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Discussion Starter · #1 · (Edited)
Hello!

I have an X300 that I purchased new in 2006/7. It starts up fine and I can mow for ~20mins before it starts to stall. If I disengage the blades, the engine stabilizes and will remain running. Re-engaging the blades will cause the engine to stall again. After letting it cool for 10mins, I can restart it and mow for a few minutes before it stalls again.

I have cleaned the vented gas cap and even ran it without a gas cap but this had no effect.

I have not been running it on ethanol-free gas. But for 12 years I haven't been and never had an issue.

During the stall, the amount of gas visible in the clear plastic fuel filter is normal.

Any help would be greatly appreciated.

Thank you!

Stalling X300 - YouTube
 

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The problem goes away when the PTO isn't engaged so it would seem that your engine is fine. You have a PTO and/or mower deck problem from the sound of it. Being that it runs for a bit before the problem starts, it's likely heat related.

If it were my mower, I'd pull the deck and check the spindle and idler bearings. If those are good, the PTO itself may be suspect. It's got bearings in it too and they can go bad.
 

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Not familiar with an X300, so just a question and possibilities!

Mechanical pto or electrical?

If mechanical pto, probably a problem with the deck. Most likely spindle bearings are heating up and seizing.

If electrical pto, coil could be "going south" and getting heat soaked. This will draw more amperage and take away from amperage needed to run engine. When engine begins to stall...or stalls...disengage pto, turn engine off, remove belt drive belt as quickly as you can, restart engine, and engage pto. If engine still falters it's pto coil. If not probably deck bearings. Bob
 
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Hello!



I have not been running it on ethanol-free gas. But for 12 years I haven't been and never had an issue.

During the stall, the amount of gas visible in the clear plastic fuel filter is normal.


Stalling X300 - YouTube

My two cents .... it could be be a fuel issue. I'm no fan of gas/ethanol blends for outdoor power equipment based on my own experience and that of others. They don't store well; an Echo service school I attended some years ago recommended no more than 30 days storage for a fuel mix without a fuel stabilizer and 60 days with. Ethanol has an affinity for water- what you saw in your fuel filter could have possibly contained water. Our 2007 X320 (closing in on the 1100 hour mark) has had an issue since new where it would occasionally backfire on shutdown ... sounded like a Remington 870 going off in the garage. Tried higher octane fuel (89 and 91 octane; E10 was the only thing available at the time) to no avail. Deere suggested idling 2 to 3 minutes and when that didn't work, they suggested suggested shutting down from medium rpm's which didn't help either. When ethanol free fuel became available I ran the X320 on that - problem solved! That was quite a few years ago. Last year, just for grins I ran a couple tankfuls of 87 octane E10 through it and the problem returned.

Fuel may not be your issue but it wouldn't take much to rule it out. I'd change the fuel filter and try an ethanol free fuel if available. If not, at least try a different brand/station/higher octane. Fresh plugs too if they've been in for a while. Let us know how how it all turns out.
 

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How old is the battery, the electric pto needs power to run if your battery is getting weak it can't handle the load. Another thing to check also is the battery cables. I had positive cable that was all green with corrosion but couldn't tell unless you pealed the casing back a little.
 

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A very common issue on the older X300s was ignition coil failure when hot. It sounds like a coil going bad. One cylinder is not firing and with the pto engaged the other cylinder can't handle the load. After the coil cools off it returns to working.
When it starts to mess up, unplug a plug wire and see what it does. If there is no change. Then that is your dead cylinder. If it stalls, that was the good cylinder and your bad one is on the opposite side.

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Discussion Starter · #7 ·
Solved!

I resolved the issue and mowed for a solid 2 hours yesterday with no problems.

I re-seated and re-gapped the sparkplugs and it solved the problem. Perhaps one of the wires was loose too but I didn't think about that until after I had pulled them off.

Thank you, everyone! I appreciate the help.
 
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