classic motorcycle forum

Motorcycle Discussions => British Bikes => Topic started by: hogboy09 on June 30, 2010, 05:41:42 AM

Title: Unit or non unit?
Post by: hogboy09 on June 30, 2010, 05:41:42 AM

I am the owner of a 1963 triumph trophy 650. my oil pump recently went out and while trying to order one i noticed i had to pick whether it was a unit or non unit engine. how do i know the difference?

Title: Re: Unit or non unit?
Post by: L.A.B. on June 30, 2010, 06:11:28 AM

Your 1963 engine's gearbox should be part of the same casting as the engine, this is "unit" construction.

Earlier 650 year models had separate gearboxes, this is known as "pre-unit" or in the US, occasionally known as "non-unit"  :-\ construction.

A unit 650 engine number would normally have a "DU" prefix (1963-1969).      

Title: Re: Unit or non unit?
Post by: hogboy09 on June 30, 2010, 03:22:36 PM

thank you very much! it is definitely a unit engine. much appreciated