December 30, 2017
Occasionally , my D14 front forks give a clonk on full extension.
For example my lane has some potholes and when the forks stretch I occasionally get a clonk.
Normal riding fine , bushes and seals and (sae20) oil fine and new , I'm assuming the damping on full stretch it what it should be.
Any thoughts please ?
November 6, 2016
Is your bike a D14/4 or a B175 model ?? this is important because the B175 forks will crash ( known fault), if the fork slider spacers are fitted the wrong way up or left out altogether. Especially noticeable when you ride off a kerb. Once you turn them around the problem will go away and you will have proper damping once more. If however your bike is a D14/4 (lightweight forks) then it is possible that something in the damper mechanism is assembled incorrectly. I am not an expert with the lightweight forks but somebody on this forum will have an insight or a solution I am sure.
Also ........ I have found that SAE20 oil in my forks gives a very soft ride and a 'dive' when I apply the front brake. This is very apparent on my A10 so I have changed the oil out for SAE40 on the A10 and the B175 and I now get a much nicer ride. This might be because the average bantam rider in my youth was about 9 stones soaking wet - but I ride at 15 stones plus my riding gear and helmet etc plus whatever kit I am carrying on my bike so its not surprising that the thinner oil doesn't cope so well.
Hope this helps
December 30, 2017
Thank you for thoughts,
D14/4 as far as I know ,
When I dismantled the forks to wash them out and rebush them , I was very careful on reassembly certainly - so hopefully everything in correct order .
I've got 1/8th pint of sae 20 as per book. The damping seems fine this weather as far as temperature and viscosity of the sae 20. But I can foresee the damping will reduce in the warmer weather for sure , so your thoughts of sae 40 sound sensible.
October 1, 2012
It would do. They only have one way damping, on compression. After a series of bumps the oil can transfer to the top of the forks allowing the forks to top out on the rebound. I used to get the same on the B31. BSA didn't come up with two way damping until the mid 1960's (on the heavy weights)
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