Predator 670cc 22hp

[Neverdone]

Has anyone used one of these on a kart build yet? I am thinking about the go big or go home scenario for my wife's Polaris that I am building up. Not sure if it would be worth it to run one of those verses the 420cc. 33ftlbs of torque vs 18ftlbs. Only weighs 30lbs more by shipping weight. Would sound pretty sweet. Remote oil cooler and such might be nice. About double the price though.

Any thoughts?

 

[KartFab]

I heard that the engines have a high idle out of the box, and may need to have the valve lash adjusted. Other than that, I don't think they have any issues that I am aware of. I have seriously considered getting one of these after my fiasco of buying a used honda gx620.....

Anyway, they are definitely cheap and powerful. Lots of torque means lots of stress on stuff that may wear out sooner. So just think of the weak points like sprockets, chain etc...

This is all theoretical, but I was thinking about running dual 420 pitch chain to dual sprockets for the build I have in mind, or going with some reduction and using heavier duty chain and a heavy duty sprocket, because lets face it.... this is a lot of torque for a go kart. The transmission that i am goign to use for mine is a 40 series, which is only rated for up to 18 horsepower so yeah its just too much but I figure what the heck, why not.

the 420cc is great though, and shouldnt require any serious modifications.

Might want to hop over to a mini buggy website as this is something that those guys might stick on there.

 

[Neverdone]

I was just talking to a guy and he brought up the point of do I really need that much power? And there are a lot of good cheap mods on the 420..... But man.... That vtwin could be sweet and power on tap!

Sent from my DROID RAZR HD using Tapatalk

 

[mckutzy]

When your getting up in that territory, you might aswell get a motorcycle engine. Typically that'll have a transmission already.

 

[Neverdone]

Problem is my wife doesn't want to use a clutch and shift. Otherwise I would be looking at a lot of other options. The trans I am going to run is just to get reverse. High and low is a bonus.

Sent from my DROID RAZR HD using Tapatalk

 

[OzFab]

When your getting up in that territory, you might aswell get a motorcycle engine. Typically that'll have a transmission already.

True but, in many ways, an industrial engine is so much easier to work with...

The trans I am going to run is just to get reverse. High and low is a bonus.

What trans would that be?

 

[Denny]

I have one sitting in my living room waiting for me to get the time to start on my project. I say go for it!

Denny

 

[landuse]

Problem is my wife doesn't want to use a clutch and shift. Otherwise I would be looking at a lot of other options. The trans I am going to run is just to get reverse. High and low is a bonus.

Sent from my DROID RAZR HD using Tapatalk

I know comet has a reverse gearbox, but it is not rated for the HP that your engine will put out

 

[Neverdone]

What trans would that be?

I picked up a Polaris 350l trans. It is a gear driven unit with a 3.3:1 high range and a 6.6:1 low range and I think a 5.3:1 reverse. Comes complete with neutral and reverse indicators and a hydraulic brake with brake light switch. This runs a 520 chain which I already have a sprocket for to go on the axle left over from when I built my yz125 barstool racer. This all together will make my final drive in high a 5.83:1 compared to the 6:1 currently installed on the kart. I think that it will be a good addition. I am sure that it would be fine on that 22HP motor which is why I was considering it.

 

[commonrail]

I don't think I've ever heard one of the V-twins with true dual exhaust. Most just run two into one. I say go true duals with some throaty little mufflers!