Triumphrat

jrelloway · 07-17-2008, 02:39 AM

Well, today as I was riding down the freeway, I decided to give her some gas, got it up to 125mph and noticed an increasing vibration or a shudder from left to right in the handle bars starting at 90mph and getting worse as I got faster. Didn't notice this a week ago when I was at 154...(don't try this at home kids)...and it's completely confusing me. I know I didn't hit any bumps out of the ordinary and everything was fine before. Could maybe my balance have gone out of wack? Pressure low (I'll check tonight but don't think it is)? Never had this problem before...

Fellow 675'er

jrelloway · 07-17-2008, 02:41 AM

Wanted to get it also measured for balance and was wondering how fast they get the tire up to when testing. Since it only happens after 90mph, would they beable to detect it. There isn't any apparent shuddering around town and at 75-85mph on freeway. No noise coming from anywhere either. it's gotta be the tire or wheel balance.

TripleThreat · 07-17-2008, 10:55 AM

Most shops use a static balancing technique that doesn't involve spinning the wheel like a car balancer.

Couple of things to check, If you have the stock steering damper installed, my service tech has indicated that there have been a few bikes with issues on the stock damper. Check to see if it is providing any resistance when moving the bars back and forth quickly.

As you mentioned, you should also look to see if your wheel weights have fallen off your front wheel. If you find the weights are in place, then it is most likely something wrong with the wheel or tire.

Definitely keep the speeds down and get it checked asap.

TripleThreat

jrelloway · 07-17-2008, 03:03 PM

Quote:

Originally Posted by TripleThreat

Couple of things to check, If you have the stock steering damper installed, my service tech has indicated that there have been a few bikes with issues on the stock damper. Check to see if it is providing any resistance when moving the bars back and forth quickly.
As you mentioned, you should also look to see if your wheel weights have fallen off your front wheel.TripleThreat

I've located the damper and turned the steering back and forth quickly, how else would I check if it's dampening or not? This is the first time I've had a bike with one on so sorry if this is a stupid question...

I've also checked to see if any weights have fallen off and they havent. Besides checking the damper, I'll go take it in if I can't figure out what else it could be. If it is the damper, I have atleast a year left on warranty, would this be covered as I just bought the bike from a dealership, used, only a month ago.

Also, do aftermarket steering dampers add any performance gain if I have to replace it and the stock isn't covered. If they do add a performance gain, is it only if your going to the track? because I don't ride track, and spending extra money for higher performance where Im not going to use it, isn't worth it. Would love to do track days, but with school and a job, it doesn't leave much time for track days.

Thanks again for the help!

TripleThreat · 07-17-2008, 04:59 PM

First, The damper and every other part would be covered under warranty for two years from the date of the bike being registered with Triumph as being sold to the first owner, so you should be good there.

The stock damper is more than adequate for street riding and if you're not taking it to the race track, then I wouldn't worry about replacing it.

The damper should make a swishing noise as you move the bars back and forth quickly and with a lot of force. This noise is the fluid in the damper passing through the internal passages and creating resistance.

The best recommendation I could give you is to take it in and have it looked at.

I just discovered a failing front wheel bearing on my '06 Daytona Street Bike and it has less than 10,000 miles on it. I am replacing the bearings, seals, spacers, etc. as I'm not sure what caused the problem.

If you happen to have a wheel bearing going bad, a catastrophic failure at speed could be really hazardous to your health...

TripleThreat

jrelloway · 07-18-2008, 03:16 AM

I have noticed a small squishing sound, not a big or even moderate squishing sound like I would from a hydarulic. I don't hear a single sound from the bars moving back and forth so I should think it is the damper. Well, I'll checket it out. Thanks for the advice! I'll tell you what happens!

jrelloway · 08-04-2008, 04:46 AM

Turns out it's these crappy darn OEM Pirelli tires. Gotta get some different ones. The dealer says that after a few heat cycles, these Pirelli's get hard and have a tendency to somewhat distort and not stick like they should. I don't know how this could be possible but a new set of tires sure gives me a woodie! Especially something good!

TripleThreat · 08-04-2008, 09:58 AM

I would find it hard to believe that it is the tires unless you can see excessive cupping in the tread from under-inflation and the effects of the crown in the road.

I ran the OEM Pirelli's on the track and street serving dual purpose and never had a single heat cycle related problem that resulted in a vibration, even at 160 mph (on the track).

It sounds to me like an excessive wear issue or a balance issue.

I think your dealer is full of BS on the heat cycle comment...

TripleThreat

Budo · 08-04-2008, 03:35 PM

Quote:

Originally Posted by TripleThreat

I would find it hard to believe that it is the tires unless you can see excessive cupping in the tread from under-inflation and the effects of the crown in the road.

I ran the OEM Pirelli's on the track and street serving dual purpose and never had a single heat cycle related problem that resulted in a vibration, even at 160 mph (on the track).

It sounds to me like an excessive wear issue or a balance issue.

I think your dealer is full of BS on the heat cycle comment...

TripleThreat

+1 on the dealer BS...

There is no possible way that the tire cupped so badly within a week and induced that high speed vibration you mentioned. Unless you went touring on the stock pirelli's, then it's possible :P

Daknbleka · 08-05-2008, 12:45 PM

You had possibly lost a balance weight from your front wheel on your previous ride.
I had to get mine rebalanced on my new Daytona (1100miles) as it was doing the same thing (found out once I had ran it in and was getting used to warp speed

). from 90/100 on up the faster I went the worse it got.
Brand new Pirelli's. So shouldn’t have been a problem.
Back to the shop a fresh balance and new weights and it now runs as smoothhh as something.... very fast and very smoothhh