sproggy wrote:When you removed the mounting bar did you use an alternative means of support for the exhaust or just do without?
Any thoughts, anyone?
Yes. Here is a part of one of my posts a while ago
The problems with the Laser stemmed from the fact that they didn't supply a clamp between the up pipe and the cans and they made the up pipe marginally too small. So when you used the standard BMW clamp - just as it as it started to tighten, the bolt in the clamp would 'bottom' out. So everything felt nice and tight. But it wasn't. Sooner or later the joint would loosen sufficiently for the cans to slide off the back, down onto the the tyre and bounce back up to destroy part or most of the rear end - depending how fast you were going at the time.
Laser had taken the decision not to put a support bar on their Y-piece because they felt that without the weight of the cat it was not necessary. When they found out about their cans coming off they decided that perhaps they were wrong and put the support bar on. When the cans still kept coming off they then put a tie bar between the cans and the underside of the rear frame - kind of defeating the point of having the cans rubber mounted. That seemed to work (well it would - wouldn't it?) so pretty much soon after that they dropped the support bar. I would suspect that there are still some unsold ones out there with the support bar (too long and wrong shape).
They could have solved it by supplying a suitable clamp or by making the up pipe the correct outside diameter. The other method was simply to fit a shim (Coca-Cola tin) and continue to use the BMW clamp.
There is no need for the extra support provided by the support bar if the joint between the up-pipes and the silencers is secure. If in doubt use a Coca-Cola tin (or similar - I prefer Pepsi Max) shim. If that joint is secure then there is no point in the extra bracket between the silencers and the frame.
That bracket would IMHO provide some of your vibrations because it is a rigid mounting to the frame when BMW went to all the trouble of providing rubber mountings for the silencers. I think Laser were the only company to provide this bracket, but I suspect they were the only ones to experience falling silencers.
madman wrote:After a couple of years and many thousands of miles there is no problem and the exhaust is still as rigid as it was with the bar. The vibration did disappear from the footrests in Judes bike...
Exactly what I hoped to hear - thanks! Got to be worth a go. Angle grinders at dawn.....er, maybe I'll leave it until after work tomorrow to keep the neighbours happy
I'll post back once I've tried the bike without the mounting bar.
sandbar wrote:Yes. Here is a part of one of my posts a while ago
I thought I remembered reading something like that but I couldn't find it in the search I did for 'exhaust' and 'vibration'. Thanks for that.
sandbar wrote:There is no need for the extra support provided by the support bar if the joint between the up-pipes and the silencers is secure.
That's the strange thing. When I bought the bike I fitted the Remus Y-piece (which was rubbish - nothing fitted and the workmanship was horrendous) straight away. A couple of months later I fitted the Laser can and I never felt completely happy with the way it all went together - the overlaps seemed insufficient. But when I fitted the PC I had to remove the Y-piece to increase clearance for the larger lambda sensor and putting it back together that time it all seemed more secure than before. Now it's rock solid and perhaps that's why the vibration is worse than before.
I eventually found a few spare minutes yesterday evening to grind off the Y-piece support bar but as it was peeing it down with rain I didn't fancy getting kitted up just to go out and test it.
Instead I decided to take the bike to work today (I usually take the Transalp) and once it was warmed up I gingerly approached 5000rpm in 6th.......and nothing happened! No change to the 'normal' vibration. Try 6000rpm....nothing changed. Got up to 6500rpm.......and all of a sudden.........got a dig in the ribs from the Mrs on the back who wasn't too impressed to be doing that speed! My excuse was that I was watching the rev counter, not the speedo
So, bike fixed. I can now fully enjoy the effect of a properly set up PC without suffering above 5000rpm. Result.
Exactly what I hoped to hear - thanks! Got to be worth a go. Angle grinders at dawn.....er, maybe I'll leave it until after work tomorrow to keep the neighbours happy 
