OT MF3165 carbutetor

Frank BC

Member
I normally work on the old Ford tractors, but I purchased this tractor a while ago and am having some difficulty getting it running properly. I can get it to start and idle fine, but I can only get it to rev up by working the throttle very slowly, if I go up normally it hesitates and spits terribly. I have done all of the regularly suggested checks, 2 new sets of points and condenser, checked timing and advance, checked distributor shaft for wobble, checked for vacuum leaks around manifold and carb flanges, checked spark and plugs, checked fuel flow out of carb., pulled and cleaned the carb. numerous times, numerous adjustment to main fuel jet. This tractor has a MS carb. on it with the main jet coming in at an angle from the bottom. Does anyone have any comments on the rebuilt carbs. from this site or the new Zenith carbs. also from this site. One of the fellows on the Massey site recommended that going to electronic ignition would likely solve my problem, any thoughts.
 
Frank,Try feathering the choke while opening the throttle up,and see if that helps it rev up without hesitating and spitting.
 
Thanks for the reply. What would be the probable cause of the hesitation if feathering the choke would correct the issue. The problem somewhat goes away as the engine warms up but it is still quite an issue.
 
Frank........starts and idles normally but won't take throttle? First thing I'd due is crack the gas cap to relieve the VACUUM. Simple, eh? Keep yer itchy-twitchy fingers off'n them handy-dandy carbie tweek'ems. Iff'n you done tweeked'em, fess-up and we'll give you instructions to adjust'em rite. 2nd thought, carb leaks? spray all around with WD-40. Iff'n idle changes, guess what??? found yer leak. ........Dell, yer self-appointed sparkie-meister
 
Thanks for the reply. The problem still exists when I work the bracket on the carb. to try and increase the rpms, so I didn't think it was governor related. Is that correct, or should I be looking there.
 
Also check to make sure you are using the right plug and it is properly gapped. I only use "autolite" plugs on my oldies. Also make sure you are getting a nice fat blue spark from the coil.
 
Thanks for the reply Dell. I have played around with both the idle jet and main jet quite a bit, unsuccessfully, to try and correct the problem. I have left the idle jet at one turn out, can this jet have anything to do with my problem ? I have tried the main jet at many different spots, I have cranked it in till the engine starts to die and than slowly cranked it out in short intervals to try and get it to rev up properly, again unsuccessfully. As far as air leaks are concerned, I had the flange face on the manifold resurfaced as it was in poor shape, didn't help. I sprayed propane around the manifold and carburator area, and that didn't help. I also removed the gas cap and that didn't help , I have decent flow through the carb. drain when I remove the bottom plug. I'm still thinking it is a carb. issue , but I am not sure what to do next.
 
Thanks for the reply. I have pulled the plugs a couple of times and they look good. I have a nice blue spark jumping a quarter of an inch at the coil wire and spark plug wires. Pulling the spark plug wires when it is running, there is a noticeable change in engine speed so I think they are ok, but maybe I should replace the wires and plugs.
 
Thanks for the reply. The float level is pretty close to one quarter inch, I didn't measure it exactly, but it is close.
 
[b:d2f3e4a2f5][i:d2f3e4a2f5]
Frank;
In your answer to Dell,....you say/ask......
" I have played around with both the idle jet and main jet quite a bit, unsuccessfully, to try and correct the problem. I have left the idle jet at one turn out, can this jet have anything to do with my problem ?"
MY answer to that is.........OH YEH, that is the idle air adjusting needle, and until you get that, 'Air to fuel mix', correct, the carb cannot do it's job right!!!!
1....make sure all the sparkplug wires are correct, from the sparkplugs to the distrib, in timing order>
2......turn the bottom main power needle 1 1/2 turns out.
3....turn the idle air adj. screw out 1 turn.
Start the engine, and let it warm up to running temp, at idle.

4.....now you SET the air to fuel mix,
Turn that needle in 1/16 turn at a time, or until the engine, starts to idle faster...(higher RPM's)...waiting a little time between turns, so the engine can catch up to the air/fuel mix.

If no results......start from 1 turn out, on the idle air needle, and reverse the sequince....( turning that needle OUT, instead of in.

Hope this works for ya......you should see a dif. as you are adjusting!!!
Leave the main fuel/power needle where it was at start of adjusting.

MS Carb whisperer
Gary[/i:d2f3e4a2f5][/b:d2f3e4a2f5]
 
Frank.........sorry, little late answering yer request fer carbie adjustment. Heres what usually works fer me. Set yer slanted MAINJET to 2-turns and LEAVITT!!! Adjust the side-pointing IDLEMIX fer FASTEST idle NOT SMOOTHEST idle. Understand the difference??? Usually that will be 1/8-1/4 turn. The side-pointing idlemix is BASSACKWARDS, out fer lean, IN fer ENRICHMENT. Adjust the behind the carb idle SPEED fer SLOW 400-500rpms. (ennythang under 500 is good) You may haffta adjust the idlemix/speed several times to gitter to take yer throttle lever command without stalling. .......HTH, Dell
 
Thanks for the reply. I think I should be able to disconnect the governor, so I can confirm one way or the other whether it is causing the problem.
 
Are you sure there is a venture in that carb?????????????? I had one that acted like that & someone before me left the venture out,
 

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