Tight exhaust valves on RGS 1000

thanks Brett,
there were two body lengths of the Wal Philips, the one you show is the longer version as to the shorter one I fitted to my Arrow.
the hose clamps and stepped rubber connectors that you mention are in fact factory, and standard Jota 120 and are a very good replacement for rotten manifolds on RGS series bikes although this is TOG and she is a 1200/180/series 1.


CLEM


 
murphus said:
Did you mean 0.1mm or 1mm? A quick check shows that all three of mine are at 2.4mm.
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What you have measured seems to be the spigot length above the sealing surface of the liner.

The important dimension is the position of the liner in respect to the barrel sealing face.  The liner should be about 0.1mm BELOW the barrel sealing surface.  In no case should the liner stand proud of the barrel surface!!!

piet
 
Interesting. If I'm following you correctly, all of my liners are proud of the sealing surface and should in fact be slightly below. I don't believe anyone's ever done piston or cylinder work on the engine and they're all at roughly the same measurement. What's the process for resetting them?
 
Are you talking about liner or spigot being proud of the sealing surface?
 
murphus said:
Interesting. If I'm following you correctly, all of my liners are proud of the sealing surface and should in fact be slightly below. I don't believe anyone's ever done piston or cylinder work on the engine and they're all at roughly the same measurement. What's the process for resetting them?
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you need to look at the terminology being used here, the Liner Flange is supposed to be 0.10mm below the surface of the barrel, if it is set a lot lower the flame ring on the head gasket has trouble sealing

do no get Liner Flange confused with Liner Spigot

 
murphus said:
Interesting. If I'm following you correctly, all of my liners are proud of the sealing surface and should in fact be slightly below. I don't believe anyone's ever done piston or cylinder work on the engine and they're all at roughly the same measurement. What's the process for resetting them?
Click to expand...

Doesn't matter if there has been work done or not.  It is more a metallurgy issue and has to do with heat cycles and aluminium alloys not coping with them.  The barrels actually shrink, leaving the liners proud.

Either set the barrel on a rotating table and mill the flange (tricky, but quick), or pull the liners and turn the flange to size (a lot safer, but takes a while longer).

piet
 
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