engine size

[masternate]

Would a 750 bike engine be enough for an st3? I'm starting to plan ahead before i begin building anything. I just don't want to build a cool looking buggy that ends up being a turd in performance land.


Thanks.

[ErwinBnl]

Hey!

Have you done some research?

Giorgos has build a ST3 also, with a quite old 750cc engine! It works great as you can see on his movies.

His topic is in this same group, look it up and read it.

http://www.minibuggy.net/forum/st3/17598-gvouvakos-st3-build-9.html#post248218

Good luck!
Erwin

[masternate]

I do remember seeing that build. I must have forgotten what size of motor he had used.

[gvouvakos]

hello

I have used an old 750cc yamaha engine, and with the right gearing the acceleration is great and i can reach 80 mph

However a newer fuel injected engine 750 cc would kick ass on the st3

[cdnjaguar]

What horsepower was that 750? Thinking of using a raptor 660 or 700

[K-fab]

What horsepower was that 750? Thinking of using a raptor 660 or 700A four cylinder 750 should easily make 130-140 hp.

The Raptor's making 40ish - there's a recent post with a dyno sheet on the 700's output.

[cdnjaguar]

Oh it's a 4cyl. Starting to thing a raptor engine may not be enough... How would you rug up a reverse gear if one went with a 750 cc 4 cyl?

[K-fab]

There are a few options for reverse. The RPM trans is the best, but it's on the pricy side. You can also do the starter/ring gear setup. There are a few guys here running them. I think Glock has it, Yoshi did it, search or wait for someone to pop up and post. Did Mr Bracket have that setup?

[JMperformance]

Would a 2001 gsxr 600 fuel injection motor be powerful enough on a st3?:confused:

[odypilots]

It depends on what you do with it, but a safe bet is no. Many replace 600s with more power.

[Kuma]

If you are running trails and dirt roads then 750 has plenty of power if you are planning to play in the sand then more is better.

[LIDUNO]

With the Raptor 700 making about the same amount of torque, but at a much lower RPM make it usable though? Comes with it's own reverse.

I was in the middle of building a 2 seater fl350 Honda Odyssey with a raptor 660 motor, when I had a chainsaw accident and had to sell it.

[JMperformance]

Sorry about that. Hope you are ok! did you ever get to drive the buggy? if so was it enough power for the one seater?

[LIDUNO]

Sorry about that. Hope you are ok! did you ever get to drive the buggy? if so was it enough power for the one seater?Started the project with a crashed Raptor and an fl350 rolling chassis, never got to drive either.

[JagerDanger]

If you gear it it deep, it'll work. The website says a minimum of a 600cc engine, but recommends larger. Sport bike engines need to be revved up and not lugging it. So gearing will help a lot. A larger engine will just help get you going and keep you going in challenging terrain.

[JMperformance]

Would a 60 tooth rear sprocket and the stock motor sprocket on the engine be a good gear ratio for the 100hp and 1000lbs?