Craftsman 247.377300 5X65RU motor

[ILENGINE]

You mentioned in your first post that it was a non choke engine, but it acts just like a choke that is not opening. You may have mentioned it or I missed it, but did you check the flywheel key. partially sheared keys will cause the same thing.

 

[bizzs]

Thanks for the reply. The choke is automatic and it is temperature controlled by the heat from the exhaust. I did not check the key because I was thinking that it was too new to sheer. I will pull the flywheel off and check it out. Any other ideas? Could this be electrical since it will not start back up after I shut it down, even with starting fluid?

Thanks
bizzs

 

[bizzs]

I pulled off the flywheel and they key was intact. I removed the key and inspected it finding no cracks or sheared parts. Thoughts?

bizzs

 

[ILENGINE]

In your first post you said it was a non choke, which I was thinking primer. But you said that the choke is thermo controlled by the heat of the muffler, which make it an automatic choke. If I understand correctly. run the engine from cold for a few minutes, and shut off the engine, and remove the air cleaner and make sure the choke is staying open.

If the choke isn't opening slightly after startup and then continue to open it will run just like the youtube video.

 

[bizzs]

The choke does open. I removed the air filter cover from the carb and I have full view of the butterfly. When its cold, it is shut closed. When the motor starts, I observe the butterfly open slowly about a quarter of the way. If I open the butterfly all the way manually, the engine stalls. Take notice on the video on how the mower runs for almost a minute and then the idle rpms increase and then it smooth out. At this point the choke is wide open. When I shut the motor down, it will not start up again until the motor is cool, even if I spray starting fluid inside the carb. Thoughts?

Thanks
bizzs

 

[BlazNT]

Where did you get the valve clearance sizes? Normally they are a range and different for exhaust and intake. You normally set them 1/4 turn past TDC with both valves closed.

 

[bizzs]

I changed the settings since that post. I downloaded a service manual from MDT for a motor that looked like mine. I set the intake to 4 and exhaust to 7. The range was 3 to 5 and 6 to 9. I set them at TDC with a feeler gauge

 

[ILENGINE]

The choke does open. I removed the air filter cover from the carb and I have full view of the butterfly. When its cold, it is shut closed. When the motor starts, I observe the butterfly open slowly about a quarter of the way. If I open the butterfly all the way manually, the engine stalls. Take notice on the video on how the mower runs for almost a minute and then the idle rpms increase and then it smooth out. At this point the choke is wide open. When I shut the motor down, it will not start up again until the motor is cool, even if I spray starting fluid inside the carb. Thoughts?

Thanks
bizzs

My thought is you have a partial flooding situation not a lean run problem. And if it is flooding, spraying starting fluid may just increase the flooding problem.

 

[bizzs]

Thanks for the reply. I am at it again the morning.. Please bear with me for being such a pest. Any guidance you can offer to diagnose a partial flooding problem is appreciated? I have just about every mechanical tool to fix cars and I am determined to find the solution. I am puzzled! I can usually fix mechanical things easily, but this is new and has me obsessed to get her running again.

thanks
bizzs

 

[bizzs]

Well I gave it my best shot today and no luck. I have no clue what is causing this problem. I spoke with the manufacture today and was told that the compression should be between 55 and 85. Mine is over 100. What could be the cause of this? I suspect the high compression or an ignition coil may the culprit to this. Anyone have any thoughts on this?