1200DOHC valve adjustment
- Thread starter DrFarkoff
- Start date
Gizmo
Registered user
Easy peeesy, nice and easy. A very sweet design solution, simple and effective and no removing cams for shims under buckets or a need for a valve compressing tool for the shim over bucket designs.
It will probably help if you work as a part time gynaecologist for the ones nearest the sprockets but it looks very do-able.
Give that designer man a cigar!!
NIce post Jaythro
It will probably help if you work as a part time gynaecologist for the ones nearest the sprockets but it looks very do-able.
Give that designer man a cigar!!
NIce post Jaythro
Looks like a right doddle. Easy Peasy.
Not that I'll be doing my own clearances though
Not that I'll be doing my own clearances though
I'm not so sure about his dab of grease in pic 9(?) which looks as though it may contain a splinter of metal as well.
Brilliant design though. If you have a micrometer that would be very easy to do at home. Looks almost idiot proof.
Brilliant design though. If you have a micrometer that would be very easy to do at home. Looks almost idiot proof.
Not sure if you need the micrometer.
usually these shims are marked with their size. Therefore by measuring the initial clearance using the feeler guages and then just add or subtract the difference to obtain the new size.
karl
RickG
Registered user
Reminds me of my Desmodromic days but so much simpler!
The issue is the time taken to get the correct new shims from the dealer once you've measured up and figured out what you need. It'll save some time once you know what shims are fitted on the bike as you can just measure the clearance and calculate what shim you need to replace it with and then try and get hold of the right one from somewhere. Bit of a show stopper though for a typical w.e service at home and not something that can be done in the usual 30 min for a lock-nut adjusted bike. Lets hope they don't need adjustment every service.
It'd be a cool if UKGER or some other group organsied a shim library that Tossers could subscribe to where we could exchange shims for a minimal fee rather than buying new ones all the time and ending up with a collection of shrapnel.
The issue is the time taken to get the correct new shims from the dealer once you've measured up and figured out what you need. It'll save some time once you know what shims are fitted on the bike as you can just measure the clearance and calculate what shim you need to replace it with and then try and get hold of the right one from somewhere. Bit of a show stopper though for a typical w.e service at home and not something that can be done in the usual 30 min for a lock-nut adjusted bike. Lets hope they don't need adjustment every service.
It'd be a cool if UKGER or some other group organsied a shim library that Tossers could subscribe to where we could exchange shims for a minimal fee rather than buying new ones all the time and ending up with a collection of shrapnel.
Deleted account 190920001
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You will need to measure the old shim because it is a wearing part so wont be the same size as it originally was. Is a very nice system though.
Bloody Germans 
Never seen much wear on a shim myself, its the valve seat/face wear from all the constant hammering and heat that usually alters the valve to follower clearance.
Agreed the design looks very cleverly thought out, I hope that there is little in the way of wear on the bore of the alloy spindle housing or face wear from the circlip through many miles of use.
RickG
Registered user
nice neat design how often do they need adjusting?
jpooch00
Registered user
Looks pretty straightforward.
Hopefully they won't skimp on the quality of those c-clips though. Looks like it would make quite a mess if one of those broke or came off. The head cover might be internally machined to prevent the follower from running off the shaft though.
Anyway, overall it looks pretty trick.
Hopefully they won't skimp on the quality of those c-clips though. Looks like it would make quite a mess if one of those broke or came off. The head cover might be internally machined to prevent the follower from running off the shaft though.
Anyway, overall it looks pretty trick.
They get checked every 6000 miles (10000 Km) and adjusted if required.
RickG
Registered user
In that case I really hope they are more stable than the 'old' 1200 as for me that would mean doing the exhaust valves nearly every service and the inlets every other. That would be about 20 shim changes a year and if they are £5 or so each, that's £100 assuming none can be swapped around
roddy
Registered user
so who's for a bet when the first
Ah feck I've lost a half sphere in the boondocks of the engine, will it .......
or
What size is the circlip on the rocker shafts, I heard a ting and now it's gone
you know it's going to happen, though I agree it looks a neat design
Ah feck I've lost a half sphere in the boondocks of the engine, will it .......
or
What size is the circlip on the rocker shafts, I heard a ting and now it's gone
you know it's going to happen, though I agree it looks a neat design
Deleted account 190920001
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That's very disappointing, Shims should have a much larger service interval than that.
my old F650 was shimmed and only needed checking or adjusting every 25000 if memory serves,
so the shimms are checked or adjusted every 6000 that sugests high loadings or poor quality materials time will tell
Surely the shim has to rotate a little in the arm because the angle between the arm and the top of the valve stem changes as the valve is depressed. Hence you have two more wear surface (the shim and the holder) compared to bucket shims which will have none.
Still a neat design though.
SMB
Still a neat design though.
SMB
With sufficient lubrication and adequate surface hardness to both the shim and follower, I doubt wear would even be noticeable bar a little micro-polishing of the surface finish.
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