AMG,

I do appreciate the help.

However, I have tuned several other engines (MT12's , Rossi's, etc.) without problem so I have a pretty good idea of what is going on.

Matter of fact, a buddy or mine and I tried for 2 hours one day to get this engine to act right. Without any luck.


Too lean: When I used the suggested needle settings recommeded on this post (HSN: 5.25 and LSN 2.25) here is when it was too lean. I determined it was lean a few different ways. First, the pinch test. When I pinched the fuel line, the engine stopped immediately. Secondly, you could hear the engine revving and then slowing down, revving and slowing down at idle. Thirdly, if I shut it down and tried to start back up, it is a bear and you can hear it starving for fuel. To me, that is a sure sign of a too lean LSN.


The reason I am even posting here is because I have tried all the usual techniques and nothing seems to work. If I get it running to where it will stay running, The temps go off the chart (yes, over 300 degrees). If I riched the needle settings up then it start the flame problems and also runs like crap.

I have been very patient in moving the high and low needles (one hour at a time, which BTW, is very tediuous to do) and have still no had any luck.


this why I thinking it may something more than a tuning issue.



now, you say the crank is ok, but according to the way it is suppose to be (filled crank), there is a much larger volume in that chamber than the design calls for. This could mean more fuel, more air, or a combination of both. This is why I was asking that question.



Sorry to ramble but I cannot for the life of me figure out how to correct my problems.