Re: Tractor only starts with zero throttle ... any ideas why ?

Posted by Gene Davis on October 07, 2002 at 21:10:42 from (66.82.9.13):

In Reply to: Tractor only starts with zero throttle ... any ideas why ? posted by Alberta Mike on October 06, 2002 at 19:53:28:

Sounds like you are not drawing a very good vacum. Hook up a vacum gauge to the intake manifold and look at it,high eeven vacum reading will make it draw fuel/air mix to crank. I worked for JD in '50s&60's and when the compression got low on their engines, they would always crank better with the throttle closed, because it caused the engine to draw the most fuel/air charge in the cylinders. Also is the choke butterfly operating correctly(seating in the housing) to cause it to pass less air and to pull more fuel from the carb bowl? Is the bowl vent open to allow atmospheric pressure to cause the fuel to flow to the air stream going through the carb? Would bet on low ring sealing quality and the fact that the cylinder head squish chamber is smaller probably did not really raise the compression, probably just caused more blowby of the compression. If it is not sealed to the top side of the piston, you can raise the compression out of sight, and will only make more of it go int the crankcase. The compression needs to be pretty near equal on all 4 cylinders to run smoothly. Maybe it is too cold up in Canada for it!!! Gene

Follow Ups:

• Re: Re: Tractor only starts with zero throttle ... any ideas why ? Alberta Mike 08:07:03 10/08/02 (1)
  • Re: Re: Re: Tractor only starts with zero throttle ... any ideas why ? Al 16:44:56 10/12/02 (0)

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