SOHC.co.uk Forums > CB750

Some Minor Issues to Sort

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McCabe-Thiele (Ted):
Final thoughts if it's definitely a front wheel area issue flags up the following ideas.
Is the wheel rim  & tyre completely  round - try some visual checks with the front end jacked up - rotate wheel check against best means you have of looking for ovality.

Fork oil change you already have in mind.

I've no experience of effects of wheel bearing wear aside from noise - the front brake will make wear difficult to check.

Probably stating the obvious so just trying to give you my thoughts.

Martin6:
Took it for a run in the sunshine.  New chain and sprockets are fine. I also re-checked the rear wheel, which looks true enough and I re-seated the new back tyre and confirmed wheel balance. There's still a wrong feeling, which I'm convinced now can only be from the front end. It's possible too heavy a firk oil. That's the feeling. I'll have a look at that on Wednesday.  I have some ATF I can use. I'll check the front wheel is true as well.

Nurse Julie:
Is there any change a fork, or forks, may be bent Martin?

Martin6:
Julie, I've wondered, but I don't think so. They seem to move smoothly, without any sticking when I pump them.

I decided to change the fork oil this evening:
The left fork had 200ml of oil and it was a little thicker than the 5W30 fork oil I've bought. It had some dark residue in the oil. The right had 160ml of ATF, which was clean. According to the >K4 supplement in the Honda manual, the correct amount for a K6 would be 155-165ml. 5w30, or ATF. So I put 160ml in both. Difficult to be sure, but I feel it is now slightly easier to pump the forks. At 200ml, perhaps the left fork was hydro-locking on poorer surfaces? On the other hand, 40ml isn’t much, so probably not.

I have a longer ride planned tomorrow, to go and see a friend's dismantled Suzuki GT185. 30 miles each way. A good chance to see if the oil change has made any difference.

Bryanj:
40mm on 160mm is 25% so its a big increase

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