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FS91 strokin

#1

PTmowerMech

PTmowerMech

It's only a few months old and not sure about the carb adjustment. If it was a regular 2 cycle, I'd adjust the carb. At 3/4 to WOT, it's strokin hard. But it being a 4 mix, the dealer says that's normal. Only he doesn't understand the what I'm talk about when I say it's strokin.
At just shy of 3/4 throttle, is purr's like a kitten.

I haven't worked on many 4 mix's before. So I'm just wanting another opinion on what it's supposed to sound like at WOT.


#2

StarTech

StarTech

What you are saying sounds like it might be hitting the coil's rpm limiter which is set around 9500 rpms. Get out your tach and follow the following tuning instructions.

First set the idle speed and mixture.

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Without limiter cap the H speed is initially set at 3-1/2 turns from seated position. Enrich slightly to limit top speed below coil's speed limiter. Now you may go over the setting a few times as they do interact.


#3

Hammermechanicman

Hammermechanicman

4 mix engines don't rev like normal 2 strokes. Reving it with no load like star said will hit the limiter at about 3/4 throttle and will act like bad 4 stroking. 4mix engines have much more low end torque than the older 2 strokes. Load it hard in some heavy grass and see if it needs full throttle. Many older 2 strokes had limiting built into the carb or more likely port timing and they just topped out. 4mix do it with ignition.


#4

PTmowerMech

PTmowerMech

I'll get back to you guys on this in another day or so. Two days ago, I reached down to pull a weed, (bent at the waist) ended up flat on my face from my back going out again. Took me 20 minutes to get up and get back in the house.


#5

StarTech

StarTech

You're going to learn getting old isn't for sissies. And with back problems you have to change the way you do things. Like I use a 2T crane to lift 100 lb engines now. Just can't keep screwing up my back.


#6

Hammermechanicman

Hammermechanicman

PTmowerMech said:
I'll get back to you guys on this in another day or so. Two days ago, I reached down to pull a weed, (bent at the waist) ended up flat on my face from my back going out again. Took me 20 minutes to get up and get back in the house.
Click to expand...
I feel for ya bro. Been there


#7

PTmowerMech

PTmowerMech

StarTech said:
You're going to learn getting old isn't for sissies. And with back problems you have to change the way you do things. Like I use a 2T crane to lift 100 lb engines now. Just can't keep screwing up my back.
Click to expand...

I'm learning. I've pulled thousands of weeds like that. And barely a twinge.

I installed by 2500lb ATV wench a few weeks ago. Comes with a long cord with a control switch. I'm loving it.


#8

StarTech

StarTech

PTmowerMech said:
I'm learning. I've pulled thousands of weeds like that. And barely a twinge.

I installed by 2500lb ATV wench a few weeks ago. Comes with a long cord with a control switch. I'm loving it.
Click to expand...
There you go. It is working smarter as you age. I know I get laughed at for using that folding engine crane for picking up 100 lb lawn mower engine or one those heavy ZTR decks but my back thanks every night when I do.

And you can't tell the young that they need be careful about the bodies either. I had one the other shouldered 100 lbs of corn and walk over to my truck. When I was young I use to do something similar with 96 lb Portland cement bag. Those days are long gone.

And I am so bad about turning my ankles that flat refuse to wear dress shoes anymore as the last time I nearly broke my ankle just walking across the yard.


#9

Hammermechanicman

Hammermechanicman

When i pull a larger engine i take the flywheel off and i can just pick it up. Faster than getting out the engine crane.


#10

StarTech

StarTech

Really depends what engine you are pulling. There a lot stuff the has to come many verticals before you even get to the flywheel. Several Kawasaki I had to pull this year only need the sump re-tapped because the mount screws stripped out. And that Kawasaki 3010 engine is where it is nearly impossible to lift it out without one.

Then there was that horizontal shaft drive Cub Cadet that had to be pulled just to get to the ignition coils wiring. Even with the crane it was a pain to get out and just a little easier going back. Mice really did a number on the wiring under the shroud. Darn customer insisted it would only 30 minutes to take out, repair, and put back in. Well it took an hour just to get it out. He bitched to high heaven about the bill so I just charged for the parts and then told him never come back. An year of nit picking was back enough then when he start telling how to do my job that was the final straw.


#11

PTmowerMech

PTmowerMech

StarTech said:
There you go. It is working smarter as you age. I know I get laughed at for using that folding engine crane for picking up 100 lb lawn mower engine or one those heavy ZTR decks but my back thanks every night when I do.

And you can't tell the young that they need be careful about the bodies either. I had one the other shouldered 100 lbs of corn and walk over to my truck. When I was young I use to do something similar with 96 lb Portland cement bag. Those days are long gone.

And I am so bad about turning my ankles that flat refuse to wear dress shoes anymore as the last time I nearly broke my ankle just walking across the yard.
Click to expand...

I'm going to build a platform for the shop wench to pick up push mowers. Being on the edge of the shop, I think the handle will stick far enough out the opening to raise it to at least shoulder level. I'm thinking 1X2's will be strong enough for any push mower.


