Only get spark on one coil

[Billbenton17]

I have a 1983 Yamaha Venture 1200 gen 1 it sat fore 7 yrs or so not runniit only fires on 1 cylinder fires sometimes on 2 so I changed out some coils did some testing figured my pick up coils are bad but can't find any parts been looking around for a while any help would be great full

[frankd]

The most likely cause of your problem is that the carbs are gummed up with crud from old gasoline. You're message heading says only spark to 1 cylinder, and then in the body of the message you say that it's only hitting on 1 or 2 cylinders. Did you check for spark on all 4 cylinders? Take an old sparkplug, and put it in each plug wire and make sure the base is grounded to the engine. Crank it over for a couple of seconds and see if you do have spark. Check this on all 4 cylinders. If you really only have spark on 1 cylinder, you probably have a TCI (Transistor controlled ignition) module that bit the dust.

 

Frank D.

[CaseyJ955]

Check for rodent damage to the wiring loom. Depending on where it sat you might have a robust nest in there somewhere made out of wiring insulation.

[Billbenton17]

Yes I checked spark on all 4cylinders everything ohms out what's weired when it hits on number 2 cylinder the starter makes a clunk nois then back to normal I had the carbs gone through fresh gas no cloggs or gummbed up the pick up coils check out all connections are clean and tight the only thing I can think of is the cdi box is bad

[Billbenton17]

I do believe ur right Frank d I'm thinking the same thing TCI is toast

[Billbenton17]

I can spend the bucks on the ol girl only gave 100 bucks fore it and it's in really good shape really appreciate the reply guys ill take any and all advice

[rbig1]

well its a bear to get too but you need to move it anyway. Take tci unscrew the box open it and see if its wet or green or burnt spots. then relocate it to top of air box. I just Velcro mine to air box lid. Clean as many connections as possible. Check ground locations.

[Billbenton17]

Oh I know what u mean I had it out today looking at it and it's all corroded up and stuff on the inside this box is a mess think I'm going to order one I've read that dingy sells aftermarket cdi boxes does he still sell them and how do I get ahold of him

[rbig1]

Well it just hit me these plug caps need cleaned once in a while they unscrew off the plug wire then look like this I believe there is 5 ohm resistance. don't over clean the slug will not take it.

[Billbenton17]

Yup all clean and and good contact