[rossqs]

I have a 1990 fourtrax 300 that was not getting any spark, the plug is good (tested on other four wheeler) and I replaced the wire going from plug to cdi box. I dod not get any spark and put on cheap cdi box (did not know importance of poem at time). It immediately smokes and blew during start. Do I need a new oem cdi box or is the old one possibly good and the problem is something else?

 

[Goober]

There are 3 generations of TRX300 and at least three part numbers of CDI.

Why did you change the wire? Was it broken?

If i thot the CDI was bad i would heat in an oven at 200F—for at least 3 hours—connector side up. Not hotter, but longer would be OK. Let it cool completely before you take it out.

 

[rossqs]

It is that 1990 generation. (89-92 I think). The wire was frayed. I put the cdi in the oven, but it still did not get spark afterward. it also did not blow like the last one did though. any thoughts?