135mph+

First of all, I don't recommend doing those speeds on public roads, the best way to see if mods have improved power is with a dyno. That said, the first things I would check is your steering head bearings, tire pressure, wear, and balance (all already mentioned).

More than likely, it is your steering head bearings that need to be tightened. If it isn't, I would look at your steering damper (depending on the year of your bike, you should have one stock) or possibly the suspension. If the bike is unloading the front too much under acceleration it can become unstable or if you have lowered the front too much it can get twitchy.

Larry

bumblebee said:

Yeah but can you feel the wind whip through your hair on the dyno???

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Only if the fans are on...Of course, if something fails, you won't feel the pavement burning away your skin at those speeds

GSXR750DJ said:

Nicely put there larryg. But even you have had to from time to time got up to this speed or close to it to feel the excitement from it.

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I'm not saying I haven't gone those speeds (and enjoyed it). My point was only that there are better ways to test changes you make to the bike. Just because 135 is your indicated max now and then several months later, after making some changes, you go an indicated 140, did you really improve the power of the bike?

Not only that, but testing a new piece of equipment at those speeds on public roads offers a potential for disaster if you have a failure. I believe the best and safest way to test a change is to dyno the bike, make a change, and dyno it again. Keeping the before/after runs as close together as possible and keeping other variables as consistant as possible will provide a more accurate evaluation of the work done. Plus you get the added benefit of testing in a controlled environement where a failure hopefully will not cause you physical damage.

Just my :2cents:

Larry