Fork shock adjustment? - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 3 (permalink) Old 10-14-2013, 07:48 PM Thread Starter
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Fork shock adjustment?

Last weekend I did a short 125 mile ride. Paved backroads, county highways, and main highways. On the backroads, when I ride over a bump. There is a knock in the front end, and the ride is a little jarring. Like a preload problem? Looked at the travel marks on the forks, seems with riding and braking. I'm using 3 inches of travel in normal riding ( too much, not enough?). Adjustment? springs worn?
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post #2 of 3 (permalink) Old 10-14-2013, 08:34 PM
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I'm guessing not enough. May need to have the fork oil changed. I put progressive springs in mine and it is night & day.

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post #3 of 3 (permalink) Old 10-15-2013, 10:55 AM
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I just went through the same issue.
Check your neck bearings by jacking the front up off the ground and seeing if they are smooth and no side play in the neck. Grab the bottom of the forks and see if there is any front back play as well. Some bearings will have play when the steering is straight ahead, but be OK in other positions because the bearings become worn or "notched" in the normal position of driving straight lines.

Also check the tighness of the neck. tighten the neck adjustment so there is no up and down play in the steering neck. Then with the front wheel off the ground....turn the handlebars slightly off center and loosen the adjustment untill the bars turn on their own and fall away from center.

I did all this and still had the same problem so I knew it was internal to the forks. I drained the forks and flushed them with Automatic Transmission Fluid, then added a heavier oil to the forks. I used 20 weight fork oil....the stock oil is very thin (maybe 10W).

Replacing the fork oil helped a lot with the dampening, but eventually I plan on changing the springs to the progressive type.

Preload is not adjustable other than adding some length to the spacer inside the forks....but not recommended.

Last edited by kc2dgq; 10-15-2013 at 10:59 AM.
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