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Greetings, I have a Husky riding mower with a Briggs 24 HP that won't run on both cylinders. When i first discovered this, I had 65lb compression on #2 cylinder and 145 on #1 cylinder. Teardown revealed bad rings on #2 piston. I oversized it .020 and did the rebuild. Now I have the same problem. I have a new carb on it but I'm suspect about it as it's the last link in the chain. Spark is very good. Compression is the same on both cylinders. Any help would be most appreciated.

If you got good compression and fire , that leaves only fuel as the problem, Timing is not an issue since it runs on one cylinder so concentrate on fuel delivery.

Bertrrr said:

If you got good compression and fire , that leaves only fuel as the problem, Timing is not an issue since it runs on one cylinder so concentrate on fuel delivery.

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I agree with Bertrrr on this one. Do you have a double barrel Nikki carburetor on this engine? Has two different fuel circuits for each cylinder. I have had more than one that would only run on one cylinder as a result. Check the carburetor and make sure you have good strong fuel flow to the carburetor.

Thanks for the reply's. I just received my second carb. will try it today. Also as a side note, I had to replace the cam as a lifter was not turning. Had a nice grove in the face. Cam lobe showed wear too.

Do you still have bad compression on cyl 2? If so, have you checked the valve clearances? When you did the rebuild, did you use a new head gasket?

Thank you for your reply. Piston rings bad on #2 piston. Oversized to .020. Yes to all other. #2 compression Was 65 lbs. Now about 92 lbs before break in.

Give a quick shot of starting fluid into the air intake. If it won't at least fire one time you have narrowed it down to plug, ignition, or carb.

If it fires, you have narrowed it down to the carb.

Well, the new carb solved the problem. Thanks for all the suggestions. NOW, does anyone know the max RPM for this engine? 44R877 0001G1..It has sleeve bearings. I'm clueless with a pressured oil system. Thanks Shirley

Doesn't pretty much everything get set to 3600 RPMs?

GearHead36 said:

Doesn't pretty much everything get set to 3600 RPMs?

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He used to be the case or at least that's what they rated them at and often spec'd them to run but most machines now have been coming lower than that for a couple of decades.
3100 to 3200 is very common and hardly anything goes over 3400.
There are a few commercial applications where they actually state to run them at 3600 or maybe even slightly above that but that is not that common.

TobyU said:

He used to be the case or at least that's what they rated them at and often spec'd them to run but most machines now have been coming lower than that for a couple of decades.
3100 to 3200 is very common and hardly anything goes over 3400.
There are a few commercial applications where they actually state to run them at 3600 or maybe even slightly above that but that is not that common.

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OK. I didn't know that. The shop manual for the engine on my commercial ZTR (engine DOM 2016) specifies 3600, so I thought that was still the norm. Thanks.

To know what to set the RPMs at post the model and type of the engine and someone can look it up.

GearHead36 said:

OK. I didn't know that. The shop manual for the engine on my commercial ZTR (engine DOM 2016) specifies 3600, so I thought that was still the norm. Thanks.

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As I mentioned in the post, some commercial mowers did set to 3600 and I've seen some models spec for 3650 or 3700 etc.

Thank you, I set mine to 3100 mainly because it has sleeve bearings. 24hp is a lot of power to cut grass and weeds. I had weeds to 18 - 20" and the mower laughed at them. Thanks for all your help. Shirley