AVikman

Little update, fan works as it should now. Rode for 30 minutes and no boil over, fan came on and off few times. It was the thermo-switch that was broken. Thanks a lot @konradand @lemurfor the help. Always learn something new.

I might try to connect a switch as well, seems like a good thing to have.

Great, just ordered a new thermo switch. Will let you all know how it all went. Hopefully this was it and everything will work as it should.

Well I had another go this morning with the bike, I tried to jump the thermos-switch again and the fan came on. I think I'd messed up last night when i tried it, the wire wasn't secured enough. Just so I get this straight, if the fan comes on when used with a jumper wire it tells me that the thermo-switch is kaput yes? Best regards

Thank you Konrad, I will give them a call and see what they says. Will report back if I find out what the problem was.

I did just try that, the fan did not come on, and yes. I will be calling my local bikeshop tomorrow, I'm in way over my head. Okey, so the part that I circled earlier I don't actually need? Btw, when the fan didn't come on when I connected a wire between the two. What does that tell me except that the fan did not work?

How is that done? Thought that I needed (see picture) this to convert from DC to AC? manuals states (fun module) which I don't seem to have. Just the Bobina, big black box with curved edge on one side and the silver box. I've tried to use the multimeter to see if I can get a reading from the thermostat without any luck. just reads 0 on all settings of the multimeter.

I got the fan to spinn with the 12V battery charger.

Hey guys Just bought my second trials bike, old used one. Wanted to try the 300cc. Anyways after some suspension fix, greasing the linkage, changing all the fluids and all that good stuff I wanted to take it for a spinn. Rode for let's say 10 minutes or so. Got back to my driveway and let it idle for 30 sec to a minute. It boiled over and I believe that the fan did not come on. Took the fan and the radiator of the bike, hooked the fan to a battery charger with some wires and the fan worked. So took a look at the electrical system to see if I could see any broken connectors or wires. All seems good to me. I have the Ducati system and I believe the "Fun Module" is missing, it's stated in the parts manual as number 2. Can't find a wiring diagram for my bike, just the 2003 with the Ducati system and that does not show a fun module I believe. Will show you guys some pictures from my bike with what I got as far as electrical parts Third pictures shows everything and the wires in the middle is where the fan goes and no alternator is to be found. As far as electrical system my knowledge is pretty much zero. I did have a look at the water pump to see that nothing was seized or so. I found oil behind the water pump cover but no water in the gearbox oil when i changed it. But is it supposed to be oil next to the water pump? picture below Would be thankful for any replays and insights If your having a hard time reading this it's probably because i'm not a native English speaker. Best regards Adam