My bike likes to stall while doing stoppies. For the most part, I'm still learning how to do them, so I rarely get the rear up very high. This also means I am brakeing very hard. I'm thinking that its probably more the braking force then the angle. Should I wait until I can do long enough stoppies that i dont brake hard? Any Ideas?

Thanks,
Jeff

 

explain your technique a little more?

 

I'm not comfortable enough to get the bike up real high, so ususually its pretty low. And the lower it is, the harder you have to brake to keep it up. So I'm thinking maybe its the force from braking so hard.

Its a pretty old bike, so it doesnt really surprise me.

 

How fast? What gear? What's your clutch hand doing? How are you sitting?

 

some bikes have a cutoff (grounder)so if the bike was ever to laydown or what not it would kill it self. lot of racers have the problems of leaning to far into a curve and the bike turning off....just fixed one on a tl1000.....filling them with silcone works good.

 

sounds like a poss. carburation problem, sticking floats, flooding?

 

i bet gas in the airbox...bri_dte had the same problem a while ago when he was on his f4...pm him for more details


Teach

 

Down Draft Carbs. Your f#cked I bet you'll always have this problem with these carbs. What I would do is this. I would take the carbs off and raise the float level this lowers the fuel level in the carbs. I would go to FactorPro.com and go with the Float level height they suggest. You can try idleing up the bike to that might work for you.

 

is your clutch held in????? try in neutral

 

ok, i completely forgot about this post.

I always clutch when I do stoppies, habit I guess.

I dont wanna mess with too much, and Its not that big of a deal if it stalls, since i dont do them on the street. I dont know, I guess I'll worry about it in the summer.

thanks for the advice,
Jeff

 

I'm gonna give you a COMPLETELY different way to look at it, one that most people never think about...


Kickstand. The hard slamming down is possibly making your kickstand come down just enough to where it sets off your kickstand shutoff if you put the kickstand down (or have it down) while in gear. The spring would snap it back up, but it can still trigger the sensor.


Just one more reason not to do stoppies while in gear unless you want to do stuff like Perfect 10's (stoppie->wheelie). It's actually hard on your transmission. Your rear wheel (and transmission) are spinning at a higher speed that your bike is going. Once you put it down, the rear wheel has to slow down QUICK. Things are still spinning and engaged. Not good.

 

I was just gunna say what about the kickstand.

 

a way to get around the gearbox abuse while doing stoppies in gear is to slowly stop the rear tire while its in the air.....it looks cool too....

 

I would advise against stopping the rear tire for 1 reason:

balance.


80% of a bikes stability is in the gyroscopic effects of the rear wheel.

Furthermore, the rear wheel movement affects height. Imagine it like this:

If you slow the rear wheel down in a wheelie, what happens? The front end comes down. If you slow the rear wheel down in a stoppie, the front comes down.. but wait, it's already down -- the rear comes up!

Ever see MotoX when they hit a big jump and they are gassing it to control the front end height? Gas in the air = bring front end up.

 

Sounds like you're causing al the gas in the float bowls to slosh forward the jets are starving for fuel for a second. There is no sensor on an FZR that would cause it to stall during a stoppie, so you can forget that. Check all your carb vents lines. If any of them are partually blocked, the float bowls would be slow to fill up. There are plenty of people doing long stoppies on bikes with carbs, so I know it's possible. I disagree wit hthe guy who said you want less gas in the float bowls, If anything, you'd want more so that when it all sloshes forward, the jets and emulsion tube are still submerged. And, to the guy who fixed the TL, if it was stalling while turing on the track, it wasn't the tip over sensor, they can't cut out while the bike is moving. And it's a sealed unit, so you may want to have a look at what you sealed with silicone, it may not have been what you thought it was.

 

i never though about the gyro of the rear tire aspect, but thats why i said stop the rear tire slowly, cause it will raise the rear end no matter how slow you do it, but the effects will be less the slower it stops..........

 

Actually, gassing it in the air brings the rear end up. You lock the brake to drop it. You can also grab the front brake and stop the front wheel in the air to make the front drop. If you slow the rear wheel in a wheelie, the front comes down because you slowed down and reduced power. It has nothing to do with gyroscopic effect. And the part about stopping the rear wheel during a stoppie making it come up just doesn't make any sense. If anything, it would make the rear drop, not rise. The lack of rotation wouldn't counteract gravity. Besides, the gyroscopic force would only be at work if no other forces were acting on the bike, like, when you're in the air on a motocross bike. During a stoppies, you're providing input with brakes and body wieght.

 

uhm, let's give a real world example again. I will repeat myself for the sake of posterity:

If a moto-x guy gasses the bike when he's in the air to make the front end come up (or really the back end go down), then gassing it in a stoppie (assuming you leave it in gear) will bring the *** end down (I only advise stoppies in neutral for the sake of the tranny). So if you hit the rear brake, you're causing the rear end to go up.


Also, it has a lot to do with stability. The rear wheel spinning is 80% of a bikes stability. That's why bikes aren't necesarrily so stable at 1mph, if you can dig that. Doing a stoppie makes the bike inherently unstable and I would think that you'd want as much stability as possible.. especially when really getting slow.

 

You have it backwards. A moto-x guy gases it in the air to bring the rear up and the front down. And I didn't say gyroscopic effect had nothing to do with stability. Re-read my post.

 

Ok.. so if you gas it in a wheelie your front isn't going to come up at all?