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hi to all.
i have this outboard engine ( yam,40hp 3 cylinder,2stroke,electronic ignition ) but i start it and it will only throttle to a fast idle (at idle upto very low revs,all is well ) when i put the throttle up a little more or above ( say a third throttle ) the engine studenly gets very lumpy.(almost like the choke has been put on ) ive put a strobe gun on it to check the timing and i find that when it does start to run lumpy the fireing becomes very iratic..
basicly as the enigine revs increase the strobe light gets faster as it should until i reach the revs/throttle ( aprox quater to a third of the throttle ) and on the strobe light the fireing of each cylinder becomes much less often.almost like it might only be fireing on aprox every 3 reverlution of the engine insted every of one revolution. plus ofcause each time the strobe lights up i can here the engine fire ( one stroke of power ) but its only fireing say aprox 3 times a second .
im almost cirtain its an electricle fault but i want as much advice as i can from any one who thinks they can help?????
i hope ive described it well enough
ive cleaned up the LT wires which were a bit coroded on all 3 coils,given the plugs a damn good clean ,im very sure the carbs are fine too,but still the problem persists..
i have this outboard engine ( yam,40hp 3 cylinder,2stroke,electronic ignition ) but i start it and it will only throttle to a fast idle (at idle upto very low revs,all is well ) when i put the throttle up a little more or above ( say a third throttle ) the engine studenly gets very lumpy.(almost like the choke has been put on ) ive put a strobe gun on it to check the timing and i find that when it does start to run lumpy the fireing becomes very iratic..
basicly as the enigine revs increase the strobe light gets faster as it should until i reach the revs/throttle ( aprox quater to a third of the throttle ) and on the strobe light the fireing of each cylinder becomes much less often.almost like it might only be fireing on aprox every 3 reverlution of the engine insted every of one revolution. plus ofcause each time the strobe lights up i can here the engine fire ( one stroke of power ) but its only fireing say aprox 3 times a second .
im almost cirtain its an electricle fault but i want as much advice as i can from any one who thinks they can help?????
i hope ive described it well enough
ive cleaned up the LT wires which were a bit coroded on all 3 coils,given the plugs a damn good clean ,im very sure the carbs are fine too,but still the problem persists..
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