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You mean MENTAL issues

A polish on the cylinder is an OK thing to do, I never had one that needed it.

To hand lap the head to the cylinder, lock the cylinder in a vise, apply lapping
compound to the head, place the head on the cylinder and rotate back and forth
checking until done -- it can be time consuming.

Sealing ...

What's your end goal here? Are you going to hone and re-ring?

In any case the standard approach is to hand-lap the heads to
their respective cylinders. Or if $'s are no object get them fly cut.

I've done several top ends and hand lapped with good results.

BTW now that the heads or off, you really ...

OK, well that should help. But it's still odd that this 712 is that hot
given the conditions are not that severe.

Don't forget to check timing. There's a recent thread on this forum
for how to do so. Rev her up and make sure your getting progressively
more advance with RPM. If you run with ...

What you are describing fits a heat soak condition into the intake manifolds.

These are under the tin, inside the cooling plenum. They connect directly to
the intake ports of the heads and can get hot when the engine is turned off
with no airflow for cooling. If they get too hot atomized fuel in ...

Hard one to diagnose.

But... You say first start up it runs fine, does it continue to run well for an extended
period of time without stumbling?

After you stop and then let it rest for 15 to 30 minuets THEN it runs like crap, if you
run it for some time after it ran poorly does it then ...

Should be just fine -- dialed into the right profile; LEd Acid, AGM or LPF.

Beats me what the gain is, but it can't be anything good

I believe the eSteering units come from Ezpowersteering out of the UK ?
https://www.ezpowersteering.co.uk/car-brands/pinzgauer/pinzgauer-710-en/pinzgauer-pinzgauer/

Same ECU and motor at least. If you click on the manuals tab above link there's
installation instructions but they woefully lack ...

I run a PinzSSI 2.0 (PowerARC ignition) in my 712. I've had some challenges through the years
biggest PITA being dust contamination (my fix for that later). Overall it has been a good upgrade.

A concern is the End of Life announcement due to retirement at PowerARC. It's been a good run
for them ...

The original was just worn out. The mating piece inside the
female connector was slayed out from use and repeated tweaks
to bend it back in place just didn't work anymore. The new one
"appers" to be a better construction -- for a change.

Got sick of the poor connection to the 24V DIN power socket.
These sockets are located under the dash on the turn signal "Blinker"
plate, behind the Locker box and in the LH side Trail light area on
some models.

Found this replacement on AMZN that fits perfectly. It also has
a nut that cuts into ...

Just an FYI, been through 2 sets of Optima Yellow's on my 710K Pinz'y.
Fist set had some years on it from the PO. Second set was all
on my time. Both sets lasted a scoot over 10 years. Ironically,
I just replaced my 2'nd set two weeks ago, Datecode was 8/2015.

So....if your only getting 4 years ...

Battery Tender is a good brand. I have one to keep my LFP 12V AUX battery topped off.

Should be fine keeping your pair of batteries in a float state. I'm a bit surprised you even
need a trickle charger -- assuming you open your Ground switch. Then you only have a
rather small internal-discharge ...

Yup and to add to this, not only is this a rare 2'nd gen Pinz but Dave took METICULOUS
care of this rig. An event Princess only on paved roads only.