C90Club.co.uk

Got one of these the other day, Fits both bikes,
I thought the 10mm part might stick through and let the piston give it a clout, But its no where near,

Bargain at £5.99 free post.

http://www.ebay.co.uk/itm/Draper-10mm-1 ... 2241389069?

thanks

Does the extra protrusion into the combustion chamber make the compression reading higher as its reducing the compression area and therefore increasing the compression ratio

loadedtoad wrote: ↑

Sat Jul 01, 2017 10:24 pm

Does the extra protrusion into the combustion chamber make the compression reading higher as its reducing the compression area and therefore increasing the compression ratio

Good Question,
When i screwed it into the CG head the extension sat about flush with the threads when screwed in, All i can think of is that the CG spark plugs have a longer reach thread, So they made this shorter and the 10mm extension compensates.