- Posts: 101
- Thank you received: 6
82/83 GPZ N1 750 top end kit/tips
- jenningsjesse
- Topic Author
- Offline
- User
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
- Posts: 22970
- Thank you received: 2749
Steve
Please Log in or Create an account to join the conversation.
- jenningsjesse
- Topic Author
- Offline
- User
- Posts: 101
- Thank you received: 6
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
- Posts: 22970
- Thank you received: 2749
Steve
Please Log in or Create an account to join the conversation.
- jenningsjesse
- Topic Author
- Offline
- User
- Posts: 101
- Thank you received: 6
Please Log in or Create an account to join the conversation.
- Nessism
- Offline
- Sustaining Member
- Posts: 7507
- Thank you received: 2823
Sounds like a teardown and inspection is in order. If you don't have a bore gauge find someone that does and measure the pistons and bores. If there is more than .001" out of round and/or taper in the holes then a rebore is in order.
Assuming the bores are okay then you can bottle brush hone the cylinders and install new OEM rings. If you need a bore job there are various options including a Wiseco big bore kit or one from Cruise Image.
A valve job would be a wise investment. A shop like APE can take care of that for you.
OEM Kawasaki parts and gaskets are highly recommended. Aftermarket gasket kits range in quality from passable to criminally crappy. Considering all the time and energy involved with a rebuild, cheaping out on gaskets is a questionable path forward.
Please Log in or Create an account to join the conversation.
- Tyrell Corp
- Offline
- User
- "You were made as well as we could make you"
- Posts: 1650
- Thank you received: 261
Gummed up rings can unstick themselves just with some miles and maybe a shot of upper cylinder lubrcant or injector cleaner. Bikes laid up for a long time often do this,
My 45k GPz750R1 had just this down to 50 psi on one. Search here for the thread.
When CR testing, did you have the throttle wide open? low vacuum and low compression on the same pots , do more diagnostics before taking it apart. Can you do a hot CR test?
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
Please Log in or Create an account to join the conversation.
- Scirocco
- Offline
- Premium Member
- Never change a running system
- Posts: 4197
- Thank you received: 2063
Vacuum sync showed little to no vacuum on cylinders 2 and 3, about 70psi cold, and 1 and 4 were about 115 on compression check cold.
I think he do the compression test on all cylinder at the same condition, (full throttle)
I would pull the cylinder head and fill the combustion chambers with fuel and searching for leaks in the
in- and exhaust ports, specially #2 and 3.
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
Please Log in or Create an account to join the conversation.
- Tyrell Corp
- Offline
- User
- "You were made as well as we could make you"
- Posts: 1650
- Thank you received: 261
This gummed rings thing, as well as my 750 I had it also on a GPz11 motor that had been laid up a long time. Poor compression on all down to about 70 psi...Coaxed it into life with a bit of starter fluid and run it up, hot test better around 120 psi just five mins of running. It is going to be bored out anyway, I just wanted to hear it run before splitting it.
If the motor has been left for a long time in any position then on a four pot there will be two valves open at any time, moisture gets in to the cylinder through the exhaust pipe / carb and open valve. Two pots down points to this -just I would do more before pulling it apart.
1980 Gpz550 D1, 1981 GPz550 D1. 1982 GPz750R1. 1983 z1000R R2. all four aces
Please Log in or Create an account to join the conversation.
- jenningsjesse
- Topic Author
- Offline
- User
- Posts: 101
- Thank you received: 6
Please Log in or Create an account to join the conversation.
- jenningsjesse
- Topic Author
- Offline
- User
- Posts: 101
- Thank you received: 6
Please Log in or Create an account to join the conversation.
- SWest
- Offline
- Sustaining Member
- 10 22 2014
- Posts: 22970
- Thank you received: 2749
Steve
Please Log in or Create an account to join the conversation.