149 Running terrible after overhaul

[jstouffer]

Any help very much appreciated. Problem starts and idles fairly smooth. Removed balance gears and have overhauled several cub cadets over 50 years. When you give it throttle it bucks and coughs and eventually stalls. Will run at idle fine. Replaced points, condenser, coil, and Plug. Rebuilt carb, replaced fuel filter removed and cleaned fuel tank. Checked wiring all good. No problems with rebuilds in the past. Checked lifter clearance on valves. At a loss only thing I can think of is crankshaft out of time with camshaft. Thought I was to smart to miss timing it right, but i'm at a loss for other ideas. What do you guy's think.

 

[jkoenig]

Could it be a governor problem? With the balance gears removed, it may want to act differently.

 

[jstouffer]

Could it be a governor problem? With the balance gears removed, it may want to act differently.

I installed new governor. That's why i had to rebuild, it had busted.

 

[1811Cub]

Does it act differently with the choke knob pulled out? Might be an issue with the high speed fuel circuit in the carb. If you have another carb, swap it out and see if it acts differently. Also, when it's acting up, any black smoke present? Also try swapping spark plugs.

 

[jstouffer]

Forgot to post I rebuilt it because Governor had busted.

 

[jstouffer]

Carburetor was fine before rebuilding engine but I pulled it apart and cleaned and installed new kit. Has anyone put one together with it out one tooth and will it run?

 

[jkoenig]

New governor. Did you go through the governor adjustment in the manual?

 

[jstouffer]

Yes and have done several in the past all worked well. Anything else you can think of?

 

[jstouffer]

I'm at a loss, have no other ideas.

 

[jkoenig]

You may be right about the timing, but if you’ve done these before, I doubt you would not have checked, and double-checked

 

[jkoenig]

Carb might have had something disturbed with the cleaning, and new parts. 1811’s trade-a-carb seems like a good idea.

 

[abthomas]

I had one like that a couple years ago after a rebuild and it was a bad plug wire !

 

[mgonitzke]

Did you replace the points pushrod?

Also, check the ignition timing again. Gapping the points to 0.020" is not good enough.

 

[jkoenig]

We have:
coil wire, maybe we should add coil
points plunger
points gap
(add points timing)
carburetor

All of the above can be done quicker than removing the engine to check timing again.

Did you measure the valve clearances correctly? I misread one once and it ran great, but was terrible to start...

 

[mjame]

did you remove the crankshaft to get to the governor?

 

[lpalma]

Check the points, points arm may have broke, even if they are new. Some aftermarket points have a longer screw that holds the lead in place and hits the points arm when tightened, I ended up filing down the screw. Is the coil wired correctly? + to ign. - for points and condenser. Coil and condenser need good clean grounds. Fuel shutoff should be a screened filter in tank, with no other filter on the fuel line.

 

[dschwandt]

Static time using Matt's procedure.

http://www.mgonitzke.net/cubcadet.html

 

[jstouffer]

Appreciate all the suggestions will try some of them next week after Christmas and let you all know what I find. I'm in no hurry Just at a loss. And yes I did remove crankshaft.

 

[gary noblit]

James,I'm certain you know how to check timing but you said it runs fine at idle.So the system is working until you ask for more rpm.More rpm means it wants more fuel .What kind of fuel pump do have?or none? If it eventually quits,is it running out of fuel in carb,could be float adj as well? I would concentrate on fuel first...

 

[bwstevens]

The 149 that I have is gravity so checking the screen in the tank is a start and then go farther into the fuel system.