STRONG VIBRATIONS

[Tonythetiger]

Evening chaps, I've finally been out on my bike for an hour and have noticed that she has a strong vibration around the 4.5k area and has a bit of a weavey wobble that feels very strange and un-nerving at about 80ish, does anyone have any idea's on this. I've checked the chain and it's adjusted correctly, tyre pressures are good
and the tyres are new so not got any flatspot's. All sugestions welcome.
                                Tony.

[seth]

Head bearings ?
Swingarm bearings ?
Wheel bearings (front and back) ?
Check the subframe as mine cracked ?
Front removable frame rail lose or corroded ?
Front sprocket lose ?

[KiwiCol]

Tony, just an odd one to add, you say the tires are new & correct pressure, did the bike do this before the new tires were fitted? if no, then I'd be looking into the tire side of things.
Possibly (not really likely, but can happen) the new tire has a defect & is delaminating at speed.
Wheel nut not done up properly
Wheels badly out of balance

Tell us a bit more about the vibration, is it synchronous with the engine revs or bike speed ie wheel speed?

[Tonythetiger]

I will need to take her out again later this week as I'm busy tomorrow all day (Birthday drinks) but I'll try and gat more info asap.

[DTTW]

Mate had new PR4 fitted back last week to his 14, been complaining since about vibration at around 120kmh, not far from 80mph. Seems that the tyre is faulty. It has some deformation in it, just not symmetrical. Was refitted and balanced, didn't help. Take a look at your's, might be a bad tyre.

[Hooli]

Last time I had a PR4, it was a PR4 Gt & delaminated & fell apart 1,200 miles down the road. Nice to know they've not changed the quality.

[Dwain Dibley]

Last time I had a PR4, it was a PR4 Gt & delaminated & fell apart 1,200 miles down the road. Nice to know they've not changed the quality.

LOL

D.D.

[black14]

I've run the Michelin PR (now Road) series on the 1400 from after the original tyres to now without a problem. That's quite a few sets... I do recall not liking the PR3s and PR4s as much as the other variants, but mainly due to front tyre wear.
Just how old was the PR4 your mate fitted DD? I haven't seen them for a while - the Road 5 has been out since 2018 so maybe an old tyre?

[Dwain Dibley]

Not me, I use Pirelli angel st's, it was DTTW.

D.D.

[grog]

Slightly off subject,which tyre do you wear out first? Always front by a fair bit from me.

[Dwain Dibley]

Back in the day it was two rears to one front(hard acceleration,burn outs etc) but now I reckon, not doing the mileage, it will be about even, and I'll change them in pairs.

D.D.

[Mick_J]

Depends on the bike but I usually get 2 rears to one front.

[KiwiCol]

My front is usually the one to go first, replace as a set.

[Hooli]

1 1/2 rears to a front for me, seemingly on every bike. I change them in pairs now days as the bike rides better that way.

[Dwain Dibley]

Better deals for pairs as well 

D.D.