Vibration Survey for Owners of More Than One FJR1300

[Constant Mesh]

"Throttle body sync works only to smooth the idle and at about 1500rpms+/-..

Above that range has not any effect in vibrations..My opinion..."

I can't agree with this.

After I make adjustments I always note a lessening of vibration all the way up to 3.5K rpm.

I know how well I've done by how smoothly it shifts gears. A good sync has a noticeable effect on shifting.

I can tell if it needs a sync by how well it shifts. It's a leading indicator.

I may get better syncs than some because I use an oil-filled manometer. It's more sensitive than my mercury balancer.

 

[roger dodger]

Like many... I came from a C10 Concours... so we USED to have some vibration.

My 03 FJR is still smooth as can be @ 80k miles. It has (slightly) higher gearing so high speed seems to show higher vibes, but nothing difficult (during many long trips).

My 13 is SMOOTHER YET... but has lower gearing (for a 5 spd) so it seems smoother too. Compared to the 13, the 03 seems lighter, smaller, and a little more visceral.

Neither bike has had a TBS. The 03 never needed anything more than valves and plugs every 30k or so... and it's quicker too.

 

[Ditch]

Throttle body sync works only to smooth the idle and at about 1500rpms+/-..Above that range has not any effect in vibrations..My opinion...

I did ride three fjr,a 04,05,08 and they have exactly the same vibrations..

Please, please! Don't NERP my thread

 

[Kaelaria]

'06 and a '14 - both perfectly smooth, I do regular TBS.

 

[BanjoBoy]

Throttle body sync works only to smooth the idle and at about 1500rpms+/-..Above that range has not any effect in vibrations..My opinion...

I did ride three fjr,a 04,05,08 and they have exactly the same vibrations..

Please, please! Don't NERP my thread

Why not, NERPTs the most interesting part of this forum.

'N to the above comment, as I recall, last time I dun synced my TBs, I set the throttle to 4K, 'n adjusted the butterflys, then the idle. Prolly why mah bike's smooth as an electric motor.

 

[Ditch]

Throttle body sync works only to smooth the idle and at about 1500rpms+/-..Above that range has not any effect in vibrations..My opinion...

I did ride three fjr,a 04,05,08 and they have exactly the same vibrations..

Please, please! Don't NERP my thread

Why not, NERPTs the most interesting part of this forum.

'N to the above comment, as I recall, last time I dun synced my TBs, I set the throttle to 4K, 'n adjusted the butterflys, then the idle. Prolly why mah bike's smooth as an electric motor.

This is what concerns me about buying a Gen III and getting stuck with a buzzy one I can't adjust.

 

[HyperPete]

This is what concerns me about buying a Gen III and getting stuck with a buzzy one I can't adjust.

I am confused. Is there something about the 3rd and 4th gen bikes that prevents TB synchronization?

 

[Ditch]

The ride by wire allows you to sync the tb's but not the throttle plates, which is that reduced actual vibration

 

[HyperPete]

The ride by wire allows you to sync the tb's but not the throttle plates, which is that reduced actual vibration

Ah, OK, that makes sense. Thank you for the education!

 

[Bill Lumberg]

My 14 was like glass. I didn't know what food meant when they talked about vibes. Yamaha had to replace my throttle body assembly. Now I understand. It's not bad, but I've got vibes in the bars now. Night and day difference.

 

[Ditch]

My 14 was like glass. I didn't know what food meant when they talked about vibes. Yamaha had to replace my throttle body assembly. Now I understand. It's not bad, but I've got vibes in the bars now. Night and day difference.

So it's all in the TB's, amazing. Where is the quality control at Yamaha? I wonder it they're even aware of the variance in vibration levels.

 

[Constant Mesh]

Engine vibration on the FJR has very little to do with the engine air flow.

Syncing the air flow can have a small, marginal effect on vibration.

Most of the vibration is just a built-in feature of the engine. They tried to control, limit the vibration with the inclusion of the two balancing shafts. But, as with most things, they couldn't locate them in the most optimal positions for maximum effect.

As compared to in-line four car engines the FJR engine is firmly bolted to the frame so the transfer of vibration forces isn't controlled with energy absorbing engine mounts like those used in cars.

 

[Ditch]

Then why is there such variation between FJR's?