SOHC.co.uk Forums > CB750
Handling
SteveD CB500K0:
Two things spring to mind:
Are you sure about the front tyre? A low speed wobble is usually indicative of an unevenly worn front tyre. My VFR did this (tankslappers at 30mph) and a new tyre fixed it.
Second, if you can feel every bump through the front suspension, have you cocked-up the fork oil? It shouldn't be like that. Was it you who put in the ATF or were you just told that it was so? Are the forks stiff when you bounce on the front with the front brake applied?
leonardo269:
Hi Steve,
There is nothing immediately apparent in terms of uneven wear, but I will have a good look at the front tyre when I get a chance. I suppose the best thing is also to jack the front end up, spin the wheel and check the wheel and tyre for wobble with a dial indicator.
Each Fork leg is filled with 150ml of Silkolene fork oil sae 10W, recommended to me by my local bike shop. What do you use?
The forks compress by about 40mm when they are pushed down with the front brake applied.
Thanks,
Ray
Lane:
Sorry to butt in here.
Check out your swingarm - the bushings may be shot. Put the bike on the center stand and grab the rear wheel at the top. Push HARD side to side - there should be NO side-play at all, I mean none.
Even when the problem is in the back like that, it's expressed through the front end, because the front end moves side to side so easily. So bad swingarm bushings can cause folks to spend a lot of time looking at the front end, when nothing is wrong up there.
Funky swingarm will definitely cause the symptoms you describe, and be be absolutely dangerous in a turn - the bike can start to buck like a horse sometimes. Like having a hinge in the middle of the bike.
Fortunately, it's a cheap fix, but a filthy, pain in the butt job to do.
bill
leonardo269:
Hi Bill,
I will check the swinging arm when I get a chance (my bike does not have the centre stand fitted, so I will need to jack it up to do this).
The swinging arm has only recently been rebuilt and the bush and spindle dimenions were within tolerance so I would think it unlikely, however I do take your point and I will check it out.
Cheers,
Ray
shifty_steve:
Hi, I also have a K7, with what sounds like the same problem, gone through everthing tyres, bearings forks, but never thought to give the swingarm a good check, almost feels like it starts at the back end but just been focused on the front, its been driving me mad.
Steve
[size=9]My first post, hello to all:) [/size]
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