New Engine Vibrations -- Help Me Track It Down?

Hey all,

Thought I'd come out of lurking status to ask a question. My bike has recently begun producing engine vibrations and it's worrying me. I would say it's been building up over the last 500 miles or so. I'd really like to track it down.

Here are some details:

1995 VFR 750F
26700 miles
At 17000 mile mark it got: new plugs, new coolant, new oil, new brake fluid, new K&N filter
Just changed the oil yesterday
Valves have never been checked that I know of. Bike had 16500 miles on it last May when I bought it, now it has 26700.

Happens over the whole rpm range
Happens while stopped and while moving
Bike isn't super smooth while idling, but it doesn't seem too rough. There is vibration, however. What I mean is that is seems the be running without stumbling, but there is vibration.

Basically, I can sit there while stopped and rev the engine, and feel it vibrating. There is no obvious noise other than the engine revving.

I had to ride it on a 90 mile round trip last night and I was really stressing out. It just doesn't feel right.

It can't be drivetrain if it does it sitting still.

So... Would out-of-spec valves cause vibration? Starter valves? Engine mount? Anything else???

 

First order of business, check any and all engine mounts, and since you said it happens when you are at a dead stop we can rule out the chain. If I were you, a carb synch would be in order. Starter valves are on FI, not carbed bikes. I don't think that valves would/could go such drastically out of adjustment that you would notice this immediately though. However, a valve adjustment is never a bad idea if it is overdue.

 

Based on my recent experience, I also vote for a carb sync.

Cheers!

Craig :smile:

 

+1 on carb sync someone just posted they did carb sync and vibration issue they had went away.

 

you should have posted link to your findings for him
link below

http://vfrworld.com/forums/general-vfr-discussions/25614-carb-sync-results.html

 

I would have posted a link, but I'm just lucky to be able to log on!
Thanks for posting it.
On a side note, I finally got 100 posts today! Time for a Guinness!

Cheers!

Craig :smile: