| Author | Message | ||
     Spike |
Anyone else had trouble with starving the fuel pump during hard braking? I've noticed mine will stumble and occasionally completely stall after a hard stop. This morning after a particularly hard stop the bike completely shut off and it took a good 10-20 seconds to get it to fire again. Mike Luddy, Jr. '04 XB12R Firebolt '94 FMII Turbo Miata (still for sale) | ||
| Dcmortalcoil |
It happen once on my 03XB9S - hard braking with clutch lever pulled on uphill, stalled the engine. Took several tries before restarting. I though it had to do with the bank sensor. | ||
| Rd350 |
Have the same problem on my 03. From my understand a common problem with all XB models. Just take it easy and give yourself more room to slow down. | ||
| Torqer |
I have an XB12, break hard a lot, and suffer from the same problem. If the bike has less than 1/2 tank, when I break hard it seems like all the fuel flows forward, starving the pump. Go to your local auto parts retailer and get a high volume in-line fuel filter. It, being a self-contained fuel cell, will not be effected by the inertia. While the rest of your fuel is hanging out by the gas cap, the engine will draw from the filter. Now if you should run the filter dry before you get fuel flowing again you will experience hesitation. pete | ||
| 420at145mph |
or just wack the throttle a cpl times with the clutch in solved it for me | ||
| Stefan_f |
You can use a special tank-foam to solve the problem. This foam is used in the tanks of race-bikes, too. Put it around the fuel-pump and your engine will never stumble again. Stefan | ||
| Spike |
On my way home from lunch I stalled the bike again under braking, this time with only ~35 miles ridden on that tank of gas. This really seems stupid. Of course, I rarely ever need to stop that hard, but what's the point of strong brakes if you can't use them without stalling the bike? Anyone know what the pro-thunder guys are doing? Are they using the tank foam? Mike L. '04 XB12R (will trade for Mille) '94 FMII Turbo Miata (will trade for sedan) | ||
| Johnnyxb9 |
Spike are you talking after rolling out long stoppies or just hard breaking. Out of habit I always blip the throttle on down shifts and right before I lift the rear wheel(dont ask me why) and Ive never had a stumble.  | ||
| Fullpower |
craig jones did a front wheel stoppie for something more than the previous world record of 600 feet. from a speed of 120 mph. on a (supposedly) stock xb9. i am pretty sure his engine was running at the end of his stunt. | ||
| Dcmortalcoil |
But a stoppie doesn't result in the bike stopping right away. More g force is applied to the bike when stopping, right? | ||
| Spike |
Johnny, I've only ever had the problem under really hard braking. I don't do long rolling stoppies, so I can't say if that causes the same stalling. Craig Jones' stoppies do make me wonder though. Even if he wasn't stopping very hard, he's still got the bike at a steep enough angle that all the fuel should settle at the front of the tank away from the fuel pump. Unless he's doing it with a full tank of fuel, I don't see how he's not having the same problem I am. Mike | ||
| Stealthxb |
FYI... Stunting Terminology: Stoppie = going up on front wheel while stopping Endo = going up on front wheel while moving | ||
| Wyckedflesh |
It has happened to me only when I have had to do VERY hard braking. The first time it happened the rear never left the ground, the second time a few days ago the rear came off. The engine shut off like I hit a kill switch, not a fuel sputter. It was my thought I had tripped the bank sensor. | ||
| Johncr250 |
Its happened to me a few times too under very hard braking. I didn`t think that it was the fuel pump because it never sputtered, it just shut down instantly. I figurted it was the Bank sensor? | ||
| Fullpower |
no it does not sound like a fuel problem. did the bike restart when you hit the starter, or did you have to cycle the ignition key switch off and back on? | ||
| Wyckedflesh |
Recycle the key, the starter wouldn't do anything at all both times, forgot to mention that in the previous post, my bad. Once I turned the key back on it started right up. | ||
| Xbolt12 |
Your problem also could be from over-filling the frame with fuel which will probably cause fuel to go into the carbon canister, creating a rich mixture problem. Also it may slosh over the lip during heavy braking. Just a theory mind you, but I have typically noticed this problem only after fueling the bike. I am almost out of front brake pad at 6k on my xb12r and I frequently brake hard before turn-in on a corner. xbolt12 | ||
| Paulinoz |
"Go to your local auto parts retailer and get a high volume in-line fuel filter. It, being a self-contained fuel cell, will not be effected by the inertia. While the rest of your fuel is hanging out by the gas cap, the engine will draw from the filter." Is not the reason to have the pump to supply pressurised fuell to the injector if so how does engine draw fuell when pump is sucking air. | ||
| Unibear12r |
If you have to recycle the key its the bank angle sensor. It's in the manual in the ignition section. Just read it today. I don't think there is anything wrong at all, just a hard stop to get it sensitive then a small bounce to the side like a bump or suddenly putting your foot down. Mine did it once quite awile back when I did a VERY hard stop and then landed on my right foot hard at the end when the bike stopped rolling. Thats when the engine stopped like I hit the kill button. At first I thought I had. It fired immediatly once I recycled the key. edited by unibear12r on June 04, 2004 edited by unibear12r on June 04, 2004 | ||
| Trojan |
This used to happen to us all the time when we first started racing. We got round it initially by running with a full tank all the time. Using Xplosafe foam in the tank works. | ||
| Ingemar |
Is this still the case? I thought buell fixed that on later models? | ||
| Starter |
Nope my 2004 does it. A mate had a very near miss just yesterday after I warned him not to do stoppies till he got fuel. He did a stoppies coming into a corner then tried to peg it through the corner. No fuel, no go. | ||
| Dj_rider |
i let my gfs dad ride the bike today...hes a buell addicted as well...it was low on petro and he was tryin to show off by slamming the brakes to stop and he stalled it...heheehe thats okie thou, i think he had fun  |
