Recent content by Turbodriven

Yeah, she's clean. I'm on hold waiting for a ring compressor in the mail today. I'm used to just pinching in 2stroke rings but this oil ring ain't having it. 😜

The Kohler manual says: Three different types of connecting rod bolts have been used and each has a different torque value. If 8 mm straight shank type bolts are used, torque in increments to 22.7 N·m (200 in. lb.). If 8 mm stepdown bolts are used, torque in increments to 14.7 N·m (130 in...

No, I didn't. Just TDC. I guess it's a moot point at this stage since I just honed both cylinders for new rings. However I will say that both cylinders looked really good. A bit glossy but with visible cross hatching in both still. No scoring or anything. I don't have any bore measuring tools...

It has not. However the seat is already disabled. I'll double check but I'm pretty sure it's just the two seat switch wires twisted together and insulated. If there was something "off" in that I'd feel like it would cause problems in all levels of operation though.*shrug. And certainly wouldn't...

I'm replacing the one with wear on it (see post #52), and I'm disassembling the other three and cleaning them. That said, I've pulled one apart already and it looked super clean with no issues. On that note however, and I talked with someone else about this too, but I'm not 100% sure what kind...

In my OP checklist I put a string on the governor lever (which is of course attached to the throttle) and under the rpm drop under load I pulled on the string to no effect. Full throttle has the throttle plate fully open (verified). So that tells me the throttle is full open under load. Also...

This motor has no compression release. And hydraulic lifters with no valve adjustment.

Line 30 and 31 of my OP checklist sort of verified that at least the intake seal isn't leaking (and this motor has no seal on the exhaust valve by design). But I removed the #1 valves yesterday and they don't seem loose in the guides. Not tight, but not loose either. Guides are positioned...

The test results of this are in post #32 and a follow up in post #46 in the Kohler thread I linked to above. There is also a video of it starting at idling (low and high), and of it running and dropping rpms in post #31

Thanks for the response. A few weeks ago I moved this to the Kohler forum and streamlined the long list of things I've ruled out. Since they were all kind of all over the place here. https://www.lawnmowerforum.com/threads/cv740-27hp-bogs-severely-under-average-load.75051/ It's becoming a long...

I was in the shop this morning and took a better look at my lifters (and got a better pic). They are all perfectly smooth except #1 intake (top left in pic1 with matching cam lobe the one nearest to it). You can feel that wear on the lifter with your finger. A. would you be concerned about...

We talked about it in a different thread. I had the DSAM system apparently. The box was 24 584 27 and the coils were 24 584 15. I assume now they were all working fine?

Yeah, and although I'm sure they're not perfect, as mentioned before... I don't think this is my problem. So with that being so, I'm not willing to drop $500 on a new crank/cam/and lifters for sure. I'll bleed the lifters like you mentioned, hone and ring job the cylinders (need to make sure I...

See the pic. It's hard to get a good one as the mating surface of the lifters are almost chrome and it reflects my led shop lights. 😜 On this subject, in your experience are these Kohler lifters the exact same as GM/Chevy small block lifters? I've heard they're the same (and they look the same)...

Yes. I should have taken a video. When I unplugged either side, it was difficult to start. With both cylinders it's usually it's a pretty easy crank or two even at low idle throttle position, but with one side unplugged it struggled to start. A little 50-75% throttle feathering and she would...

It's belt driven hydros. I've definitely considered malfunctioning hydros externally putting too much load on the motor, but that doesn't explain my carbon fouled cyl #1 (only). And this thing should normally run at 3300rpms under normal loads. I only weigh 175lbs 😜. Back to the blades.. When...

I'm in the office today, I'll look when I get home. Are you implying that a crack could allow the gear to slip? I thought we ruled that out when we verified exhaust tdc to be correct?

I currently have the belt off so I could take a video of the spindles spinning by hand. They don't sound gritty to me like bad bearings would. I'll check again though with some side tension applied. And I'll take a pic of the blades but I did sharpen them. No idea what they are though. It's...

Ok, so I really don't know what I should do at this point. To be honest, I don't see anything glaringly wrong anywhere inside this motor. No cracks or case defects. Cam lobes all measure the same, governor gear assembly looks good. Crank seals are tired but they weren't leaking (I'm going to...

Nope. I haven't done a full inspection but I got a pretty good look at the heads when they were off and a decent look at the cylinder sections. That said, it wouldn't surprise me if this thing got a bit hot in it's 1200hr life. I'm in Florida so we're in a pretty warm climate and the fins were...

Essentially yes. I would say that I feel like when I first got it I could still mow my lawn with a bit of a struggle. But now I feel like I'm a bit worse. Seat of my pants meter only. I could just be frustrated. None of the data has changed though. Still bogging about the same. Still getting...

I did this and just grounded the unplugged boot with a alligator clip test lead. (note, I think these new MDI coils have built in protection though. As they have a lead running back from the boot and grounding out under a bolt of your choosing). Neither side runs great by itself and neither...

Ok here you are with the videos. First video, cold starting and running. Second video could use some narration as it's loud and bumpy (my yard isn't as smooth as I'd like) and I'm trying to drive a 2 stick zero turn with one hand in most of it. 1. First part is me running with blades...

Yeah I'm almost certain it's correct. I base this on the following: the flywheel that comes with the 24-755-308-S MDI conversion kit has 8 gear teeth between the keyway and the start of the magnet. So does my flywheel. It's a little different in overall design but the timing degree is the same...

