Does anyone have the compression specs for the MSU 700 engine? Mine is smoking something terrible at times and I would like to do a compression test prior to tearing it down.
Also will too much oil cause it to smoke? To improve the wet shoe clutch wear, a dealer/parts supplier suggested that I raise the oil level to the bottom on the dip stick threads, which is approximately 3/4 of a quart.
A little background this is a 2016 (I purchased it new in April of 2016) MSU 700 (Tractor Supply version) it now has approximately 500 hrs and 2900 miles on it. I use it almost daily on the farm and also take it to the VA and VW mountains to trail ride. I thought the belt was slipping, well I know it was slipping, so I replaced the belt and changed the oil, but new tires on it, greased, etc... When I finished it smoked like a freight train and I realized that the clutch was slipping also. Oh, I've used Mobile 1 V-Twin Motorcycle (supposed to be for wet clutches but not MA or MA-2 approved) oil in it since the first oil change. I replaced the wet clutch and switched to a synthetic motorcycle oil that is MA-2 approved. No more belt or clutch slipping but it still smoked heavily. Yesterday I ran it at the Rev limit in low and it stopped smoking. I checked the oil, added a little to bring the level back up to the dip stick threads. It started smoking again until I ran it at the Rev Limit for a few minutes then it stopped smoking.
Hello all. I'm new to the forum and have read all the posts I could find concerning the 550 Mule, so far no one with my problem. So, I'll give it a go and hopefully get an answer.
I got this mule about three years ago, had to do some minor repairs, and it's been a great machine. Last fall, I noticed an oil leak coming from the left side around the crankcase cover. I was able to slow the leak considerably, but it still leaked. I never had the time to tear it down due to work. I retire in March of this year and decided to fix it with a new cover gasket. I ordered a new gasket and crankshaft seal and while waiting for them to arrive, I began the tear down and cleaning of the mating surfaces. Got the seal and gasket installed and the cover back on and torqued. Decided to crank it up and let it idle a bit to check for any oil leaks before I put the converters back on. Fired right up, let it idle for about 10 minutes, no leaks. I'm happy at this point...
Next day, installed the inside converter cover, new belt and converters, not the outside cover though. I wanted to see how the new belt was going to work out. I still had the rear end jacked up so it wouldn't move. Guess what, it wouldn't start up. Cranked over like always, just wouldn't start... Now I'm bummed. So I start checking gas, spark and everything is good. Even tried a squirt of starting fluid, and it did fire a couple of times but no start. Now I'm even more bummed. Time for a break.
Now I've worked on everything from small engines to tractors and have never had this problem. After a little thought I decided to run a compression test. The repair manual lists 115 - 178 psi as the correct range, I had 30 psi!!!!! What in the world happened over night. I did spray a light oil into the cylinder and it came up to about 60 psi but that was all I could get. I checked the valve clearances, their good.
Sorry for the long post, but I hope someone can point me in the right direction cause I really like this little machine.
Thanks for your help,
Hi I am new to the forum. I have a small kids utv with a 125 4 stroke motor. It sat for over a year and I decided to get it running again. Put a new carburetor on it and it ran better than ever. Change oil and fixed the brakes kids probably drove it for a few weeks maybe 3 to 4 hour maybe. Went to put it away after it sat for maybe an hour wouldn't start. Just turns over no spitting or sputtering. Checked compression has 150 psi, getting spark, changed spark plug old one was pretty black. Put new cdi on and coil still nothing. Any ideas would be appreciated thanks.
I pulled the valve covers off the mule to adjust the valves. They have been tapping loudly. The two exhaust were correct but the 2 intakes were around .023. But the question is this As I was adjusting I found I could easy open the valve by lightly pressing. Should they should be stiffer than that?