Hyundai lawnmower slow self drive

[Hahadumball]

I've just purchased a used but only 4 times hyundai hym51spe to replace my trusty sovereign, sovvy worked great once started with a drill because the pull start died and it took a good 10 pulls to start the thing... anyway..

146cc sovvy self drive pulls itself for the most part up the steepest part of my garden yet the 196cc hyundai barely pulls itself along on flat ground, I made the mistake of taking it to the bottom of the garden and trying to mow up just to test it and basically had to push the entire weight up the hill.

Anyone else have one of these to confirm if they're just shit for self propelling? If they are then she's gonna have to be resold, reason for buying a bigger engined mower was to make life a bit easier
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Fin: no matter how much I look at It I can't understand what was going through my head, all I remember is going about 80 and redlining it to stop it seizing.
360 Deg... Five 1/4 turns. :- Teflon-Mike 18 Jan 2015

[sickpup]

RTFM, 15degrees max slope so flat only really.

[carvell]

I have a hym460spe (same, but smaller) and it pulls itself along absolutely fine across my garden. If I try and hold it back it'll grip and wheel-spin.

Perhaps your drive belt is slipping? Or is the speed controller stuck on snail?
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Yamaha TDM 850

[Hahadumball]

[Easy-X]

For some reason "self-propelled" conjured up images of lawnmower racing The actuality:

https://toolshouse.co.uk/cdn/shop/products/HYM510SPE_MAIN_IMAGE-2__18993.1628255551.jpg?v=1642976176&width=500

Anyhoo, a motor that size should absolutely fly along. I mean, arguably it looks to be styled as a racing mower

If the engine sounds to be running sound and the blade's turning at a reasonable speed I'd be looking at the clutch.
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Hahadumball]

Update:

After tightening the drive belt upping the revs it still didn't work, until I found the cable for the self drive lever was slacker than smilers subframe.

Now it drags me up the garden with ease
____________________
Fin: no matter how much I look at It I can't understand what was going through my head, all I remember is going about 80 and redlining it to stop it seizing.
360 Deg... Five 1/4 turns. :- Teflon-Mike 18 Jan 2015

[Easy-X]

I wonder if the "only 4 times" people never set the thing up correctly in the first place Hope you snagged yourself a bargain!
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Royal Enfield Continental GT 535, Husqvarna Vitpilen 401, Yamaha XSR700, Honda Rebel, Yamaha DT175, Suzuki SV650 (loan) Fazer 600, Keeway Superlight 125, 50cc turd scooter

[Hahadumball]

[Stripperbo]

Check the self-drive cable. If it’s too slack, it won’t engage properly. Mine was so loose it was basically doing nothing. Once I sorted that out, it started dragging itself up inclines without an issue.
If you’re still having trouble, maybe hit up a Hyundai Engine Specialist. They might know if there’s a bigger problem. Honestly, small fixes made a world of difference for me, so hopefully, it’s just that.