49 cub wants to die under load

[Rcook09]

hello everyone sorry I haven’t been here in awhile life was been pretty busy lately, for those of you that remember me know that my tractor caught fire and I was in the process of rebuilding it. I got old Smokey back together and running fairly good for now my problem right now is that she wants to die on me when under a load,I’ve got it alittle better than it was by tinkering with a couple of things but she still has the same issue, for example I really have to ride out the clutch in 3rd gear or it will sputter and pop and def wants to shut off. 1st is fine 2nd it does it but not near as bad. In first it when I hold the break to try and get it under load it will sputter some of the time, is this a fuel issue? Is my float not set right?

[Crimson Tim]

Could certainly be a fuel issue.
When it is having trouble, does applying some choke help? If choke helps, it is likely starving for fuel.
Very common issue. Probably some bit of debris in the fuel line or carb jet. Do you have any rust or any other debris in the gas tank?
Clean the carb jet, carb inlet screen and fuel bowl screen. If that helps, but only for a few minutes, you’ve got more debris and will have to go through the entire fuel line from tank to carb to get it clear.

Could be an air issue.
The air cleaner is an easy check. Just pull the hose from the air cleaner off the front of the carb for a minute to see if things improve. Air cleaner could be gunked up. Easy to clean.

Could be float setting. Check float level and drop per manual.

Could be governor linkage. Is there any slop or binding anywhere in the linkages from throttle lever to governor or from governor to carb? The linkage could just need adjustment, too. The procedure for that is in the manual as well.

Could be other things, too, but these are the first and easiest I would check.

[Rcook09]

I am getting lots of “ash” I guess you would call it in the sediment bowl I keep dumping it out, my carb has no screen in the inlet, I’ve pulled the jet many times. Would an in-line fuel filter be the answer with so much ash in the tank? Till it all eventually comes out? Governor linkage seems normal, it could very well be the float I’ve messed with the “drop” but not the actual float setting. Using minimal choke helps but not 100% better. Just need it to disk the garden Wednesday thts y I’m in such a pinch. Thank you for your imput I’m going to try the float but I don’t have any way to measure /32 of an inch

[Waif]

I need the r.p.m.' s up pretty high( compared to first and second) to let the clutch out in third without stalling.
Second needs greater r.p.m.' s than first gear does too.

[Glen]

Hi,
I would check the ignition timing, it has to be right so the engine will have power. It can be wrong some, and still the engine will run good when sitting.
The ignition points have to be good, and have flat shiny surfaces.

[Bob McCarty]

but I don’t have any way to measure /32 of an inch

If you have calipers, use 1.4" for the float height, and 1.6" for the float drop.

[Rcook09]

I do no have calipers. Maybe thts something I should get. I did notice on my points that the clearance is different on each side of the shaft, it is a mag it’s not much different but the points are new couldhaving a slightly different clearance on each side of the shaft cause this?

[Rcook09]

Scratch tht we have one here at work I’m going to borrow

[staninlowerAL]

Have you checked the valve lash adjustment?

[Urbish]

My '48 Cub would die under load when I first got it. I performed a static timing adjustment and have never had another issue.

[Rcook09]

I have adjusted the valve clearens I think it was .013? Whatever the manual says. I’m going to hook the timing light up and try it

[Urbish]

If you have magneto ignition, just follow this static timing procedure (video is about 5 minutes longer than it needs to be):

[Rcook09]

Timing light shows tht it is slightly out but not much

[Rcook09]

Ok when static timed like the video my timing light shows tht the pointer is about 1/4 inch below the 16* mark on the pulley? Y is this? Am I missing something? Please help

[Glen]

Hi,
Below is a page from the Cub service manual, showing the timing marks. Earlier Cubs only had 1 timing mark on the pulley, the TDC mark. Maybe you have the info already.
They are talking about something else on the page.

http://www.farmallcub.info/manuals/gss- ... 001-43.jpg

The guys on here have said before that the magneto should run at about 13 degrees before TDC, with the engine running.
The impulse coupling should keep the timing at TDC when the starter is cranking the engine, and you hear the clicking sound.
If the timing is too advanced, it can make it sputter and fire through the intake, or carburetor.