QuestionHey Marc, thanks for the info on my snowblower. However, I was wondering if you could answer a few more questions for me...
The carb was just cleaned and rebuilt last year, so I'm fairly certain that cleaning isn't the issue, I just think they didn't set the ports properly, and I have virtually no documentation on this carb/engine.
1) Any idea what the spark plug gap should be? Or, for that matter, what plug should be in there? The old one had NO identifying numbers left on it, so the guy at the shop recommended a Champion RJ19LM. Without any gap info, I just went with the default gap, which matched the gap on the old plug, assuming that was correct.
2) The carb has 3 adjustable screws on it. One at the bottom of the float, in a vertical direction. There are also two more on the side of the carb, one large just like the bottom one and sits horizontally just above the bowl, and one smaller horizontal one, towards the top of the carb.
3) Which one does the air fuel mixture, the one on the bottom of the carb? What are the other ones, idle sets?
Could you please help me understand what screw might do what, and what is the effect of turning in or backing out each of them?
Also, playing with them, as you suggested (I assumed you ment the one on the bottom of the bowl), I got it running pretty decent last night, but I think the other two sets may be messed up too. What would happen is it would kill very suddenly, usually under load. Usually, a snow blower will start killing due to load, and you can simply release the auger or pull the unit out of the snow pile to keep it running, but this unit is killing SO FAST that you don't even have time to realize that it is 'bogging down'. Any thoughts?
Once again, I really appreciate your help!
Kurt Sholly
262 884 3673
Wisconsin
AnswerIt only takes one season with fuel sitting in the carb to plug the small orifices within it...don't fool yourself into believing it accumulates over a great length of time.
1) If I remember correctly, an RJ19LM will work fine. Set the gap at 0.030".
2) The mixture screw on the float bowl is the high speed adjustment. The smaller one on the side of the carb body is the low speed adjustment. The larger screw on top that engages the throttle shaft is the idle speed screw. The high speed should be set as I described. The low speed should be set at 1 1/2 turns out from lightly seated. When properly adjusted, it should idle smoothly and the engine should rev up quickly from an idle. The idle speed screw should be set to give a nice idle (around 800 RPM)
3) Turning the mixture screws CCW richens the mixture (allows more fuel to pass)
Hope this helps.
