Landracing Forum
Bonneville Motorcycle Speed Trials => Bville Motorcycle Speed Trials General Chat => Topic started by: jdilly on March 03, 2012, 07:04:29 AM
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anybody have any tips on chassis setup?
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How about a little more information? Building from scratch.... using a 50s Harley.. or a new BMW...
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I have a 2000 se road glide with a turbo.It has about 180 hp.I went to limestone last year and had a bad wobble,and i have heard a hundred different sugestions from street guys but not from land speed guys any thoughts would be great.
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Bad wobble at what speed? How "stock" is the suspension/suspension settings? How much weight in/on the bike? What tires? We'll try to get there yet. :?
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Jdilly, details, details - need more/all info. or the rplies will be like "did you tighten all the nuts?"
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Jdilly, details, details - need more/all info. or the rplies will be like "did you tighten all the nuts?"
I'll bet a good wobble tightened at least a couple of them... :roll:
sorry I was not specific enough to say give us more details about your bike and problem. Speed wobble can be caused by loose bearings in the neck or swingarm... flex in the frame... wheel alignment
tell us what specifically happened and what you have done.
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my bike was basicly stock,i lowered the frount forks,installed a steering damper. shorter fox shocks on the back.avon tires130 /16 frount,160/16 rear. stock motor mounts. i have reserched a lot over the winter.i have bought tri-glide tripple trees that kick the forks out a few degrees.and have plans to buy glide pro motor mounts and line up the wheels.put a brace on the motor to the frame.
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Have tires and wheels dynamically balanced ... check wheel bearings ... lowering legs thru the triple trees takes out caster, might want to bring that back to stock ... there is a lot to go over especially on a stock raked bike ... Joe
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The stock front forks on a Road Glide are totally set up wrong for high speeds. You at a minimum need to install a Progressive monotube fork cartridge kits.
If you do not know what that is call me at 303-702-1600 and I can get you a set for $340.
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Dilly, is your wobble under power or on shut down? Is there something that triggers it?
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under power it starts walling around 100 and doesnt stop till i slow way down,it feels like it is in the rear.i think that my trail is off with the tri-glide trees that i just installed.so i am going to install my stock trees that will bring my trail back to 6.5 inches, install a brace and change the motormounts, put better fork and shocks and head to the turnpike for testing!
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I would go back to stock triple trees first ... Joe
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I totally agree with Joe - get rid of the raked trees. If you need to increase the trail of the front end, rake the steering head. How much did you lower the front tubes. That was a mistake I made 3 yrs. ago - had to change my shorts twice that year. How is the attitude of the frame sitting ? Does it sit fairly level front to back ? I would think 6in trail should be good to go.
keep at it - with the help of some of the ole gray beards here, you'll get it right. They helped me plenty.
Jimbo
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Check your toe setting. A little toe-out and it will be all over the place.
Regards, Neil Tucson, AZ
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We're talking bikes here Neil. Toe ain't that critical! :evil:
Pete
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The HD baggers are notorious for shaking their head with a high speed wobble. That's why Laura Klock doesn't ride her HD bagger anymore. The problem originates in the rubber mounted swingarm/rear engine mount. The trees are a small part of the problem also. You can fix the biggest part of the problem by getting the poly rear engine/swingarm bushings. The engine stabilizer that mounts under the oil pan will help some but I personally don't think it's worth the price they get for them. That's what you can do with off the shelf parts. If you want more find someone with a frame jig and a welder...
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Dilly, is your wobble under power or on shut down? Is there something that triggers it?
In my experience, the answer to all your questions is yes...
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Who's got the photo of the bagger with the pinwheel guy at El Mirage a couple of years ago. I can't find it.
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That thing looked scary sitting still. They had made numerous frame modifications to it. I don't remember the particulars though.
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We're talking bikes here Neil. Toe ain't that critical! :evil:
Pete
That'll teach me to read further in the thread! :-P
Regards, Neil Tucson, AZ
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It might be good to slow down on that thing while you are still alive.