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Buell Forum » 1125R Superbike Board » Archive through August 08, 2011 » Tire issue, now I have head shake! « Previous Next »

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Dktechguy112
Posted on Tuesday, August 02, 2011 - 01:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have had a oem pirelli matched with a Pilot road 2 on the back for a while, I just got a Pilot road 2 on the front, and now I get bad head shake above 90 mph, especially under hard acceleration. It wasn't to bad until the other day I got a tank slapper going over 100 mph. Something is not right, it doesn't make sense that I have problems now that my tires are matched. pressures are 38 F 42 R.
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Mountainstorm
Posted on Tuesday, August 02, 2011 - 01:19 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I was not fond of the Road 2 up front. Worked okay in the back. A 2 CT up front and Road 2 in the back worked well. Try 36 pounds up front and 38 in the rear and see what that does.
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D_adams
Posted on Tuesday, August 02, 2011 - 06:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Matched tires mounted at the same time is ideal, front tire balancing is probably the more critical part, although I try to get both of mine within 1/8th of an ounce. Its not hard to do, even manually. It just takes a little bit of time.
One thing I don't do is mix/match tires between manufacturers.
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Fast1075
Posted on Tuesday, August 02, 2011 - 07:16 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

There was a thread a while back where several guys in the U.K. were having problems along those lines with PR2's.
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Two_seasons
Posted on Tuesday, August 02, 2011 - 07:52 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Too much air for the speed AND the heat.
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Jdugger
Posted on Tuesday, August 02, 2011 - 08:05 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Headshake under hard acceleration is probably from incorrect input to the bars.

It's relatively normal.
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Chessm
Posted on Tuesday, August 02, 2011 - 12:34 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

i have PR2s and ive had my bike at 100+mph speeds (just did it again yesterday) with no issues with stability whatsoever. i dont have a steering damper either.

im guessing you didnt have this issue before the tire change? if so, id take a look at the balancing, also check that that the axles were properly reinstalled.
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Dktechguy112
Posted on Tuesday, August 02, 2011 - 10:06 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Its not an input issue at the bars, I grabbed the frame with my legs and barely touched the bars and it still happened.

The issue began when the I put on the FRONT PR2, I had the back PR2 on for 3k miles with an oem front with no issues.

I think I'm going back to the oem's, I have an extra set, and its not worth the safety issues to save a few bucks on the PR2's.
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