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TOPIC: Drag strip trip.

Drag strip trip. 11 Jun 2012 23:52 #528367

  • zukdave
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So I got a chance to make some dyno run's this past weekend
Best rear wheel was 77.77 HP and 100.21 ft. lbs.

Rpm's in this pic. read 1/2 the true rpm's for some reason but
the bobble at the end is the rev. limter gettin mad.

I think the 117.5 main's I put in killed the power around 8000
so back to the 120's or maybe the 122.5's I have.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 12 Jun 2012 00:22 #528379

  • wireman
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Id say thats pretty impressive power for a stock motor with a set of carbs B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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Drag strip trip. 12 Jun 2012 00:25 #528381

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Have you worked out the traction issues yet? B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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Drag strip trip. 12 Jun 2012 09:05 #528440

  • LarryC
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Is that dyno chart supposed to be from a KZ750 with an 810 kit with stock cams?

I don't want to rain on your picnic but that's just freaking over the top :unsure:

If it is, that's one more example of a f'kd up dyno jet reading. There's not a snowball's chance in hell that thing is laying down 100 ft.lbs of torque at the rear wheel.

The photo isn't very clear when I downloaded it to see the chart better. Anyway, do the math and the torque value is way out in left field.

Example:

Say that 77HP is at 8500 RPM. The toque value would be about 47 ft.lbs.

Say the peak torque happened at 7000 RPM. That's 134HP :whistle:
Larry C.
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Last edit: by LarryC.

Drag strip trip. 13 Jun 2012 09:07 #528782

  • zukdave
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Larry I'm not sure he had it set up right as the rpm scale
at the bottem only go's to 5500 rpm's.

as for the motor it's a bone stock never opened 8500 mile 83 gpz750.
Will be rejettin and going back for some run's so maybe then I can get a better reading.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 14 Jun 2012 06:49 #529037

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More rain...
My full silly race bike from that era (also based on a kz750 , kinda :0 ) was straining to make 122hp and 63 ft/lbs .
and yes Larry , that was right before it blew up (that week) .
Don't get me wrong I loved that engine but at anything approaching 110 hp , 10000 rpm or just one blown down shift it was back to square one .
I even had one unload just chopping the throttle from 4k rpm no load .

~kop
"There are two major pressure changes in a four stroke internal combustion engine , when you light the fire and when the rods exit the block..."

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Drag strip trip. 14 Jun 2012 18:14 #529133

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I have no doubt the dyno operator hands out charts they feel are accurate.... But I'll stand right up and call bullshit when I see it :)
Larry C.

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Drag strip trip. 14 Jun 2012 22:38 #529194

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Larry I didn't post this to bragg about my junk
making these number's I know better.
I posted because I got a chance
to put my junk on a dyno and the number's seemed fucked up to me.

Like I said before the 77hp seem's reasonable but the 100ft. lbs.
is a bull shit number and I know that.
The read out is just wrong
I think your 47 maybe low 50's would
be more in the ball park.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 23 Jun 2012 00:37 #531148

  • CoreyClough
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You should get air/fuel readings with any dyno session.
'85 GPz550(ZX550-A2)

GPz550 Base Manual --> tinyurl.com/ze5b3qo
GPz550 Supplement Manual --> tinyurl.com/h34d2o6
GPz550.com --> www.nwsca.com/scripts/gpz_forum_2005/default.asp
First Race Win GPz550 --> tinyurl.com/o5y3ftp

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Drag strip trip. 09 Jul 2012 22:56 #534949

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Corey it wasn't a dyno session just a $25 trailer ride
at a bike rally

So went back to the track after playin with the
carb.'s some more and going up 3 teeth on the rear sprocket.

101 degree day with track temp I'd say around 140 or so
and greasy as 1/2 cooked bacon went a best pass of
12.26 at 103 with a 1.80 60 ft. blowin the tire off.

I measured the tire between the rubber bead's
and Im only gettin 3" of rubber on the ground at 20 psi.
so in go's the gpz swingarm so I can fit about a 170 tire.


