses like your getting now won't cause any damage, but keep an eye on it.I can see that it could be vapour lock, but usually that will just cause it to stop working.Try changing filters again as ken said, i'd try moving the fuel hose away from the exhaust. Add more fuel hose if needed to get it away from any heat sources.</blockquote>