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Making a Kawasaki Z1 race ready. Again 26 Nov 2011 23:46 #490282

  • DoubleDub
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Thanks for posting the article! B)

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Making a Kawasaki Z1 race ready. Again 26 Nov 2011 23:46 #490283

  • Racecrafters
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Welcome! Now we're getting into to the zone! Giant ports? What's the engine displacement, carb size?
1978 KZ1000 Superbike
1978 KZ1000 Stock
1976 KZ900 Racecrafters replica
1982 GPZ 750
2000 Ducati 748
1978 Suzuki GS1000E Yosh replica

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 00:29 #490286

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Racecrafters wrote: Welcome! Now we're getting into to the zone! Giant ports? What's the engine displacement, carb size?


From the article:
Valves are 39mm intake/32mm exhaust
Pistons are 70mm (1015cc minus compression space consumed at 14.5:1).
Carbs are Mikuni VM33's with 29mm restrictor plates.

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 03:19 #490294

  • dbsuperbiker
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DoubleDub wrote:

mark1122 wrote: Nice job on the main support plate. very simple and effective. B


Another novice question, what is the failure/flaw the main support plate upgrade is there to help with?

Engine cases crack after about 6 races. High stress from 125+RWHP and abusive riding cause the cases to flex, then crack. The gusset system ties together the center main bearing support, the upper engine case and lower case. In the middle of the engine, the 2 engine cases are independent on the stocker. After this mod...zero engine case failures after 3 seasons :)
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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 09:40 #490312

  • mark1122
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how do u get in there to drill the case supports?
i have seen some pretty elaborate suports in there.


Attachment main_cap_support1_small.jpg not found




heres another

Underneath the plate you see, there's a block of billet aluminum that extends down to crank cap which bolts on to the four inner studs. This piece ties the cap and upper case with the lower case. The plate on top ties the billet piece to the lower case. There is also a shim kit in between the plate and billet piece that can be used to adjust to the variance between sets of cases (i.e. the unit can be transferred from one set of cases to another if need be).


Attachment crankcapsupportsmall.jpg not found

76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

~ ~ ~_@
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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 11:25 #490323

  • Old Man Rock
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"how do u get in there to drill the case supports? "....
Well it sure as hell wasn't accomplished with Harbor Freight tools.... :pinch: :laugh:

Damn I just LUV these images of you guys that can do this type of work, coolness at it best.
RSling, Leon, Irishwill, Testarossa etc.... B)

Keep them images coming no doubt... :)
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 12:44 #490327

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u mean i cant use my grinder and Drumel ? :angry: :laugh:
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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~ (k) / (z)

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 13:46 #490336

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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

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 14:29 #490343

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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.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, 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 27 Nov 2011 15:23 #490363

  • mtbspeedfreak
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I've never seen the cases braced like that before, it makes sense to me! I'm slowly accumulating the stuff I need for a "go-fast" Z1, those are a great few pics to save for future reference.

Mark, the "block of billet aluminum" with the shims, where'd you find that? I'm definitely interested in hearing more about it if you can provide any more details.
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 27 Nov 2011 16:27 #490372

  • DoubleDub
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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


Also interested, although I won't be making nearly that amount of power :unsure:

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 17:09 #490380

  • mark1122
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its not needed on the street. the 1 thing u need to watch out for though, is the output shaft. when u put a 5/8" or longer offset sprocket on and head to the drag strip.u should use a suport bearing and plate in that case.
unless u are using a big tire. or hammering it on every corner of a rd race track u will be fine with out case bracing. most drag bikes with small tires live a long life without bracing.the tire spins up and takes the load off.
i and many others run kz1200's on the street without.

i think Arthur has the right idea.quick and simple. if u can do it without alot of machining and expence it makes more sence.in his case , he has found it to be very nessasary.

the problem is the braces(case webbing) are not flat, they are thicker at 1 end than the other, so most fixes ive seen, involve machining them flat first, so they are 90* to the main cap.

the guy the made the second one , made a few, and there was no demand so he stopped. i can put u in touch with the guys though if u want to order 1 up. but since they are 1 off, u may fair better localy? they build top fuel bikes, and hange at dragbikes.com
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, ZRX12 rear end, and seat,96zx9 front end.
01 CBR600F4i Track bike.
Cobourg, Ont. Can.

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~ (k) / (z)

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Making a Kawasaki Z1 race ready. Again 27 Nov 2011 19:35 #490405

  • dbsuperbiker
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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.

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Making a Kawasaki Z1 race ready. Again 29 Nov 2011 21:45 #490729

  • trianglelaguna
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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
1976 KZ900
2003 ZX12R
2007 FZ1000
2004 ninja 250R for wife

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Making a Kawasaki Z1 race ready. Again 30 Nov 2011 21:51 #490879

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yawn
1976 KZ900
2003 ZX12R
2007 FZ1000
2004 ninja 250R for wife

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Making a Kawasaki Z1 race ready. Again 01 Dec 2011 00:44 #490909

  • dbsuperbiker
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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.

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Making a Kawasaki Z1 race ready. Again 01 Dec 2011 09:24 #490945

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Arthur,

who makes these super high comp pistons?

TG

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Making a Kawasaki Z1 race ready. Again 01 Dec 2011 10:27 #490952

  • mark1122
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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.
76 KZ, frame gusset work,1200CC.Ported by Larry Cavanaugh, 1.5mm.over intakes, Carron Pipe, 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 01 Dec 2011 11:38 #490956

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turboguzzi wrote: Arthur,

who makes these super high comp pistons?

TG


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

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Making a Kawasaki Z1 race ready. Again 01 Dec 2011 12:23 #490961

  • lemo32
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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! B)
1979 kz 1000 06 katana 750

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