Weirdness after top end rebuild: KZ650

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Weirdness after top end rebuild: KZ650

11 Mar 2023 10:55 - 11 Mar 2023 13:23
#881380
Nevermind!

KZ650 is running great after the top end rebuild.

Hope everyone is having a good weekend. I rode the bike like crazy today!
Last edit: 11 Mar 2023 13:23 by DanMadBoy.
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  • SWest
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Re: Weirdness after top end rebuild: KZ650

11 Mar 2023 17:00
#881390
DanMadBoy wrote:
Nevermind!

KZ650 is running great after the top end rebuild.

Hope everyone is having a good weekend. I rode the bike like crazy today!

Does that mean you won't post pics of  the rollers, you and the bike? 
[img

Steve
 
Z1b1000 1975 Z1b
kzrider.com/forum/11-projects/598262-kz-...-will-it-live#672882
kzrider.com/forum/2-engine/597654-poser?start=240#704229
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Re: Weirdness after top end rebuild: KZ650

11 Mar 2023 17:15 - 11 Mar 2023 17:17
#881392
SWest wrote:
DanMadBoy wrote:
Nevermind!

KZ650 is running great after the top end rebuild.

Hope everyone is having a good weekend. I rode the bike like crazy today!

Does that mean you won't post pics of  the rollers, you and the bike? 
[img

Steve


 
I did post a photo of the bike, but some ppl in this forum are so hostile, I took it down.
FYI Im not yet 30, in grad school and have a KZ650. Thats about all i got.

Youve been helpful though, and I appreciate it. Only problem I have now is, sometimes when Im at a light and it turns green, I roll the throttle and the bike shudders before it starts going.
Last edit: 11 Mar 2023 17:17 by DanMadBoy.
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  • Nessism
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Re: Weirdness after top end rebuild: KZ650

11 Mar 2023 17:31
#881395
DanMadBoy wrote:
 
Youve been helpful though, and I appreciate it. Only problem I have now is, sometimes when Im at a light and it turns green, I roll the throttle and the bike shudders before it starts going.
Could be carbs.  Could be ignition.  Hard to say.

Please check the "things to know" thread linked in my signature.  It details out a bunch of things to check.  Something may prove helpful.

And with the bike coming off a rebuild, you should retorque the cylinder head and check the valve clearances after a few hundred miles.  Most OEM's say something like 600 miles.  And if you find the cylinder head nuts loose, tighten them and check them again in 200 miles more, until subsequent checks show the nuts are staying tight.
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
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Re: Weirdness after top end rebuild: KZ650

11 Mar 2023 17:34
#881396
Nessism wrote:
DanMadBoy wrote:
 
Youve been helpful though, and I appreciate it. Only problem I have now is, sometimes when Im at a light and it turns green, I roll the throttle and the bike shudders before it starts going.
Could be carbs.  Could be ignition.  Hard to say.

Please check the "things to know" thread linked in my signature.  It details out a bunch of things to check.  Something may prove helpful.

And with the bike coming off a rebuild, you should retorque the cylinder head and check the valve clearances after a few hundred miles.  Most OEM's say something like 600 miles.  And if you find the cylinder head nuts loose, tighten them and check them again in 200 miles more, until subsequent checks show the nuts are staying tight.
 
Thanks for this. The carbs were in tip top shape before the top end was done, so I dont believe the problem lies with them. Maybe fuel delivery or ignition? Anyway, my uncle's friend who did the work is on a 2 week cruise with his Mrs now, so I will have to figure it out.

Could the stuttering be down to things just settling after the top end rebuild?
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Re: Weirdness after top end rebuild: KZ650

11 Mar 2023 23:09
#881398
=19.5pxhi not to take this off thread but ref retorque i thought that if a multi layer head gasket was used it applies ,due to heat cycles but how was this done when all these z were new back in the day  
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 03:39
#881399
david richard wrote:
=19.5pxhi not to take this off thread but ref retorque i thought that if a multi layer head gasket was used it applies ,due to heat cycles but how was this done when all these z were new back in the day  
If it's an MLS gasket then no re-torque needed.
If it's a normal fiber or copper etc then re-torque after cooling on first start up and then again a few hundred miles later.
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 05:41
#881400
Thanks for responding
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 08:29
#881404
david richard wrote:
=19.5pxhi not to take this off thread but ref retorque i thought that if a multi layer head gasket was used it applies ,due to heat cycles but how was this done when all these z were new back in the day  
"Back in the day" at the Lincoln factory, the guy who unpackaged the engines from Japan retorqued the cylinder head nuts. The engines were run up in Japan as part of the final inspection, but I was never told how long they were run. Hard to believe that they were run long enough to reach full operating temperature, but IDK.  I believe the first MLS  head gasket was the liquid cooled 1984 GPZ900.

Mike
 
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1966 W1 (the Z1 of 1966-50H.P. and 100mph!)
1974 Z1
1978 KZ1000 LTD
1976 KZ900B pile O parts
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1980 Honda XL250S (I know, wrong flavor!)
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 12:33
#881421
THANKS TO ZED1015 AND KRAZEE1SORRY  TO HIJACK THIS BUT IS IT BEST TO REMOVE THE CAM COVER TO DO ALL THE BOLTS SO ITS EVEN TORQUE 
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 14:43
#881432
No need to remove the valve cover to re-torque the head nuts!
My 1975 Z 1 B 900 Project

www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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Re: Weirdness after top end rebuild: KZ650

12 Mar 2023 18:05
#881443
The 650 head has two bolts in the cam tunnel.  These are the ones, that on later year 650's, and the 750/4's, that are stretch to yield.  
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
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