[Stevumph]

Just thought I'd run this past you,my 94 Trophy triple is fine solo ,but two up and i get heavy vibrations.
Chain tension seems fine (I suspected it might be tight) but it still vibes when we are free wheeling.
Next thought was a plug breaking down under load? Any ideas appreciated (and my pillion is only 10 stone )
Merry Christmas by the way!

 

[daveforty]

One thing I would suggest investigating is wheel bearings, I have been through two sets on both wheels of my Trident. Not too difficult to replace, cost about £6 each from a bearing supplier, but you'll need to go to the bike shop for new seals. The bearings used are standard sizes & types so you could get them anywhere, I used Revolution Bearings in Radlett, Herts.

 

[doodledog]

could still be the chain, both of you sit on the bike and get someone to check the tension, any extra weight will tighten up a tight chain even more,other thing to check could be tyre pressure, dont think it would be engine related as at 10 stone your hardly over stessing it unless you weigh 20 stone of course, suspension may be needing a stiffer position for pillion. apart from that I dont know.

 

[Stevumph]

Thanks both of you.
Dave im not thinking it might be wheelbearings because it seems to ease if I freewheel with the clutch in.
And Doodlebug ,yep I think that chain tension may be part of the problem,and the reason I posted was partly to see if anyone else had experience of this two up.
Hmmmm I guess if I dont stiffen the rear suspension ,it will put strain on the drivechain. thats pretty well what I suspected.
I need to sort it though as the tension will put strain on the bearings.

 

[panda]

On 2006-12-31 01:56, Stevumph wrote:
Thanks both of you.
Dave im not thinking it might be wheelbearings because it seems to ease if I freewheel with the clutch in.
.
I need to sort it though as the tension will put strain on the bearings.

when you powering on the chain pulls onto the wheel bearings, power off and load removed. You might be using enough power to get what performance you want and be using more power when two up, plus the chain will be tighter due tolowered suspension.
It used to be a technique with triumphs to keep power on when cornering. this enabled the chain to act like the string of abow and keep the swing arm stable to stop the bike weaving. problem was you ended up going faster and faster on long bends

 

[panda]

On 2006-12-31 01:56, Stevumph wrote:
Thanks both of you.
Dave im not thinking it might be wheelbearings because it seems to ease if I freewheel with the clutch in.
.
I need to sort it though as the tension will put strain on the bearings.

when you powering on the chain pulls onto the wheel bearings, power off and load removed. You might be using enough power to get what performance you want and be using more power when two up, plus the chain will be tighter due tolowered suspension.
It used to be a technique with triumphs to keep power on when cornering. this enabled the chain to act like the string of abow and keep the swing arm stable to stop the bike weaving. problem was you ended up going faster and faster on long bends