Predator engine swap - Page 2

AGuyThatUsesOldTractors · #11 07-04-2023, 09:34 PM

I did think about LEDs as a possibility, but in reality I'm probably not going to ever mow at night so I won't bother for now.

A little update on it though. So I've used it to mow for a couple hours and it runs (mostly, see below) great. It's smoother and quieter than the Kohler and oddly, the tractor seems to ride nicer. I can't explain that other than maybe it is a lighter engine and sits back further so the weight is more over the rear tires so it's less bouncy up front.

But it hasn't been 100% smooth sailing. I checked the oil and it wasn't at the "full" line. I wasn't worried about it burning oil but figured that some went into the oil cooler and filter after the first run and I did loose a little when I installed the oil pressure gauge. So I topped it off and did another mow. Half-way through it starts billowing smoke, but only when I'm on a grade. After the initial shock I knew right away I had over filled it. I went to check it and it was then I realized the rubber "cork" that is on the dipstick was moving around so I wasn't getting an accurate reading. Second ding on the Predator quality. Fortunately the stick is painted black where the cork should be positioned. I left a little oil out and that problem was solved.

However, as I was getting to the end of the mow, it stalled. After some extended cranking it restarted and I mowed some more, then other stall. I was able to finish but I think it's the fuel pump not supplying enough when under load. I read here or somewhere about their fuel pumps not being so great. So I guess I'm going to be replacing that. Another ding on the Predator.

So all in all, I'm not super satisfied with the quality. 3 problems -- faulty starter, crappy dipstick, and (most likely) a crappy fuel pump. You get what you pay for I suppose. However I put a Duromax 713 on a buggy and that didn't have any problems and as of now they are the same price as the Predator ($999) so I would go with one of those if I would have to do another. The downside to the Duromax though is no muffler, so I'd be making one from scratch or adapting something to fit.

AGuyThatUsesOldTractors · #12 09-04-2024, 08:08 AM

Just figured I'd post a little update on this.

Been using this swapped tractor for mowing regularly and it's been running fine. You really have to make sure the choke is fully closed when starting and it takes a few cranks. I assume that is because of how lean these carbs are tuned.

I figured out the starter problem -- it was my goof, I didn't have the Predator's starter solenoid hooked up so it wasn't kicking the gear in (headsmack).

The battery charging is borderline. It has to be run WOT when mowing or the battery will gradually discharge and after a couple hours you have to throw a charger on it or keep it on a trickle charger.

The other thing I've noticed, alarmingly, is that under a certain set of circumstances the oil pressure gauge will drop to 0 for a second or two. The circumstances are: fully hot engine (thin oil), WOT or near to it, a rapid travel direction change from reverse to forward, while on an incline.

The first time this happened it scared the dickens out of me, seeing the oil pressure gauge at 0 on a brand new engine is frightening! I instantly turned the key off but before the engine could even wind down the pressure was already coming back up.

Over time, this happened again and eventually I noticed the precise circumstances of when it occurs but I am very puzzled by it. Puzzled by why it happens but also why it doesn't seem to really bother the engine. Naturally I try to avoid the circumstances, but it does happen occasionally and with no seemingly ill effects. My assumption is that the oil pickup becomes uncovered from the oil sloshing towards the flywheel side of the engine.

I hesitate to say it's not a big deal, because it seems like it should be, but yet I see people putting these engines on all kinds of things, including swamp boats, buggies, etc. and in all my research I didn't find any recurring evidence of them grenading because of oil starvation. Since I know why it occurs, I can mostly avoid it and when it does occur, I just pause for a second, sigh, and continue mowing...

AGuyThatUsesOldTractors · #13 05-03-2025, 03:15 PM

Another notable development, for those that are interested.

The site where I got my mounting plate, Performance670, has changed to Performance Machine and Design and I think now has more hub adaptors, including one I think would've worked on my 682.

They also have parts available for the Duromax 713cc v-twin which I think may be a better engine than the Predator. I repowered a Honda Odyssey FL250 buggy with one of those a couple years ago and it has been a good engine, taking a lot of abuse.

Currently those engines are on Amazon for $799 with free shipping, which is a steal (I paid $999) The one downside is they don't come with an exhaust. You'll have to buy the exhaust flanges and fab your own.

Oak · #14 05-03-2025, 03:24 PM

Got a link to that Duromax? I can't find it on Scamazon.

ironman · #15 05-03-2025, 05:32 PM

Quote:

Originally Posted by Oak

Got a link to that Duromax? I can't find it on Scamazon.

Amazon, where it's $799
https://www.amazon.com/DuroMax-XP23H...089KVXRYZ?th=1
Duromax, where it's $999
https://www.duromaxpower.com/product...SAAEgL2cvD_BwE

Go figure?

Oak · #16 05-04-2025, 09:29 AM

Thanks Ironman. It's weird that I type in duromax and I got generators and smaller engines but not the xp23 engine on scamazon.

That's a great deal.

ironman · #17 05-04-2025, 12:31 PM

Not a bad price at all but if you read the reviews on the Duramax site, not all of them are glowing.
And I tried looking at their Parts Finder and it's a joke, zilch info.
Then looked at the engine manual, same joke, different punch line, no part numbers.
I'd do a lot of calls to their customer care line before purchasing.

AGuyThatUsesOldTractors · #18 05-10-2025, 04:41 PM

It's been a while, but I think I remember finding a parts manual for a Duromax generator online that uses the 713cc engine and it had a parts breakdown of the engine.

Here's a video where a guy found and bought the muffler and he shows the part # for the muffler and gaskets.

https://www.youtube.com/watch?v=rAjqJ-cJNZg

But yeah, you'd think that designing, building, and marketing AN ENGINE would be the hard part and that producing a manual with part #'s would be painfully simple and and self-evidentially necessary.

I just don't understand what goes through the "mind" of some of these companies.

johnwd98 · #19 05-11-2025, 08:56 AM

So, after all is said and done, it would seem that these two engines being discussed may not be the best choices for an engine swap?

ironman · #20 05-11-2025, 11:51 AM

Quote:

Originally Posted by AGuyThatUsesOldTractors

It's been a while, but I think I remember finding a parts manual for a Duromax generator online that uses the 713cc engine and it had a parts breakdown of the engine.

Here's a video where a guy found and bought the muffler and he shows the part # for the muffler and gaskets.

https://www.youtube.com/watch?v=rAjqJ-cJNZg

But yeah, you'd think that designing, building, and marketing AN ENGINE would be the hard part and that producing a manual with part #'s would be painfully simple and and self-evidentially necessary.

I just don't understand what goes through the "mind" of some of these companies.

Watched the video you suggested and came across another with lots of good info....
https://www.youtube.com/watch?v=3uS6oZbom_0