Making a Kawasaki Z1 race ready. Again

mark1122 wrote:

turboguzzi wrote: hi arthur

never worked on a 1000 so had no idea about this mod

do you know if the smaller 650-750 block should be similary protected to avoid trouble?

they might be more safe as the plain bering crank has dowels in all the cases bearing housing holes

had on my 750/810 just 4 races this season, so far so good, but would be interested to know if you ever saw similar trouble with 650-750's

tnxs

u may want to run that question by our member, Injected. he dragraces a high compresion, alcohol kz650.

He may know, I have ridden the KZ650s, but never hot-rodded them.

after another sucky day as my Co.tailspins,,,,i read here and know there are higher thoughts,,,,the day erases...rode my 76 to an from work many days now..today was kawi carb guru weather..stars to work...red tail haws to guide me home and am blessed....great thread


touch the hem

yawn

the engine is now apart getting a major freshen up after 2 seasons of flogging....new pistons, valve job, back cut the gear dogs, ck crank for true, etc....the pistons just arrived by UPS today!
excitment in the air.

Arthur,

who makes these super high comp pistons?

TG

the close ratio tranys came already back cut. are u adding more angel to it for some reason?
i sold a brand new 1 to a racer in Florida 2 years ago.

turboguzzi wrote: Arthur,

who makes these super high comp pistons?

TG

Wondering if they are custom made JE Pistons as before...

Wow after seeing what it takes to get one of these motors to 125 hp at the rear wheel, I can smile and laugh at the ones who claim they got anything close, thanks for the post and pics, for all you street riders out there........Forget about it!

dbsuperbiker wrote: the engine is now apart getting a major freshen up after 2 seasons of flogging....new pistons, valve job, back cut the gear dogs, ck crank for true, etc....the pistons just arrived by UPS today!
excitment in the air.

Pictures!!!!!

yes, more JE custom pistons...Back-cut the dogs (again) because I wore them out, rounded off by use.
Keep in mind this is a 1015 motor with 29mm restrictor plate.
Maybe someone else got big HP with big displacement and big carbs....or maybe the have a "special" dyno :whistle:

Have you ever dynoed it without the restrictor plate?

yes, seems it was about 6Hp diff....very measurable, but not earth-shaking. this engine was built to work with the smaller intake.