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49' M fuel/timing question
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Posted by jamie on June 23, 2004 at 19:45:19 from (24.178.79.172):
Just fixed a problem I've been having with the intake on the sediment bowl getting blocked by replacing the fuel bowl and line with an inline filter. No more problems maintaining good gas flow to the carb but even so, it tried to die on me coming back to the barn after running it for quite a while with no problems. I had pulled back on the throttle and the engine hesitated and tried to die. Normally, it has good throttle response. I set it back to idle and it kept running (got used to that with the fuel blockage before). I verified that there was plenty of fuel and flow to the carb by draining gas out of the carb. I thought it might have been running a little rich so I turned the main adj screw in about a turn. It cranked right up and ran fine to the barn. Since I haven't had time to build a tall enough shed for the tractor, I have to take off the muffler each time I put it in the barn. When I did, I pulled back on the throttle lever again to see how it would react then and I got a little fire out of the manifold initially. Is this because I now have it too lean or is the timing a little late? I didn't notice that before I changed the main setting on the carb. The timing has been set and the coil,spark plugs, wires, points, cap,rotor were all replaced prior to the problem. I know I need to check the valve clearance. Could that be the problem? This may be normal, but one other thing I notice is that when I crank it up I always get a puff of smoke which I assumed was some oil leaking past the rings burning off. Other than that, it runs strong and sounds great. I'm using 10w-40 Delo in it I believe instead of straight 30w. Before I changed the oil, I don't think it smoked at start-up like that. Should I go back with straight 30w? It doesn't burn much oil at all, just a little puff here and there. I haven't checked the compression (low compression gas/dist engine) yet, but I believe its good. The tractor has a rebuilt carb (float needs to be adjusted - noticed a little gas dripping out the carb), a new manifold, and is a 12volt system.
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