Posted by The tractor vet on August 04, 2013 at 08:49:08 from (75.19.124.38):
In Reply to: SM Carb Help Please posted by Pete_5959 on August 04, 2013 at 05:55:04:
BEFORE you start turning screws on the carb. you had best start from square one . And make usre that EVERY THING is dead on . First check and make sure that the gov. is working correctly and that the BUSHING on the arms where the Gov. spring are there and that the spring does not FLOP around in big holes as nine out of ten have the bushing missing and you will not FIND them in the parts book . Once the spring is tightened up then ya do the carb to Gov adjustment then ya do a base set like the book says , next step i do is a complete tune up and check the dist. for ware and proper timing advance , once that is correct then lets move on to the valve adjustment and take your time here and watch out for what i call bridgeing where due to ware on the end of the rocker arm where it makes contact to the valve stem as most do not hit dead center on the rocker arm and if your not looking you can and will get a false set as you try and use the whole feeler gauge when you just need to use your feeler gauge off to the side so as not to cause the bridgeing . And you will hear guys say must be set HOT just set the valves to spec.s if everything is warmer then 70degrees as unless your going to WORK the tractor then you will NEVER get it up to OPERATING temp and if you did you sure won't be setting valves with a glowing manifold . So once you have this all done NOW start the tractor and let it warm up for say five to ten min. Open the main jet up to 4 1/2 turns to 5 turns then start to slow the ideal down and work at smoothen it out and keep working the curb ideal screw and the ideal mixture screw down . Just a small tweak at a time . JUST KEEP IN MIND HERE that you are working on and OLD tractor that has had extensive field testing and everything in it is well used. and sometimes you can only do somuch. Now IF you totally rebuilt each and everything then you might get it to be perfect . Cam ware can give you fits dist ware drives ya nuts and a Gov that is wore out is why they make Crown Royal.
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