Guest Posted November 24, 2016 Posted November 24, 2016 So I've just turned 16 and got a 2009 yamaha tzr50 2 stroke. It's de-restricted and manages 50mph at the moment. It's got an arrow pipe on it, it been upjetted and tweaked to run a bit richer and also being geared for good acceleration and speed. Recently when I've been at 9,000 revs for about a minute (redlines at 10,000 and maxes out at 12,000) the engine temperature light comes on and stays on for a while, then eventually goes out. Bear in mind it doesn't have a fan. The bike is definitely not running lean. It has enough coolant in it, I've ordered a new thermostat just in case it's that (I doubt it though). My verdict is possibly blocked pumps or rad but just wondering if anyone's got any other ideas? Secondly, when the engine temp light comes on, when I come to a stop the tickover will stick between 2,500 and 3,500 revs for a while until the light goes off, then it will gradually go down and settle at 1,700 which is my idle setting, any ideas about this too?Many thanks Quote
Joeman Posted November 25, 2016 Posted November 25, 2016 dont get seen doing over 30mph on a 50cc bike else you'll be in big trouble...Take the plug out and look at the colour. with two strokes you can tell a lot from the sparkplug colour.my guess would be that its running lean and you have too much air getting in at low revs. Quote
TimR Posted November 25, 2016 Posted November 25, 2016 Generally with two stroke .. it means its not long left for this world .if you ride sensibly does it overheat ? Quick heating could be knackered thermostat ... air blockage . .It maybe able to rev that high but if your ( the user not yourself ) using low grade oil they dont like it ...Especially derestricted its asking for trouble Quote
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