1986 KX250 no spark!

[grubbennett]

I bought a 1986 KX250, as-is, NO SPARK. Tested stator, nothing! Bought a new stator from Ricky Stators. Stator is showing 40-60 volts from the black w/red wire (large coil), and 383 amps. The white w/green and white w/red wires (small coil) shows .7-1.5 volts with my digital meter. Those same wires show 7 amps. I contacted Ricky Stators and they said my stator readings are what they should be. Next, I put my coil on another bike. It started right up! I put the coil back on my bike. THEN, I tried 3 different USED CDI boxes..NO SPARK! I'm not quite sure about the stator to CDI wires. My stator has white w/green stripe, white w/ red stripe, black w/red stripe, black w/yellow stripe. The CDI box has white w/green stripe, white w/red stripe, black w/yellow stripe, and 2 black w/white stripe, and green w/white stripe. I attached colors to colors except the black w/red, it is connected to one of the black w/white on the CDI box, it also goes to the kill button. (I disconnected the kill button for now) The other black w/white from the CDI is going to the coil. The CDI wire going to the coil reads 40 to 60 volts, the same as the stator! . NOTHING FROM THE COIL! I wired this according to a 1986 KX250 manual that the used parts place had. I couldn't find a CDI with the black w/red wire, only black w/white. I actually took the bike to the place and swapped parts there in the parking lot. What is going on? :yikes: PLEASE, ANY HELP????????? :bang:

 

[grubbennett]

I'm ordering the correct CDI box, has all the correct colored wires! I think that is the problem. The used parts place will refund my money for the used CDI box if it is returned within 7 days. I'm taking it back on monday. Any info will still be very helpfull!!!!!!! Has anyone had a situation close to this??? :think:

 

[RmTony]

sounds like a wrong part issue, but you should also check the magneto that could be whats bad... the bandit has it here

 

[grubbennett]

I put on the right CDI box. Now has bright blue spark!! Wont run, only backfires....changed the plug....backfires! I think the timing is off??

 

[grubbennett]

pain in the azz kick start!

I hear a lot about the kick start on these kx250 being chit! Mine is chit! Hard to test for problems with chit kick start. Any one know what usually causes them to slip? I mean other than previous owners abusing them. LOL. What parts might I need? :yell:

 

[grubbennett]

1986 Kx250 Funny **** Here!!!!!!

I pull started the 1986 KX250 due to chitty, useless, poorly designed kick start!! It runs......BACKWARDS!!! :yikes: There are no timing marks on my stator plate..only the line I scribed on it for reference before I removed it to replace the stators. Engine backfires....then runs backwards (runs pretty well too):bang: I retarded the timing, still runs backwards...NOW IT HAS MORE POWER!!!! :coocoo: Retarded the timing more, backfires....sputters.... :bang: The plug is clean, bright blue spark! WTF???? Should it be retarded even more?:bang: This is getting quite retarded!

 

[grubbennett]

It has the wrong flywheel on it!!!!! It's off of a KX80!!!! Someone, somewhere, put a bunch of stupid chit on this bike! I made it work on the KX250 for now though. :nod: Re-keyed it so the timing marks line up with the piston at TDC!!! It fu##ing rips!!! NOT IN REVERSE!!! :nener: Damn, I'm glad I didn't part it out!!!! :yikes:

 

[dirt bike dave]

Glad you got if figured out! That one had to be pretty tough to diagnose - you always assume a bike has the right flywheel on it, lol.

 

[grubbennett]

Thanks, now I need to fix the kick start. I'm pushing or pull starting it for now. I'll also need to get the right flywheel, because it has a slight vibration from the wrong flywheel. I don't want to ruin the engine! It was worth the time though! :ride:

 

[grubbennett]

The guy I got the bike from had the original flywheel!! He gave it to me, I installed it, and it works perfectly and it's in the original position on the crank!! Now I have to get to work on the kickstart issue :bang:

 

[2strokerfun]

- you always assume a bike has the right flywheel on it, lol.

Yeah. I'd rather have NO flywheel than the wrong flywheel on it.
Good luck on the kickstart.

 

[grubbennett]

I don't like the looks of the kickstart diagrams! Seems like alot of parts to f##k up! :bang:

 

[grubbennett]

Yeah. I'd rather have NO flywheel than the wrong flywheel on it.
Good luck on the kickstart.

Thanks. :nod: