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Subject: 2n compression

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William S Phillips    Posted 07-16-2017 at 15:38:04 [URL] [DELETE]        [Reply] [Email]  
  • 2n compression
  • I have a 2n that is troubling me, I have done all the following. new fuel petcock, new carb and steel line, the tractor is converted to 12v and electronic ignition. I took a compression reading and it is 100psi on all 4 cyl. it will fire up every now and then and runs great, let it sit and it will not refire, after cranking fuel will come out the intake till it levels off with the float, also have confirmed good spark, book says 125 psi but i would think 100psi is still enough to draw the fuel up into the intake, I see the carb they put on it is a tsx 241B. any thoughts? Thanks Bill

    Tim Daley(MI)    Posted 07-17-2017 at 15:15:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2n compression
  • A good, methodical, problem solving system to determine the root cause in any situation is the best procedure. Never just start replacing parts with new, you may or may not stumble upon the true root cause by accident and not ever know it, such as a loose wire. So, how did the tractor run before doing all that? Did it run before doing all that? Often times non-starting/non-running issues are addressed by the owner/operator thinking a 12-volt conversion and/or EI will cure all ailments. If this is the case, you have discovered that that wasn't the cure after all, and problems still exist. The Marvel-Schebler TSX-241Buis perfect for your 2N. The original was the M/S TSX-33 but the 241 model superseded that with the mid-8N production year. Fuel should not run out the carb throat -it isn't set right. If I were to venture to guess, I'd say your problem is in the electronics, but get carb fixed first. Plugs may be fouled now too, pull and dry out with electric charcoal lighter and reuse. There is a ton more good info in our HOW-TO's forum -search Electrical/ Wiring Pictograms by JMOR and download a copy. You will see all the CORRECT ways to wire these old N's. Start tracing wires and verify as you go. Do not rely on what color the wires may be now. Chances are the original cloth-covered/color coded wiring harness has been replaced and whatever is on it now has no correlation to the original color coded harness. Trace and mark as you go. Chances are there is a hiccup somewhere in the wiring.

    Tim Daley(MI)

    Rustyal    Posted 07-16-2017 at 20:23:07 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 2n compression
  • Sounds like the carb is flooding.

    Bruce (VA)    Posted 07-16-2017 at 17:52:17 [URL] [DELETE]        [Reply] [Email]  
  • Re: 2n compression
  • You do not have a compression problem.

    You do not have a carb problem.

    You have an operator problem.

    First, replace the plugs. You flooded it, they're fouled & it will be it next to impossible to start. You don't need to toss them; heat the tips for a few seconds w/ a propane torch to burn off the invisible spark-robbing deposits from today's additive filled gasoline........or wash them in lacquer thinner.

    The usual cause of gas dripping out of the carb throat is operator error.

    While each N has its own starting sequence, none of them will start well by just yanking out the choke rod & holding it out for 5 or 10 seconds while the engine cranks. This is a gravity fuel system on a low compression engine; it is easily flooded by too much choke.

    Try this:

    Key on, gas on 2 full turns, clutch in, 3/4 throttle, press the starter button. Let it crank for at least 3 - 4 seconds before you pull the choke rod. Then, don't hold it out for more than 2 or 3 seconds.

    If you find out it will not start w/o excessive choking, you have problems.

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