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Search found 37 matches

Author: garybrez
Wed Jul 21, 2021 7:15 pm
Forum: Bike Help
Topic: z1 valve shims
Replies: 15
Views: 1528

Re: z1 valve shims

What to do ..... My original theory based on a 1.70mm shim giving me 0.40mm clearance, was to reduce the clearance by replacing the 1.70mm shim with a 2.0mm shim. That should give me a reduction in clearance by 0.30mm ending up with 0.10mm clearance with a 2.0mm shim I could go further by adding a 1...
Author: garybrez
Tue Jul 20, 2021 7:09 pm
Forum: Bike Help
Topic: z1 valve shims
Replies: 15
Views: 1528

Re: z1 valve shims

2.60 ... 2.70 ...2.75...2.65 ... clearances between 0.08mm and 0.10mm.... I did not check if the new valves x 2 had been tipped, I am beginning to think not. Anyway rant over .... I will buy 2.15mm shims which should give me top tolerance 0.15, prefer it to rattle a bit than all the clearances disap...
Author: garybrez
Mon Jul 19, 2021 7:34 pm
Forum: Bike Help
Topic: z1 valve shims
Replies: 15
Views: 1528

Re: z1 valve shims

Would 2.05mm or 2.10mm do it ?
Author: garybrez
Sun Jul 18, 2021 7:41 pm
Forum: Bike Help
Topic: z1 valve shims
Replies: 15
Views: 1528

Re: z1 valve shims

OK so this is what I intend to do next ( Cylinder head bench set up ) I found a large penny washer 1.70mm thick, rotated cam lobe to vertical position then measured clearance of 0.40mm ( target clearance 0.10mm clearance is too big by 0.30mm ) by my calculation purchasing and adding a 0.20mm shim sh...
Author: garybrez
Sun Jul 18, 2021 12:52 pm
Forum: Bike Help
Topic: z1 valve shims
Replies: 15
Views: 1528

z1 valve shims

Hi ..... I recently got my cyclinder head back after some valve re-seating and replacement valves ... the valve tips were ground to help with shimming but i am having a mare with exhaust 2 & 4 ... Popular to belief if the gap is too small add a smaller shim ( correct ?? ) I have no gap ( smalles...
Author: garybrez
Fri Jul 09, 2021 6:07 pm
Forum: Bike Help
Topic: Z1 head build
Replies: 2
Views: 489

Re: Z1 head build

Also, should the valve guides have a groove for the seal to locate in
Author: garybrez
Fri Jul 09, 2021 5:40 pm
Forum: Bike Help
Topic: Z1 head build
Replies: 2
Views: 489

Z1 head build

Hi .....

I am starting a cyl head rebuild and have an issue with valve stem seals

The original ones were removed while the head was at the vapour blasters, the problem is the new ones will not stay fitted to the valve guide, should they latch on the guide or move up and down the valve stem
Author: garybrez
Fri Jun 11, 2021 8:51 pm
Forum: Bike Help
Topic: Z1A cyl head re-fit
Replies: 1
Views: 479

Z1A cyl head re-fit

Hi I recently had some refurb work done on my Z1A cylinder head .. valve seats recut .. replace bent valves ,, replace damaged guides. new valves tip ground to help shimming .. Anyway to the rebuild ... I would be grateful of any tips to help me get it back together e.g can I bench build the head to...
Author: garybrez
Sun Oct 06, 2019 5:53 pm
Forum: Bike Help
Topic: Z1 valve seal replacement
Replies: 10
Views: 3821

Re: Z1 valve seal replacement

thanks for the tips …… seems I have some exhaust valve seats that are pitted too much to lap out and will need cutting ….. probably a bit specialized with the tool to match ….. any contacts in the north east for this
Author: garybrez
Sun Sep 15, 2019 2:35 pm
Forum: Bike Help
Topic: Z1 valve seal replacement
Replies: 10
Views: 3821

Re: Z1 valve seal replacement

Thanks for the tips ……. yes valves / seals all removed before vapour blast …. as I need new top end gaskets & seals would it be cheaper to buy a gasket set ( are valve seals included ) oh and of course I need #3 exhaust valve to replace the bent one
Author: garybrez
Thu Sep 05, 2019 6:25 pm
Forum: Bike Help
Topic: Z1 valve seal replacement
Replies: 10
Views: 3821

Z1 valve seal replacement

Hi … I need to renew my valve oil seals on a Z1A …The head is off and has been vapour blasted … not done valve seals before, do I need any special tools ? any tips / videos would be handy
Author: garybrez
Sun Jul 14, 2019 5:24 pm
Forum: Bike Help
Topic: Z1A valve shims
Replies: 14
Views: 4249

Re: Z1A valve shims

OK breakthrough ………. took the head off and shone a light combustion chamber side ….. light shone through when valve should be shut... not sure if bent or just wants re-seating …. I need a local expert to decoke / re-seat etc
Author: garybrez
Sun Jul 14, 2019 12:05 pm
Forum: Bike Help
Topic: Z1A valve shims
Replies: 14
Views: 4249

Re: Z1A valve shims

sorry did not intend to confuse ……. bottom line is cyl 3 exhaust gap was too big in the beginning and adding a thicker shim has only made the gap even bigger
Author: garybrez
Sat Jul 13, 2019 6:18 pm
Forum: Bike Help
Topic: Z1A valve shims
Replies: 14
Views: 4249

Re: Z1A valve shims

I did have slight resistance when I turned it over by hand but assumed natural piston motion, but how could I have bent a valve turning by hand … either way it looks like a bent/sticky valve and a head off job ….. is this a complicated task ?? I really could do with someone just sorting it for me
Author: garybrez
Fri Jul 12, 2019 4:18 pm
Forum: Bike Help
Topic: Z1A valve shims
Replies: 14
Views: 4249

Re: Z1A valve shims

thanks for the tip but I already tried ….. all other cylinders have good vacuum apart from cyl 3 … this cyl has 3.05 shim in and the gap is still too big, wanting a 3.20 shim but I feel this will cause even more grief as the valve moves closer to the piston crown

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