Triumph Pre Unit 650 Black Diamond valve/guide kit
Triumph Pre Unit 650 Black Diamond valve/guide kit
Kibblewhite Precision Machining

Triumph Pre Unit 650 Black Diamond valve/guide kit

Regular price $207.56 $0.00

Kibblewhite valves are the best you can get for your Triumph twin. Proven on the street, dirt, Bonneville Salt Flats, and race tracks everywhere, these are the legendary Black Diamond™ valves.

These forged stainless valves are specially impregnated which makes the stems incredibly hard and wear resistant. The reduced friction is also better than hard chrome or nickel plating. Nothing even comes close in terms of longevity.

When used with bronze guides and properly installed and finished, much tighter tolerances than factory can be used successfully for quieter operation, less friction, and much longer service life.

Please note that C630 Bronze guides are undersized and must be finish honed, (not reamed).

Manganese Bronze guides with (or without) seals are undersized but can be reamed to size.

Guides with valve seals are available but are only available in manganese bronze. The seals are supplied with the kit, seals will only fit guides specifically machined for seals.

This set consists of 2 intake valves, 2 exhaust valves, and 4 valve guides.
The intake valve head is 1.500" and replaced Triumph part number 70-3310, E3310 or Alpha V137.

The exhaust valve head is 1.343" and replaces Triumph part number 70-2904, E2904, or Alpha V138.

These valves can also be used in pre unit alloy heads (as oversize) to replace the 1.437" Intake and 1.312" exhaust.

THESE ARE ALSO CORRECT FOR MOST EARLY UNIT 650 HEADS UP TO 1966.

Also see the tech page for our helpful installation notes.

Please select the valve and guide sizes to build your own kit.


If you are building a Triumph 650 pre unit or early unit twin or need to rebuild a head, these are the highest quality parts you can use. We ship worldwide and will answer any questions you may have that are not covered in the installation notes.


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