Idling problems for 2 stroke gasser
 

Hi all, Assembling my new qq 102 w/evolution 116 & wanted to hear the engine & break it in. Bad part was the evolution exhaust i got for it would not even come close to fitting in the cannister box. I might be able to get a 60-65mm can in there, the evos were huge, maybe 80-90mm. So i just ran the engiine for a few minutes with no pipes at all. well it wont idle for crap, it seems like its running too rich, cause breaks into a 4 stroke. try leaning, no help, try richening no help. did get it somewhat better by adding fuel over the factory setting. Am I doing wrong running open exhaust & is that causing the crappy idle?

RE: Idling problems for 2 stroke gasser
 

every two stroke seems rich (misses beats) when idling. It is a fact of life and the 116 is no exception to that rule.
This happens up to 1/3 rd trottle. With proper carb tuning it can be eliminated from that point on, but the engine needs to be run in first.

RE: Idling problems for 2 stroke gasser
 

No exhaust system-lets the incoming fuel charge flow out the exhaust with the burnt gasses.
and as noted - low speed performance is ruined
with the cans th engine idles at down to 800 easily
here is a pic of a Paint Spat CAP I did for a friend using th factory cans- I had to slit ,bend and rebraze one header to align them as req'd

RE: Idling problems for 2 stroke gasser
 

Thanks Dick, you did good getting that system in there at all. I would have had to completely rework the plane to get those huge cannisters in there. They are so damn big! I've got a set of 60mm ones coming from DA with a set of MWS headers that DA has. Do you think the engine will idle down to 800 like you said once I get these on there? It really doesn't sound good at all. Once you slow down below a third throttle, It is very hard to keep the engine running. How smooth was yours when you got down with it? Thanks.

RE: Idling problems for 2 stroke gasser
 

Don't aim for lowest rpm yet. The engine needs to run in until smooth. That takes a couple of gallons.
At 1/3rd throttle, open the idle needle until rpm markedly drops. That should be a good start to work your way down.
Remember, to run without exhaust system, the settings you need may be very different from a full rigged setup.