Rolling front end twitch - Page 2 - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #11 of 20 (permalink) Old 04-26-2018, 08:05 AM
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2 things, if it were me iíd make sure that the steering head bearings are properly torqued, I just about bet theyíre not. That said I think ray has the proper diagnosis in that the rotors are not floating freely on the pins/rivets.

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post #12 of 20 (permalink) Old 08-04-2018, 04:51 PM Thread Starter
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Twitch

Hi Guys.

Just an update on the twitch problem.

I put the bike on the centre stand and applied a ratchet strap to one fork leg so I could pull it hard over to the stop to stop any movement.

I raised the wheel off the ground and put a heavy metal plate under the wheel, I then put my dial gauge onto the metal plate and took a reading from the rim of the wheel, both sides, tis was fine with no run out of any note.

I then moved my dial gauge to the disks and rotated them also to see if there was any runout, this was done with the pads pushed all the way back for both exercises to reduce any drag, again all was running true with only very minor deflection.

I then span the wheel looking along the front edge and there was a definite distortion of the tyre a bulge could be seen quite clearly, how crazy is that..........
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post #13 of 20 (permalink) Old 08-04-2018, 06:29 PM
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Rarely, folks report, and I experience, some pulsing under super light braking. Some mistake it for abs. I donít know what it is, but it is subtle, isnít related to abs, isnít indicitive of a problem, at least on my bike. Bar wag is a different issue entirely.

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post #14 of 20 (permalink) Old 08-04-2018, 06:56 PM
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Sounds like a belt might have broken in the tire carcass.

Ridden wet. Put up hard.

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post #15 of 20 (permalink) Old 08-05-2018, 05:00 AM
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Definitions Like Butter = smooth Twitch = Small unprovoked movement or Tic.
Just Queen's english.

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post #16 of 20 (permalink) Old 08-05-2018, 07:57 AM
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Cozza, thanks for the report back, sounds like you have a broken belt in that tire (tyre ?) , a little scary for a bike, what brand is that tire ?

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post #17 of 20 (permalink) Old 08-05-2018, 03:55 PM
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Originally Posted by Bill Lumberg View Post
Rarely, folks report, and I experience, some pulsing under super light braking. Some mistake it for abs. I donít know what it is, but it is subtle, isnít related to abs, isnít indicitive of a problem, at least on my bike. Bar wag is a different issue entirely.
Something like that occurs on my FJR at low speeds. I can not reliably replicate, but it does feel like ABS but not as violent. Been over everything the past 5 front tires and concluded, ďthatís just the way it is.Ē
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post #18 of 20 (permalink) Old 08-05-2018, 04:35 PM
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Quote:
Originally Posted by Cozza View Post
Hi Guys.

Just an update on the twitch problem.

I put the bike on the centre stand and applied a ratchet strap to one fork leg so I could pull it hard over to the stop to stop any movement.

I raised the wheel off the ground and put a heavy metal plate under the wheel, I then put my dial gauge onto the metal plate and took a reading from the rim of the wheel, both sides, tis was fine with no run out of any note.

I then moved my dial gauge to the disks and rotated them also to see if there was any runout, this was done with the pads pushed all the way back for both exercises to reduce any drag, again all was running true with only very minor deflection.

I then span the wheel looking along the front edge and there was a definite distortion of the tyre a bulge could be seen quite clearly, how crazy is that..........
I recently had that with a car tyre, but it was a fairly cheap one. How old are your tyres and how many miles has the bike done
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post #19 of 20 (permalink) Old 08-07-2018, 11:53 AM
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Sometimes I think the low speed vibes are transmitted from the tire tread hitting the road, other times I swear it had to be light ABS pulsing.

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post #20 of 20 (permalink) Old 08-09-2018, 02:53 AM
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Hi cozza, here's one that I found on my 06fjr, if I take my hands off the bars at any speed I always got the wobbles in the front tyre, the only cure was to balance my front wheel with new tyre and rebalanced again at 10,000 km due to uneven tyre ware
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