SOHC.co.uk Forums > CB750
Some Minor Issues to Sort
Oddjob:
I got the missus to sit on the back of the bike whilst on the main stand. I measured the gap between the bottom tubes and the floor, 2 pieces of wood screwed together to form a letter H with the brace close to the floor so it clears the exhaust headers. Now she sits on the bike, I push the H underneath and it sits like that no problem. Scrap wood can be used as well. I had some offcuts of 3x2 and found them ideal.
Laverdaroo:
Didn’t have any off cuts suitable at the time
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philward:
--- Quote from: K2-K6 on April 18, 2023, 09:24:10 AM ---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.
--- End quote ---
I wasn't happy with the fork action (picked up all the little undulations) on my 500 and following asking about suggested improvement, Nigel (K-K6) suggested a thinner Motul fully synthetic 2.5w fork oil and there a great marked improvement in normal riding - bearing in mind I'm not a footrest scraper anymore!
Martin6:
Thanks all. I thought 5W30 would be light enough. It seemed lighter than the ATF I have. I'll give the 2.5 a go if I rule out everything else.
I would appreciate some advice on the top steering bearings. It swings fine, left to right. Just wonder if the top housing in the photo is correct. It has a 6mm recessed section showing below the bearing cap. It looks odd, is that the way it is meant to look? Can't see a photo in the manual.
I'm still working out the safest way to lift the front wheel off the ground!
In the meantime I've checked the carbs again. Two of them were pretty stiff and scoring the slide cylinder. I bit the bullet and worked on the scuffed areas with emery cloth. Required a few attempts, but now they slide reasonably smoothly. Be interesting to see if I've ruined the vacuum. No choice really, the throttle was sticking open. :(
McCabe-Thiele (Ted):
Although I have a bike ramp I use one of these on the ramp.
Other makes & prices are available.
.https://www.ebay.co.uk/itm/203603502986
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