i have a 1991 xt600 3tb.

I have never ridden any other bike (since learning many years ago) and therefore i have nothing to compare with.

When i drive my bike in corners and around in speeds under 70-80 kmh its stable and predictable.

when I'm driving on the highway in 80-90 kmh it doesn't feel that stable. its okay when i do slow movements, cornering etc. but if i do small and hard movements on the handlebars (like movements so hard that i wouldn't normally do them )the bike feels unstable. the bike doesn't go into a wobble, (whitch i have never experienced ) but i think this could be a pre stage to one? the bike shakes between my legs. Im afraid that the bike would be unstable on me if i needed to do a quick turn at high speeds due to deers, cats etc.

i the tire pressure is ok

i have a big box on the back, its has only 3-5 kg of luggage,(oil, chain lock etc)

i changed fork oil last fall.


new front and rear wheel bearings last year.

for all i know this is how these bikes handle?

any pointers? is this how these bikes drive? or should i check something?

My TTR600RE is terrible on motorways it wanders about and have to hold on for my life and thats below 70mph and lower if windy.

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Yamaha TT600RE 2004
Yamaha YZ250 2 stroke 99

I agree, my XT600's all were terrible on the motorway.
They are not a motorway bike really...

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Tom
I'm a country member...

Agree with above posts - The Yamaha XT600 series of bikes (all models) are not designed for riding at those quoted speeds.

My bikes cruise happily all day at 60 mph max. Higher than 60 mph they feel unsteady. Although it's possible to touch the ton just... (flat on the tank with assistance of the wind on a long straight), it's not to be recommended for longer than a few moments!

Ride your bike within it's designed safety margins (max 60mph) and all will be well. Tank it over this speed and be prepared for a spill or worse!

The XT6 is an awesome economy RTW bike nothing out there will beat it. It's reliablity and simplicity record is legendary.

Where these bikes do excel is in town on B roads (relaxed countryside riding) and on light trails. Take them onto the motorway and they are less capable. A single cylinder bike without wind protection is never going to perform well above 60mph. I ride my bikes in the countryside (summer only) at speeds averaging between 40 - 50 mph and they take some beating. I like the high riding position because it allows you to see over hedges etc... I also enjoy the "grunty" low down torque the single cylinder XT engine produces...

Lastly if you ride at those speeds, your bike (and you) probably won't last very long. If you are a speed demon then get something that will put up with that punishment and give better wind protection. Sounds like you need to get yourself a twin cylinder (or more) trail bike instead...

Some modern bikes (sports/tourers) are very capable at speed but you must ride well within your riding capability in order to stay in one piece. Never forget the country road killer - their might be a slow tractor or broken down car around the blind bend....

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Triumph Bonneville 800 (2004), Yamaha XT600E (1999), Honda XBR500 (1986).

thanks for your responses. i need to point that my speed was referred to in kilometers an hour, not miles. in miles the speeds I'm talking about is round 50 milesph.

i have owned the bike for 16 monts and this is almost the first time i have driven it on the freeway, the first time i noticed that it was so shaky.

It sounds like you have looked after the easy stuff like tire pressure, fork oil, wheel bearings.

It's time to look into the other common culprits.

My first thought would be worn swingarm bearings that allow the rear wheel to wag back and forth slightly going straight but track straight when leaned over in a curve and forced to the side. On a twenty year old bike I imagine it is a combination of things, steering head bearings worn or slightly loose, possibly loose motor mounts, worn rear shock, rear wheel slightly off square to the frame.

Add to that a top box on the back catching air at speed exacerbating things and the old bike starts riding like she's been drinking again.

People in third world countries who are too poor to fix these things slow down or else learn to dance with drunk bikes. You are hopefully able to tighten things up and get a more stable ride.

Best luck.

Kindest regards,
John Downs

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South America and back on a 250 Super Sherpa Minimalist Adventure http://advrider.com/forums/showthread.php?t=831076