| Author | Message | ||
     Pontlee77 |
Hello, last night I parked the bike in the garage and this morning i found a small puddle of gas under the bike, I took of the air box and all there seemed fine, put it back on, fire the bike and gas was pouring under the bike the carb had a bit of gas but it seems ad is not from there, the amount that came out after firing the bike was maybe 2 or 3 liters, and it was only gas nothing else, any ideas as from where I should start? Thanks and merry Xmas. | ||
| 651lance |
What year is the bike? Is the bike stock? | ||
| S1owner |
Fuel injected or not? If not needle and seat stuck open or float stuck. This is the main reason everyone on any machine shut off the petcock | ||
| 651lance |
If the carb is overflowing check your oil and make sure you didn't get any in your oil. If the carb leaked into the intake it can flow into the heads and pass the valves. Once it in the chamber the gas will slowly get past the rings into the oil. The only good that comes out of this is it cleans your intake valves and the top off your pistons. Check your float needle and make sure the rubber tip is smooth and that the needle has four sides not three. The three sided needles will tend to be loose and not seat properly. If it all looks good check your needle seat and make sure it not loose. The easiest way to do that is take a sharpen end of a pencil break off the tip then stick it against the seat and with some press against the seat try wiggling the seat back and forth. | ||
| Hootowl |
If it is carbureted, always shut off fuel when parked. Also, and I'm not sure this applies to S3s, but check to see whether the fuel inlet fitting on the carburetor is cracked. | ||
| Dave |
2 or 3 liters of fuel! If that's accurate, think fuel line or stuck float (if carbed) DAve | ||
| Buelldualsport |
Original Post says CARB | ||
| Pontlee77 |
The bike is a 97 carbed full stock, when I got it two weeks ago it was leaking some gas from the airobx, i thought it was overfilled the tank and some went trough the vent ( thought it went in the air Box), after a few miles no leaking appeared, and every day parked in the garage with pet cook open didn't see any leak. Until today, to check the carb i suppose I have to take it off, not really in the mood to do it today at least. I'll check the fuel lines and maybe a good time to change them. So when I park the bike I should shut of the fuel from the petcok? Thank for all the fast replies . | ||
| Lakes |
I have not had that happen to my carb M2 it has a CV carb, are you sure carb is stock? does the carb have a float bowl overflow hose or none? | ||
| S1owner |
Yes always turn the petcock off. Also like Lance mentioned it might be wise to check the oil for gas and drain and check the oil. Run some cheap oil through and drain again replace the filter. | ||
| Pontlee77 |
I'll start by the carb and if it's not there I'll dig in some more, the split fuel line sounds quite possible but I need to see, I'll sort it our and when done I'll have an answer. It's a nice bike, but is like night and day compared to the X1. | ||
| Hootowl |
Be sure to check the inlet. The old ones are two piece brass and plastic. The plastic tends to crack. | ||
| Pontlee77 |
After a small inspection all lines look good I turned the tank to open, twisted a couple of times the throttle and looking I saw it stated dripping from the carburetor, now how to proceed take air box off take out the carb, and what should ii do so I don't dis adjust the carburetor? | ||
| Reepicheep |
Two things, first I believe my M2 had a pumper carb, meaning that twisting the throttle (even with the bike off) would force the carb to give a squirt of gas. So I don't know how much you saw or where you saw it, but it could be normal. Secondly, the float and needle are what keeps extra gas from overflowing the carb. So make sure the needle and it's seat are clean and fresh (no grove in the needle) and make sure the float level is adjusted correctly (a hassle). | ||
| Two_seasons |
Might be easy fix. Pull surrounding obstructions away from carb, then tap the bowl firmly with wooden handle of a hammer several times. Worked on my S2T right after I bought it in 2012 and it hasn't leaked since. Don't forget to shut off petcock after ever ride!  | ||
| Brother_in_buells |
This could be also a ethanol corrosion problem ,so think it's a good thing to check and if needed clean the carb! | ||
| Robr |
This has happened several times to me on both my Sportster and my Buell both running the same CV40 carb. The carb needle valve available in the Drag Specialties Complete carb rebuild kit should be replaced. Also the brass needle seat should be polished with a Q-tip in a Dremil or drill and toothpaste or polishing compound. | ||
| Pontlee77 |
Ok started the engine with petcok on off position, carb seems ok, now I've noticed it comes from behind the battery by the low end of the oil tank, smells of fuel and it has no oily viscosity, so I'm a bit confused as I doubt there is any fuel that goes Round there. Not in much of a mood to take the rear end of but if needed I will. Thanks | ||
| Pontlee77 |
