Kibblewhite Precision Machining, Inc. is recognized worldwide as one of the premier manufacturers of motorcycle valvetrain components and is the choice of many demanding engine builders. This kit is comprised of Black Diamond coated valves and manganese bronze valve guides that feature a groove allowing the use of valve stem seals. The valves and guides are offered in various oversize combinations to suit cylinder heads that have been in service for many years. While considered suitable for the 1964-1978 T120 and T140 models, this set can also be fitted to many of the TR6 and TR7 models from 1966-onward, when the valve and valve seats were standardized for both the TR6 and T120 models. Not recommended as standard fitment for the early unit-construction 6T and TR6 models through 1965. Be sure to check your parts book to determine compatibility with your cylinder head.
The KPMI Black Diamond valves are impregnated by a special process that improves wear properties, reduces friction, and provides corrosion resistance. Both the inlet and exhaust valves are available in standard or oversized head diameters depending on the fitment requirements. The KPMI manganese bronze valve guides are also supplied in standard .501″ OD and various oversizes up to +.004″. Valve stem seals are optional with the updated design of the guides. Use the drop down menu to select your desired specifications when ordering valves and guides.
Since most unit-construction Triumph 650 cylinder heads are interchangeable, with variances in tappet guide blocks, pushrod tubes, and sealing arrangements, it is possible that a later head can be installed on an earlier cylinder barrel (and vice versa), so head identification is necessary. A casting number will be visible within one or the other rocker box pockets on the cylinder head. A circle with a two-digit number indicates the year the cylinder head was cast but may apply to more than one model year. It is advisable to remove the valve guides from the cylinder head prior to ordering replacements to allow for inspection of the bores and measurements of the previous guides. This set of valves and guides are suitable fitment for all of the 750 twins from 1973-1978.
As is the case with many advanced service procedures on motorcycle engines with decades of service, careful measurements must be made prior to selecting the optimally-sized valves and valve guides. The size and concentricity of the valve guide bores and condition of the valve seats must be considered, and it is strongly advised to consult a professional machinist for accurate measuring and final finishing of the valve guides and valve seats prior to assembly of the valve train components. Consult the factory workshop manual applicable to the cylinder head’s model year for fitment specifications.
FROM KIBBLEWHITE All KPMI Black Diamond™ stainless steel valves are impregnated by a special German process to a depth of .002”, with a surface build up of .0002”. This “Black Diamond®” process improves wear properties, reduces friction, and provides resistance to corrosion and wear that is superior to chrome and nickel electrolysis plating. Each valve is designed using Finite Element Analysis software, and profiles are tested on our computerized flow bench. Black Diamond® Valves are light, strong, one piece forgings with profiles that provide excellent flow characteristics.
Triumph Kibblewhite Diamond Valve Guide Set 70-2904 specs
Standard set consists of the following parts suitable for Triumph unit 650 & 750 heads up to 1978. This set will also fit some pre-unit triumph 650 twins, check your parts book for compatibility.
Two (2) inlet valves, Triumph PN# E4603 or 70-4603- select standard or oversize
excellent flow characteristics.
Triumph Kibblewhite Diamond Valve Guide Set 70-2904 specs:
- Standard: head diameter…..1.600″ / 40.64mm . Stem diameter…..0.3105″. Tulip…..1.5″ radius. Overall length…..3.850 ”
- Oversize: head diameter…..1.660″ / 42.16mm. Stem diameter…..0.3105 “. Tulip…..1.5 in radius. Overall length…..3.830 ”
- Two (2) exhaust valves, Triumph PN# E2904 or 70-2904, KPMI # 70-4230.
- Standard: head diameter…..1.440″ / 36.58mm. Stem diameter…..0.310 “. Tulip…..24 º. Overall length…..3.78 ”
- Oversize: head diameter…..1.500″ / 38.10mm. Stem diameter…..0.310 “. Tulip…..24 º. Overall length…..3.76”
Four (4) manganese-bronze valve guides to replace Triumph PN#’S, E2899 or 70-2899, E2900 or 70-2900, E3827 or 70-3827, E3828 or 70-3828, 71-3294 & 71-3295, KPMI 70-0331s.
Standard size valves and guides are supplied unless otherwise selected. Please use pull down menu to select oversize valves &/or guides
All machine work should always be performed by a qualified machine shop!
The product images shown are for illustrative purposes only and may not be an exact representation of the product received. Manufacturers occasionally make minor cosmetic changes to items, such as color, finish, label, or design. These changes do not impact the item’s function or compatibility. Please contact us if you have specific concerns regarding appearance.
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