750 twin race bike
- steell
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19 Feb 2008 20:38 #195732
by steell
KD9JUR
750 twin race bike was created by steell
Spent a little while on the phone this evening talking to a guy that races a 750 twin, thought I'd post a pic and talk about it a little.
Hmm, seems like Gwenview is having a little trouble resizing it, I'll try and add the pic later.
85 hp at the rear wheel, with cams with .585 lift, but it broke the cam chain (that's why he called). Cylinder liners removed, block bored, new aluminum (yes I said aluminum) liners with Nickisil coating pressed in. Somewhere near 900 cc (I already forgot the exact number) using JE pistons and .0005" (no, that's not a typo) piston to wall clearance. 44mm intake valves and shim under bucket (37mm buckets). Said he's been racing the bike and developing it for six years, races in a couple of classes including against modern twins, and can hold his own with the Buells, etc.
Currently removing the balance shafts to see how that's going to work since he is breaking them anyway.
Massive porting of course, and 39mm carbs (Mikuni)
Post edited by: steell, at: 2008/02/20 09:11
Hmm, seems like Gwenview is having a little trouble resizing it, I'll try and add the pic later.
85 hp at the rear wheel, with cams with .585 lift, but it broke the cam chain (that's why he called). Cylinder liners removed, block bored, new aluminum (yes I said aluminum) liners with Nickisil coating pressed in. Somewhere near 900 cc (I already forgot the exact number) using JE pistons and .0005" (no, that's not a typo) piston to wall clearance. 44mm intake valves and shim under bucket (37mm buckets). Said he's been racing the bike and developing it for six years, races in a couple of classes including against modern twins, and can hold his own with the Buells, etc.
Currently removing the balance shafts to see how that's going to work since he is breaking them anyway.
Massive porting of course, and 39mm carbs (Mikuni)
Post edited by: steell, at: 2008/02/20 09:11
KD9JUR
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- Biquetoast
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- King Jeremy The Wicked
20 Feb 2008 02:55 #195758
by Biquetoast
(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com
Replied by Biquetoast on topic 750 twin race bike
steell wrote:
Where is this guy from? Why have I not seen his bike in a magazine(s)? It sounds awesome!
:huh:
Oh what a tease! Send me the pics if you have too much trouble and I'll take care of them for you....I'll work on resizing the pic(s) tomorrow, it's past my bedtime
Where is this guy from? Why have I not seen his bike in a magazine(s)? It sounds awesome!
:huh:
(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com
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- steell
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20 Feb 2008 06:19 #195775
by steell
KD9JUR
Replied by steell on topic 750 twin race bike
Another one
He's in Canada, and have you ever seen anything good about the 750 twins printed in a bike mag? Seems to be considered the "Black sheep" of the KZ line,
Post edited by: steell, at: 2008/02/20 10:05
He's in Canada, and have you ever seen anything good about the 750 twins printed in a bike mag? Seems to be considered the "Black sheep" of the KZ line,
Post edited by: steell, at: 2008/02/20 10:05
KD9JUR
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- steell
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20 Feb 2008 06:20 #195776
by steell
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- BSKZ650
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- quader98
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- N0NB
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- Blue handles better
20 Feb 2008 14:18 #195889
by N0NB
Nate
Nates vintage bike axiom: Riding is the reward for time spent wrenching.
Murphys corollary: Wrenching is the result of time spent riding.
1979 KZ650 (Complete!)
1979 KZ650 SR (Sold!)
1979 KL250 (For sale)
1994 Bayou 400 (four wheel peel
)
Replied by N0NB on topic 750 twin race bike
Who cares what the rags thought? 
We know better.
We know better.
Nate
Nates vintage bike axiom: Riding is the reward for time spent wrenching.
Murphys corollary: Wrenching is the result of time spent riding.
1979 KZ650 (Complete!)
1979 KZ650 SR (Sold!)
1979 KL250 (For sale)
1994 Bayou 400 (four wheel peel
)
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- loudhvx
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- KZr Legend
20 Feb 2008 21:02 #195962
by loudhvx
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Replied by loudhvx on topic 750 twin race bike
Coool! 
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- Becker
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- The Doctor Will Rise Again
- KZ250LTD
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- steell
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08 Jul 2008 05:08 - 08 Jul 2008 05:10 #224848
by steell
KD9JUR
Replied by steell on topic 750 twin race bike
Other factors like maybe 38mm CV carbs vs round slide 39mm carbs maybe?
J motors use 34mm CV carbs stock, and the 29mm smoothbores are considered a big upgrade.
J motors use 34mm CV carbs stock, and the 29mm smoothbores are considered a big upgrade.
KD9JUR
Last edit: 08 Jul 2008 05:10 by steell.
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