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General Category => Yamaha FJ1100 / FJ1200 Running Problems => Topic started by: Mike m on July 17, 2018, 04:57:35 PM



Title: Horrible vibration while cruising
Post by: Mike m on July 17, 2018, 04:57:35 PM
So Sunday I fueled up ive developed a horrible vibration while cruising.under hard acceleration its not thier at slow speeds it's not thier at 55/65 when i pull in the clutch and rev the engine.only at cruising


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 17, 2018, 05:04:31 PM
The vibration builds also as I get at 45mph transition to 55 mph its very noticeable and it'll follow speed increase.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 17, 2018, 05:13:49 PM
I had a new tire put on Saturday.Sunday morni g I increased the my rear spring to to make the rear a little stiffer


Title: Re: Horrible vibration while cruising
Post by: FJmonkey on July 17, 2018, 06:06:15 PM
Problem solving 101... What changes were made/done just before the problem started? A wheel out of balance will feel more out of balance the faster you spin it. I would check that first.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 17, 2018, 06:09:48 PM
When I pull the clutch its gone tho


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 17, 2018, 06:10:37 PM
Drive train related.too loose of a chain?


Title: Re: Horrible vibration while cruising
Post by: ryanschoebel on July 17, 2018, 07:04:50 PM
I had this same issue Mike, any time i got above 65, i would develop a really bad vibration and lugging. I got both tires replaced, and rebalanced, and the issue is totally gone, all the way up to 105( as fast as ive tried). Try that first,and then if its still there, i would lean towards maybe a chain issue, like the vibration of the engine is causing swinging? thats just a guess in the dark though


Title: Re: Horrible vibration while cruising
Post by: ZOA NOM on July 18, 2018, 10:19:29 AM
Stiff chain link is my guess.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 18, 2018, 03:53:48 PM
If I figure out the issue ill post.I'm to busy to mess with her.


Title: Re: Horrible vibration while cruising
Post by: JOMPPA10 on July 20, 2018, 10:34:20 PM
Problem solving 101... What changes were made/done just before the problem started? A wheel out of balance will feel more out of balance the faster you spin it. I would check that first.

mine has doing that vibration eversice i owned it is in 3-4 k vibration is hard under or up silky smooth
hope monkey can help


Title: Re: Horrible vibration while cruising
Post by: FJmonkey on July 21, 2018, 08:02:51 AM

mine has doing that vibration eversice i owned it is in 3-4 k vibration is hard under or up silky smooth
hope monkey can help

So you bought it and the vibration started.... Where to start?


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 21, 2018, 03:35:59 PM
So today I got free time and reolaced the steering bearings.I also changed oil switched to 15/40 Estella.I lubed my chain and adjusted lacked.I couldnt ride it up to speed 55/65 mph as rain was headed my way felt great at 45mph.I'm suspecting a rear wheel bearing.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 21, 2018, 03:39:50 PM
My swing arm bushings are well over due.I'm gonna order them tomorrow


Title: Re: Horrible vibration while cruising
Post by: Pat Conlon on July 21, 2018, 04:16:40 PM
Mike, FYI, the 84/85 swingers had nylon bushings which are no longer available.

You are lucky, on your '86 swinger linkage you have needle bearings, which are still available from Yamaha.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 21, 2018, 04:23:29 PM
Thanks pat.I'm sure rpm will have what I need.ive never takin off or serviced my swing arm.I dont understand why yamaha made the sterring head that way.I used my welder and welded a 1/4 bolt to the races.


Title: Re: Horrible vibration while cruising
Post by: Urban_Legend on July 22, 2018, 05:44:38 PM
Hey Pat

The swing arm on my 84 had needle bearings (yes it was the original item).


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 22, 2018, 05:47:46 PM
Maybe your swing arm isnt oem as senior members knowledge is holy grail.partzilla shows a 84 as have g needle bearings


Title: Re: Horrible vibration while cruising
Post by: Sparky84 on July 22, 2018, 08:23:16 PM
Hey Pat

The swing arm on my 84 had needle bearings (yes it was the original item).

