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I finally got the two pulleys, the engine and blade brake pulleys, and installed them. This was for the second identical mower, with the same problem, not the original mower, for which this post originated. Ran the mower for 40 minutes, with the blades unengaged, and not a peep. The blades...

That's worth checking Both mowers are the same vintage.

Well, my neighbour up the street called me with the same problem. Same model mower. Here are his pics. The belt is very loose and not rubbing on the pulleys at rest

I will get back to this mower soon and check out your tips. The engagement cable has no tension whatsoever. The brake block is fully against the drive pulley and the cable has slack. Theoretically, the motor should run and the only contact with the belt would be with the motor pulley...

This is a 30" walk behind. 20200 Initially I thought the arbor was bad because there was slight side to side shaft play. Thinking along the lines of sgkent, I thought it could be bad bearings. Changing the spindle assy didn't do anything. As I was looking this over tonight, the engine pulley...

I was disgusted with it so I parked it in the shed for about 2 months. The belts are gone. The belt in the pics is the final belt that chirped. You can see no wear on the side that touches the idler. The wear from about 45 seconds of running is on both inside edges. The belt is genuine...

I double checked my mower to concur with your suggestions. The motor sheeve has a guard but it's one that the belt easily slips under and goes around the sleeve. The idler pulley pushes against the outside of the belt, activated by a cable. The belt itself goes loosely around both sheeves...

Toro model 20200, serial number 315000XXX. Mower ran for years without any mowing issues. Then one day, the belt that connects the motor drive shaft with the smaller pulley of the deck drive, shredded. See pic of that pulley. Installed a new OEM belt and started the motor. The belt...

Toro model 20200, serial number 315000XXX. Mower ran for years without any mowing issues. Then one day, the belt that connects the motor drive shaft with the smaller pulley of the deck drive, shredded. See pic of that pulley. Installed a new OEM belt and started the motor. The belt...

Toro model 20200, serial number 315000XXX. Mower ran for years without any mowing issues. Then one day, the belt that connects the motor drive shaft with the smaller pulley of the deck drive, shredded. See pic of that pulley. Installed a new OEM belt and started the motor. The belt...

I guess I could try. If I understand, the old style mods needed 12V to fire. Is that what the second male terminal beside the ground terminal was for? 12V. ? In 20 years, I've never seen a good coil NOT fire on every revolution, with the ground wire disconnected.

Thanks for the help. I am convinced my motor was converted in the past. I looked at the pics for the Cub website suggested coil 24 584 36s and it doesn't look like the 25 584 15. The major difference is that the 25 584 15 has a braided sleeve around the high tension wire and only one male...

Working on a Cub Tank M60-KH, model 53BB5BDX750, ser. 0C295Z80032, 2005 model. Cub Cadet and other websites that sell parts for the engine, call this engine a CV740S-0015. Unfortunately, the spec sticker on the motor is gone. Cub claims the motor on this model tank is a CV740S. That's all I...

Installed the new cam. The piston is not at TDC, it's position is still like the picture showed. Ran for half hour test. Thanks all. I'm glad it's running well again.

Regarding the ipl above, there is no spring shown; but the service manual shows one. Anybody have a part number on this ?

On the Briggs website it states that if the timing marks line up, it's not important where the piston is. It will not usually be at TDC. News to me. Anyway, the crank gear and key are good and carb and cam on order.

I just saw that too. When it rains.....

Hold on here. If the piston isn't at TDC then the pinion gear must have slipped on the crank.

793880 is the cam that Briggs sells. Is there an upgrade or is this the only one? And will it hold up?

Original engine. Never opened up. The marks aligned each revolution but the piston wasn't at TDC. I wonder how it happened

Here are the pics. Look at the timing marks, then see the piston position. How did that happen? Then see the cam. The word "cam" was mentioned enough and that was correct. Thanks to all that opined.

I think I found it. Should have done this sooner. The intake valve rocker moves the valve stem inward 7/16" in a cycle while the exhaust valve only moves 1/8". Cam lobe?

See

Slomo, not sure what you mean about the shut off valve but I do have a remote tank hooked up to bypass the fuel pump and it has a shut off. But even if the carb was rich I would expect to see black smoke but would I expect to see mist and feel pressure coming back through the carb inlet?

Question. I don't know if this engine has a plastic cam but if it did, would the valve clearances at TDC always be correct like they are?

The float does seal off the fuel parallel to the body. The rest of the upward movement is from the spring. Not sure about the plastic cam. I noticed the starter ring on the flywheel was plastic

Thank you. My jet o ring is flattened. Probably could use all the gaskets. Update...the motor is running full speed with no smoke now. However, it backfires frequently through the carb and fuel mist is visible and felt. I can fix the carb but is is possible that a burned or badly seated...

I can do that but what about the blowback thru the carb? I guess an mp4 isnt allowed to be uploaded, I tried, but do you think a bad carb would allow gas and air to be expelled out of the mouth of the carb when running?

Pulled the valve cover again. Valve lash good at TDC. Manually turning the flywheel, it definitely pushes out air that I can feel on my hand as it approaches tdc and up to tdc

Thank you. I will check again. I hooked up a remote fuel tank and ran without the pump. The fuel and compression are visibly pushing out of the carb mouth. If I hold my hand there, it gets wet from gas mist. This time I pulled the flywheel and physically checked the key.....no damage to the...

Briggs Model 31Q677 0117 B1 091007ZD Nikki carb. 795373. G02809. 9817 1B Problem started recently and got worse. Would not run above half throttle and now doesn't run at idle. When it was running, and above half throttle, it would backfire and puff black smoke. The spark plug was carboned up...