Displacement / horse power increase - swappable parts

[raul10141964]

2001 gz250 1981 Gn250
power 20.00 HP @ 8000 RPM 22 hp @ 8500 rpm
Torque 19.00 Nm 14.0 ft.lbs @ 7000 RPM 19 Nm @ 6500 rpm
Compression Ratio 9:1 8.9:1
Carburetor MIKUNI BS34SS 34mm MIKUNI BS32SS 32mm

Bigger carb = 2HP+

[mainlinecoffee]

If it's not too late to revive this thread,has anyone tried a adjustable cam plate or a cdi with a higher redline? Hell for 3k you could bolt on a turbo..

[Water Warrior 2]

Originally Posted by mainlinecoffee

If it's not too late to revive this thread,has anyone tried a adjustable cam plate or a cdi with a higher redline? Hell for 3k you could bolt on a turbo..

For 3K you might be able to buy an old Honda Turbo 650 that was purpose built. If you think you need a turbo you have the wrong bike. The GZ is just what it is and a bunch of cash thrown at it won't change that.
A higher red line will just make the engine explode sooner.
You might enjoy the Ninja 250 though. It has a much higher red line and more power overall.

[mainlinecoffee]

If I need a Adrenaline fix I hop on my chopped goldwing,personally I think the meager 22hp is more than enough for the job but I love wondering what if, costs too damn much to find out the hard way.

[Water Warrior 2]

Originally Posted by mainlinecoffee

If I need a Adrenaline fix I hop on my chopped goldwing,personally I think the meager 22hp is more than enough for the job but I love wondering what if, costs too damn much to find out the hard way.

I will find out the hard way with my new to me Money Pit used 1983 Honda 650. I can see an easy $1000 going into it with just repairs and maintenance to begin with. Yup, that sounds dumb but at least I will have a bike sometime this summer that is safe to ride and everything working as it should.

[mainlinecoffee]

The 83 was the first real motorcycle I have ever owned,gave a guy a shotgun and fifty bucks to drag it out of a barn, my friends laughed at me when they saw it,dead snake behind the headlight and meow mix in the airbox, everything broke rusty or covered in mouse shit...I don't think you will be disappointed, the cb650 is a wonderful machine. If you ever need any help or just a different perspective give me a shout,I know that machine better than my own body.

[Water Warrior 2]

Originally Posted by mainlinecoffee

The 83 was the first real motorcycle I have ever owned,gave a guy a shotgun and fifty bucks to drag it out of a barn, my friends laughed at me when they saw it,dead snake behind the headlight and meow mix in the airbox, everything broke rusty or covered in mouse shit...I don't think you will be disappointed, the cb650 is a wonderful machine. If you ever need any help or just a different perspective give me a shout,I know that machine better than my own body.

My bad. Should have specified GL 650. The Half Wing thing.

[mainlinecoffee]

Gl looks awesome but I have no earthly idea about what makes them tic,I am supposed to rebuild the water pump on my gl1200 next week but I burned up the clutch in my truck yesterday so it may take priority. I always thought the 650 would be beyond badass in a Amin frame with the front end raked to hell.

[JohnC]

Originally Posted by raul10141964

2001 gz250 1981 Gn250
power 20.00 HP @ 8000 RPM 22 hp @ 8500 rpm

Carburetor MIKUNI BS34SS 34mm MIKUNI BS32SS 32mm

Bigger carb = 2HP+

But... It looks like the bigger carb goes on the lower hp engine...

Compression Ratio 9:1 8.9:1

Again, looks like the higher compression ratio is coupled with the lower output. Backwards?

Bottom line, if you're going to turn the engine faster you'll need a bigger carb as you're pulling in more air per second. Raising the compression ratio or increasing the RPM can both increase output.

[mainlinecoffee]

To rase compression couldn't you just shave a bit off the head?