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biggeffory

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  1. @jrsunt was it normal for the fan to turn on and just never go off?
  2. UPDATE So I’ve installed a new (2nd hand) impeller and tested it by replacing the radiator with some clear hose and it’s definitely pumping the coolant. I’ve also replaced the radiator with one that doesn’t leak. Took it a run this evening and I still get the feeling that it’s overheating. The fan comes on and stays on, never going off - this can’t be right can it? And it smells as though something’s burning after you ride it hard. I didn’t see any coolant being expunged out the overflow which is good but maybe I just missed it… I don’t even know what the question is anymore. I guess I’m asking does it sound like it’s overheating? And what else can I try to prove/disprove the issue?
  3. Ok thanks for the tip @richt. I managed to scrounge a second hand but functional impeller so gonna fit it and fingers crossed the overheating is no longer an issue. But I might try repairing my broken impeller with the loctite anyway, keep it as a backup 😉
  4. I took a video of the spinning impeller but it's an illegal file type here so the pictures will have to do. The first picture shows the impeller on the shaft and can freely turn - I was able to spin it, zero resistance. Definitely gonna replace it and check for overheating. Will update here when the verdict's in. Thanks to all who've commented so far :+1
  5. Just checked and the impeller is turning freely on the shaft! Needs a new one I guess? Yamaha charge 62 GBP for a new "impeller assembly" - my god! Any way I can fix rather than replace? Maybe a second hand impeller (not the full assembly) will do the job? Anybody know where I can get one?
  6. It has always overheated since I've owned it unfortunately. I took most of the engine apart and replaced what looked damaged but maybe I've missed something. When I start it up and the fan comes on, it never goes off. So I kill the engine and let it cool before running it again. This is currently the only way I can prevent it from overheating. When it has cooled naturally and I start it again, the fan isn't on telling me the thermostat and fan are fine. The Radiator is a little beat up but functional from what I can tell. So I agree with you, it's something else.
  7. Am I right in saying that if the cooling system (all of it's components - pump, fan, rad, thermo etc.) are working correctly, that the engine shouldn't be overheating? Or is there other factors that can cause issues e.g. can the engine be generating too much heat (under normal usage) that the cooling system isn't adequate? Also, the fan shouldn't stay on constantly (once it starts) either?
  8. OK, will certainly give this a go (undoing the top hose and trying to stop the coolant), to test the pump/impeller. I recently changed the head and base gaskets and torqued them down to spec so that (hopefully) isn't an issue. Thanks for the help! :+1
  9. I will double check it to be sure. What's the best way to test the impeller is pumping the coolant properly? The impellor shouldn't turn on the shaft when I fit it right? Or can there be some movement?
  10. As a trials bike, 100%. I have other bikes for going fast. I usually ride 2nd or 3rd gear sections and hill climbs etc. Nothing out of the ordinary. I also very rarely ever rev it out, as I've no need. So it shouldn't be overheating based on how I ride it.
  11. Hi, I have a 2004 Scorpa SY250 (with Yamaha TYZ250 engine) and it keeps overheating. It takes a good run to get it to overheat but I know it's overheating because coolant is purged from the radiator cap overflow hose. And more recently it actually blew coolant out of the radiator and created a radiator leak. The fan also runs non stop, once it starts, even if the bike is kept moving. Things I've checked: - It has coolant, engine ice (proper stuff) - The water pump works - The fan comes on (so the fan itself and the thermostat is fine) - The radiator has flow, the coolant can go in the top and out the bottom so there are no blockages So it seems to me that the cooling system itself is fine but the engine is generating more heat than can be cooled; I've no idea why though. This is my first trials bike and I love riding it but currently I have to turn it off every 15 mins to avoid overheating it, which isn't great. Not sure what else to do with it, but would love to sort the issue. Any ideas or suggestions are greatly appreciated 🙂 Thanks
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