Have a close look at the tip of your valve/s. It's often both valve tip and adjuster that end up looking shite. A good reason why a lot of us have converted to Rotax adjusters - not a straight fit though and requires removal of the head and some minor surgery to rockers - but well worth it IMHO.I'm told there's a vauxhall part that can be used instead - anyone know the part number please? or ideally anyone with a Laverda one spare. One of mine has some sort of weird decay and is badly pitted.
The valves new, the head is off so if I'm going to go down a non standard route then now's the time.Have a close look at the tip of your valve/s. It's often both valve tip and adjuster that end up looking shite. A good reason why a lot of us have converted to Rotax adjusters - not a straight fit though and requires removal of the head and some minor surgery to rockers - but well worth it IMHO.
On the thick cast SF1 rockers I needed t grind a fair bit from the underside of the tappet end
You do need to shorten them a tad and possibly grind a little off the tip of the valve and maybe a tad from the underside of the rocker arms.
On the later rockers I had to relieve a mm or two from the underside and I also tipped off a mm or two from the valve tip. You can see what needs when you have it apart, but it wasn't a big job. IIRC the screws were pretty long and were cut off and a new square filed on for adjusting.
There seem to be at least two options as wellI had one of those elephant's foot adjusters let go ... found the centre inlet rocker had jumped the pushrod.
The valves new, the head is off so if I'm going to go down a non standard route then now's the time.
However.....
There seem to be at least two options as well
With the captive half bearing design there will be no need to modify the rocker so are they preferable (they're cheaper). The Rotax style ones are £25 each.
Others are saying go with a mushroom head design though a quick Google doesn't find any with an M7 thread.
Heeeeeeeeeelp please
Head is being "rebuilt" I put that in quotes because I cant quite remember exactly what's been done by Keith and Laverda Scotzia. In summary though - a lot.Olly, forget the overthink.. there are bound to be original parts available.. as Paul suggests.. and I suggest with a small wink..
You only need one.. if you were doing a full head rebuild, then this may be different in my view
Go for the best, original and available offered by long term friends..
Just my humble opinion..