hey guys, i have got a 95 scrambler 400, i am loosing spark when cranking, i have replaced the cdi box, coil wire end for spark plug, and cleaned up all the grounds and connections. I have spark when it starts cranking then i lose it and when i stop cranking it comes back.
this is driving me insane.

Any help would be great.

Thanks.

 

sounds like stator shot

 

ok, i am still working on the bike, seems as the day goes on and the weather warms up it is getting closer to starting, i have checked the coils with a meter and all seem ok. i think that something may have gotten wet and now as it dries the spark is coming back.but not sure. still have not gotten it started.
will keep posted.

 

Exciter coils in the stator bad about going out on the older 2-strokes. OPT

 

ok, i have replaced the exciting coil, ignition coil, and cdi. I have a spark but still will not start. Could a shorted starter stop the bike from firing? There is no pull starter on the bike so i have to use the starter, it sparked and hissed and now i have a good spark. I am not sure what else it could be. Any help would be great

Thanks.

 

Has the carb been cleaned? Plus have you checked compression? If less than 100 psi,could be part of the problem? OPT

 

Just rebuilt top end, compression over 130, have not rebuilt carb yet that is going to be next. the motor is getting fuel, plug is wet when i take it out. just rebuilt starter motor will try now to see what happens.