Used replacement engines are scarce for the RTVs. Rebuilt units are close to the price of new, when including the core and shipping costs.
That new engine should last a very long time, with proper maintenance.
Use this adapter for the glow plug port. The Kubota pn is 07909-31301
https://www.amazon.com/Lang-Diesel-Adapter-M8-1-00-LNG-TU-15-35/dp/B01MSMUR2R
Instructions to run the compression test can be found on page 1-S10 in the RTV900 WSM...
Seems that you addressed the obvious stuff.
Since the engine runs okay, with no fuel to cylinder 2, I suspect a cracked cylinder head or broken piston ring.
How many hours on the clock?
There have been reports of no radiator bubbles with a cracked head.
In my case the radiator was blocked...
I have a 2006 RTV with the same issue.
It's easier for me to just kill the engine to switch gears.
The pressure relief doesn't always work, while changing gears on a hill.
The first time I heard of this relay.
Here is a site that should answer your question.
Click on show models and then select your model to see the location diagram.
https://www.messicks.com/part/t0070-31410/relay
I cruised thorough your YT videos but did not see any mention of the engine work.
If you don't mind me asking...
What was done to resolve the cracked head and the new donor engine?
4. Is it a secret society that I'm not allowed to join?to get these parts counter people to explain their parts diagrams is crazy.
The local K dealer counter people have no clue.
Best to contact Messicks technical support, the best source for info IMO.
https://www.messicks.com/contact
Since you were gifted with a new engine, at a rock bottom price, I would go with that.
If you decide to swap the head check the engine deck for flatness first.
If bore scoring is minimal I would not go through the expense of machine work.
The center bore of my engine was scored a bit, it...
Since the hydraulic dump bed was optional it would have been difficult for Kubota to run the PS the way you describe.
Maybe this will help with engine id.
My RTV would overheat, climbing hills. Pulled the head and found a head crack for the center bore.
The eBay seller pleaded innocent, said he would find a replacement. Of course that never happened.
I discovered that a seller can delete negative comments, for purchases not paid by PayPal.
I...