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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...

Thanks. I'm miles past that though. It passed that test. Coils also passed all Kohler manual ohm tests. I rechecked timing per the manual and it passed. And I swapped coils left to right (verifying gaps too) with no change in the cylinder that was running rich. I'm near 100% sure my coils and...

I'll pressurize the cylinders again with the valve covers off to see if I hear the oil galleys making noise. At this point I already ordered head gaskets though (cheap) and am not scared to do a full rebuild with new rings and a hone job. At 1200 hours it certainly couldn't hurt. Especially if...

Haven't done a cold compression test. Kohler manual says engine should be warm. I can run one but I'm not sure what good those numbers will tell me??

It's not smoking a whole lot. Although it does suffer from the Kohler full throttle shutdown syndrome where it smokes briefly on startup if you don't let it idle before shutting down previously. And my plugs are not wet. Matter of fact, #1 cylinder is soot black (always) and #2 cylinder always...

Thanks Cajun. All good suggestions. I'll run through the ones I haven't done yet. I've done a lot more testing but stopped posting in this thread for a few days so some of these things already "passed". At this point I'm 100% sure my ignition system is good based on further tests. Everything...

That's the issue, it bogs heavily under load. Mostly trying to get up small inclines or through medium thick grass with blades engaged. The mower slows to a crawl in those situations. I've been through everything, electrical (coils/etc) and in that process ignored the cylinders because I had...

Kohler command pro 27. After warming up the mower I get about 160 PSI in both cylinders with my compression tester. But then, when I pressurize both cylinders to 50psi at TDC (poor man's leak down test) I get air hissing and escaping through the oil fill tube (cap off). Pretty fast actually, it...

Yeah, when I first brought the mower home (bought cheap, with issues), one of the first things I did was pull both plugs and the #1 was dark dry black and the #2 was golden brown. I've swapped clean plugs twice since and #1 always comes out dark dry black while the #2 varies from white to golden...

I pulled the flywheel bolt off and looked in the keyway with a flashlight. It appears to have a key, and it looks lined up and intact. I think I will swap ignition modules like you suggested and see what that does to my plugs. They both ohm tested good and are putting out (what appears to be)...

Can you outline this procedure? I had both valve covers off earlier today and measured as best I could both sides (cyl1 & cyl2) as I rotated the crank. All the valves had very close to the same travel. Nothing seemed out of the ordinary.

Without pulling my flywheel to check the key, can someone tell me if this timing looks right? Pictures are of both cylinders at TDC. Motor bogs down under load. Motor has 170-175 compression. Fuel system is new front to back. Both cylinders are getting spark and pass all the Kohler manual ohm...

Ok, I've dug into your suggestions and have a question at the end. 1. My Kohler has 'Smart-Spark' and I've run the timing advance test per the manual. 1. Make a line near edge of flywheel screen with a marking pen, chalk, or narrow tape. 2. Connect an automotive timing light to cylinder that...

No change. Back to the drawing board. Both cylinders are getting good spark (checked). I did notice something different though. Note that before I did any work, right after I bought this mower I pulled the plugs and the right side was golden brown and the left side was dry soot black. I put...

Well as I continue down this path I've discoverd that my ignition module gaps were way too small. Kohler books specs .28-.33mm but mine were almost zero. I could barely put my smallest feeler (like aluminum foil thickness) in the gap. In order to set the proper gap I had to clean up both the...

So wait, then what is this whole chapter for in the Kohler manual then? The whole point of testing is to verify that it's internal workings aren't shorted. If it fails testing then it needs replacing. I know you can't repair them.

Pulled the dust cover off this morning. What a pain. For a dust cover this thing is bolted stronger than the motor itself. Sheesh. In any case, are we feeling like this is an issue? I haven't done any multimeter testing yet to the coils but that pickup (?) looks awful crusty. Can I just sand...

Thanks bertsmobile1. I'm reading through the Kohler CV740 book as we speak. And ironically I'm at the ignition coil section. Tomorrow I'm going to look further into that chapter and do some testing like you suggested. It sounds like low (or no) spark is a very good possibility. But then again...

Did you ever solve this? I'm experiencing the same problem with a Kohler CV740 on a Gravely 260z. Runs fine with a new carb/filters/fuel pump/spark plugs/etc etc but as soon as I push the sticks forward the motor (rpms) start to slow down. With PTO engaged it's even worse. It winds down to...

Hey everyone. I'm new to zero turns but very mechanical in experience (ex Navy fighter jet mechanic). Got a used 2005 260z (Kohler CV740 Command Pro 27) for cheap that starts and idles (and throttles up and down) perfect. Sounds good sitting still. Even starts mowing like a bat out of hell for...