Re: super m carb serial number

Posted by ChadS on June 13, 2005 at 09:01:22 from (66.228.96.144):

In Reply to: Re: super m carb serial number posted by farmall on June 12, 2005 at 13:21:45:

OK hold on. I was thinking this was a 264, not the 306. Look at the venturi, there is a number on the bottom side towards the bowl. This 2 digit number is what size the venturi is. example, 23/32. I've seen MTA's with up to a #27 venturi, which is just a shade smaller than the 450 venturi of 29. If you have a real small venturi number, like 25 or less, you need to put in a bigger sized venturi. See, what happens on bigger cubed engines trying to run on the stock venturi, with the stock jet size, it will run leaner, and you can back the adjustment all the way out, and not see any change. So, a jet change,, now it runs richer,, quite richer cause you have increase the fuel, thats due to the limited airflow. Open the venturi up, and let more air in the manifold, and that should give you back some of the adjustment on the load screw. More cubes,, needs more fuel, and a bit more air. Your feeding 306 cubes, at a higher compression ratio VS stock,, not much more, but its still a bigger displacement to feed. Now on the brass main jet, its a brass insert, that has alot of different sizes in the ID. the OD of the insert are all the same in all Shebler carbs on SH-up to the 6 cyl engines. I dont know if that is a replaceable part sold by parts dealers. Did you drill out the entire brass insert, or did you just enlarge the actual jet size? If its just the jet size you enlarged 2 sizes, then continue and find a larger venturi. Find one out of IH combine, that had a gas 6 cyl engine. a 33 is a good one to look for, there are yet bigger ones out there, but I dont think you will need much over 33 venturi size. If you drilled out the entire brass insert, you need the other bowl. No the M bowl is not the same as the SM bowls. The choke lever is on the other side on the SM, and the jet size is bigger than the M, but not bigger than your MTA. Other than that, they are interchangable with the throttle body. Governor springs make a difference that can be noticed in the seat. They usually have to rejet the carb to keep up with the governor. Alot of problems arrise when people buy aftermarket engine kits for the old Farmalls. Tempers flare, cause something is not just right, and it wont run the way they thought the $$ they spent on it should. A majority of they people that do spend hard earned $$ to do this, spend even more, and not like what they get back. Each engine has its own characteristics. Not just one size fits all. If its right, and you dont have to spend even more $$ on it, and you do it yourself, it makes ya proud that you did it, and you know a little more about your tractor. If you did drill out the entire brass jet, its not junk, it can be saved. Hope this helps a bit more. ChadS

Follow Ups:

• Re: super m carb serial number farmall 22:25:50 06/13/05 (2)
  • Re: super m carb serial number ChadS 08:08:13 06/14/05 (0)
  • Re: super m carb serial number farmall 22:58:17 06/13/05 (0)

Post a Followup Name: E-Mail: Subject: Comments: Optional Link URL: Link Title: Optional Image URL: Email Notification: If you check this box, email will be sent to you whenever someone replies to this message. Your email address must be entered above to receive notification. This notification will be cancelled automatically after 2 weeks.

TRACTOR PARTS	TRACTOR MANUALS

We sell tractor parts!  We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]