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have the flat tappets been replaced with the roller replacement kit? If not I would certainly start there .
My 1200 8v is doing something odd. It starts fine so long as I don't touch the throttle. It idles fine after starting - again so long as I don't touch the throttle. If I touch the throttle it runs erratically ( on one?) and usually dies. It improves it's tolerance of throttle as it warms up. After 5 minutes, it's fine. Does it every time.Ideas?