Hi
This bike had a replacement head within the warranty period which I assume is the one I am dealing with and need some help please.
I have just stripped out the valves and rocker spindles, noting the way the spindles came out in relation to the oil ways, the 2 exhaust oil ways are as per the manual facing the inspection cover, but the 2 inlet oil ways were the opposite to each other, reading the manual is a bit confusing if I am correct the 2 inlet oil ways should be facing down towards the inspection cover?
When I took the exhaust valves out each had an insulating washer under the spring holder, as per the parts manual, here is the confusion when I took off the inlets spring holders there are no insulating washers under them, the parts manual I have says all heads except the RH1 should have an insulating gasket fitted.
Your comments please.
All the rocker shafts have…
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Consideration-the Combat h…
Consideration-the Combat had a lowered head for higher compression ratio. Therefore the push rods became 'too long' so they removed the heat insulation washer to stop the valve springs being coil bound. Sounds like a bodge to me (nothing new there). So why hasn't any one thought of getting the pushrod length correct? That just might have got some more power and not cooked the inlet springs. But then the Norton valve geometry was always rubbish, don't mention the de-sax!
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All the rocker shafts have the holes pointing to the covers, this limits the oil flow to the correct amount, turning the other way gives too much oil. As long as your cam etc is standard then use insulating washers, they were left out on the combat to stop the springs going coil bound. You can assemble with and then turn the engine over slowly to check you have sufficient space between the coils at full lift before committing in case someone has say planed the head.