[mitchman]

I own 250R since 2008. For the last two years I am taking it to the track. Based on this forum I also made a few basic modifications which dramatically improved track time/fun. So big thanks to the ninjette.org for the available knowledge.

But now I have a question that I cannot find in any of the forum posts here.

The thing is that when I ride quite hard on the small tracks, it happens that I lose the front grip. Front of the bike is shaking quite intense, its even hard to save the bike. Was not sure if the front end is overloaded or unloaded (body position), but from the tyre wear it looks like I reached maximum lean angle on the front tire and am not event close to the max lean angle on the rear tire. Check the photo of both tires in the attachment. Click it and zoom it. My opinion is that the bike can handle more, but something is wrong with a setup or body position.

I am running original dimension on front(110) and a bit bigger on the rear(140). I picked this dimension because I read that a lot of people racing the 250R use this dimension. And a word about the body position: this happens when I am not sitting, so its a knee down situation, body is aligned a bit to the front. Like you would like to put an elbow down, but without putting it down actually. Yeah, description is funny, hope you get it.

So the question is if you guys racing this machine had similar issues with an unused rear tire? Is it normal behaviour for this tire combo (110 front and 140 rear)? If not, do you think that the problem is body position or bad setup? How to get more from the bike?

Bike has a bit shorter wheelbase than standard (jack-up kit: 30mm = 1.2 inches). I also use lower woodcraft clip-ons, higher rear sets and stiffer fork springs.