mf-35 no power

[Keith3]

My 63 mf-35 cont. gas has no power. It starts and idles good but when giving throttle the rpm stays the same and blows black smoke. Fuel flow is good,no throttle binding. Should try a tune up or is there something else to check.

 

[garvas]

I would suspect a clogged jet in the carb. Might take the carb off and do a cleaing or even a rebuild.

 

[Keith3]

I should have added that I had the carb off and cleaned. It was pretty dirty but I cleaned it and nothing changed. Thanks for the reply

 

[El Toro]

Have you look in the air cleaner for ice? Hal

 

[Keith3]

That was a possibility a week ago, but it has been in the 50's here. I'll check for obtructions on the intake. thanks

 

[El Toro]

Someone on the Farmall forum found that problem.
It would only idle until he removed the ice. Hal
PS; There may be an obstruction in the air intake causing over choking.

 

[Anonymous-0]

You could try cleaning the points. Dave

 

[Jerry/MT]

Black smoke is an indication that your mixture is too rich. If you pull a plug and your carb is too rich, you"ll see a sooty fluffy dry deposit on the plugs. if so clean all your plugs and check the spark. Pull the center wire off the distributor, hold it near a good ground turn on the ignition and try an start. You should have a FAT, BLUISH- WHITE SPARK. If you don"t then check the primary ignition circuit, the points for correct gap and for corrosion or burning. Make sure the connections are all bright and tight.This is particularly important on a 6V system because they are marginal at best. Check the initial timing and make sure the advance mechanism is working. You"ll need a timing light for this.

If the spark"s FAT AND BLUISH-WHITE, and the timing is correct and advance is working, then adjust the carb.
To adjust the carb, turn the main jet in completely, but don"t reef it down. Then turn it out 1-1/2 turns. Start up, bring it to operating temperature then accelerate from idle to max rpm. The engine should accelerate smoothly without hesitation. If it doesn"t enrich it by 1/8 turn increments> If it doesn"t improve, then go back to 1-1/2 turns and lean it by 1/8 turn and see if it improves the accel. if it doesn"t you may ahve a bad float valve or float setting or the wrong carb jet, damaged adjusting screw, etc.

 

[Keith3]

Thanks Jerry, I'll give those a try and get back to let you know what I found.

 

[Keith3]

I checked the spark and everything was good, it seems that the mice found the filter intake was the perfect place to build a nest. I cleaned everything and the tractor is back to life. I now know what happens without proper fuel air mix. Thanks to everyone for your input, this is a great resource for diy. Keith

 

[Jerry/MT]

Thanks for reporting back on what you found, Keith.