Re: Help with Mad Duc Air filters (Reckless_Kelly)
Melted foam on the intake or exhaust valves, valve seats, trace the missing filter to the cylinder that lost the filter. If it runs fine you dodged a bullet. If it's popping and missing I'd check the plugs for being fouled by the foam. Check everything! The knocking isn't a good sign but doing it 5-7 minutes at a time sounds odd like something is floating around somewhere in the motor. More than likely the owner beat the crap out of his better running bike after you gave it back to him and something else might have failed. Considering he didn't have common sense to run the bike with filters, anything is possible. Mad Duc filters, cost-wise are a cheaper source for filters. I always stayed away from them for a number of performance reasons. Keep us informed.
Melted foam on the intake or exhaust valves, valve seats, trace the missing filter to the cylinder that lost the filter. If it runs fine you dodged a bullet. If it's popping and missing I'd check the plugs for being fouled by the foam. Check everything! The knocking isn't a good sign but doing it 5-7 minutes at a time sounds odd like something is floating around somewhere in the motor. More than likely the owner beat the crap out of his better running bike after you gave it back to him and something else might have failed. Considering he didn't have common sense to run the bike with filters, anything is possible. Mad Duc filters, cost-wise are a cheaper source for filters. I always stayed away from them for a number of performance reasons. Keep us informed.