View Full Version : Predator 420

11-06-2014, 12:53 AM
I am planning on using a predator 420 to power my shredder 2. I have been reading about the torque converters. Anyone have suggestions on which one to use. Appears comet is the favorite. They are pricey though. Any other recommendations?

Thank you.

11-06-2014, 01:24 PM
The primary (one attached to the engine, also called drive) clutch may be a proprietary unit for that engine. Have you found aftermarket offerings?

There are a lot of secondary (driven) units out there - most fit on a 1", keyed shaft. Team probably makes some of the best.

I'd look on Team's site (http://teamaftermarket.com) and see what is available.

The nice thing is that the majority of clutches are tunable - which is a bit of an art...

11-06-2014, 02:58 PM
I was under the impression you just bought the clutch based on the shaft size. I didn't know it might be proprietary.

11-06-2014, 03:16 PM
The drive clutch may be - don't know this for sure. (so I go do a google search on Predator 420)

Oh, wait! I'm thinking that the Predator 420 is a quad, I did a search and realize that it's an engine.

Sorry 'bout that.

Yea, you should be able to just purchase a drive that fits the shaft.

Commet would probably be the way to go. Hit up rgvkid and see what he has to say about running this setup.

11-06-2014, 03:47 PM
Just to clarify, you're talking about the Predator 420 engine sold by Harbor Freight, correct?

Since it is a generic industrial engine, you can use most clutches that fit on a 1" keyed shaft.

If you're looking at Comet clutches for the Shredder II, you should look at a Comet Duster clutch. It uses a 1 3/16 inch belt (I think). The 30, 40 and 500 series clutches use a 7/8" wide belt and they have a tendency to slip on a buggy the size of the Shredder II. Also, the 30 series clutches are too light-weight for 13 hp. I broke one of their clutches with a 6 hp engine.

The Comet Duster driver clutch is easy to find on Ebay and through other sources, but the driven clutch is sometimes hard to track down. Currently, someone on Ebay is selling a new 90D driven clutch for about $200. That's not a bad price. You also need to procure a belt. I ordered my belt through Scott at Ubuilditplans, as well as the clutches.

Another option is the Comet Salisbury 780 clutch and the Team driver/driven clutches. If you thought the Comet clutches were pricey, then you better sit down before researching the price of a Team clutch setup. They're expensive because they're really good and hold up to some serious horsepower. They may be overkill for your build.

The final option is to purchase an adapter that allows you to run a 30 mm tapered clutch. That allows you to grab a set of used Polaris clutches off of Ebay for your build.

The question of clutches has come up before, so if you search on the site, you should find several threads where everyone has hashed through this issue. Some go with a Polaris clutch setup, some shell out the bucks for a Team setup and others use a Salisbury driver clutch with a driven clutch on a 1" keyed shaft.

Good luck on your buggy.

11-06-2014, 08:15 PM
Texan 77,
I looked at the same motor for my SII kart. If I could make a suggestion, As an option to the Predator 420 I would look at the Lifan 420 from the Home Depot Website. Both are Electric-Start Honda-Clones but for an extra $75 dollars you can get the Lifan with an 18 amp, 12 VDC output charging system. If you plan on running lights, radio, CB, winch or etc on your buggy this will help keep the battery charged. Also, delivery is often free and it comes with a 3 year warranty. I believe you can pay Harbor Freight extra to extend the warranty, but I don't know how much it costs or how long it extends the warranty.

See link below: Not sure if this is going to work. If not a Google search will.

LIFAN 1 in. 15 HP 420 cc OHV Electric Start Horizontal Keyway Shaft Engine with 18 Amp Charger-LF190F-BDQC at The Home Depot (http://www.homedepot.com/p/LIFAN-1-in-15-HP-420-cc-OHV-Electric-Start-Horizontal-Keyway-Shaft-Engine-with-18-Amp-Charger-LF190F-BDQC/203277131?N=5yc1vZbxdkZ543)

11-06-2014, 09:49 PM
Thank you all for the info. I have been searching on here for months but sometimes it's hard to filter through the things you are not familiar with. I already have the harbor freight engine so I doubt I will change that. Thanks again!

11-06-2014, 09:49 PM
I agree with what Darwin said. I researched this topic alot before I ended up finding a whole snowmobile engine for my build. The polaris clutch setup is the cheapest and best way to go, there are many used polaris clutches on ebay. And the secondary clutch fits onto the polaris FNR gearboxes. They are a nice setup for little money when you compare to the comet/team stuff out there. Also the FNR box is a bonus, they can be had on ebay for about $100-$200 bucks depending on year.

11-07-2014, 02:26 AM
Forgive me but what is a FNR box? Forward neutral reverse?

11-07-2014, 03:26 AM
Forgive me but what is a FNR box? Forward neutral reverse?


11-07-2014, 06:00 PM
The final option is to purchase an adapter that allows you to run a 30 mm tapered clutch. That allows you to grab a set of used Polaris clutches off of Ebay for your build.

Have a source for this adapter? I'm planning on using the same engine for my son's two seater kid's buggy next year.

11-07-2014, 08:08 PM
I have used this with a polaris clutch, it fits.
Tapered Clutch Shaft Adapter - 1" (http://www.vegascarts.com/product-p/tsa1.htm)

11-10-2014, 05:34 PM
There are two setups when using the Polaris clutches.

The ATV driver/driven clutches are a smaller diameter than the snowmobile clutches. The ATV driven clutch is a splined shaft, so it typically works best with the ATV FNR transmission. The snowmobile driven clutch, at least on the older Polaris models, uses a 1" keyed shaft.

The driver clutch from a Polaris Trailboss/Trailblazer with the 250/330/335 engine would have a spring and weight setup that would work well with your engine. The Polaris snowmobile clutches are configured for engines with more horsepower, so you would want to swap out the springs and weights with a lighter setup.

Good luck on your build.

11-12-2014, 01:31 AM
Darwin is correct, he has alot of good information on this topic.
I found that you will need a weak spring on the drive clutch, its the black spring. Also on the driven clutch I was told the Red spring. Both are weak, because the RPM of the 4stroke industrial engines is not as high as the Polaris ATV or Sled that it came off of. So a weaker spring gets it to open sooner at the lower RPM's. Perfect for the industrial style engines.

11-24-2014, 03:51 PM
So for a snowmobile clutch I would need an adapter for tapered shaft to straight shaft and for atv clutch an adapter for splined shaft to straight shaft?

11-25-2014, 10:08 AM
No, both clutches are tapered, you need the tapered adapter for either a snowmobile or ATV primary clutch.
Use a Polaris forward/neutral/reverse gearbox from any of the polaris ATV's, the secondary clutch is mounted right to the gearbox and it has a sprocket on it for output. It is an ideal setup for that engine. Then ues the matching polaris primary clutch on the engine.

05-04-2015, 09:51 PM

How is the build coming along?


05-07-2015, 09:30 PM
I'm finishing up a few things and starting to paint. I'll get some pics soon.

05-12-2015, 04:13 AM
Nice, Im thinking about sand blasting mine and re-painting.

Maybe next year:D