Coming into 2019 having collected two successive premierships in unbeaten fashion, the side had lost just once in its run to Saturday's New Holland Agriculture Cup major semi-final.

But there has been moments this year.

Moments when motivation has been an issue and numbers at training have dwindled.

It's expected when you've enjoyed as much success as the club has in recent years, but those battles also made Saturday's dominant victory over CSU all the sweeter.

The Narromine side was back to the Gorillas of old at Cale Oval, a highly motivated outfit littered with experience and led by a powerhouse forward pack that refused to allow the opposition to have any meaningful time with the ball.

As CSU coach Dave Conyers said post-game, it was a Blowes Clothing Cup-type performance.

In one of the most clinical and high-class performances across any competition in Central West Rugby Union this season, the Gorillas crushed the students 57-10 to ensure hosting rights for a third successive grand final.

"That was our best game for awhile. We haven't clicked as good as that for awhile," captain-coach Craig Campbell said after the win, before speaking about the motivation.

"It's been tough lately. We've really dropped off this year.

"We'd had troubles keeping players at training and that kind of stuff.

"But, the older guys. They lead they way and once they pick it up it gets the same feeling back.

"There's no magic pill, I can tell you that. It's a lot of hard work from a lot of guys and I'm glad we're a team, not just one or two stars. We're very lucky to be where we're at and we all appreciate that, too."

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After a relatively even first 10 minutes in Saturday's major semi, where CSU took the lead through a Jack Keppel penalty, the Gorillas began to take control.

A quick shift to the left on halfway and break from Mitch Rixon led to flying winger Jake Brennan racing away to grab the hosts' opener, and just three minutes later they were in again when a charging Charlie Tuck set-up a five-pointer for George Hancock.

The final 10 minutes of the first half was where the Gorillas' strength really showed.

A powerful scrum and rolling maul led to a try for Bill Rybak, before sustained pressure allowed John Ellis to cross and grow the lead to 26-3.

In the final stages of the half Hancock grabbed his second after a smart kick from Tuck and Doug Potter nailed another conversion to make it 33-3 at the break.

CSU captain Jack Keppel issued a rousing speech to his players in the break but there was nothing his side could do against a Gorillas team which refused to take its foot off the gas.

Scrumhalf Jono Sharpey took a quick tap following a penalty three minutes into the second half and a shift to the right resulted in a simple try for Ryan Pratten, who was among his side's best despite playing out of position at fullback, and it wasn't long before Campbell crashed over from close range to set-up a 45-3 lead.

CSU scored a consolation through Keppel in the final minutes, but that was sandwiched by further five-pointers to Narromine's Sam McLeod and Jack Neill which iced the massive win.

"You can't beat experience and size and Narromine has got that," Conyers said.

"They play great as a team and had the combinations going perfect so it was very hard to get the ball off them.

"They do things right. Full credit to them and they should be in Blowes Cup, that was a Blowes Cup performance."

Conyers went on to say he and his players "want another shot" at the Gorillas in the decider but the students will have to get past either Mudgee or Blayney next weekend to make that happen.

Narromine, much to the delight of Campbell and his fellow more experienced teammates, will enjoy a weekend off before the decider.

"I think it's a just reward for our season," he said, adding he expects to play CSU in the grand final.