how to raise max RPM's

I agree/ yet disagree, i say one could buy an ebay special for $1000 - 1500, and give a proper spanking to the above mentioned, yet retain most of its reliability due to being close to bone stock.. There are a zx10, and a gs 1100 on there now that could be had for around the cost of a good port ,polish and valve job..

What about the turbo kitted 1400cc big blocks? Are they OK to build because Kawi did not "intend" to build them. Do you post irrational BS on threads about those power plants?

It seems that some folks don't have to much imagination.



Lorcan; running without boost, will the ignition hold till 11,000? Are the valve springs of today any better than those of the mid 80's? Do you think 100 streetable hp can be accomplished on a 650/750 without a turbo?

I certainly do not want to have to pull the head more than once a year (especially for a dropped valve) so if valve springs are a hard limit, I will accept that and smile.

I wish you would accept something..:laugh: The 2 above posts are hard fact you just dont want to accept. build it,rev it, and someone will come along with something they have $1000 - 3500 invested in and spank you proper. Mr.Lorcan has TONS of $$$ and research in his bike. You will never be him.. As far as turbo 1400 cc motors,ive seen them put out nearly 400 hp - big difference between your lil 650 and one of those car tire bikes. :silly:

you can beat it all you guys want,aint gonna get much mileage out of it! :woohoo:

If I were to build a spin monster mid cc bike, I would start with the 750 triple. The valve spring float would not be an issue on the two stroke and they love to rev to the moon.

valve spring technoligy has made leap's and bounds over the last few year's. you can with the right combo definitly make around 100 horsepower for street use and as long as your willing to pull the head fairly frequently to freshen up your valve job and occasionally replace valve springs and valves it will last quite well.the ignition systems will take more rpm than 11,000 so that isn't an issue. with the heavy spring pressures that are needed to keep the valves closed the valves and seat will tend to pound out quickly if your turning big rpm.

::dummy's quote::
I wish you would accept something.. The 2 above posts are hard fact you just dont want to accept. build it,rev it, and someone will come along with something they have $1000 - 3500 invested in and spank you proper. Mr.Lorcan has TONS of $$$ and research in his bike. You will never be him.. As far as turbo 1400 cc motors,ive seen them put out nearly 400 hp - big difference between your lil 650 and one of those car tire bikes.

::/Dummy's quote::





I completely understand that. As i said earlier in the thread if i wanted the fastest thing on the road I would pick up a busa, or zx14.


I want to build my own bike. You don't seem to get that, my money, my time, my bike.... If I can't enjoy my self on a 100hp middle weight bike that spins up fast and high, then will a 180hp mechanical bull of a bike really amuse me?

I know what I want to throw my leg over and I am alright with it not being the fastest.... I just want it to be mine.


BTW, If I drop 2G on the motor I will still have under 4G in the bike, not bad considering that includes 3 spare motors and a zrx rear end waiting a transplant. And it will all be built by me or at least built for me... not some cookie cutter factory ride.

Damn Plummen.....:blink:

Guys, you realize this was a family that died on his front lawn.....:blink: Grandma is somewhere buried near by....

Note to Thyself: Do NOT eat BBQ at Plummens! :blink: :woohoo:

least the saved the prime cuts before the flies got there

TeK9iNe wrote:

Wow, 100+ replies now. :ohmy:

I've read every post here front to back, and there really isn't much that I can contribute that hasn't already been said.

I am however still puzzled by one thing in particular. What's with the obsession with the 650 motor? :huh:

nads.com I'm pretty open minded, and I can understand that for nostalgic, or inherited reasons you might want to restore one. But why make one into a practically non-streetable, b low itself apart, slower that just about everything out there money pit?

Boredom? ... I know you've said for some reasons why, but... Why not just put one of thousands of superior motors in there and just plain have a better bike?

You could just run without a tach, and tell everyone it pulls 15k. :laugh:

Cheers.

timebomb33 wrote:

valve spring technoligy has made leap's and bounds over the last few year's. you can with the right combo definitly make around 100 horsepower for street use and as long as your willing to pull the head fairly frequently to freshen up your valve job and occasionally replace valve springs and valves it will last quite well.the ignition systems will take more rpm than 11,000 so that isn't an issue. with the heavy spring pressures that are needed to keep the valves closed the valves and seat will tend to pound out quickly if your turning big rpm.

Would stainless valves take the abuse longer? Or would they to need to be changed out regularly? APE sells stainless valved for the 1000's the smallest size intake they have is +2mm over the 750 gpz, and the smallest exhaust is the same as the stock 750 gpz. The steam diameter is correct also, I do not know if the length is right however...

What happens to the head when the valve seats get "pounded out" does the head deform? Or is the seat somehow being compressed or ground down?

trianglelaguna wrote:

piston speeds in these first kawi fours bikes was not "the" goal in itself ...rather a usable curve for real world riding and some steady building power was on deck then....the japanese were well aware of rpm's and had ran small cc four stroke gp engines a decade before kz's that reached rpm's not to be soon seen again on a production unit.... if they had intended for a 12000 rpm street kz then one would have been built ...and no offense to the hero's that achieve giant numbers with these old engines....but a 5000 $ c-list bike with some suspension mods and minor engine work will walk on those bikes and be able to run to the store with a passenger or cruise the highways on pump gas....3500 on a good day on e-bat will pay off quicker than a catalog motor and shipped out work..........knock knock

:laugh: :laugh: :laugh: :woohoo: :woohoo: