https://hagon-shocks.co.uk/product/cb750-k1-k7-33501cc1/
These are very good on my CB750K6. No bouncing or wallow, stable cornering and good protection from our (UK) crappy road surfaces. I'm no longer thinking about the rear suspension when I'm riding.
Do those have adjustment notches for heavier/lighter loads? I like the Hagon idea.
3 preload adjustments
I sent them a letter, will be interested to see what they come up with. I absolutely LOVED my Betor (Spanish-made, 1973) shocks until they flat wore out at 126k miles and no more rebuild kits survive for them. Mulholland made good ones (aka ORCA) and I have some from Terry (in AUS) that are great shocks, but have really bad, progressive-wound springs. If I could find straight-wound 118-lb springs for them I'd like these, but haven't had any luck in that regard.
I HATE progressive springs on the rear of these bikes, can't pull a straight line out of a curve, ever, with them on board. Here in CO there aren't many straight roads, either.
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Update after contacting Hagon: they only do progressive springs. I won't be using them on my 750.