| Author | Message | ||
     Blue02m2 |
I've got intermittent symptoms which act as if I am running out of fuel ... except I'm not out of fuel. If I jack with the throttle in a desperate attempt to stay out from under the truck behind me I get backfiring and a surging effect complete with a less than confidence inspiring pogo stick hop of the front wheel ( at 70mph 10 feet in front of a truck this will totally wear out a fresh change of underwear. ) I'm wondering if the float is intermittently sticking with the valve closed and my frantic jacking with the throttle is coaxing the last of the gas out of the accelerator pump?? Sound like a reasonable theory? So far, every time, the bike winds up dying but in a few minutes I’m able to restart it and get back underway. I've never worked on a carb but am well on my way to memorizing the shop manual as I am nearly out of fresh underwear. Any tips? | ||
| Henrik |
Could it be a stuck gas tank vent valve? They were recalled some years ago. Next time it happens pull over and pop the filler cap. If you get a woosh of air, you have vacuum in the gas tank, which will give you similar symptoms. Henrik | ||
| Reepicheep |
And check the spark plug wires (both where they go to the spark plugs, and where they go to the ignition on the other end) and make sure those are all clean, snug, and in good shape. Make sure the plugs are clean and in good shape as well, if in doubt they are cheap and easy to get at on a Cyclone, so just replace them. Oh, and unless you are sure it is the engine, consider the tire and tranny as well. The "snap" of the bike when you dump on throttle was caused on my M2 once by worn dogs (second gear only) and once from making the mistake of buying a Dunlop D220 rear. And did you do the standard carb jetting and air fuel mix changes from the knowledge vault? Those help as well. (Message edited by reepicheep on July 12, 2005) | ||
| Rick_a |
It sounds like the gas tank vent. Check the valve and check the hose for kinks or obstructions. I have the recall vent valve on my bike and it doesn't work worth a damn anymore. I'm probably gonna just put a regular straight fitting on it. | ||
| Blue02m2 |
Vent valve eh<Homer Simpson voice> ... hypothetically if someone were to unwittingly pinch the hose from this guy with a wire tie could that cause this problem? I've already swapped plugs and wires and simulated the problem by turning off the petcock with the bike idling and rolling on the throttle when it starts to sputter. I think its fuel supply. | ||
| Blue02m2 |
Henrik, Rick_a, Thanks! There is absolutely no way pressure was equalizing through that vent valve that has to be the source of the stall. I guess that makes sense – I’ve been going nuts looking for a pattern. Even though I had taken the gas cap off to check for fuel each time it stalled, it always stalled when I had less than a half a tank of gas. I guess the weight of a full tank was enough to overcome the vacuum in the tank and continue to trickle into the carb.. I bored the guts out of the valve with a dremmel and reinstalled it. Unfortunately I pulled the carb and started cleaning it before I took your advice … and now I’ve got to put it back on to try out the improved vent valve. | ||
| Buellistic |
BUELLers: Bought a 97 S3T new in 1997 ... One of the first things that was going to cause trouble was the gas tank vent valve ... So "i" took the little check ball out while everyone complained about running out of gas and after after opening the gas cap everything was OK ... Later on the FACTORY(BMC) did a recall to replace the VENT VALVE ASSEMBLY ... Well, this is still a problem(along with pinching the vent valve hose) and my VENT VALVE with the little ball removed is still working as "i" have never had this problem ... In BUELLing LaFayette (Message edited by buellistic on July 13, 2005) | ||
| Rick_a |
But the safety! If your bike falls over it'll catch fire! JK | ||
| Bomber |
makes it easier for EMTs to find ya! | ||
| Davefl |
The bike has been over  , more than once ( it has the scrapes to prove it). No fire yet . | ||
| Buellistic |
While we are talking about safty ... We all have have our THROTTLE CABLES CLAMP part numbers(the new BUELLschitte numbers)C0130.L Clamp CO129.L, and AN0604.2ZX screw installed ??? This little item holds your THROTTLE CABLES in Bracket 27316-88 ... That was the second thing done was to SAFTY WIRE my CABLES to said BRACKET 27316-88 and was posted early on, this BOARD ... NOW what about the SHOCK under the engine ??? There was a recall on these because shocks with the ALUMINIUM eye ends were braking ... The ones with steel did not, BUT BMC replaced(SHOT GUNNED) everyones !!! "i" am still running my original because "i" did the MAGNET TEST ... GUESS WHAT, if this SHOCK comes apart the result will be the same as an EYE END breaking ... There was a recall on SWINGARMS, "BUT" it did not have a STOP to keep it from doing the same thing that would result from a ALUMINIUM EYE END breaking ... Of course YOU'LL lubricate both ends of YOUR shocks when YOU'LL do YOUR preventive maintaince, BET YOU DO ... In BUELLing LaFayette | ||
| Rick_a |
I gutted my fuel valve over the weekend. What a POS. I still wanna find a proper fitting for it. | ||
| Ceejay |
Rick a or anyone else gutting fuel valve, I did this a long time ago, but you must remember that you did it if you ever remove your tank??? Especially when there is a good amount of gas in there, plug it or make sure it is level or put the hose on the end, something to make sure that you gas doesn't run all over the front during the night and you come out in the morning needing a new paint job.... | ||
| Rick_a |
No problem. My tank finish is all Duplicolor Bumper Coat. | ||
| Ceejay |
yea, mine used to be orange with a white racing stripe, then after a rocker box gasket repair and little thought to the gas tank, it became flat black and turned into the colors in my profile. It would probably still be orange if that hadn't started it all. That bumper coat is prolly pretty durable huh? | ||
| Rick_a |
Flat black...that is a color that I could paint everything with. The bumper coat rocks. I can tell you it takes a hard hit with the asphalt to take that stuff off! |
