question for Andy Sochanik (navi barrels)

The barrels are cast as one piece - there is NO liner.

If, as Andy said, there were not any liners as original, what has Norville sold you???

Have you asked them about the confusion?

Mike

I do not think that there is any confusion as Michael suggests. The "standard" will refer to the bore size, in other words the liners bought from Norvil will take standard pistons. No doubt the barrel will need to be machined to accept the liners. This is normal. 

OK - I answered simply that the original engine does not use a liner.

The liner that Norvil are selling is to bring your engine back to STD size, once your barrels have gone beyond +60 rebore. The barrel is then bored out larger again, and a liner is fitted to bring it back down to size.

There is another reason for fitting a liner as well. If you have been unfortunate enough to have a malfunction where the bottom of the cylinder that is deeply spigotted into the crankase and has broken off, a liner will then provide a satisfactory repair.

I am currently using a Navigator that has a liner fitted to one side only - as on that side the circlip let go (the eye broke off), resulting in the gudgeon pin pushing the circlip against the cylinder wall and ploughing a huge gouge in it. The unharmed cylinder was still on STD size bore. So fitting one liner to the damaged side effected a repair and the bike is back on the road - STD on both sides!