Making a Kawasaki Z1 race ready. Again

holy crap!!!!!! :woohoo:

thats the kinda pics we need.

is that a head,or a wind funnel :evil: :silly: !

being a two stroke freak i have cut on some pistons.
but that is the first time i have seen the bottoms of four stroke pistons massaged.
i love your piston machining jig,pretty universal.
i currently have a 300ex atv sleeve job that i dropped a new sleeve in last night.the customer supplied his own piston,it looks like they have gone at the top of a new wiseco with a cut off wheel on a die grinder :sick: to enlarge the valve reliefs.
it had me thinking about what kinda set up i would need to re-cut some valve reliefs on my mill.
now that i have seen yours.i believe a version of your fixture could be in my future.

thanks for posting,

leon

COMPRESSION RULEZ! 14.5:1, 112 octane, 32 degrees advance with dual plug head...2 flame fronts lessen required ign advance allowing engine to be cooler and handle the big compression. Other than the .040"-.050" needed to keep piston from hitting the head, there is no compression chamber, it's all piston crown.

dbsuperbiker wrote: COMPRESSION RULEZ! 14.5:1, 112 octane, 32 degrees advance with dual plug head...2 flame fronts lessen required ign advance allowing engine to be cooler and handle the big compression. Other than the .040"-.050" needed to keep piston from hitting the head, there is no compression chamber, it's all piston crown.

yep, seeing those domes i was going to ask: Av-gas or VP fuel? but you beat me too it

we are limited here in italy to 98 octane (euro rating) pump gas, so I run much flatter domes in my 750/810 GPz. also smaller bore so it makes best power with just 28-30 degs on a 1 plug setup. Yes, i know muzzy run dual plugs in the 750 too but they where also pushing it to 14:1 + like you according to their ex tuner.

what's the idea with the heavy rework of the piston's underside? kind of new for me too.

Thanks for sharing

TG

Yeah dude, that is incredible! 14.5:1, that's a basically diesel with fouled valves! :woohoo:

112 octane is leaded, correct?

40mm inlet and 32mm exhaust ports, have you ever had that flow bench tested?

how much clearance do u run for squish? how much would u say is the minimum for a street motor.

OK, I'll spill the beans.
squish is a minimum of .050", or there will be tagging at 10,000rpm.
Cylinders #1&4 run 32 degrees advance, while 2&3 need 30.5 to maintain the same temp as the outers.
There are too many variables, i.e. displacement, fuel and oil choice, cams, purpose of use, etc for me to recommend street compression....maybe 11:1 is almost too much.

here are some more pics....

Nice job on the main support plate. very simple and effective.

what kind of damping valves do u run. how do these forks feel compared to modern forks? do they still dive like the old ones? i put Racetech valving in my cbr6 this year.
How about the brakes, what cals and rotors are they. they must be working well. have u tried a lot of dif pads? can u share any experiences there? i just put some friction Performance pads on my cbr6 track bike.
Thanks for sharing.

Looks like the calipers are AP Racing's CP2696 two-pot version for vintage racing.

www.apracing.com/info/products.asp?produ...P2696-38E0_2536_1085

I'm looking into getting a pair of them for my street bike, I LOVE their look. I'd imagine they perform significantly better than the stock single piston, sliding caliper design.

the forks are '86 ZX10, gutted of the antidive and re-valved. They are stiffer than the orig forks...no more high speed wobble, but require extensive tuning to suit each track and keep the front end from chattering under high cornering speeds.
Vintage rules when bike refurbished allowed for same manufacturer's lower slider fork up to 40mm to be substituted in place of orig.
No, they are not close to modern fork performance...and very hard to tune, but the bike does not wobble

sell me that bike when you are done with it so i can race here???


sell me the bitys to get mine at least headed onto seca?


sell US these pieces and make available a small gusset or frame service?


i will love you for ever....may be even pay top dollar to touch the hem....

is there a back story...from when you started kawi fever and into where you first ran Z' bikes...where you received training in mech/machine/race help along the way....other Z ophiles in your circles....any history of your bike/bikes over the years and as they early loooked and developed......how old are you now and when/where/classes.....did you race...

or is this a one of dream bike and you raced it and won....not likely

i think a story would much much much enjoyed by all here......welcome!!!!...intense.....my dream bike.......

www.americanmotorcyclist.com/events/amav...ace_ready_Again.aspx

maybe these magazine articles will answer some questions...if the type is large enough to read,
and by the way, I am 62 years old.