Did you get this sorted ?
Either the tensioner is backing off/not locked or the camchain has slipped to one side of the crank and is not on the sprocket.

Something sounds amiss. Tower should be gripped firmly between the rubbers and not able to float around, especially if just pushed by hand. Maybe it had been assembled incorrectly. There should be metal plates on the top of the rubbers for the bolts to tighten down on and compress the damper rubbers...

What about fitting bigger valves, which is the most common way of reclaiming worn seats and the real reason most heads get larger valves. Unless the pitting is horrendous this will put the valve seat area further out on the unworn portion of the seat and you get to retain near max shim sizes. Depend...

rpeters wrote:I think the square tops, MKII etc have the bigger valves?

Square top MK2/ST etc have the same 30/36 valves.
It's just the H type injection heads that has them 1mm bigger at 31/37.

All the same size on all the kickstart engines.
36mm in and 30mm ex.
Early 900 motors has squared collet groove and the rest are round.

The stock Z1000A head has cast iron guides and the Kibblewhite valves have hard chrome plated stems which should have caused no problems and was the basis of my answer. Kibblewhite supply both cast iron and Bronze guides for use with their valves depending on intended use and application. Phosphor B...

They are all the same up to the Z1R D1.
It is the later square cam cover MK2/ST/LTD type motor that has a slightly different inner cover.

I always use Cometic head gaskets but have used Vesrah in the past with no problems.
Base gaskets I always grease both sides to aid settlement and future ease of removal.
Head gasket needs no additional sealing except a slight smear of RTV fore and aft of the camchain tunnel.

Looking for some fast road cams up to around .410 lift. 3 bolt fitment preferred.
Anything considered.

If it's the MK2 square camcover engine it should have vm28's.
To be sure, measure the inside dia of the carb stub that goes in the inlet rubbers.
If it's close to 29mm they are 28's and if they are around 27mm they are 26's.

Going by the book it's A2 grade for most of the general bolts including the camcover and A4 for the higher tensile. That being said I have all my bolts in A2 with no issues ever and that's including the sprocket and disc bolts. Despite warnings from the alarmists and expert google educated metallurg...

Thanks.
Sounds promising.

Ok, No problem.

Wanted - New/unused set of four exhaust valves and guides .
Valves can be std or stainless 30mm.
All for Z1-Z1000.

Best to use those APE billet idler blocks. They only make them to fit the early top idler and never wear out which is why I offered this set with the early one. Could have provided the later mount though . I may have one other set spare once I get some more bearings and will give the choice of top m...