Well, it's not the exhaust. Interesting note, it runs like absolute dog sh@t without the muffler attached. Still dropping rpms though. With the added poor running, it was almost un-driveable now. Also interesting, is the residue left from each cylinder. I took pics. The exhaust from the heads...

If it's the exhaust, I'll throw a party I swear. Fingers crossed. If not, I'll take a video. Or two. One of it starting cold and throttling up and down with no load. And one mowing showing the precise issue on the tach.

I just took a look in the Kohler manual. It appears as if 7mm is a bit out of spec? Unless this needs to be done on a hot engine (hydro lifters freshly pumped up)? The motor has been cold and sitting for a few days. Again though, #1 and #2 are the same amount out of spec. So it wouldn't explain...

No, I bought it about a month ago with a slew of problems. Mostly electrical issues which I sorted out. It was completely missing a starter relay for example. And wires were cut and/or not hooked up to the ignition switch (ad said it needed a new switch, but it did not) But no, it always had...

I've taken the exhaust off a few times now. It's not hard. It'll be loud but I'll try running it without to see what happens. Previously I blew through each exhaust port with (sealed) compressed air. #1 wasn't "holding pressure" different than #2 or anything but the testing method did seem...

No, valve covers are still off. I'm kind of tired of disassembling this thing and then putting it back together so I took a break today and cleaned up my gas leaf blower instead. I will though. And you're talking about just at high idle with the intake hoses off? What does that indicate if there...

Correct. So the big question is how to test that hydro system? Or instead, what would cause a hydro system to have excessive load? If that's even possible? Fluid level is good and looks clean but it has a massive filter that I haven't changed. A clogged filter can't be an issue though, as it...

Following up on the valve timing check. At TDC exhaust stroke (on both cylinders), the valves teeter right at exactly TDC. I'm going on a limb and saying it's not my issue. 😭 The more I dig in, the more this motor is proving to me that it's healthy. Ugh. Is there any chance this is an external...

Honesty, she starts easy, revs easy, and to my untrained ears sounds fine with no load. It sounds like every other lawn mower I've ever owned. Again, untrained ears. But I digress. When I push the sticks forward after engaging the pto it's just like someone flips a switch and she falls on her...

Yep. Line 32 and 33 of my 'checklist'. All four valves open and close the same amount (+/-0. 2mm). Measured with a straight edge running over the valve cover mating surface on the head (as a baseline for each measurement).

OK, thanks. As it would happen, I currently have both rocker covers off right now. I'll check that in the morning and report back. To be honest thiugh, if this would be even just a little bit off I'd expect some sort of interference with the pistons. No? Edit : I guess if it was off enough the...

Oh sorry. Yes, I did. Checked the magnets too. 😝

Can you elaborate... or point me to a source that references how to do this?

Thank you for the idea. In his thread it appears as if he had the wrong flywheel which put him out of time. Although I'm certainly under the belief this feels like a timing issue, I don't think I have the wrong flywheel. When I upgraded to the MDI ignition system, I did a lot of research, and it...

Can anyone help here? 😭 I'm absolutely baffled by this issue. I am now 100% out of ideas. The problem presents itself in two ways. 1. Within the first few moments of average load mowing, the motor RPMs dip significantly (about 5-10 seconds after engaging everything ). The greater the load, the...

That's all I really needed, yes. Thank you. Strange about the wire harness colors. And I took a more precise measurement on the flywheels, the 58-S is 56 degrees from keyhole to center of magnets, and mine is 53 degrees. Close enough for me. And since Kohler themselves say the DSAM doesn't need...

Exactly. Mine has yellow and brown on each coil. No way it could have ever been pink (or red) on cyl2. Also, my flywheel serial number is 24 152 03 (I think 3, last number is hard to read). The 308 kit says it comes with a 24 025 58-S flywheel. Different numbers for sure but I measured the...

Thank you for the info. That is great news. Hopefully I can cancel the 307 order. 😬 What's still confusing is why did Kohler put this in the manual? It certainly leads you to believe you have an ASAM based on the wording (and my harness is yellow/yellow).

I may have answered my own question. 24 755 307-S is a CDI system 24 755 308-S is a MDI system. I'm not sure how vastly different they'll affect my Kohler? I'm not running any marathons here. Will the CDI system work I wonder? For what it's worth I got the whole 307 kit for $165 shipped. The...

I'm completely lost here. Hopefully someone here has some deeper knowledge than I can seem to find. I have a Kohler CV740 (27hp) motor on a 2005 Gravely 260z. No plate on the motor, must have fallen off. I have a black "Smart Spark" box though on the side with the number 24 584 27 on it. And...

I respectfully disagree. To begin with, not including the parts the mower actually needed (like new filters, belt, etc) I've only spent about $46 on this $600 mower. And most of that was on a new carb. Mostly because I just needed the gaskets it came with after tearing the ones on the mower. I...

As a follow up (hopefully to close the thread) I've narrowed my motor problems down to either rings, valves or a head gasket issue (despite having good compression). Everything else has been looked at and tested good, so I pulled the heads. My valves are sealing and within specs in all ways...

The idea is that if somehow your mower is running on only one cylinder, you wouldn't necessarily notice it outright as it will still run and sound fairly ok with no load. But to check for this, you pull one spark plug cable (say the #1) and if by doing so the mower shuts down, then you know the...