fuel issue?

[squid929]

I have a thunder tiger ST-1 that I had just run a tank of fuel through, and when I refueled it after a cool down, re primed, it won't idle without the glow starter connected. If I hold the rpm's up a bit it will stay running but then it cuts out if you let it off. Once I got some heat built up and ran it around abit it continued with the idle prob. The first run had the motor temp up to just under 200 Deg F. and it ran fine. Now it seems I can't get full rpm out of it. I get smoke from the pipe, and fuel mist out of it at idle. the motor has had maybe 10 tanks run through it (Morgan 30%/12%) outside temp is around 1 Deg C.
any ideas?

 

[Extreme RC Mods]

Try a new plug, as engines break in there is material removed as the piston laps into the sleeve. Some of this material will bake onto the coil of the plug and make it act erratic as well as make it run hotter. Even if it "looks" good, many times it is not. I would start with that.

 

[chip812]

Plus when the ambient temp drops that low, you need to change the tune... I'm not sure if it needs to go more lean or more rich (Santa is bring me my first Nitro)... There is a post here some where that tells exactly what you need to do...

 

[Extreme RC Mods]

Yes, cold air is more dense requiring a richer setting, alot get confused thinking lean it out to keep it warm and that is bad. You don't need to change your plug according to ambient temp either, the plug only dictates your ignition timing and not the temp of the engine, that comes from your tune.

 

[chip812]

The only reason I mentioned the plug was if you had used one that was too long - thus increasing compression by decreasing the compression space...

 

[Scrogg]

Robin down here in the South when the ambient temps drop, humidity goes way up. We always have to lean all our engines at night time by a full 1/4 or more some times! As soon as the sun drops, the engines all start rich bogging like they are at factory settings. We had a guy recording temps and humidity to verify this. i'm not disagreeing with you, I am just adding in a factor I don't think you see very often. All that nice cool dry Canada air, man I'm jealous when summer rolls around. I loved the summers when I used to go to visit my mom in Alaska. No humidity hardly ever, the record high was like 80-82F one summer. All the locals thought it was hell on Earth! LMAOF I told them to come down to Georgia in July, it's unbearably hot and humid. Alaskans would pass out from heat exhaustion in 5 minutes.

 

[Racer 1966]

Temp under 200,lots of smoke,spitting fuel - Lean it a bit bro. 1C isn't bad for running.

 

[Scrogg]

Temp under 200,lots of smoke,spitting fuel - Lean it a bit bro. 1C isn't bad for running.

Agreed, it's breaking in and it is def. time to replace the plug.

 

[squid929]

Thanks Guys!