harryharls

Ha ha, that's embarrassing! Thanks for the reply though Clarke. I'll copy and paste to Trials Central then...

Hi Guys, My first post on here, I'm hoping somebody can help as there is so little information available on the web for Gas Gases of this age. My old (but reliable) year 2000 250 (249) TXT runs absolutely fine generally but I've very recently road registered it and this overheating problem has only reared its head since I've taken it on relatively long runs (only a few miles though!). I noticed that it gets extremely hot on the road, and only at low speeds really. So much so that it actually smokes from the exhaust, not normal 2-stroke smoke, but hot smoke smoke! It smells like burnt oil...you know, bloody hot oil! The whole exhaust system is ridiculously hot, far too hot to touch, even the silencer. So hot that it's heating up the frame (and petrol tank!!) around it. Strangely, the radiator isn't boiling over but the fan is running of course and it must be close to boiling. I'm sure that the water pump is working correctly too, I've inspected the vanes and the circulation of heat seems fine through the pipe and rad. My thoughts are... I've been running it at a fuel/oil ratio of approx 50:1. After researching it seems that this might be excessively high, perhaps it should be 80 or 100:1 but again, information online is hard to find. Could this alone be the cause of the overheating (causing a lean running condition)? I've also been using Silkolene 'off-road' 2-stroke oil, I've read somewhere that apparently Gas Gas suggest that Silkolene oil should be avoided, is this true? I've come from enduro on a 2-stroke KTM where 50:1 and Silkolene oil have been absolutely fine. Any advice anyone? Many thanks in advance