Monthly bonus check come's Friday so callin Buchanan's and
ordering a 17x4 Alum. rim and spoke kit then figger out what tire to run.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Last edit: by zukdave.

Drag strip trip. 10 Jul 2012 00:51 #534979

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Attachment popcorn_2012-07-09.gif not found


B) B) B) B) B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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Drag strip trip. 10 Jul 2012 20:30 #535135

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Was looking at tire's and M/C super store list's
a 180/55/18 Shinko 003 stealth soft compound.

Would there be any benafit staying with an 18" rim
or stepping down to a 17" like I plan.
The 17" is for a better choice of tire's.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 11 Jul 2012 00:20 #535185

  • wireman
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17" would be easier to find cheap rubber for Im guessing,you could probably pick up sticky 180 rear tires pretty easy from sportbike guys upgrading their equipment B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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Drag strip trip. 11 Jul 2012 00:26 #535187

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One thing to remember about those wide ass sticky tires is theyre a lot harder on driveline parts than that little 130 youve been running,so just be ready to watch chain/sprockets and transmission a lot closer. B)
You might be better off running something closer to a stock/street compound on a slightly used sportbike tire till you work the bugs out of the system.
and remember if its not breaking the tire loose is going to be bogging that motor down if you launch it too hard. B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.
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Drag strip trip. 11 Jul 2012 20:51 #535334

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Has new chain, sprocket's and rear wheel bearing's
now.

The 180 is the only 18" tire Shinko offers in a soft compound.
Think I will be going with the 17" rim simply because of the tire's
available.

I think a 180 would be over kill for my junk
some where around a 160 would work better.

Called Buchanan's today about a 17" black anodized
alum rim and stainless spoke kit.
Was gonna lace it myself but for $100 buck's and a
two week turn around I'm gonna send them my hub and have them do it.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 11 Jul 2012 22:03 #535348

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Lacing rims is an aquired skill,problem is I dont do often enough to retain that aquired skill in my head! :woohoo:
yeah for $100.00 id let somebody do it also. B)
posting from deep under a non-descript barn in an undisclosed location southwest of Omaha.

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Drag strip trip. 15 Jul 2012 15:02 #536096

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Got started on the new strut's and mount's
Will be using a step drill to do five stepped hole's
in them have the tab's welded then the whole mess will get polished.

1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...
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Last edit: by zukdave.

Drag strip trip. 13 Aug 2012 04:59 #542234

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Some more pic.'s

I first made the tab's with three hole's but they hung off the arm
on the outside to much.

With a 130 tire.
1980 KZ650 F1
ZX750A1 motor.
Wiseco 810cc kit.
Zukiworks racing ported head.
VM 29 smooth bore's.
Dyna 2000 Ign. w/Dyna mini coil's
APE cylinder stud's and nut's.
APE valve spring's.
APE Track King clutch.
V/H KZ1000 sidewinder.
3.5x18 laced to a KZ1000 disk hub.
150/60/18 Shinko 006 Podium.
63"...

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Drag strip trip. 13 Aug 2012 11:41 #542256

  • Kidkawie
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Subscribed.

Cool thread!
1975 Z1 900
1994 KX250 Showroom Resto
2004 KX125

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Drag strip trip. 13 Aug 2012 14:06 #542279

  • z1kzonly
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That's simple and COOL. I've been there a bunch of times with Z1's and KZ900's
I recall you were looking for a wider rear wheel?
I might be selling this one from a 89 ZX10, 4.5" x 18" it has a used 5.5" slick on it
with a 530 size chain, 45 tooth sprocket.
This pic was from the winter time.
I am waiting on a freind of a freind to buy this roller. If not I am going to part it out.

Livin in "CheektaVegas, NY
Still have a Kaw! 76 KZ900 Pro-Street.
Went thru 25 of these in 40 yrs.

And The Old Girl, Harley 75 FLH Electra Glide,
Old faithful! Points ign. Bendix Orig. carb.
Starts everytime!

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