Rear lifting up (ZX250R)

[blue eyed savage]

yea my bad

[Robert Taylor]

when u get to hard on the stopps my mates bike ( zx250r c 1999) the rear wheel lifts of the ground, how can i fix this.

The damper rod forks in that bike are too soft in terms of low speed compression damping and also the spring rate is too soft. 70% of the problem is attributed to very weak hydraulic control and 30% or so to weak springing.
As the front end is blowing through its stroke with very little control that means oversudden weight transfer which unloads the rear. At racetracks we spend a lot of time dealing with braking pitch control, this issue is just as relevant with road going bikes as so many have abysmal control, especially with bikes such as that ZXR etc. Moreover how many people have fallen off such bikes over the years because of the limitations of the front ends?
As someone else said braking more smoothly will minimise the issue, but just imagine being able to brake with less need for such finesse and appreciably later simply because the front end is sorted out.....
In the end event its a choice between sorting it out properly or rather less than successfully fudging it with a cheap but rather less effective bodge.

[piston broke]

r taylor,
nice answer,
you are a bit far away from me,is there anyone in auck - whangarei,that u would recomend? that could sort out the duc suspension for me

[Robert Taylor]

r taylor,
nice answer,
you are a bit far away from me,is there anyone in auck - whangarei,that u would recomend? that could sort out the duc suspension for me

We get suspension units couriered to us frequently. PM me and I will elaborate. We have worked on that model / type of Ducati forks a number of times.

[Katman]

http://nz.youtube.com/watch?v=lFyn6488CUQ

What a fuckwit.

[blue eyed savage]

yes i know but i gess you just have to say it one more time dont u, i mean ur riding is perfect all the time.

[racefactory]

hey blue eyes savage,

interesting question... some stupid responses about braking less hard etc but we got there in the end.

Interesting to see the final answer and that the front is compressing too hard and quickly from low spring rate.

You going to sort it out? I guess you could brake a lot harder with some traction in the back wheel! Not to mention safer as you could emergency stop so much harder without losing the front as you'd be distributing the grip to the rear!

[blue eyed savage]

yes i think this is worth looking into more now. just looking on the net about it and i road it in the wet once and its a real handfull so my mate does need to get it sorted

[blue eyed savage]

im thinking new springs and oil? sound about right

[Robert Taylor]

yes i think this is worth looking into more now. just looking on the net about it and i road it in the wet once and its a real handfull so my mate does need to get it sorted

Be careful what you read on the net as so many ''put in their two cents worth'' and actually offer nothing useful. How many answers on this thread have ( aside from generally good natured fun ) actually given you a plausible answer?
My answer costs money to enact but ( in fear of being maligned as arrogant ) is actually the correct answer.

[Robert Taylor]

im thinking new springs and oil? sound about right

Like I said 70% hydraulics. Just fitting springs alone only sorts out 30 to 40% of the problem. PM me for a full answer or as you are in Taranaki come and see us so I can show you the full solution first hand.

[blue eyed savage]

are u open on saturday?

[Robert Taylor]

are u open on saturday?

Thankfully no, see too little of family as it is and in any event at Manfield on Saturday. 8.30 to 630 and often beyond, weekdays.

[Katman]

yes i know but i gess you just have to say it one more time dont u, i mean ur riding is perfect all the time.

You want me to "be nice" - ok.

Change your riding habits or you'll end up being a corpse long before you ever get the handling sorted on that bike.

[sinfull]

temp NZer ! Oh wait thats someone elses line !

What a fuckwit.

Hehehe Hi was wondering when you'd see that !

im thinking new springs and oil? sound about right

Like I said 70% hydraulics. Just fitting springs alone only sorts out 30 to 40% of the problem. PM me for a full answer or as you are in Taranaki come and see us so I can show you the full solution first hand.

Yeah don't rush in thinking its just a heavier oil and springs ya need ! The bikes prolly build to ride easy like, where the suspension handles it ok but like any bike (triumphs just as bad) if ya gonna ride hard ya gonna need to revaulve, respring and prolly look at the back as well !

Thankfully no, see too little of family as it is and in any event at Manfield on Saturday. 8.30 to 630 and often beyond, weekdays.

See if ya cant talk him and his mate into going to manfield for a look ! Coax them into riding on the track as apposed to that show on the vid !
I aint no saint when it comes to taking it easy (feel i need to upgrade the triples suspension also when i have the coin) but that was an apt description that Katman used with regard to that vid BES