Northlite pistons?

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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Northlite pistons?

Postby WnRn » Sun Sep 23, 2018 5:20 am

Pulling down my G80L and find the piston fitted is stamped on the crown with Northlite 66 REGD

I did google search and could only find one reference to Northlite pistons as being made by A.P.North.

Till I get a bore gauge and can measure that correctly I can only go by measuring the piston with is 83.5mm.

1 piston ring is broken.

So do I wait till I can measure the bore and then buy a piston to suit the bore or try to get rings that fit this piston.

The bore seems to be in good condition.
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Re: Northlite pistons?

Postby cfaber » Sun Sep 23, 2018 5:41 pm

WnRn wrote:Pulling down my G80L and find the piston fitted is stamped on the crown with Northlite 66 REGD

I did google search and could only find one reference to Northlite pistons as being made by A.P.North.

Till I get a bore gauge and can measure that correctly I can only go by measuring the piston with is 83.5mm.

1 piston ring is broken.

So do I wait till I can measure the bore and then buy a piston to suit the bore or try to get rings that fit this piston.

The bore seems to be in good condition.


Yeah you'll need a gauge to be sure, but one thing you can do is pull the rings off the piston and slide it mid-way down the bore and use shim gauges to figure out how far out it is (vs the measurement you get off the piston itself).

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