SOHC.co.uk Forums > CB750
Some Minor Issues to Sort
K2-K6:
Interesting to hear outcome with forks, hopefully positive.
As Bryan noted, its quite a big shift in air volume as it changes much more in ratio through the travel when you start with less space above the oil. Effectively it's making a more concentrated ramp up in spring rate from the resulting air chamber being decreased in size.
One of the reasons I favour a dedicated fork oil like Motul is because it can be more optimum in regard to stiction which is prominent in sliding bearings. ATF is a good balance, but very tighly controlled for it's finite friction properties to ensure consistency in the auto transmission clutch packs, has good anti foam properties too. Dedicated fork oils don't need that friction consideration and generally outperform in that regard. It does make even an old fork perform the best I've found when used.
Martin6:
Sadly, no improvement today. Definitely feels like the suspension, as it is not rhythmic, more a disruptive patter, on uneven surfaces. Guess I'll have to remove the forks and check them.
Also, the throttle has started hanging open again. I think that's the damage to the slide/bore on carb no.4. This bike is fighting me. :)
Oddjob:
Any chance the tyre isn't fully on the rim all the way around.
Martin6:
Good prompt. I'll check the wheel and tyre first.
How are you all lifting the front end off the ground? I don't have a bike lift. At the moment, I'm putting a block of wood on a car hydraulic jack, bike on centre stand and lifting with the jack under the sump. Is the sump strong enough? It feels a bit hairy and I'm unable to strap the bike to anything. On my Norton I can easily weigh the back of the bike down, which lifts the front just clear of the ground. The C of G on the Honda doesn't allow that.
Laverdaroo:
If you’re struggling throw a ratchet strap over the back with the centre stand whilst its on a block of wood and screw either end of the strap to the floor with a couple of big washers so they don’t pull through. You can lock the back down as far as you like.
Bit of a cowboy ‘get out of jail free’ card but it works
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