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TOPIC: Making a Kawasaki Z1 race ready. Again

Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489635

  • mtbspeedfreak
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Can you start with pictures? B)
2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489696

  • turboguzzi
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dbsuperbiker wrote:
the details in this Z1 are too many to just start spewing...what are y'all interested in?

Answer to porting question...giant ports and giant valves (for an old style Z1 head), 40mm inlet and 32mm exhaust. The inlet ports are so big that a few places needed JB Weld to cover the gaps to the atmosphere.

As far as assaulting Daytona, I won there in 2010 :)

nice, that's a good start.....

how much compression are you running? (and whith which gas), how much ignition advance? cams? your approach to building squish (fit close to the dome or bathtub approach) we are all ears :)

TG
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489737

  • mark1122
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Congrats to your win at Daytona.
those are some pretty big valves. what size cr carbs are u feeding them with?
she must like to rev. are u useing a close ratio trany to keep the revs up ?
76 kZ, frame gusset work,1200CC.Ported by Larry Cavanaugh,This email address is being protected from spambots. You need JavaScript enabled to view it., 1.5mm.over intakes,.ZRX12 rear end,and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg,Ont.Can.

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Last Edit: 2 years 10 months ago by mark1122.
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489772

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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489827

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
skiatook,oklahoma 1980 z1r,1978 kz 1000 z1r x 3,
1976 kz 900 x 3
i make what i can,and save the rest!

billybiltit.blogspot.com/

www.kzrider.com/forum/5-chassis/325862-triple-tree-custom-work

kzrider.com/forum/5-chassis/294594-frame-bracing?limitstart=0
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489853

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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.
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489856

  • turboguzzi
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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
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489864

  • mtbspeedfreak
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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?
2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489868

  • mark1122
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how much clearance do u run for squish? how much would u say is the minimum for a street motor.
76 kZ, frame gusset work,1200CC.Ported by Larry Cavanaugh,This email address is being protected from spambots. You need JavaScript enabled to view it., 1.5mm.over intakes,.ZRX12 rear end,and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg,Ont.Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489892

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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....




Last Edit: 2 years 10 months ago by dbsuperbiker.
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #489977

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

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.
:)
76 kZ, frame gusset work,1200CC.Ported by Larry Cavanaugh,This email address is being protected from spambots. You need JavaScript enabled to view it., 1.5mm.over intakes,.ZRX12 rear end,and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg,Ont.Can.

~ ~ ~_@
~ ~ _- \,
~ (k) / (z)
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490008

  • mtbspeedfreak
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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.
2000 ZRX 1100
1976 KZ 900- Daily Driver
1980 LTD 550- Dalton Highway survivor!

If it has tits or tires, it'll give you problems!
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490038

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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
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490042

  • trianglelaguna
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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.......
1976 KZ900 A4 38 years and counting
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490044

  • peter1958
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74z1 75z1 76-900 78-1000 78ltd-1000 80 z1classic 81 kz1300 83 elr 84gpz1100 a bigger carburetor with a restrictor plate flows more than a carb the size of the restrictor plate
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490045

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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.

Last Edit: 2 years 10 months ago by dbsuperbiker.
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490046

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here is some memorabilia...enjoy!
the first ever Superbike race;



in some fast company, look at the several eventual world champions on factory bikes;



and a photo from the starting tower of that 1982 AMA race, match the riders to their bike number;
Last Edit: 2 years 10 months ago by dbsuperbiker.
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. 2 years 10 months ago #490047

  • KZ250LTD
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.
79 KZ1000ST
Past:
Many.
Last Edit: 2 years 8 months ago by KZ250LTD.
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490049

  • trianglelaguna
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wow....mad respect

i cant read em though they claim deleted or moved to ph bckt ect.....

how did manage to stay in one piece...even good Z's crash some....unreal...go faster yet still too....unreal times...just sick....wow
1976 KZ900 A4 38 years and counting
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Making a Kawasaki Z1 race ready. Again 2 years 10 months ago #490069

  • DoubleDub
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I was under the impression that a boxed swing arm wouldn't be allowed on a Kz in the AHRMA.
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