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Old 04-04-2014, 09:16 AM   #511
Cortez
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Quote:
Originally Posted by cpallen View Post
and completely accurate assessment.
Well then, these vibes are a very subjective thing then (not their existance
obviously but the fact if they bother you or not).

I couldn't take the 180 crank in my twin, I like the 270, I gotta try the 360!

I wish they went the 315 deg route like Husky Nuda tho, everyone says that's
a great improvement on the engine, but I guess sound is more important to them.
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Old 04-04-2014, 09:28 AM   #512
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Quote:
Originally Posted by Cortez View Post
Well then, these vibes are a very subjective thing then (not their existance
obviously but the fact if they bother you or not).

I couldn't take the 180 crank in my twin, I like the 270, I gotta try the 360!

I wish they went the 315 deg route like Husky Nuda tho, everyone says that's
a great improvement on the engine, but I guess sound is more important to them.

I'm not sure how I'll feel about the vibes after 10 days on the bike, the Scotland trip will be very revealing. I expect it to be great on the little single-track roads, but we'll see. In my experience, vibes are very, very subjective...

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Old 04-04-2014, 09:57 AM   #513
Cortez
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Originally Posted by kickstandsup View Post
I'm not sure how I'll feel about the vibes after 10 days on the bike, the Scotland trip will be very revealing. I expect it to be great on the little single-track roads, but we'll see. In my experience, vibes are very, very subjective...

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You better post about the experience here dude..
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Old 04-04-2014, 10:54 AM   #514
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You better post about the experience here dude..
Planning on it...

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Old 04-07-2014, 01:22 PM   #515
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Quote:
Originally Posted by Twincrank View Post
The engine vibrations are highly unit dependent. Some of the K7x engines are smooth as silk. Others can make your feet go numb in ten minutes on the highway, much less your hands. I've ridden every new model F twin model as they came out, working at dealerships since prior to their intro, and they were a big deal to us! I distinctly remember a BMW dealer-only bulletin using the phrase "...the engine that will set the world on fire..." Yeah that didn't really pan out. Doesn't seem to matter what year/model some of these motors aren't smooth at all. Others are buttery. Must be tolerance stacking, as the majority fall somewhere in the middle: buzzes, but not bad vibes.
Twincrank

This is some great perspective on the BMW F series "vibration issue" - thanks Twincrank. While I know that sensitivity to a particular bike's vibration varies by individual, I have been wondering about the variability of vibrations from bike to bike within the various F model lines. Also good advise on test riding the particular bike you are planning to buy. While some bikes may vibrate due to tuning issues like TB sync / valve clearances, which can be easily remedied, some "vibrators" may have an issue with imbalances in the engine's rotating assembly, which would be very difficult to correct. I also believe that the rigid mounting of the engine in the frame as a stressed member and, also, the relatively low mass of the engine / frame assembly conspire to transmit (undesirable) vibrations to the rider.
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Old 04-12-2014, 06:20 AM   #516
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Two random thoughts on F800 "vibration". with NO quantitative proof to validate either....perfect stuff for a blog!!

1 The steel tubular frame of the GS models have natural frequencies (i.e. stiffness or lack there of) that tune our or mitigate the engine natural resonance frequency (4500 -5000 rpm). Where the allegedly stiffer aluminum box frame passes these vibrations on and, possibly, amplifies them with a sympathetic natural frequency. (i.e. a poor BMW frame design).

2 On some engine the CAM chain tensioner works improperly, vibrate or bunches the cam chain, which cause small shifts in cam timing contributing to engine roughness. PS I experience something like this a couple of years ago on my f650GS. It start well but the engine/bike vibrated very noticeably , far beyond normal. I ran a bout 5 miles puzzled by this. Good power, but more than normal mechanical internal noise. Enough so I stopped...check the oil...but was generally baffled. I start the bike up again, everything back to normal...very smooth, normal mechanical noise. Has not happened since.

ooops the 3rd thought

Some riders are just bothered by vibration...a ailment that can be fixed by two years on a Harley.
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Old 04-12-2014, 02:17 PM   #517
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Quote:
Originally Posted by vtbob View Post
[snippage]
ooops the 3rd thought

Some riders are just bothered by vibration...a ailment that can be fixed by two years on a Harley.
or 500 miles, whichever comes first.
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Old 04-12-2014, 02:35 PM   #518
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Quote:
Originally Posted by vtbob View Post
.......ooops the 3rd thought

Some riders are just bothered by vibration...a ailment that can be fixed by two years on a Harley.
Or eliminated by riding any Triumph triple!
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Old 04-13-2014, 04:36 AM   #519
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Or eliminated by riding any Triumph triple!
Or any Japanese 4 cylinder....the Honda V4 is evan smoother.
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Old 04-13-2014, 06:13 AM   #520
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Or any Japanese 4 cylinder....the Honda V4 is evan smoother.
No argument there... F800R -> Crosstourer

Is it running?

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Old 04-23-2014, 08:07 PM   #521
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Took my test ride today. It's a white, 2013, ESA..., 2400 mi, bags and it is parked in my garage. I guess I'll stop perv-ing over Triumph Tigers, for now.

I took a 10 or 15 mi test ride. The dealer wanted to lead me on a designated loop. We saw some twisty and a little freeway. All seemed fine. On my ride home It felt "busy". I saw 75 to 80 on the speedo, keeping up with the flow of traffic. I don't know how accurate the speedo is. I'll have to work out the GPS mounting.

Yes there are some vibes. It doesn't seem like a big issue. I think the "busy" feeling comes from the sound of the intake honk. I plan to line the inside of the fairing with sound deadening material, like Dyna-Mat. It's used to quiet car interiors for stereo buffs, and folks that like quiet riding cars. I think if I can quiet the honk the perception of vibration will lessen or disappear.

Sold my NC700X yesterday. The GT is a power house, comparitivly speaking. The NC felt lighter, torquer, all around easier to ride. If the NC had 20 more HP, I would have sold my FJR and been plenty happy. The GT has a better clutch and gear box than the NC.

I'm keeping the FJR for now. If I really gel with the GT I'll feel OK letting the FJR go. Now I need to put some miles on the GT. If this works out I could have more space in the garage.
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Old 04-24-2014, 10:16 AM   #522
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I just went on a 5 mile loop around the block. I left my ear plugs at home. I couldn't hear squat about intake honk. I liked it even better than yesterday.
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Old 04-24-2014, 10:18 AM   #523
Cortez
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90% of riders would spend money to INCREASE the intake noise.
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Old 04-24-2014, 11:39 AM   #524
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Quote:
Originally Posted by Cortez View Post
90% of riders would spend money to INCREASE the intake noise.
Indeed - I thought the intake noise on the f800 engines was one of their better qualities.
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Old 04-25-2014, 02:36 AM   #525
Cortez
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Indeed - I thought the intake noise on the f800 engines was one of their better qualities.
Yeah, the fake boxer sound seems cool to me, but many
don't like it (wet fart).
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