Noddy thru a wobbly - Triumph Forum: Triumph Rat Motorcycle Forums
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post #1 of 7 (permalink) Old 04-03-2019, 12:43 AM Thread Starter
Grand Prix 250
Main Motorcycle: TT900
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Noddy thru a wobbly

96 900 Trophy. Loaded with gear including a large bag across the passenger part of the seat. 85 mph, got a buffeting unstable wobble. I removed the small top window and ran to 87 mph. Next suspect is the large rear top box. It tends to make the rear end move around. Will be a week or so before I can test again. Anyone else have stability problems with a Trophy?

UK
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post #2 of 7 (permalink) Old 04-03-2019, 11:08 AM
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Main Motorcycle: 1996 900 Trophy BRG
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Yes I had that problem in the past, but it consistently happened only when I got to 100 mph. It didn't matter if the top box was on or not. Same thing with the panniers, on or off it still happened. It took a while to figure out what was going on. A few futile suggestions from other sites were given to me.
The cause: I had raised the fork tubes in the triple clamps about 1/2 inch, I loved the way it handled. Crisp, clean, no longer felt like a truck.
The fix: I raised the fork tubes back to the stock settings. If your forks tubes are at the correct level, maybe the fork springs have gotten weak. Check for the amount of sag when you sit on the bike.
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post #3 of 7 (permalink) Old 04-03-2019, 12:33 PM Thread Starter
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Thank you Greg. I had raised the forks 5/16 of an inch, and softened the preload on the rear shock. These changes should not affect the handling, but I will return them to normal for testing. I had also wondered about the two air scoops low down on the fairing. They seem designed to provide cold air to my feet. I put tape over them. The cooling fan was running after some slow speed riding in town. I removed the tape.
I hope other Trophy riders will respond. Might be some good info for both of us.

UK
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post #4 of 7 (permalink) Old 04-04-2019, 03:09 PM
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Small changes in fork height can have noticeable effects on the handling of the bike. That was one of the things we would fiddle with on our desert racing bikes. Some other things I would check are tire air pressure and make sure the rear wheel is aligned (chain adjusters). Also, make sure the front and rear suspension settings (whatever adjustments the Trophy has) are balanced. Unbalanced suspension settings front to rear can make high speed handling really dangerous.

Dave
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post #5 of 7 (permalink) Old 04-04-2019, 03:15 PM
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I meant to add, I may or may not have had my '98 Sprint Sport up to an indicated 135 mph, and have never experienced any instability, so I don't think your issue is anything inherent in the design of the bike. This was both with and without the fairing. Only issue I may or may not have had was the mirrors folding back at a certain speed. So your issue is surely something i think you can fix.
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post #6 of 7 (permalink) Old 04-05-2019, 09:21 PM
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I may or may not have had the mirror folding back issue too LOL
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post #7 of 7 (permalink) Old 04-10-2019, 12:18 AM Thread Starter
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Quote:
Originally Posted by dzrtr8r View Post
I meant to add, I may or may not have had my '98 Sprint Sport up to an indicated 135 mph, and have never experienced any instability, so I don't think your issue is anything inherent in the design of the bike. This was both with and without the fairing. Only issue I may or may not have had was the mirrors folding back at a certain speed. So your issue is surely something i think you can fix.
How much gear do you have on the Sprint Sport when you did not hit warp speed? The pics show several different fairing modes. None show any saddle bags. My Trophy has the rear bags which show in all the pics. The large top box must have been an option. It has the same construction as the bags. Today I rode without the top box, and it is a different handling bike. I used a small square top bag of another bike. Next ride will be without any top box gear.
Max speed on the big island is 90 K. We can get in serious trouble exceeding 130. I need to do over 190 to check for any wind wobble. It may have to wait until I get over to the mainland again. Often some of the faster cages are doing 140 plus. I would blend in.

To save starting another thread:
My fan runs after I shut off, and after some very slow riding, like in a line up for the ferry. But it was only 10 C. Maybe the full fairing keeps things warm in there. On the fairing, there is a hole low down on each side. Only purpose seems to be, to keep my feet and lower legs cold.

UK
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