For the 650 crowd

  • larrycavan
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16 Jul 2009 04:58 #307324 by larrycavan
For the 650 crowd was created by larrycavan
For those who are wondering about the 750 head on the 650 motors.

This week I'm doing a 750 head for a 650 drag bike. Stock vs stock, the 750 head is worth 10CFM over the 650.

From a flow perspective, that's even more of an increase than the 83GPz is over a stock J [74 vs 82]

Peak flow is the same as a KZ900 / 1000 head [68@10"]but with a 2mm smaller intake valve [34 vs 36].

So there you have it.... :)

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16 Jul 2009 05:50 #307342 by Bluemeanie
Replied by Bluemeanie on topic For the 650 crowd
Very interesting, Thanks for the info...:)
1980 KZ650F1, Bought new out the door for $2,162.98!

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  • The Gringo
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  • ¡Usted no necesita otra motocicleta!
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16 Jul 2009 06:23 #307353 by The Gringo
Replied by The Gringo on topic For the 650 crowd
Larry is the head you are working on off a GPZ750 or an E model or LTD?
Andy
Akron, Ohio
80 Z-1 Classic-Sold
84 GPZ1100
79 KZ 1000 LTD
78 KZ 1000 A2
77 KZ 1000 LTD-Sold
76 KZ 900 The definition of a barn find
76 KZ 900-Sold gone to Denmark
KZ 750 times 3, KZ 650 times 8 Sold 1 down to 7
KZ 550 times 2 80 440LTD-Sold
81 CSR 305-Sold 81 Yamaha XS650 Special

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16 Jul 2009 09:59 - 20 Jul 2009 09:40 #307381 by 89LX
Replied by 89LX on topic For the 650 crowd
Let me jump in here as it's my head (Hi Larry).

I bought the head off of e-bay.

The seller said it was off of an '80 KZ750E.

It had all of the proper bosses, holes, and slots (cam chain wise) to use on my '77 KZ650 engine.
1977 KZ650B1
Overbored to 66mm in '79 w/ Venolia pop-up pistons & RC400Pro Cams
Restoration in process.....
Last edit: 20 Jul 2009 09:40 by 89LX. Reason: spelling

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16 Jul 2009 21:08 #307500 by KawiConvert
Replied by KawiConvert on topic For the 650 crowd
larrycavan wrote:

For those who are wondering about the 750 head on the 650 motors.

This week I'm doing a 750 head for a 650 drag bike. Stock vs stock, the 750 head is worth 10CFM over the 650.

From a flow perspective, that's even more of an increase than the 83GPz is over a stock J [74 vs 82]

Peak flow is the same as a KZ900 / 1000 head [68@10"]but with a 2mm smaller intake valve [34 vs 36].

So there you have it.... :)


Is the flow numbers for the 83 gpz750 head? If so, which is the 650 number and which is the gpz?
1978 KZ650 D1 ~ Carb jetting: 107.5 & 20 & 4th groove with pods and 4-1 Exhaust

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