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Discussion Starter #1
I will be doing a build up of my 03 650 in the next year. The CVT's bearing will get replaced as will the belt. I will be going thru the engine and clutch to "HOTROD" everything. Delta Cams in Tacoma can cut a hotter cam, I will port the head and raise the compression a bit. I am also drawing up a chain belt replacement for the final gear drive. I figure the best Primary Input would be a larger spline 02-04 CVT with the polish adapter mated with the 08 up engine management and OD. Any bearing that can be replaced with ceramic will be.

The plan is to maximize efficiency and power output. I will also add some volume to the gas tank, like 3 to 4 gallons. Maybe bigger rims and tires.

These are things I was told that were a waste of time and money but I went ahead and had a Suzuki GT550 that was faster than most Kawasaki KZ900's and got better mileage than any 2 stroke out at the time.
 

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Sounds like a good project Dave.
 

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Motoman really convinced me that narrowing the intake port is the way to go for higher performance.

In the last issue of Power News, we learned that:

1: When an intake port is too big to provide the velocity necessary to prevent blowback during the Charging phase, the result is a loss of power at all RPM's. The secret to more power
is to make the ports smaller.

2: The intake ports in most modern motorcycles are still
waay too big as they come from the factory !! ...Even for Roadracing use !!


3: Thousands of motorcycles are losing horsepower this winter,
as many tuners will make their intake ports even bigger !!

If this is your first issue of Power News, I recommend that you read last month's edition first:
http://www.mototuneusa.com/think_fast.htm
 

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Erik, I will not make the ports bigger but reshape some of the tight bends and remove obstructions. Normally the pocket just under the valve is real restrictive. The cam's I am talking to Delta Cams are just a bit more duration and lift on the exhaust side.

You should have seen the port job I did on my 79 Mazda RX-7. Fire breathing dragon. With no muffler, when I shifted at 10,000 RPM I got a 5 foot fire ball out the back in all gears but 5th. Porting a rotary is like changing the cam. :thumbup:

I may start looking on Copart.com for a wrecked 08 up for the wiring, ECM, sensors, throttle bodies and what ever else.
 

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Dave,

This sounds like a fabulous project, I'll be reading about you progress in this field with great interest.
 

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Discussion Starter #6
It may take some time. I will be using this engine in a reverse trike. I need to make a bit more power than the 54 from a stock 650. The trike will be about 750 pounds wet, a AN650 is 625 pounds.
 

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This will be an interesting project... I'm with the other posters so far, tentatively watching on...
:thumbup:
 

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My first bike was a GT550 :D I punched it 80 over and had it ported. With a little carb work and a chambered exhaust. That was one fast bike!
 

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Discussion Starter #9
TMMull said:
My first bike was a GT550 :D I punched it 80 over and had it ported. With a little carb work and a chambered exhaust. That was one fast bike!
We bored and ported mine. Shaved the head to bump the compression. Triple expansion chambered long stinger pipe. Made a custom air scoop to direct air to the center cylinder that is normally blocked by the tire. Hotter coils and wires. Only ran on premium fuel. Cafe fairing. Yep, one fast bike for sure. And NOISY. Sounded like three chainsaws on steroids. I was NOT allowed to remove the baffle at the tack as it was over 130 Db wide open. :D Rennn-naaaa-naaaa-naaaa :cheers:


Back to the Burgie, I am talking to a buddy that does propane or compressed natural gas conversions. He thinks we can modify some LP or CNG injectors that the ECM will fire.
 
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