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skyhighdaz

650r steering wobble

10 posts in this topic

OK, in SM trim and at med to high speeds, I get a little instability issue with the BRP. I know, I know, this ain't a sport bike. But the 15ish miles of straight and level roads to get to the good stuff needs to be a little more palitable. Just a little touch either way at speed tries to send this thing off in the briar patch.

Would a fork brace fix it ($80) or do I (non race guy) need a stabilizer ($300+)

Thanks experts!

Mark

Central CA

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The stabilizer would help for sure, but before dropping that much coin I'd make sure that a) the sag was set correctly for my weight and then B) experiment with the height of the forks in the triple clamps. More fork above the top clamp quickens the geometry and makes the bike twitchier; less above does the opposite. I'm currently at 10mm (just under a half-inch) of exposed fork tube above the top clamp and thinking of going to 20.

Also, on my XR4 I find that while the geometry is good at lower speeds (30-50) it'll get a little wobbly going faster. Shifting my butt back on the seat has the same affect lowering the forks in the clamp and settles it down a bit.

hth,

Robert

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what size tires do you have?

X2 about droping the forks in the clamps.

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SRC Fork brace, or similar, Scotts stabilizer....... and tire pressure, will be a factor as well............The stabilizer is pricy but worth every penny..................

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Have you checked the triple tree bearings? They may need to be greased or replaced.

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If you are running the stock forks (and I assume you are), you most definitely need a fork brace. With the wider front tire and the absolute traction of asphalt, you are putting enough of a load on the forks that the flex is causing the wobble.

I don't supermoto mine, but I race it pretty hard. It was a huge improvement when I put a SRC brace on my 650R. If I were you I would get the SuperBrace. Just because I think it has a better "look" for a Supermoto IMO. In the end, I have gone with inverted forks because even with the brace, I was leaving black marks on my headpipe from the forks bending back and allowing the tire to hit the pipe going through whoops and landing off of jumps.

A Scott's will solve the problem also, but it is a band aid for the real issue of fork flex in your situation.

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What tires are you running? I have noticed huge performance/stability differences between tires. Also, what is the condition of your front tire? New/used/abused/no more tread blocks/Heavily feathered tread blocks?

I've taken Dunlop D606, D952 & Michelin S-12 front tires just past 100 MPH on the street. The 606 was the best and the S-12 was the worst, but off road it was opposite.

I have found that the dirt bikes only offer a little amount of stability. You need to keep at least 1 hand on the bars over 50 or 60. From what I hear, stabilizers go the extra mile if you still don't feel like its right.

On my street bikes, they would start to wobble when the front tire was at the end of its tread life.

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