Triumphrat

itcha · 01-02-2008

Now that I have been doing more highway riding I have noticed that once I get up around and above 100km I feel quite a bit of vibration in the handlebars and can see it in the mirrors also. I have aftermarket handlebars (Tomaselli clip ons) and recently upgraded to Hagon springs. I'm just concerned that it may be due to the spring upgrade. Should I be checking anything or is this normal on Bonnies.

itcha · 01-02-2008

Also my tyres are running the correct PSI and they aren't showing signs of being worn or uneven. It just seems like a bit too much vibration for a new bike. Can spoke tension cause vibration issues. I do tension the spokes every so often but not sure if they are all the exact same tension.

Tabletop · 01-02-2008

I don't think it's the suspension improvements that are causing the vibration. High frequency "buzzing" in the handlebars is normal on all bikes, they all have it at a certain speed.

The stock Thrux clip-ons are solid aluminum. I switched to LSL clip-ons, which are hollow, and even though they are thick walled, I noticed a slight increase in vibration.

I don't know if the Tomaselli's are hollow (I'd suspect they are) but a set of bar end weights may do the trick for you.

dazco · 01-02-2008

This will sound crazy, i know. But i swear it's true. When i got aftermarket mirrors they were more blurry than my stock ones were. So much that i could see a car in them but could barely tell the color let alone the type of vehicle. Not long after that i tried side gapping my plugs (google it if you don't know what that is) in hopes of better performance. Long story short, that smoothed the bike out so much i could now see clearly in the mirrors ! I was amazed when i got on the freeway and felt so little vibration in the bars, then quickly realized the benefit to the mirrors. They did other things too, (they DID increase performance some and also made it idle more consistently) but the smoothness was the biggest surprise because it was not a subtle difference. The mirrors are still a bit blurry, but the difference is nite and day. you might wanna try it since plugs are only about $4 a set and you can side gap your old ones and if for some reason you want to go back (tho few do) you can for four bucks.

sweatmachine · 01-02-2008

sync the carbs

amanger · 01-03-2008

Fill the bars with river sand (or fishing weights),fit bar end weights and balance the carbs.

RonD · 01-03-2008

Just wondering my bonneville has no vibration in the bars ,the only thing thats been added is a nice set of gran tourismo grips there a lot thicker in diameter than stock, and they feel a lot nicer ,its very smooth a lot smoother than what i expected it to be ,is this just a thruxton thing or am i one of the lucky few?

ohiorider · 01-03-2008

Some more voodoo. I've found when I remove the silencers to change a rear tire, that the bike will vibrate when I remount them (the silencers). Possibly because they are in a slight bind and the exhaust and engine vibes are being transferred to the frame. My solution is to slightly loosen the silencer mounts and clamps ...key word is 'slightly', rev the engine several times, perhaps run the bike up and down the block in first and second at fairly high revs.

Nutty as this sounds, it seems to allow the mufflers and exhausts to take their 'natural' set, I then torque them back, and usually there's less vibes than before.

First experienced this with my Kaw W650.

Bob