850 max bore - what then?

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Nikasil works well on an iron bore. It wears better than iron and dissipates heat better than sleeves.

Nitriding also works but you can not repair a worn or damaged bore -only make it more wear resistant.

Sleeves are spun cast in either gray iron -similar to the original barrel without the porosity problems of gravity cast
or
Nodular iron which is much stronger and more wear resistant than gray iron.
Nodular iron liners are tough on standard Norton iron piston rings but work well with chrome rings.
I just installed a pair in Sir Eddies Rocket engine.

.080 over pistons are fine in most 850 barrels but some barrels with a little extra core shift may end up with thin spots or cracked spiggots.

Sounds interresing this, but for me it comes down to what the cost will be. Turns out noone here in Sweden does Nikasil treatment, they send th barrels to the UK or some other place in Europe. And sending this 9 or 10 kg lump back and forth won´t be cheap.....But then again nothing is, so....:(
 
Sounds interresing this, but for me it comes down to what the cost will be. Turns out noone here in Sweden does Nikasil treatment, they send th barrels to the UK or some other place in Europe. And sending this 9 or 10 kg lump back and forth won´t be cheap.....But then again nothing is, so....:(
Have a look https://www.revaltec.com/en/
they do it for iron bore , but no idea fro shipping cost.........
 
I would agree regarding the Taiwanese Hepolites. I put a set into a T150 a few years ago & as always I measured & weighed them first. They were all the same dia. to within 0.0002", all the same weight & also beautifully machined. The rings on the other hand were crap. The engine smoked badly so I fitted a set of rings from Norman Hyde, Goertze I think, & the smoking stopped.
I sold the bike to a friend & it is still running perfectly after many miles.

Martyn.
this has been found by others...change the rings for better quality before use!
 
Sounds interresing this, but for me it comes down to what the cost will be. Turns out noone here in Sweden does Nikasil treatment, they send th barrels to the UK or some other place in Europe. And sending this 9 or 10 kg lump back and forth won´t be cheap.....But then again nothing is, so....:(

Just bung the +.80” pistons in and ride it !!
 
this has been found by others...change the rings for better quality before use!
as martyn said and in France some people use Goetze with a very good feedback ......sometimes ago B.Bogus said he had good experienvces from them and could give us any suppliers in UK.....
 
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