head swapping

  • 78650
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head swapping

16 Nov 2014 09:21
#653831
I have a 78 kz650 with out the extra ports in the head....can a head from a 1979 be used with the extra ports ...if so can i plug them...or is it not worth it...also is everthing else the same

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  • 650ed
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Re: head swapping

16 Nov 2014 11:51
#653843
What "extra ports" do you mean? Are you referring to the "clean air" apparatus? If so, why would you want to use that as it often cause problems as the reed valves fail? Many folks plug those up so their engines run better. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re: head swapping

16 Nov 2014 12:16
#653847
The ports that are in the heads under the valve guides these are the heads with the different can covers..

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Re: head swapping

16 Nov 2014 12:42
#653850
Right. Those different covers have the reed valves in them which are part of the "clean air" system. They do not help performance if that is your objective. Ed
1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)

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Re: head swapping

16 Nov 2014 12:58
#653852
got ya......my issue is that the original head for my 78 was cracked..i got on off ebay and the seller said it was for a 78 ...but it is not It has the ports that I am talking about..i just wanted to know if I could use it if I got the different cam cover and if I could block off that system ors it not worth it...do you know anyone that has a head for sale for a 78 650b

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  • Nessism
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Re: head swapping

17 Nov 2014 05:07 - 17 Nov 2014 06:44
#653919
There are threads here in the archives detailing how some guys thread the air injection ports and install plugs to block off the system. An easier option is to get the later valve cover and just connect the two reed valve ports together with a hose, or fab up or purchase, block off plates for the reeds. I've got a couple spare valve covers from a KZ750 which I think is the same just in case that would help. PM me as appropriate.
Ed
Carb O-ring Kits : www.kzrider.com/forum/3-carburetor/61807...-o-ring-kits?start=0

www.kzrider.com/forum/faq-wiki/618026-new-owner-things-to-know

1981 KZ750E2
www.kzrider.com/forum/11-projects/604901...z750e-project-thread
Last edit: 17 Nov 2014 06:44 by Nessism.

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  • Tyler
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Re: head swapping

17 Nov 2014 07:54
#653934
go to the hardware store and get some 3/8" fine thread allen set screws. tap the holes so that the set screws run in flush to the top. then you can run an older style valve cover without the reed valves on it. this is much simpler and cleaner looking than blocking off the reed valves.
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro

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Re: head swapping

17 Nov 2014 11:03
#653948

Attachment DSCF1624camcover.jpg not found

1980 LTD 1000..,1976 LTD 900, have the 1000&900 now. the rest are previous= 1978 KZ 650 B.., 1980 Yamaha XT 500..,1978 Yamaha DT 400.., 1977 Yamaha yz 80..,Honda trail ct 70.., Honda QA 50...5-1/2 hp brigs & straton CAT chopper mini bike...3-1/2 hp mini bike (WHEN GAS WAS ABOUT 45 CENTS A GALLON)!!!!

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Re: head swapping

17 Nov 2014 11:33
#653958
Tap and plug the top side of the head correct...not in the head by the valve guide...and i can use my stock cam cover.

thank you

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Re: head swapping

17 Nov 2014 22:42
#654024
Correct, You will need a plug tap to do the job. holes are the correct size so you don't even have to drill, just tap the holes.
If I knew what I was doing all the time life wouldn't be any fun.

'80 KZ650 E 700cc, dyna ignition and coils, frame up restoration, daily driver
'81 KZ1300 A3 full restoration, custom big bore pistons, 1400cc 6 cylinder super bike
"77 KZ650 B1 - Barn Find, work in progeress
"74 Yamaha DT 400 Enduro
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