#12

PTmowerMech

PTmowerMech

StarTech said:
Really depends what engine you are pulling. There a lot stuff the has to come many verticals before you even get to the flywheel. Several Kawasaki I had to pull this year only need the sump re-tapped because the mount screws stripped out. And that Kawasaki 3010 engine is where it is nearly impossible to lift it out without one.

Then there was that horizontal shaft drive Cub Cadet that had to be pulled just to get to the ignition coils wiring. Even with the crane it was a pain to get out and just a little easier going back. Mice really did a number on the wiring under the shroud. Darn customer insisted it would only 30 minutes to take out, repair, and put back in. Well it took an hour just to get it out. He bitched to high heaven about the bill so I just charged for the parts and then told him never come back. An year of nit picking was back enough then when he start telling how to do my job that was the final straw.
Click to expand...

I had one like that with a Scag spindle R&R. Clearly told him "Most cases" it's any hour labor. Which is correct. Usually to pull, reinstall and test takes about 1 hour. His was a problem. Took me and another fella about 4. I took the loss and only charged him 2hrs.
He still complained. But I didn't budge on the 2hrs, because he was being a prick about it. Plus, he brought his own spindle that he bought from a competitor.

But karma, being what it is, when he brought me the new spindle, I could feel a slight bit of grabbing in the bearings. One spot in it seems to grab a little. Even after greasing it. He insisted that I use it. Two weeks later, he came back with it burned up. He watched me grease it when he brought it to me (to see if it would turn smooth). So there was no chance of him accusing me of anything.
I suppose I was smiling too much when I told him I still had his old one that I could rebuild for $250 (about what he paid for the spindle he brought). He decided to take it to the guy who sold him the bad spindle. I was glad.


#13

Hammermechanicman

Hammermechanicman

PTmowerMech said:
I'm going to build a platform for the shop wench to pick up push mowers. Being on the edge of the shop, I think the handle will stick far enough out the opening to raise it to at least shoulder level. I'm thinking 1X2's will be strong enough for any push mower.
Click to expand...
My mower lift has attachments that let it lift push mowers. Most time i just work on push mowers on the florr but if it needs more than routine maint i will lift it.


#14

StarTech

StarTech

PTmowerMech said:
I had one like that with a Scag spindle R&R. Clearly told him "Most cases" it's any hour labor. Which is correct. Usually to pull, reinstall and test takes about 1 hour. His was a problem. Took me and another fella about 4. I took the loss and only charged him 2hrs.
He still complained. But I didn't budge on the 2hrs, because he was being a prick about it. Plus, he brought his own spindle that he bought from a competitor.

But karma, being what it is, when he brought me the new spindle, I could feel a slight bit of grabbing in the bearings. One spot in it seems to grab a little. Even after greasing it. He insisted that I use it. Two weeks later, he came back with it burned up. He watched me grease it when he brought it to me (to see if it would turn smooth). So there was no chance of him accusing me of anything.
I suppose I was smiling too much when I told him I still had his old one that I could rebuild for $250 (about what he paid for the spindle he brought). He decided to take it to the guy who sold him the bad spindle. I was glad.
Click to expand...
I know some customers think we are just trying to milk them every penny we can at times.

In this case PT the other shop should warranty the new spindle. I just recently replaced a Stens spindle on a Z925A that I replaced 6 months ago. It was still under the Stens warranty so the customer got a free replacement spindle. I took the Stens spindle apart just find out why it failed. It turned someone used the wrong spacer washer and spindle had been binding all along. Stens let me keep the unit so I rebuilt it making sure the spacer was right this time around and the spindle just left this week. The retail on those JD spindle are $210.

And yes I rebuilt a few Scag 461663 spindles which are selling for $257 but I also replacing them with Oregon 82-325 spindles which are about cost as rebuilding the old spindles.


#15

PTmowerMech

PTmowerMech

StarTech said:
I know some customers think we are just trying to milk them every penny we can at times.

In this case PT the other shop should warranty the new spindle. I just recently replaced a Stens spindle on a Z925A that I replaced 6 months ago. It was still under the Stens warranty so the customer got a free replacement spindle. I took the Stens spindle apart just find out why it failed. It turned someone used the wrong spacer washer and spindle had been binding all along. Stens let me keep the unit so I rebuilt it making sure the spacer was right this time around and the spindle just left this week. The retail on those JD spindle are $210.

And yes I rebuilt a few Scag 461663 spindles which are selling for $257 but I also replacing them with Oregon 82-325 spindles which are about cost as rebuilding the old spindles.
Click to expand...

I spent a lot of time trying to figure out ways to cut a customers cost, than I ever did trying to figure out how to charge more. Maybe a lot of us are that way.
Which would explain why none of us are millionaires. lol


#16

PTmowerMech

PTmowerMech

Hammermechanicman said:
My mower lift has attachments that let it lift push mowers. Most time i just work on push mowers on the florr but if it needs more than routine maint i will lift it.
Click to expand...

I sure miss my two post vehicle lift I had at my other shop. I used certain boards to put push mowers onto and raise them up in just a few seconds. It was a lot easier getting the carbs, blades on and off. It seems a little drastic. But bending over several times a day, takes it toll.
It was around November of 2020 that my back really put me down. That lasted until like march. Luckily it was the slow time of year. But I still needed make money.
Had it not been for that lift, my ship would've been sunk.


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