Are You Absolutely Sure its the Only thing then..

For memory when I had my 84 apart this year for greasing of all linkages and replacement of bearings,
Swing Arm are Needle but Linkages are Nylon.


Title: Re: Horrible vibration while cruising
Post by: Pat Conlon on July 22, 2018, 10:02:09 PM
Maybe your swing arm isnt oem as senior members knowledge is holy grail.partzilla shows a 84 as have g needle bearings

Just so we are singing the same song.... I'm talking about the '84/85 swing arm linkage.

https://www.partzilla.com/catalog/yamaha/motorcycle/1984/fj1100l/swing-arm (https://www.partzilla.com/catalog/yamaha/motorcycle/1984/fj1100l/swing-arm)

^^^^ See parts #10 #15 and #21 Sure Looks like nylon bushings to me.

I've owned my '84 for a few years now, so I'm not dreaming this shit up.


Title: Re: Horrible vibration while cruising
Post by: TexasDave on July 22, 2018, 10:31:54 PM
Most of the Japanese bikes manufactured in the 70's and early 80's came with nylon swing arm bushings. I replaced the nylon bushings on my 1981 Yamaha XS650 with bronze ones from an aftermarket supplier. Does anyone make bronze replacement bushings for the early FJ's?

Dave


Title: Re: Horrible vibration while cruising
Post by: Pat Conlon on July 23, 2018, 12:24:29 AM
Don't know about brass replacements Dave.
Someone posted last week something about using needle bearings out of a Kawasaki or Honda as a retrofit for the Yamaha nylon bushings....

....Or just buy the linkage off a '86/87



Title: Re: Horrible vibration while cruising
Post by: Urban_Legend on July 23, 2018, 04:06:43 AM
 Could be my mistake. Not enough sleep and misreading your post. I know I had pin bearings as they ended up on my shed floor. But were from the main pivot point.it was 3 years and many other mods ago.

Mark


Title: Re: Horrible vibration while cruising
Post by: Pat Conlon on July 23, 2018, 10:28:47 AM
No worries Mark! All good..

I would like to do a write up on what to use for replacing the nylon bushings for the 84/85 folks.
 
Those bushings ain't getting any younger.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 23, 2018, 03:36:25 PM
I wasnt on the same page I think the shock linkage is what your refering to


Title: Re: Horrible vibration while cruising
Post by: FJmonkey on July 23, 2018, 05:25:47 PM
If I can get an old set of bearings I can see if the sizes are available from my bearing supplier. They have composite bearings that are better than the old Nylon ones of old. Anyone have a set I can borrow?


Title: Re: Horrible vibration while cruising
Post by: ribbert on July 24, 2018, 06:11:51 AM
I've long thought bushes (not nylon) would work much better here than needle rollers, like king pin bushes and for the same reason.

One of the problems is that the swing arm only rotates through a few degrees and as such leads to this sort of damage.

(https://c1.staticflickr.com/5/4384/35665217614_2a1f947722_c.jpg)

Noel



Title: Re: Horrible vibration while cruising
Post by: Old Rider on July 25, 2018, 12:55:28 PM
Did they balance the wheel? first i would check if there are some new weights on the rim if not they didn't.I have heard people saying that its not necessary to balance a motorcycle wheel that's bullshit!.
You can easily balance the wheel yourself just  take it off run the axlebolt Thru and hang it between 2 carstands or chairs hanging on the axle ends (it also helps if you have some old wheelbearings on the axle ).Then you rotate the wheel slowly and se if it have a heavy point .Then if it has you add balance weights on the opposite side (upper side) until its gone.Mayby a bad explanation but google it ...
I have had bad vibrations at higher speed that was caused by unbalanced wheel.


Title: Re: Horrible vibration while cruising
Post by: Mike m on July 28, 2018, 12:09:27 PM
As I orderd my swing arm bushing from rpm along with the brass bushing in the clutch handle assembly.I've dicoverd my vibration was from my #4 carb pilot jet had what I think is a piece of rubber from my fuel line in it.all's good