Thoughts on this 4 stroke engine

[GodMan]

I've been thinking of a second build with a little more torque than my 53cc HuaSheng.

What are everyone's thoughts on this Amazon kit?

 

[cloakedvillain]

Those are big. Really big. Just a big bore predator 79. Works well enough

 

[GodMan]

So what is the difference between the two? Is the one pictured above really 100cc or is it actually 79cc?

 

[Gordy]

So what is the difference between the two? Is the one pictured above really 100cc or is it actually 79cc?

Not sure, no one has ever checked as far as I know. If it is truly a 100cc and has a different head than the 79cc a 79cc predator head would give that thing a crazy boost in compression and power. You can even buy ported heads for the 79cc

 

[GodMan]

Ahhhh. That's unfortunate. I was hoping someone on the forums may have tried this particular engine.

I am torn between the predator 79cc and this one pictured above.

 

[Wrench]

100cc 3.5 hp has a 56mm cyl bore and the 79cc 3 hp has a 52mm cyl bore

The 100cc comes as a M/B kit and a good choice

 

[GodMan]

Is the transmission replaceable on this unit?

I believe the listing states it's a 3HP. That's what makes me question is it really 100cc.

 

[robe]

I have one. Everything looks great but I haven't finished it yet. Looks like it is late summer early winter. I'll have it done for the Christmas riding season .
I'll take a newer picture. I have it much further along.

 

[GodMan]

Nice. Is it everything they advertise it to be?

 

[michael whiteman]

I have a 79cc Predator and a 142f Hausheng. I assume the 156f is just a larger version of the same design. If you already know this allow me, it might be useful to someone in the future. The Hausheng is a high rpm low torq engine, while the Predator is just the opposite. Higher torq with a governor set to 3600rpm. If you have no intention of making the Predator into a hi-performance engine you will need to keep in mind the rpm range when comparing sprocket ratios on the speed chart. The 156f has a 5:1 transmission bolted on it but the Predator will need a CVT (torq converter) or a jack shaft to get the desired ratio. This is the easiest speed chart to use................

Motor and Gear Ratio Guide and Calculator for Vehicles with a Jackshaft - ElectricScooterParts.com

Electric scooter with jackshaft motor and gear ratio guide with gear ratio calculator.

electricscooterparts.com

One other thing you might not know. If the 156f is like my 142f it has a single nylon cam lobe that activates both intake and exhaust valve. I'll never be able to get my head around how this works, but it does. The Predator is designed like a real 4 stroke engine with replacement parts along with many hi performance items also.

I feel the 156F will be easier to install witrhout spending as much money. The Predator is a beter quality engine, but will require a lot more engineering and work, as I am finding out with my current build.