Help with predator 224

[BrownStainRacing]

Damn that thing is nice, I see the burnout marks haha. I might just order a stock piston if I can find one and that head

Man, I'm having NO LUCK finding that ft piston for you.

I've built a ton of these clone engines and always try to keep the clone sizes. Crank pin, cam journals, wrist pin, crank/flywheel taper, the same clone size, that way if something happens to the build or customer wants a different size engine, the billet parts can easily be swapped over.

You could use the stock dished piston and get a 14cc head to bump up the compression ratio.

The 14cc head uses smaller valves (25mm intake, 24mm exhaust) but with that big compression bump, you will never feel the small valves, .

I never used a 14cc head on a 224, but it makes a stock 212 come alive. I'm sure it'll make a 224 hit like a wrecking ball down low.
Getting that hard pull outta the low side, will make you change gear ratio to calm it down.

Here's my son's ducar 212 with a 14cc head. It still has the governor working at 5400 rpm with the stock rod and piston.

It puts thrown together with GPS high dollar parts, slide carbed, ungoverned engines to shame.

 

[aust9002]

This is my little manco got it up to 50mph but that was when the engine would only rev to 5k now it revs to 7+

 

[BrownStainRacing]

This is my little manco got it up to 50mph but that was when the engine would only rev to 5k now it revs to 7+

View attachment 142330

Last week I put a carb, and t/c kit on a customer's 2 seater manco, I think it was a fox or something.
It had a subi 126cc engine on it.

I done went thur that 7k+rpm stage.
It's not worth it, burns up the cylinder, piston, and rings too quick.

Now I keep my builds under 6k rpm, and use compression ratio under 10.5:1, aggressive fast ramped camshafts and bored stock appearing carbs to get that low rpm pull out of em. They live alot longer and much more fun riding then rebuilding, .

They usally got more mph then most want or need for around here.

 

[aust9002]

I know I sound crazy but Im trying to hit 70 xD

 

[aust9002]

This was before i messed up lol

 

[aust9002]

Im going to get some more sanding things for my dremel here in a bit i will try sanding the head and piston down some

 

[BrownStainRacing]

This was before i messed up lol
View attachment 142331

Even in this pic, something was in the combustion chamber.

I looked at you damage pics closer, how does the cylinder look???

Looks like some of the damaged piston is smashed up against the cylinder wall. I hope not, for your sake.

But all the oil on the valves are telling me different.

Dyno Cams has got a non governor Ducar 224 now, it needs a flywheel, but you have one.

Racing Cams and Parts | Ducar 224cc Stock Engine | 224-1000 | DynoCams

Explore a World of Parts: Find the Components You Need for Your Projects. From Mechanical to Electronic, Discover a Vast Selection of High-Quality Parts to Fuel Your Creativity. | 224-1000

www.dynocams.com

 

[aust9002]

I did notice last night while turning it over by hand that there was more oil on the bottom side of the cylinder wall I mightve caught it soon enough to prevent too much damage to the cylinder wall but Im definitely leaning towards buying a new stock piston and hopefully some new rings, anywhere you can find one? The previous dents couldve been from anything but i wasnt really worried because there was only 3 or 4, Ive run it with no filter and no exhaust before on a super dusty road so no tellin.

 

[aust9002]

I think im just going to bite the bullet and buy a new head, piston, rings and whatever else, i have a spare predator 212 hemi layin around that came on the cart but its not running either plus dont have any parts for it because i started buying parts for the 224 because that was my main engine i was going to build

 

[aust9002]

I also swapped the tires to 6ply can am style tires better than the lawnmower tires lol

 

[BrownStainRacing]

I did notice last night while turning it over by hand that there was more oil on the bottom side of the cylinder wall I mightve caught it soon enough to prevent too much damage to the cylinder wall but Im definitely leaning towards buying a new stock piston and hopefully some new rings, anywhere you can find one? The previous dents couldve been from anything but i wasnt really worried because there was only 3 or 4, Ive run it with no filter and no exhaust before on a super dusty road so no tellin.

Pull that piston out, it's gotta come out anyways.

Clean up the cylinder, and have a good look. I'd bet it's toast running without a air filter.

If there is deep scratches, all the pressure that's suppose to be on top of the piston, will be in the crank case from too much blow by, and it'll never hold another side cover gasket, and be way under powered.

You might get away with light honing to clean it up.

I'll look tomorrow and see if I got an old block left, that these guys would run an aftermarket filter on, and the gravel dust would go thur them like a fart thur a g-string.

Yea, they don't run those over priced crap filters no more around here.

I think the scrap metal guy got 10-12 bad blocks from me last time he was here, jus from running bad air filters.

Good luck with your build, you should find that stock piston and ring kit from Dyno Cams, EC Carbs, and anybody else that deals with the Predator 224.

 

[aust9002]

Pull that piston out, it's gotta come out anyways.

Clean up the cylinder, and have a good look. I'd bet it's toast running without a air filter.

If there is deep scratches, all the pressure that's suppose to be on top of the piston, will be in the crank case from too much blow by, and it'll never hold another side cover gasket, and be way under powered.

You might get away with light honing to clean it up.

I'll look tomorrow and see if I got an old block left, that these guys would run an aftermarket filter on, and the gravel dust would go thur them like a fart thur a g-string.

Yea, they don't run those over priced crap filters no more around here.

I think the scrap metal guy got 10-12 bad blocks from me last time he was here, jus from running bad air filters.

Good luck with your build, you should find that stock piston and ring kit from Dyno Cams, EC Carbs, and anybody else that deals with the Predator 224.

This is the filter im running right now so i shouldnt have to worry about that anymore

 

[aust9002]

Honestly I think I might get these 2 it should come with everything I need plus I wouldnt have to lap any valves or anything that I have no experience doing lol, let me know what you think i looked on that link you sent me and i couldnt find just a stock piston

 

[Denny]

Don’t overthink it or over do it. You only need to knock off the high spots of the craters.

 

[aust9002]

Don’t overthink it or over do it. You only need to knock off the high spots of the craters.

I think im going to try it but im going to probably order those so they get here just incase just worried now about cylinder wall and rings

 

[aust9002]

Ok so I think im going to buy these hopefully it will be a simple swap and can get me back up and running while I fiddle with the piston and other head, gets me to a flat top, with a .709 wristpin and made for the 58mm stroke, the arc 6271 billet rod, and the tilly 225rs head it comes with the 26lb valve sprimgs already installed too so I dont have to swap anything from the head and plus it has empty exhaust bolt holes so that would fix that too,

 

[aust9002]

Or i could spend that same amount and get a new motor and swap everything over... hmmmm decisions decisions

 

[BrownStainRacing]

Or i could spend that same amount and get a new motor and swap everything over... hmmmm decisions decisions

Racing Cams and Parts | Ducar 224cc Stock Engine | 224-1000 | DynoCams

Explore a World of Parts: Find the Components You Need for Your Projects. From Mechanical to Electronic, Discover a Vast Selection of High-Quality Parts to Fuel Your Creativity. | 224-1000

www.dynocams.com

 

[BrownStainRacing]

This is my little manco got it up to 50mph but that was when the engine would only rev to 5k now it revs to 7+

View attachment 142330

This one is like yours.
Looks like somebody changed the front tires and wheels. Buts it's good enough for 10-12 yr old fellas to have fun on.

They suppose to pick it up this weekend.

 

[aust9002]

Dang but then i still have a stock piston, would my flywheel swap over?