SOHC.co.uk Forums > CB500/550
550 F2 started!
Laverdaroo:
--- Quote from: Oddjob on December 31, 2021, 06:52:42 PM ---I was wrong, memory is starting to fail ;D 10 psi for the forks and he says fit 3 washers (but doesn't say how thick they are) in the forks so they effectively preload the springs. So I'd say say 5-10mm of preload. My springs are mismatched in length, so what I'm thinking is to fit the springs etc, no preload at all, place a heavy weight on the top of the fork top, maybe my old vice, measure to see how far it compresses the fork and mark it. Do the other fork and then match the preload so they both compress the same distance. Not sure if that's the correct way but it makes some sort of sense.
Trim those screws into the inlet manifolds, measure the bores of them all and see if they match, if not make them match, smooth out any casting marks, rough spots etc. Should get another 5bhp doing that without affecting engine response.
If you want a little more power, get the cam lobes modified, no more lift, just more duration. So 5 degrees of overlap and 10 degrees of duration. Engine won't be cammy with such a mild mod. Think I have a spare cam so may just try that one.
--- End quote ---
Id like more of a chat about the cam scenario as that sounds like an easy win for little faff but not opened her up yet, for all i know the lobeson mine will be past repair or similar. Nice one on the sfork DIMS Ken, thats brilliant.
Oddjob:
Doesn't really matter about the lobes Roo, they will be repaired as the difference is made to them.
As for the spring, get the part you need glowing red, bend it into the new shape and let cool, you should be able to adapt the K3 spring to match the F2 one I reckon with a little work, replate afterwards.
Laverdaroo:
Do you think although it's a coil less than the spec one, it'll be sufficient?
I had thought about it. I also emailed a company about making some and see wht they say. If anything because of their name. I kid you not... FLEXOSPRINGS, Bristol.....Brilliant, does exactly what it says on the tin ;D ;D
I know they get reground but as I mentioned, It'll just be my luck that they'll be shagged out in a place thats unrepairable! ;D I'd like to have that chat though at some point. I've had nothing to do with modifying engine internals but only from never having to before. Fully converse with the whys and the benefits etc but not had much to do with it. It's always been two stroke tuning and 4 stroke resto so never approached the tune side from differing internals.
I'm off to get the frame from wakefield in the morning but when I get home I'll maybe have a go at that spring with the gas bottle and torch. Thanks mate.
Oddjob:
Looks enough metal on the other spring to make another loop to match the F2 spring Roo. Just find something the right diameter to bend it round.
Laverdaroo:
Gonna have a go on a hot Ken, only just got back from B’ham to finally get my hands on the frame that I bought of Phil back in November!!!
Anyway WHOOP WHOOP! Next stop, the blasters.
Cheers Phil by tjecc be way, it’s a little cracker and no tin worm anywhere, thanks heaps for supplying such a good starting point mate, you’re a ledge
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