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Discussion Starter · #1 ·
I have a 10591 Lawnboy M series with the Fresh Lube oil injection. It needs a check valave, and I plan on using this mower regularly, so I was just going to disable the Fresh Lube and run it on premix. For some reason, I would feel better running it on premix knowing it's getting the right lubrication. I've heard of guys taking the pump and all off, but couldn't I just empty the oil tank out and disconnect the oil level sensor? Thanks for any help.
 

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Lifetime Lawn Guy
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Yes, that should suffice.

On my 10590 I wanted to leave everything there, incase in the future I ever wanted to convert it back to oil injection... I pulled the flywheel and the 2 bolts that hold the oil pump down. I had to pull the oil line loose from the tank and the carb plate to get enough slack so that I could get the pump off of the crankshaft (without messing with the linkage) and removed the black plastic gear from the crankshaft. I then reassembled everything and reconnected the line to the carb plate. I put a commercial tank on mine so I put a nail in the hose as a plug and zip tied it up.

I thought it would be best if the pump didn't run dry. Since mine is all brand new, no sense in possibly ruining it.
 

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Discussion Starter · #3 ·
Yes, that should suffice.

On my 10590 I wanted to leave everything there, incase in the future I ever wanted to convert it back to oil injection... I pulled the flywheel and the 2 bolts that hold the oil pump down. I had to pull the oil line loose from the tank and the carb plate to get enough slack so that I could get the pump off of the crankshaft (without messing with the linkage) and removed the black plastic gear from the crankshaft. I then reassembled everything and reconnected the line to the carb plate. I put a commercial tank on mine so I put a nail in the hose as a plug and zip tied it up.

I thought it would be best if the pump didn't run dry. Since mine is all brand new, no sense in possibly ruining it.
Thanks for the help. I think I'll do what you have done here. I wouldn't want to ruin the pump either. The only time I might re-enable the oil injection would be if I decide to sell the mower and after I get the check valve.

Thanks again.
 

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I have always wondered about the fresh lube system. Do they work well on the lawnboys? my uncle said he had an old snowmobile that had 2 cycle oil injection but he burned up 2 motors. when he started using premix on the 3rd motor, he never had a problem. Was just wondering if i see one to pick up, should i disable or use the freshlube?
 

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Lifetime Lawn Guy
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I have always wondered about the fresh lube system. Do they work well on the lawnboys? my uncle said he had an old snowmobile that had 2 cycle oil injection but he burned up 2 motors. when he started using premix on the 3rd motor, he never had a problem. Was just wondering if i see one to pick up, should i disable or use the freshlube?
I've heard that a lot as well, anyone who knew 2 strokes back in the day when they were on atv's and dirt bikes with oil injection always ran pre-mix with no oil in the tanks. They just didn't trust them to be 100% accurite all the time. A little heavy on the oil and you get heat and smoke, a little lean and you get more heat and lack of lubrication, if it fails totally you get a boat anchor.

I've honestly never heard of them failing on the lawn boys though. A lot of the paranoia about oil injection may have been unfounded, but loosing 2 snowmobile engines to lack of oil would make me scared of it as well...
 

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Lawn-Boys and VW's
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I have oil injection on my Kawasaki snowmobile. Its a 1979 and I have not had any problem with the oil injection system on it. I really can't disable it cause on this engine it actually has lines to the main bearings to lube them from the pump from what the shop maunal says. I have not heard any engines failing from the pump. Who knows though. I would not want to burn an engine out either though.
 

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Maybe my uncles was cheaper brand snowmobile, who knows. some equipment just has their own quirks that you have to work through.
 

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No problems that I've heard either on M's injection. I've read as much as I could dig up on the net and asked some long time LB dealers in my area. I'm running my systems, but neither get used very often. About the only thing that can fail would be the nylon crank gear that drives the pump gear which is steel. I recommend pulling the flywheel and pump cover to PM it with a dab of grease. Back to the sleds, Shawn, I do know that the kawi's were prone to crank seal leaks which turned into burn downs from running lean, quite often with these older engines. A friend had one about 10 years ago that I swapped engines out with due to this. I believe it was the mag side seal of the crank.
 

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Lawn-Boys and VW's
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Yea, they were. When I got this one 7 years ago I went through and changed the crank seals and gaskets. The head was leaking coolant on #2 cylinder externally, so I pulled the engine apart. Minor tune on the carbs and this thing runs great. Interesting that the mains have an oil feed to them from the pump. So an injection point at each carb and each main bearing.
 

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When I got my first M series I was very paranoid about the oil injection system. I was always looking for air bubbles in the oil line and worrying. After reading everyone's experiences over the years, it turns out that almost no one has had an oil injection related failure. Rest easy.
 

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2 stroke enthusiast
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Exactly O.D.F. I've yet to hear of a failure. As much as I would get bent over losing an engine on one of my M's due to this, I check the lines before I start them from a nap. I did have problems after replacing lines on my 10591 to quit seeping, but after a few different attempts at clamping the ends, I finely got it under control. I used small gauge stainless tie wire. The original clamps just wouldn't reclamp tight enough, and I do believe the oil I use had something to do with it also. It's very fluid, more so than regular oils I've used in the past. Did we or anyone ever conclude that OMC infact designed and built this engine or was it another manufacturer?
 
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