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post #1 of 7 (permalink) Old 4-21-2017, 5:32 AM Thread Starter
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Tight spot in front disc

Hi all...


So about two or three weeks ago I noticed a slight tight spot in the front wheel (when checking the wheel for how smooth it was, it seemed to be tighter in about 1/8th of the rotation).


Since then it's got progressively worse, and when braking it would fluctuate how effective it was- so holding the lever at the same rate would produce hard and 'not so hard' braking as if it was hitting this tight spot repetitively.


I do about 400 miles a week minimum, so decided I'd just change the disc and pads and hope that solved it instead of putting it in a garage for a week (start of the season means all the garages are very busy).


Pads and disc changed, tight spot has been severely reduced but it's still there, I feel like I've not solved the problem.


I'm hoping anyone with more experience with these bikes could suggest what could be happening before I splash out having a mechanic look at it.


As always your expertise is appreciated
-----
Some context:
Checked the pistons in the front calliper, large one rises slightly faster than the small one, but they were level when I took the pads out and put the new ones in. Good movement in both.


Forks were changed by myself and a friend about 5000 miles ago.


Bike had a slow speed crash when I rear ended a friend, bike hit hers on my right, no damage that I could find other than I shredded my fairing when it hit the ground.
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post #2 of 7 (permalink) Old 4-21-2017, 6:51 AM
bpe
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Just a shot in the dark here. Is there a way you can check the run out on your front rim, i.e. could the rim have gotten slightly bent from the accident. Not that it probably matters , but do you have a single disc or a dual disc? How long between the accident, and when you started noticing the problem?

2006 Ninja500R Purchased new July 2006, 0 miles. Miles as of January 2017 88652. It is a GO bike, not a SHOW bike.
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post #3 of 7 (permalink) Old 4-21-2017, 6:59 AM Thread Starter
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Hi,


I can check by eye and see, but I think I would have noticed anything in my normal wheel checks, but I'll have a look tonight.


Probably about three weeks between the accident and noticing it, I can't rule it out but I can't see any damage except a slight chip on the fork so I'm not sure...


Sorry! Single disc, it's a 1997 D3 GPZ


Thanks
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post #4 of 7 (permalink) Old 4-21-2017, 10:33 AM
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The caliper should be serviced with every pad change, I know there's a write-up on how to somewhere around here, or the EX500.COM WIKI

It also has tips on checking disc, caliper bracket, etc....

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post #5 of 7 (permalink) Old 4-21-2017, 1:06 PM
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did you check the wheel bearings? if not do soo when you disassemble the caliper and clean it.

2007 Ninja 500r. R.I.P. 1990 EX500


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post #6 of 7 (permalink) Old 4-24-2017, 4:42 AM Thread Starter
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Hi,


I didn't service the calliper because it had only done about 4000 miles since it's last strip and rebuild, should I have done? Pads only got changed because of the disc change, the old ones were about halfway done...


Wheel bearings are solid so far as I can tell- is there any other way apart from checking the wheel for free play?


The bike has slightly notched steering head bearings, not sure if that contributes, but when it goes in to have them done I'll mention it and see if my mechanic has any insight- I'm taking the bike round Europe (a whole new set of questions loom) in just over a month so I'm having the bike checked over by a professional before I go


Thanks!
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post #7 of 7 (permalink) Old 4-24-2017, 12:18 PM
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plenty of miles for the caliper to get dirty.
notched steering stem bearings will give you headshake depending on the severity. upgrade to the tapered bearings.

2007 Ninja 500r. R.I.P. 1990 EX500


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