I have a Honda trx 420tm the problem i have is on a warm to hot day while driving the motorbike it will stop the coolant level is fine the fan doesn't seem to be working I have check the fuse for the fan it's ok .The coolant indicator light is not on. When you leave the motorbike for a little while 1 min it starts goes 150- 200m then it stops any ideas.

Question edited for clarity.
Question moved to model category.

Here is the engine.

https://www.google.com/search?q=honda+trx+250+engine+for+sale

Bayou wiring harness

https://www.google.com/search?q=Kawasaki+Bayou+300+wiring+harness+replacement

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I am not exactly familiar with this particular atv.. start with removing the gas tank, this should allow you to see where the fan is connected and bolted to. It should be a pretty straight forward operation.

Honda 2004 TRX450R Google Search

I take help from online websites that have this service like helping in repair some like reliable-store have instant help.. others are a bit slow which I don't prefer... rest is up to u.. U can also get free manual works fine .

Repeat the process with a manual. Sounds like shaft not engaged.

the fan doesn't run unless they get really hot take the front plastics off and check the coolant in the radiator instead of the plastic jug

its running lean. not sure if thats a carb or fuel injection. you need to richen the idle somehow.

heat up the engine put is somewhere warm or hot

Yep. Probably most definitely the clutch, clutch cable , clutch arm at crankcase bad plates or discs. Also check the crank case for proper fluid level. I think those have a wet style clutch that's in the crankcase with the fluid right ? I had one of those but its been years. If I remember right I think there is a spring under the clutch basket that's connected to the throw out rod . If that failed it won't engage. Dump the fluid into a pan and see if ya got some spring chunks in ye old fluid.

The transmission has to be reinstalled in neutral. The shift drum should give away how to do this!
If you can't figure out how to accomplish this.. its time for a professional intervention!! (professional mechanic!)