Advice on Hammer Head 200 Engine replacement

[Karttekk]

Zade, you'll need to find out if your kart has external reverse or internal if you were going to replace the engine with another GY6. . Look on the shifter. Does it have FNR or FR? FNR means you have internal reverse. Keep in mind right now (if the engine was running), you would have electric start and reverse plus working disc brakes. That will all go away with the 420 engine. You'll need to figure out where to put the disc brake rotor and mount the caliper. You'll need to push a huge machine around without reverse if you can't get reverse working on the 420. There's a lot to think about, just trying to point out what you could run into. The Hammerhead Performance engines aren't cheap, check Facebook Marketplace just for the heck of it. Use the 420 engine on your next go kart build, it will work out much better in my view. These links show the difference between the two types.

Hammerhead Polaris 150cc Engine Assembly with Internal Reverse and Oil-Cooler Holes for 150cc, GY6 - 006-JL150-03 replaces 006-JL150-02, 15332, 006-H1200011

006-JL150-03, 15332, 150cc IR (F/N/R) 150cc Engine with Oil Cooler Holes

hammerheadperformance.com

Hammerhead 150cc Engine with External Reverse (F/R Only - No Neutral) for GY6, 150cc - 2.000.009

2.000.009, ENGINE. 150cc (external reverse) (no neutral postion...forward/reverse ONLY)

hammerheadperformance.com

 

[Denny]

This should be a breeze. May be 1 weekend. Should be no big deal pushing the kart backwards. Or adding a FNR box. He’ll still be out less money, time and hassle.

 

[Karttekk]

This should be a breeze. May be 1 weekend. Should be no big deal pushing the kart backwards. Or adding a FNR box. He’ll still be out less money, time and hassle.

I've repaired and sold 3 or 4 of these, pushing a 400 lb. or more machine around is no fun, especially on a grade. Are you at all familiar with these machines?

 

[Karttekk]

Swap out in one day, complete engine. No fabrication, no swearing, no hours on the phone with someone. Your call.

150CC GY6 150 ATV GO-KART ENGINE MOTOR BUILT-IN REVERSE

 

[Snaker]

I've repaired and sold 3 or 4 of these, pushing a 400 lb. or more machine around is no fun, especially on a grade. Are you at all familiar with these machines?

You got a point there. They are bigger than a go cart and with the solid rear axle and big rear tires, do not like to roll if the steering is turned at all.
And there is also some portion of the gearbox spinning as well.
I did push mine around at times, mostly to hookup trailers, but that was somewhat infrequent.

I remember when I got my YS200 from Menards.
They allowed a test drive in a back corner of the paved parking lot.
A small area without much of any straights.
The thing would really struggle starting out with the steering turned, a real turd.
I thought about it and tried it again making a point to start out going straight and getting onto a area of dirt on the side.
Was like a night and day difference.

 

[Snaker]

Swap out in one day, complete engine. No fabrication, no swearing, no hours on the phone with someone. Your call.

150CC GY6 150 ATV GO-KART ENGINE MOTOR BUILT-IN REVERSE

That powerplant is really bazaar. A kickstart and a direct shifter.
Amazing how they switch the makeups around.
Mine has no kickstart but the CVT cover was cast for the feature, just not machined for it.
Although the crankshaft CVT drive pulley has a spacer with the sawtooth design made for a kickstart.

Other parts of the cases have casting shapes meant for scooters but not used for the carts,
even though the case includes the f/n/r gearbox, which a scooter doesn't use.

 

[Karttekk]

Thanks Snaker. I'm only trying to point out what he could run into. I've rebuilt the top ends on these engines, changed sprockets, changed clutches and belts. These things are beasts. Moving them around in my garage is a nightmare, imagine pushing one up a hill. I've seen it time and again, people jump into converting the engines to go kart engines and end up walking away. It might work out fine for him. If so, great. I would give it some serious thought before I committed to it though.

 

[Karttekk]

This is from an American Sportworks 150cc buggy repair manual.

