Triumph Pre Unit 650 Black Diamond valve/guide kit
Kibblewhite Black Diamond™ valves are the best you can get for your Triumph motorcycle. These valve sizes were made specially for the early 650 unit and pre unit heads that use a 1.500" intake valve. These specially impregnated forged stainless valves have proven to have superior wear resistance and reduced friction than that of hard chrome or electrolysis nickel plating. When used with these C630 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 may be reamed or honed to size.
Positive valve seals are optional but can be ordered with modified C630 guides at no additional charge. When installed with the recommended .001" clearance a seal will not be necessary.
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 below 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.