mcman56 Posted July 5 Report Share Posted July 5 My TL250 can be finicky when starting hot, like 90 degrees and low humidity. Are there any tricks or methods that may help? With near full choke and maybe 1/3 throttle it starts very easy cold. Quote Link to comment Share on other sites More sharing options...
konrad Posted July 5 Report Share Posted July 5 So it's difficult to start only when the ambient temperate is high? How does it start when the engine itself is hot? Have you checked the valve clearances? 1 Quote Link to comment Share on other sites More sharing options...
lineaway Posted July 5 Report Share Posted July 5 The TL250 was prone to over heating. Are you running the stock carb? You might go up a size or two on the pilot. 1 Quote Link to comment Share on other sites More sharing options...
stpauls Posted July 6 Report Share Posted July 6 8 hours ago, lineaway said: The TL250 was prone to over heating. Are you running the stock carb? You might go up a size or two on the pilot. Additionally, 1. Check the timing. 2. If a carburettor heat shroud is not fitted then buy or make one. Quote Link to comment Share on other sites More sharing options...
mcman56 Posted July 6 Author Report Share Posted July 6 I have not been able to test with hot engine and cool air temperatures. It is hot engine and high air temps. There is no heat shield. The front muffler (bulge in exhaust) is near the carb and I wonder if wrapping it in heat shield would be the same as a heat shield. It has a Chinese copy of an OEM type 22 mm Keihin carb. I did have to increase the throttle slide cut away to get rid of an off idle stumble. I wonder if I could have gone too far. I have what I believe to be the OEM TL250 slide to copy but no other OEM carb parts. I'll check timing and valve clearance. Quote Link to comment Share on other sites More sharing options...
lemur Posted July 6 Report Share Posted July 6 If it is a non-original carb, how did you set the float level? If the valve clearances are set perfect, I’d be visiting the float level to possibly address the off idle stumble. Carburetors need to be isolated from heat that can boil the fuel and from vibrations that can turn the fuel in the float bowl into froth. Plug read should tell if carb settings are rich or lean, post up a photo of your carb setup and sparkplug after running for a while might help us to assist. Quote Link to comment Share on other sites More sharing options...
konrad Posted July 7 Report Share Posted July 7 Will it restart easily immediately after a hot shutdown? That would be a clue whether heat-soaking is the issue. Is this bike new to you, or is it a new problem? Could be something as simple as using "winter" vapor-pressure gasoline in the summer. Quote Link to comment Share on other sites More sharing options...
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