Hi all

I have been given a spare MC18 Cylinder Barrel (which doesn’t happen very often). The main issue with this is that I don’t know if its from a Mk1 or Mk2 MC18 and the person who gave it me as no idea either!

If it’s a Mk1 then I can keep it as a spare for my MC18 R2J and if a Mk2 then my son can have it for his MC18 R5K.

I know the spares list show Different Part Numbers for Mk1/2s Cylinder Sets, for instance CYLINDER Set A for the:
- R2/4Js uses Part 06121-KV3-701;
- R5/6Ks uses Part06121-KV3-770;
and differing Part Nos are used for the other Cylinder Sets B, C.

My questions are:
- Is there anyways of finding out which Mark of MC18 this Barrel is from or am I just worrying too much LOL,?
- Are the differences between the Mk1 & Mk2 RC Valves as such, that they visibly don’t match or fit?

Note: I did put some spare RC Valves from a MC18 R5K in and they seem to fit ok, for example:
• rotation looks the same;
• Valves sit in their recess ok;
• R5K Right Hand RC Valve hits the same mark made by the original on the Exhaust Chamber;
• Comparing measurements between the original RC Valves and the R5K RC Valves appear to be approx. the same.

The only real difference I could spot, was that the left RC Valve had a slightly bigger chamfer on it as shown in attached photo.

This is very much not an exact science I have employed as I don’t have the necessary tools and I know seeming to be ok and actually being ok can be vastly two different worlds, but any help would be gratefully received as aways!

Many thanks in anticipation.

Philip