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Tank slapping while cornering

Old 05-10-2010, 02:28 PM
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Join Date: Aug 2009
Posts: 65
Default Tank slapping while cornering

I have a tank slapping or head shaking issue while making a 90 degree turn at intersections.

Today afternoon, I was making a 90 degree right turn at an intersection. I slowed down to 20 mph and felt that I needed more angle as I approached its apex and I leaned the bike. I yanked the clip on to countersteer and at the instant the bike leaned more the clip ons jerked left and right 4 times in quick successions.

Tire pressures are within spec.

The bike is all stock. Tires need to be changed as it was on the bike for several years and has weird patterns on them although they still have good amount of meat. In my guessing, the front struts also have several years olds fluid in them. By getting new tires and changing front struts' fluid, will this phenomenon be eliminated?

1991 Honda CBR 600 F2
About 30k miles.
Resucitated last year fall from 3 years of garage keeping.
Old 05-10-2010, 04:07 PM
gotcbr's Avatar
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Join Date: Apr 2009
Posts: 6,494

Tires w/ "several years" & "weird patterns" certainly isn't helping anything. Old tires are a safety issue w/ possible dry-rot as well & should be changed b/f anymore riding is done.

Your "head shaking" could be bad steering head bearings. I recommend having this repaired asap, if this is the issue.

Your fork fluid isn't necessarily bad as long as you haven't had any leaks from bad seals. Since you didn't mention rebound, who knows?

Its hard to know exactly what you've got going on w/ everything. Perhaps taking it to the shop would be the best recommendation here. Personally, I wouldn't ride it again til there are new tires & the head-shake issue fixed.

Good luck.
Old 05-10-2010, 04:28 PM
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Join Date: Nov 2008
Posts: 524

get some tires on there
Old 05-10-2010, 05:32 PM
Kuroshio's Avatar
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Join Date: Jul 2009
Location: West Philly, PA!
Posts: 4,476

True dat. You got too many eggs in the basket to figure out which one is the rotten one.

Simplify the problem by eliminating variables and maybe it'll solve itself. Start with the tires.
Old 05-10-2010, 09:08 PM
fubbzie's Avatar
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Location: York, Maine
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Like most said a good set of new rubber would hurt anything but your wallet.
Old 07-01-2010, 04:33 PM
land_warrior.rus's Avatar
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Join Date: Mar 2007
Posts: 323

During one race i had a tire that was deflating as i raced (dumb tire fitter damaged it and neglected to tell me - bastard).
Here is the video - just remember, that fast corner was 6th gear flat out :-)
Old 07-01-2010, 07:34 PM
Thread Starter
Join Date: Aug 2009
Posts: 65

Thanks a lot. I'm gonna get new tire and change fork fluid see how it will help.
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