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Author: Subject: 1/4 mile times..z1-kz1000
kzz1
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[*] posted on 21-8-2005 at 07:08
1/4 mile times..z1-kz1000



Best 1/4 mile times with a stock bore stock pistons with stock carbs aftermarket pipe on a z1 and kz 1000?
Best i've done with my 74 z1 bored to a 1015 cc stock kz 1000 pistons 28mm carbs, Starcycle Racing 4 into 1, 3" over stock arm, 14 tooth countershaft sprocket from 15, stock 35 tooth rear sprocket, 11.70@112mph:( 1.70 60' on a skinny 18" rear street tire. Anyone done better with the same engine mods. I'm curious to see if i'm close. I know I need to work on the 60' but it is hard to improve on when I am already leaving at 8000 rpm:o




1974 Z1 A, 1988 Yamaha YSR 50, 2000 Suzuki Hayabusa GSX 1300R
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Z-doctor
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[*] posted on 21-8-2005 at 07:43


I think you have a very good ET for that set up,but the speed should be better,considering the 11:70.Perhaps some plug checks,or jetting might get it even better.



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bob_z1
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[*] posted on 21-8-2005 at 14:32


I have one of my last time tickets here somewhere from York US30 Dragway.
It's from back in the 70's, 12.39 on my '75 Z-1 with a 4-1 Yosh pipe.
Of course I was a lot lighter then :D




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donthekawguy
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[*] posted on 21-8-2005 at 15:55


The best I got outta my 75 900 all stock was 12.75 back in 86. Man I miss that bike!



78 kz1000, accel coils, dyna ign.,WG carbs,4-1,pods,powdercoat engine covers, zx6 muffler, mac header. braided lines, powdercoated calipers, fresh paint, corbin seat, dual headlights, cateye tailight, lowered 2 inches, rebuilt forks...
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kzz1
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[*] posted on 21-8-2005 at 17:30


I know there is more racers here?



1974 Z1 A, 1988 Yamaha YSR 50, 2000 Suzuki Hayabusa GSX 1300R
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dnyce
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[*] posted on 22-8-2005 at 03:02


12.60 @ 104, 1.9 60ft, 15 tooth and 35 tooth sprockets, stock motor, stock swingarm cheap 16" cheng shin tire. after makeover im shooting for 9.90's

[Edited on 22-8-2005 by dnyce]




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Z-doctor
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[*] posted on 22-8-2005 at 03:21


Stock 74-900;Kerker with comp baffle,jetting,K&N,14-35,=12:01 @110 mph,like clockwork.



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kzz1
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[*] posted on 22-8-2005 at 03:59


[quote][i]Originally posted by Z-doctor[/i]
Stock 74-900;Kerker with comp baffle,jetting,K&N,14-35,=12:01 @110 mph,like clockwork. [/quote]
So mine being a 1015cc stock piston, the mph is about right with 117.5 main jets on a 28mm carbs. It appeared that the plugs had a tint of brown on them and I didn't have any 115 mains to try but I think that might be a little lean if I tried them?




1974 Z1 A, 1988 Yamaha YSR 50, 2000 Suzuki Hayabusa GSX 1300R
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Lorcan
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[*] posted on 22-8-2005 at 12:25


12.5 on my old Z1000J, but it did only have 120psi compression and burned a pint of oil every 100 miles. It was no quicker than my 650!

11.7 seems fine to me.




196hp 185mph 1984 ZX750E1 turbo.

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Jeff.Saunders
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[*] posted on 22-8-2005 at 18:16


11.3 @ 120 on my old Z1 on a greasy Santa Pod 1/4 mile strip in England.

1015cc Action Fours 10.5:1 pistons
0.410" lift Action Fours Cams
29mm Smoothbores
Straight through 4-1 exhaust
Stock swingarm, 4.50" Avon Roadrunner Rear Tire)
KZ650 Shocks
Lightened a fair amount - no starter, no center stand, no turn signals or grab rail, fiberglass rear fender, and very empty pockets...

...and looking very much like the avatar...

...oh, and back then I only weighed about 158lbs

[Edited on 23-8-2005 by Jeff.Saunders]




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2 x 73 Z1's (one turbo'd), 1 x 74, 1 x 76 KZ900, some Honda's (CB750's and CB550), a Suzuki GS750
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rivman15
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[*] posted on 22-8-2005 at 19:25


Jeff, can I try that on your turbo? Please???? I promise to not burn up that back tire to much!!:D:D Riv (Joe)



1975 Z1 Pro street dragbike
1977 KZ 1000
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kzz1
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[*] posted on 22-8-2005 at 20:12


[quote][i]Originally posted by Jeff.Saunders[/i]
11.3 @ 120 on my old Z1 on a greasy Santa Pod 1/4 mile strip in England.

1015cc Action Fours 10.5:1 pistons
0.410" lift Action Fours Cams
29mm Smoothbores
Straight through 4-1 exhaust
Stock swingarm, 4.50" Avon Roadrunner Rear Tire)
KZ650 Shocks
Lightened a fair amount - no starter, no center stand, no turn signals or grab rail, fiberglass rear fender, and very empty pockets...

...and looking very much like the avatar...

...oh, and back then I only weighed about 158lbs

[Edited on 23-8-2005 by Jeff.Saunders] [/quote]

What kind of times before the major mods? Just trying to see if the et & mph is close or off

[Edited on 23-8-2005 by kzz1]




1974 Z1 A, 1988 Yamaha YSR 50, 2000 Suzuki Hayabusa GSX 1300R
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Jeff.Saunders
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[*] posted on 23-8-2005 at 16:14


I never ran the bike down the 1/4 mile in stock trim. When I first took it down the 1/4 I was running the big-bore kit and cams, but stock 28mm carbs - I could not get those carbs jetted for the cams / pistons - I think my best was only in the high 11's at that point. Switching to the 29mm carbs, my times dropped into the mid 11's fairly easily - and eventually down to 11.3. About the same time I went with the 29mm carbs, I also switched to a Boyer electronic ignition - that too helped.



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2 x 73 Z1's (one turbo'd), 1 x 74, 1 x 76 KZ900, some Honda's (CB750's and CB550), a Suzuki GS750
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