 

[Denny]

Neither one of you guys ever rode snowmobiles did you? My Wildcat weighed over 700 lbs. Many times on many occasions I I had the pleasure of dragging it backwards. On concrete, snow, asphalt, gravel, wood and steel plate. Let’s just say it was like dragging an anchor. So butch up boys.

 

[Karttekk]

Neither one of you guys ever rode snowmobiles did you? My Wildcat weighed over 700 lbs. Many times on many occasions I I had the pleasure of dragging it backwards. On concrete, snow, asphalt, gravel, wood and steel plate. Let’s just say it was like dragging an anchor. So butch up boys.

I ran a lawn service for 10 years. Owned a Snapper walk behind commercial mower that easily weighed that much if not more. Have you ever had to pull one of those anywhere in 90 degree heat? That's "butching up." Try it sometime.

 

[Denny]

I did! When I helped my buddy mow a cemetery. The machine I was using threw a rod on the ancient mower I was using. Had to drag it back about 1/8 th mile back to the garage. Still easier than dragging a sled backwards. Why are we even discussing this? The op has already made up his mind.

 

[Snaker]

I did! When I helped my buddy mow a cemetery. The machine I was using threw a rod on the ancient mower I was using. Had to drag it back about 1/8 th mile back to the garage. Still easier than dragging a sled backwards. Why are we even discussing this? The op has already made up his mind.

Why are we discussing this? really? What the hell are you gibber jabbering about? Snowmobiles? I don't know why your discussing that. For myself, I had a sled full of them, from 70's models to 2000's. And I went through more with snowmobiles than you ever thought of. But again, why are you discussing that?

 

[Denny]

Your right, your so cool!

 

[Karttekk]

I may be wrong and probably am but I think he'll end up getting buried (no cemetery pun intended Denny) with this project. Hopefully he'll do fine, I just think it's too much for a "newbie." Until he gets a few builds under his belt my suggestion is to do a swap with the same engine. Then again, jump in there and see what happens!

 

[panchothedog]

DRAGGING THE KILLER KARTS AROUND.
I own 5 karts. Every one of them is a large ( 60" to 68" wheelbase ) two seater
full roll cage live axle large tire. They are all powered by predators or similar style clone engines. None of them have a reverse gear. I tow up three at a time
with my truck full of grandkids out to the desert for riding adventures being the only adult in the party. I am 74 years old. I am not going to try and tell you that
I have never had to HUF and PUF a little but honestly it was pushing a disabled 280 lb to 400 lb kart forward back onto the trailer. Lack of reverse if ever has hardly been a problem. If it gets stuck in a okward position you pick up the front axle and rotate it 180 degrees.

 

[Karttekk]

Buggy style karts and large go karts are completely different animals. Without reverse on a huge buggy you likely won't be able to lift the front end up and rotate it. I don't think reverse is needed on a go kart either, we're talking about 500 lb. huge Chinese buggy type machines.

 

[Zade]

It will certainly be a learning experience for him, no doubt. Not trying to discourage him, sometimes projects like this become overwhelming. Looking forward to the results!

Team,
I’ve removed the original engine and it’s on the bench.
Question:
The gear box with sprocket. It is proprietary to this engine?

I see some decently priced Gy6’s out there but none seem to come with the best box.

I’m not opposed to rebuilding this 07 that came stock. Here are some snaps.


thanks all.
PS I’ve not ruled out at all the industrial 420 I e got here .

just looking at all options and advice.

 

[Zade]

I meant to type beer box not best box….

 

[Karttekk]

What exactly is wrong with that engine? No compression? Spun bearings? You may only need a top end rebuild. Is the piston or cylinder scored? I would find out what's wrong with what you have. A top end rebuild isn't all that involved. Report back with the engine problem so we can give you better advice.

 

[Karttekk]

Here's complete GY6 engine of some flavor. Maybe try them?

GY6 Engine (Long Case, Short Block) Replacement Parts

This GY6 150cc long case short block is the perfect starting point to building that monster engine you have been bragging to all your friends about.

www.scooterworks.com