| Author | Message | ||
     Tgroghan |
Recently after riding the bike for a long period of time 120mi continuous and then getting fuel the bike starts back up and idles fine but for the first 1/2 mile it spudders, bucks and stumbles. Like it's not getting the right mixture of air/fuel or something like that. Does anyone else have this problem??? My XB9r has the race muffler as aftermarket motor mods. 3500mi | ||
| Freyke |
Let me guess; it stumbles and sputters from around 3800-4200RPM then picks up again... This means you have the RCM as well... this is a common problem with the race kitted 9s... I've minimized the issue by filling up w/premium (top-quality gasoline)... It still does ir sometime... I know of know real fix to the problem at this time.... Pretty sure the problem is in the firmware mapping of the ECM.... kk//kef | ||
| Tgroghan |
I have the STOCK ECM on the bike. It bucks HARD right after a fill up. But 3/4 mi down the road it doesn't do it any more. | ||
| Lazyme21 |
Mine does the same thing, sometimes. It doesn't do it after a fill up though. I also have the stock ECM on it. | ||
| Hootowl |
Are you filling it up too far? Blocking the vent? | ||
| Lazyme21 |
I would have to confirm that, maybe it is happening to me after a fill up, never paid too much attention to it cause it only happens every now and then. | ||
| Captainplanet |
Hootowl has it right. On my xb and others I have heard of if you fill it too close to the top of the tank, it will do that. | ||
| Tgroghan |
I'll try filling it up less next time. So how far can I fill it up then? TO to top of the frame or past that point? THanks | ||
| Dj_rider |
i fill mine up about a half inch above the lip, with no problemos...just do a few wheelies and eat some of the gas up real quick  | ||
| Stealthxb |
I fill my 12S past that ledge more often than I should. Sometimes I come out of the station to see a little puddle of gas below the overflow hose. However I have not experience any of the bucks and stumbles you mentioned. | ||
| Wyckedflesh |
I fill to the bottom edge of the inner ring. The couple times I have gone over enough that standing the bike up left it above that ring it would stumble as you described. | ||
| Tucsonxb9s |
And pee gas out the overflow tube.....not that I've done that or anything.....  | ||
| Starter |
I fill mine right up till it pees a little gas. The only time the bucking has happened to me was when a mate thought he was doing me favours by filling it a being a cheap ••••••• put rcap fuel in. It carried on for a while till I took it for a bit of a run. | ||
| Fireboltgeo |
You all are talking fuel level when the real problem is putting a race muffler on the bike without changing to the race ECM. Also change the air box filter. The three go together and since we are running fuel injected bikes, changing one without the other two just throws the combo out of sync. IMHO, that is.  | ||
| Tgroghan |
Fireboltgeo, I would of thought the same thing until I got on this bike. IT HAULS butt with that one mod all the rest of the time. I am looking into the FAST breather mod for the future though. ENjoy the ride~ | ||
| Unibear12r |
Gee, and I thought only us California boys had problems when we over filled! | ||
| Freyke |
Allegedly, a bike with the race pipe and no K&N air filter and Race ECM will run lean (too much air - not enough fuel)... this equals hot, hot is bad... and in some cases may explain why your fan seems to run more than it should... the addition of a K&N and cheifly the Race ECM will richen up the air fuel mixture (more fuel to air ratio) and the bike will run cooler.... this in addition to synthetic oil/primary fluid will result in a overall cooler running bike (less fan on)... However, in my case the only down side of this configuration is the occasional 3800-4200RPM stumble that seems to occur un-announced and intermittently... Over time I have attributed this to a fuel quality and ECM firmware (mapping) issue; good/quality fuel and the ECM mapping does not seem to have any issues, with low grade fuel the ECM mapping does not seem to be able to overcome the deficeincies in the combustion process and adjust accordingly... hence the stumble.... Anyway I could be wrong... but somehow I think this is the crux of the matter... Someone needs to hack the ECM and see if they can improve the mapping.... I just don't think the issue has reached "critical mass" within BMC for them to warrent looking into this... Even though it seems to me to be a growing issue with the Race ECM/Kit as a total package....  kk//kef | ||
| Jeremyh |
I Have murdered my airbox, murdered my exhaust and have no K&N filter, I use Fred Meyer Gasoline Premium of course and have had no issues with heat or an excessive fan even on hot days. I have done a ride with some other 9rs and a 12r and the bikes fans all also shut of within a couple of seconds off each other. Oh yea and we all run Syn3. Oh yea and no ECM upgrade (Message edited by jeremyh on August 24, 2004) | ||
| 2k4xb12 |
Allegedly, a bike with the race pipe and no K&N air filter and Race ECM will run lean (too much air - not enough fuel)... Doesn't sound right to me. Race ECM pumps more fuel. Race pipe and K&N counter by flowing more air. K&N flows better than stock, so why would the stock filter with the balance of the race kit run lean? This would imply that the stock filter flows better than the K&N. Now, all this was said under the assumption that you were actually running a filter. Looking back at the original post, are you talking about running the race pipe and ECM with NO filter? If so, then I can see a lean condition. | ||
| Freyke |
2k4Xb12, you're right I misstyped... I ment stock ECM.... sorry for the confusion... kk//kef | ||
| Freyke |
Just to verify my position... Race Pipe + Stock ECM + K&N = Lean(HOT) Race Pipe + RACE ECM + K&N = Rich(Cooler) kk//kef | ||
| Tgroghan |
Running an engine hot isn't bad, but you just don't want it to over heat (critically hot). UNIBEAR12r Oh yeah by the way my 9R is the California model... does this seem to happen to those model bikes more than the others? | ||
| Lazyme21 |
It sputtered again on me last night. The tank is 1/2 full and the bike was cold. When taking off in 1st gear it sputtered like 2 times and then it was fine. I am at a loss here. I have made some mods but nothing huge. I added the K&N added the 12 Airbox and ceramic coated the headers. Any ideas? (Message edited by lazyme21 on August 24, 2004) | ||
| Daveinm |
I think you should give your bike a chance to warm up. It definitely doesn't warm up in the 5 mins/5 miles it takes to get to my house  | ||
| Tgroghan |
WHen you swaped out you headers did you replaced the gaskets between the pipe and the heads? I had a problem with that on one of my other Buells (my fault failure) | ||
| Unibear12r |
On the Cali models the overflow goes to the vapor canister and if you fill past the bottom of the neck the excess will store there. When you next start up the intake sucks up the gas ( instead of just a little vapor) and the O2 sees super rich. This makes the bike run like crap and throw a trouble code for a minute or two. After that the bike is just fine but that minute is a real attention getter. The ecm will remember the code. No problem just don't overfill or if things are really hot forget that gas expands in your tank. | ||
| Tgroghan |
Unibear12r.... That IS IT! That's what has happened before, trouble code popped up. Thanks for the info. I did a suscessful fill up last night without over filling. I'm so proud of myself!  | ||
| 2k4xb12 |
Yeah, that's why some that I know have "converted" theirs to a non-Cali bike. | ||
| Unibear12r |
Yes, I did it in the middle of Death Valley. And I'm thinking TOW TRUCK!?!?!?!?! (For a minute!) Actually you never know its there unless you screw up, it has no other detrimental effect, and as smog equipment goes it has the least effect on operation for the amount of good it does. Mainly I just like the fact that my garage doesn't stink of gas because of it. I don't think its worth removing from my 12R now that I know what to not do. I think it could mount in a better spot on the Cali XBS models tho. Your welcome Tgroghan (Message edited by unibear12r on August 25, 2004) |
