NORTON ENGINE PARTS
Stainless Rocker Oil Feed Lines - We offer two variations of braided stainless lines to replace the Commando's original plastic one:
Our best is composed of 3 stainless lines, 3 banjoes, a "T" junction and two banjo bolts. All three lines are connected to the "T"
junction, which is positioned above the head. One line runs down to the crankcase and one each to the rockers. All the fittings,
including the banjo bolts, are of stainless steel. - #C206
A less expensive version has two stainless lines with chrome-plated
banjoes on each end and includes one single and one double chrome banjo bolt.
Both lines are connected to one rocker arm. The other end of one line runs to
crankcase with the second line running to the other rocker.
Oil Line Kit - #C207 Replacement Single Banjo Bolt
- #C207S Replacement Double Banjo Bolt - #C207L
| Anti-Drain Valve - For years Velocette successfully used a check valve
in their oil tank to prevent "wet sumping" when the bike was not used on a
regular (daily) basis. We offer two "in-line" check valves that are
suitable for Nortons and most other British machines and safe for use on
any engine with an oil pump in good condition. Simply insert the valve
in the feed line between the oil tank and engine and forget it. The upper valve in the photo is the one we have sold for well over a dozen years. It is simply an in-line version of the one used by Velocette and they actually supplying the internal parts. Worried about oil flow? Simply install a clear line between the valve and engine and give a quick look when you start the bike (or fit a pressure gauge which warns of other problems also). #N201 The bottom valve is a MCB version. To protect the engines, it is designed to default to the "off" position in case of failure and incorporates a glass window so oil flow can be observed when the engine is running. #N202 |
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IN/EX Valve Adjusters – Two variations on the stock adjusters are
available.
Set of four adjusters with "Allen socket" opposed to square tops and lightweight aluminum lock nuts. - #N200
Set of four adjusters with an oversize (mushroom) valve contact area.
These are US made and the best we've seen. The oversize head both eliminates
point pressure/wear on the valve stem that can lead to false settings and
compensates for misalignment between the adjuster and valve head. The top
is slotted for screwdriver adjustment. This design eliminates the weakness found
in some "allen" top designs and also prevents forcing the adjustment without
completely loosening the locking nut. - #N197
Racing Valve Springs – When 650/750/850 models are fitted with a performance cam that requires "racing" valve springs we only recommend the R/D kit which includes titanium, instead of aluminum, retainers and uses the factory steel keepers (not supplied). - #N195
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AMAL Singe Carb Conversions– We offer complete kits to
convert your 750 or 850 Commando to a single 34MM Amal MK2 carburetor.
Aside from being the same make as the original carbs, these kits offer
the advantage of readily available spare parts, being easy to tune and
that they can be serviced by any British bike shop. Each pre-jetted kit
includes a single carb manifold, MK2 carburetor, air cleaner and
throttle cable. Some fine-tuning or re-jetting may be necessary.
Commando 750 Kit - #F304 Commando 850 Kit - #F305 Manifold only - #F309 |
Pistons & Rings - Pistons for the 750/850 Nortons are available from Hepolite, GPM (current factory piston from Italy) on special order and from Cycle Craft in Taiwan. Pistons for the 500, 600 and 650 twins currently supplied by the “Factory” are by GPM. All of these pistons produce the original compression ratio. Hepolite and GPM piston sets come with their own rings. Cycle Craft pistons come without rings and for normal street application the we suggest the U.S. brand when available. They seem to work well and are the least expensive. Cycle Craft pistons have proven very reliable on the street and are much less expensive than the other brands. See the Norton Factory Parts page for current prices.
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750 Piston Set -
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Std. GPM 06-7055 | Cycle Craft - 06.7055T | |
| +.020 GPM 06-7056 | Cycle Craft - 06.7056T | ||
| +.030 GPM 06-7109 | |||
| +.040 GPM 06-7057 | Cycle Craft - 06.7057T | ||
| +.060 GPM 06-7110 | Cycle Craft - 06.7110T | ||
|
750 Ring Set -
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Std. GPM 06-7058 | Hastings - 06.7058H | US made - 06.7058A |
| +.020 GPM 06-7060 | Hastings - 06.7060H, | US made - 06.7060A | |
| +.030 GPM 06-7122 | |||
| +.040 GPM 06-7062 | Hastings - 06.7062H | US made - 06.7062A | |
| +.060 GPM 06-7123 | US made - 06.7123A | ||
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850 Piston Set -
|
Std. GPM 06-3838 | Cycle Craft - 06.3838T | Hepolite - 06.3838B |
| +.020 GPM 06-4041 | Cycle Craft - 06.4041T | ||
| +.040 GPM 06-4042 | Cycle Craft - 06.4042T | ||
| +.060 GPM 06-4043 | Cycle Craft - 06.4043T | ||
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850 Ring Set -
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Std. GPM 06-7958 | Hastings - 06.7958H | |
| +.020 GPM 06-7960 | Hastings - 06.7960H | ||
| +.040 GPM 06-7225 | Hastings - 06.7225H | ||
| +.060 GPM 06-7226 | Hastings - 06.7226H |
Commando 750 Cylinder Upgrade - Finally, a cast iron replacement cylinder for 750 Commandos with the "through bolt" design of the 850. This is an excellent choice for those building high performance engines - heavier than the aluminum versions but stiffer, considerably less expensive and much more reliable. Available in very limited quantities. - #C210
Norton Camshafts - We can supply factory and Mega Cycle camshafts on special order. We hope to have the specs and prices on-line in the near future but in the meantime you can call for details.
Racing Crankcase - The crankcase used on the Norton twins have been redesigned and strengthened several times as the engines displacement and power output were increased. However, even the late Commando crankcases would fail often enough under racing use that a number of firms offer a service to modify/strengthen them. The factory has addressed the problem by both redesigning the cases (thicker material, heavier bosses, etc) and casting them in a higher-grade aluminum (we're told it's 25% stronger). These cases are strongest available and fit both 750 and 850 models. They are available either machined to accept a primary cover and alternator or as a race only version without this machining to leave even more material around the drive side bearing. Special order/Limited availability. See our Norton Factory Parts page current prices. - #06-4045
Stainless Steel Sump Filter Body - The early Commandos, as did the previous heavy weight twins, used a large diameter filter in the sump. This filter was eliminated on the later 750 models and reintroduced with the coming of the 850s. The factory filter body was #NM16945 / 06-7676. Our version is of stainless steel, opposed to the original brass or the current factory cad plated steel, and has been modified to accept the factory magnetic sump plug. Adding the plug provides another form of engine protection for early models without it and also makes draining the sump less cumbersome. The internal parts for the filter are also available if needed. Filter Body - #N160 Magnetic Plug - #06-4188 Plug Sealing Washer - #06-2624
Commando MK3 Blanking Plate -Some become so frustrated with the Commando's electric starter they remove it. This alloy plate covers the hole left when they do so. - #C299
Oil Filter Mount - If your bike was not fitted with an oil filter by the factor, this universal filter mount will solve the problem. - #U210
Commando Oil Filter Kit - For early Commandos that came without an oil filter, the Factory offers a complete kit – mount, filter, oil lines, etc. – to upgrade to the later spec. See the Factory Parts page for price - #06-4283.
Universal Oil Cooler - Ideal for racers and other bikes with high performance engines or that must operate in warmer climates. Readily adapts to most British models. - #U211
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