AndrewTG

Thanks a lot. Im guessing there was mosture in the cdi and the atv is working perfectly after i baked the cdi. I really appreciate your help.

Ah i see Thanks for explaining that.The coil was replaced with the Genuine Honda part. So i wouldn't think its the problem.

The Battery is new. Never fails to start. yes i got OEM honda parts. Yes i have a multi meter and i have service manual. And if you wouldnt mind could you explain to me how the change in engine temperature can affect these parts. We can write off the oil temp sensor be cause the temp light doesnt come on right?

My 97 Honda fourtrax 300 Loses spark after getting up to temperature. When the engine is cool (77 degrees or so) the spark the spark plug is strong and the atv works just fine. After i ride it around for a bit maybe 10-15 minutes the spark becomes very weak or nonexistent. Any ideas what this could be? Ive replaced the spark plug, wires, ignition coil, check continuity in all of it, replaced oil. The other weird thing is the oil temp light never comes on other than a few seconds when you start the atv.