Since moving the pump to advance it cured your problem I would be very curious to see how stretched the chain is. Checking the chain stretch is very easy and setting the timing before checking the stretch seems like putting the cart before the horse since if a new chain was required then the timing likely would need to be reset again. Spend and hour, pull the valve cover, check the stretch, might as well check and adjust the valves if neccessary while you are there, and if needed roll in a new chain. RT

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