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wobble at the steering, mini tank slappers on decel from 55

Started by mtc, March 31, 2019, 07:48:32 PM

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mtc

Quote from: RPM - Robert on April 03, 2019, 05:44:44 PM
Have you had a look at the steering head bearings and bearing races?


your'e killing me here ... the mere fact of tearing it down to the triple clamps makes me nauseous

41k miles, used but not abuse, kept ootof the sun, that is apparent

Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire

krusty

If trouble shooting a problem just do one thing at a time. Check and test tyre pressures, and, if problem persists, upgrade the tyres then see how things are. If problem still persists, take the next step, head bearing adjustment, whatever.
91 FJ1200
84 FJ1100 x 2
85 FJ1100
89 GL1500
76 CB750F1
72 CB350F
63 C92 x 2
59 C76
62 C100
63 C100
60 Colleda 250TA x 3
63 Suzuki MD50
77 DT125E
77 DT175E x 2
79 DT250F

Millietant

mtc - checking is pretty straightforward - put the bike on the centre stand, weight the rear end to get the front off the ground and grab the bottom of the forks. Pull the fork bottoms back and forth to see if there is any "play" that you can feel, or "knocking". If you're not sure, put the steering onto full lock each side and try the same pull each side.

If there's no undue/excess play, then your bearings aren't overly loose. With the front wheel off the ground, the handlebars should swing easily to both lock-stops, with no resistance or tight spots (if there are tight spots, you'll need to investigate further (just to see if adjustment/lubrication isneeded).

Assuming those check out OK (other than the triple clamps maybe needing to be disassembled and the bearings re-greased), then your wobble is nothing to do with the steering head bearings.

It costs nothing to find out, adjusting then is easy and you only need to spend money if your bearings are goosed.
Dean

'89 FJ 1200 3CV - owned from new.
'89 FJ 1200 3CV - no engine, tank, seat....parts bike for the future.
'88 FJ 1200 3CV - complete runner 2024 resto project
'88 FJ 1200 3CV - became a race bike, no longer with us.
'86 FJ 1200 1TX - sold to my boss to finance the '89 3CV I still own.

mtc

Quote from: Millietant on April 03, 2019, 07:20:55 PM
mtc - checking is pretty straightforward - put the bike on the centre stand, weight the rear end to get the front off the ground and grab the bottom of the forks. Pull the fork bottoms back and forth to see if there is any "play" that you can feel, or "knocking". If you're not sure, put the steering onto full lock each side and try the same pull each side.

If there's no undue/excess play, then your bearings aren't overly loose. With the front wheel off the ground, the handlebars should swing easily to both lock-stops, with no resistance or tight spots (if there are tight spots, you'll need to investigate further (just to see if adjustment/lubrication isneeded).

Assuming those check out OK (other than the triple clamps maybe needing to be disassembled and the bearings re-greased), then your wobble is nothing to do with the steering head bearings.

It costs nothing to find out, adjusting then is easy and you only need to spend money if your bearings are goosed.

ok i ck it when i got the front rim off for the tire
Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire

mtc

Quote from: mtc on April 03, 2019, 03:56:25 PM
Quote from: Bill_Rockoff on April 03, 2019, 03:20:21 PM

Higher pressure helped, and I was running ~40 psi up front (which didn't seem unreasonable, since the FJ is among the heaviest of bikes that will use most sporting front tires.) But after a while, the tire would be worn in a scalloped pattern and it would be a nightmare to ride.



got them up to 40 psi and it's much better, i can ride...
Current
1985 FJ1100

Previous Bikes
1979 Yamaha XS1100 best one
1984 FJ1100
1987 FZR600
1987 Fazer
1985 Vision
1982 Seca 750
1978 RD400 Spec II Motor

Live Life Wrong and Perspire