Wanted Royal Enfield 505 Barrel

[Jstep]

1929 Royal Enfield 500cc twinport barrel wanted and /or any engine spares.
John Stephenson jstep1949@outlook.com 0793 4714868

[murdo]

What is wrong with that barrel?

[Jstep]

Nothing but its not off the bike here is a photo of my barrel the 3/8" holes have been increased to M12 and sections of the spigot have been cut off.

[murdo]

Oh bugger. Can it be re-sleeved and the holes bushed?

[Jstep]

I was thinking that the holes could have M12 studs brazed in and cut off, then re-sleeve the bore with a liner to create the spigot. Then the 3/8" holes could be re-drilled and tapped into the steel studs. But all this is tricky and could be a disaster waiting to happen so I would like an alternative barrel to fall back on if the worst happens. I have a head that has not been butchered that would fit another barrel my head is also badly butchered.
John     

[Rex]

Personally I would get the barrel resleeved (not a hard job) and make up some stepped studs for the over-sized barrel holes, which is also an easy job.

[Jstep]

M12 hole would break through into sleeve area plus the spigot was cut off to allow the butchered head to fit. I want to use the good head and have a spigot on the barrel.

[Rex]

The replacement spigot would be a part of the new liner? Do you mean the new liner would encroach on the M12 clearance hole? If so that's not a problem either.
Screw the new stepped studs down tight and mark the area of the stud that would encroach, remove them then relieve the studs with a grinder, file etc.

[Jstep]

Sorry Rex you have it wrong the stud holes that are in are too close to the barrel wall as it is now if the barrel was bored out for a liner the machining would break through into the stud holes, that's why I would need to plug them. Also the studs need to come out through the head to facilitate the removal of the rocker box with the engine in the frame. Here is a picture of the butchered head.

[murdo]

Certainly been butchered.