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Royal Enfield Interceptor - Knowledge Base
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| Unless stated otherwise, the information in this Knowledge Base is for Royal Enfield Interceptor only. Some information could of course be applicable to other models. |
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Some year ago I gave my Interceptor a set of new valves.. later I
found out the exhaust valves were wearing very fast in the guides.
When I looked better I found out that the valve geometry wasnt quite
right.
The exhaust valves were 2 mm longer than they should and that meant that the rockers were hitting them off center and pressing them to the top / side. So I turned off 2 mm on my lathe and replaced the spring on the rockershaft with some shims to get a minimal play to the sides. Paulus This is a more common problem on Brit bikes than most people believe
... Correct rocker geometry is achieved when the valve is at half lift, at which time an imaginary line through the center of the valve adjuster tappet should pass exactly though the centerline of the valve stem. Achieving this state usually calls for adjusting valve length, and or the length of the push rods (Did you know that there are at least 3 different push rod lengths used on Enfield twins ?) Getting the hardened ends off the push rods is not easy, and to so I built a special jig/tool that fits in my press. A bit of a fiddle, but the results were well worth it on my Series 1A, Another tip: take care not to mix up the push rods. Once the mating ball & socket ends have worked in together in a particular way, they will be too loose or too tight if mated with other parts. I measured some with radius gauges, and was quite surprised by the variances in radius from one ball & socket to another. This probably accounts for why some top ends are noisier than others. .. gREgg |
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Some year ago I gave my Interceptor a set of new valves.. later I found out
the exhaust valves were wearing very fast in the guides. When I looked
better I found out that the valve geometry wasnt quite right.
The exhaust valves were 2 mm longer than they should and that meant that the rockers were hitting them off center and pressing them to the top / side. So I turned off 2 mm on my lathe and replaced the spring on the rockershaft with some shims to get a minimal play to the sides. Paulus This is a more common problem on Brit bikes than most people believe
... Correct rocker geometry is achieved when the valve is at half lift, at which time an imaginary line through the center of the valve adjuster tappet should pass exactly though the centerline of the valve stem. Achieving this state usually calls for adjusting valve length, and or the length of the push rods (Did you know that there are at least 3 different push rod lengths used on Enfield twins ?) Getting the hardened ends off the push rods is not easy, and to so I built a special jig/tool that fits in my press. A bit of a fiddle, but the results were well worth it on my Series 1A, Another tip: take care not to mix up the push rods. Once the mating ball & socket ends have worked in together in a particular way, they will be too loose or too tight if mated with other parts. I measured some with radius gauges, and was quite surprised by the variances in radius from one ball & socket to another. This probably accounts for why some top ends are noisier than others. .. gREgg |
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