... but headers were red hot.
... Fan didn't come on but it never does. I tested it last year and it does work (didn't test switch).
The sensor is the other possibility! I can test that at the same time as the fan switch. It was very heavy rain Saturday with a lot of spray.The only symptom over heating was a load of steam when I parked up, the bike was riding fine. Not sure when I will get to work on it, but I will give an update!
... I left the bike running for 5 minutes when I got back, fan didn't come on (as normal), but I didn't get a red light or anything. Radiator (and all corners) was hot. The pipes in the corners were not quite as hot as the fins on the side of the engine, but I couldn't keep my hands on them for long. The water pump itself (and hoses going to it) were hot. When I took the cap off the radiator (turned engine off and left a few mins) I got a good hiss for the first part of opening. I started the engine with the cap off and could immediately see loads of bubbles in the radiator. ...
...The only symptom over heating was a load of steam when I parked up ...
As a precaution I would change the thermostat, they are easy enough to fit and rules out one possible source of your problem.
would be great if it is just a bit of rain in the sensor... I saw loads of little tiny bubbles in the top of the rad when I started it, I only left it on for a few seconds as i didn't want it to spray out. When I've had a blown HG on a car in the past, it's been a bugger to start and drive. Also you can see the oil and coolant have mixed when you check the reservoir. Haven't got any of those symptoms so far, so fingers crossed for it being OK. I wouldn't do a head gasket replacement myself, I've never opened an engine.
Quote from: unfazed on 06 February 2018, 11:09:16 amAs a precaution I would change the thermostat, they are easy enough to fit and rules out one possible source of your problem.Sh*t i forgot to write that