my h-22 is spitting and sputtering once it warms up does not do it when in neutral only when it warms up and there is a load on the engine. i believe it is electrical. i also know from experience that honda run best with denso spark plugs and i put iridum spark plugs in it could that be the problem. i also have a msd digital 6 system with an hvc external coil. and last may knock sensor keeps going off and i am wondering if maybe the sparks plugs are getting to hot and causing detanation. can anyone give me any advice.

 

check the numbers on those plugs and make sure they are the right heat range. If the heat range is too high that could be your problem, but iridium plugs shouldn't matter. I assume with an ignition system like that, that you use premium gas, but maybe try getting it somewhere else and see if it could be something as simple as bad gas. just a shot in the dark

 

MIL codes?

~boom