The gas comes from the vent that is just behind the battery, I checked the oil tank and it smells of fuel, and iit feels like fuel, so I'm lost. | ||
| S1owner |
Your tranny vent line is back there so sounds like you filled the block with gas and that means do not run the bike at all till you flush it. Take the derby cover off and drain the oil from motor snd tranny. Remove the filter. Put a cheap filter on and fill both with cheap oil. Reinstall derby Cycle motor - I am not sure how long and if you should start it or not on this part. Once done remove derby then drain oil from both remove filter. Install new filter and new oil of your choice. Reason for this is as stated above fuel ran down your cylinders and into your block it thinned the oil and once thinned it gets past the seals into the tranny and thins that oil. Moral of the story- any carbed equipment should have the gas turned off when not in use. This has happened to me with a brand new snowmobile witn slmost 10 gallons because the float stuck. Consider it a lesson learned. | ||
| Ratbuell |
As you were told before in this thread (651lance's post) you should check for fuel in the cylinders and fuel in the oil. 2-3L of missing fuel with no puddles or external leaks...tells me all that fuel went INSIDE the engine by way of (also as mentioned in this thread) an internal carburetor problem. Fuel coming out by the battery means that not only do you have fuel in the oil, it has leaked (or since you started the engine it has been PUMPED) past the crankshaft seal and is now in your primary as well. The fuel spilling out by the battery is from the primary vent tube because now the primary is "overfull" because of the added 2-3L of gasoline. Now you get to drain everything, remove the primary, and install a new seal in addition to rebuilding the carburetor and running fresh oil through the engine and primary to wash out all the gasoline. Please, before you take any parts off the bike, make sure you have an FSM so you can check things properly during the process, and get it all put back together correctly. Also do yourself some research into carburetors in general. Yes, a cv carb will squirt fuel into the throat when you twist the throttle, that is the accelerator pump. No, a carburetor should never "drip" fuel outside its body. Ever. Yes you should turn the fuel valve (petcock) off after every ride. | ||
| Pontlee77 |
Tranny is the primary right? When you mean a new seal, you refer to the gasket of the primary or something different? I've removed a few primaries before, but just to change the gearing never looked out for any seal. Thanks. | ||
| Williamscottrobertson |
It's the crankshaft seal that goes in the crankcase behind the primary that he's talking about. Not the primary cover gasket. (Message edited by Williamscottrobertson on December 27, 2016) | ||
| 651lance |
The crankshaft seal is behind the charging rotor not the clutch. To get to it you'll have to pull the primary cover, clutch, and the rotor. Easy job to do if you have the correct tools. | ||
| Reepicheep |
There are two vents, one for crankcase, one for transmission (separate chambers). I think the crankcase vents are out the heads, so the vent you are looking at is for the transmission. The leaking needle seat we mentioned would absolutely cause the crankcase and oil to be contaminated with fuel. The seal between the crankcase and the transmission is the one Lance is describing, and it a common failure on tubers. Two nice sharp drywall screws and two pairs of pliers are the easiest way to pop it out. Just get the screws far enough in to bite (not very far), then yank the seal out by their heads. But be careful you don't hurt the bearing behind it with the screw or if you drill for the screw. | ||
| Pontlee77 |
Guys you're great and gladd i found this forum many years ago, i know a bit of mechanics and with your help i learn much more, if it was a Fi I guess I wouldent have this issue, but I still remember my old Honda CB 250, also carbed, but nothing to worry just shut of and next day just start it, and never touched the petcok, then went to a Ulysses very good until the crash, actually I lost the feel the last year I had it, then came across the X1 I had tried in the past, and it's the bike I most like, compared to this S3T, is faster, more stable, being tubers they are so different. thanks again for the help. I have some gulf oil for my diesel car, should I use that or flush it with the Castro oil I usually use (15/50). Is there a screw under the crank case where I can drain the last drops of oil (seem to remember there was one. While doing all I'll take the time to put the upgraded exhaust hanger, the bike had a few upgrades. (Primary shoe, frame brace, muller clutch, dual front discs and rear brembo 4pot caliper. | ||
| Harleyelf |
The last few drops of oil in the lower crankcase will pump up to the tank when the engine is started, even if it is fully wet-sumped. Have you taken the petrol tank off and checked the petcock? If the hose to the carb is wet, there are only three possibilities: The carb is leaking at the inlet, the hose itself is leaking, or the petcock is leaking either from the juncture with the tank or from its body. | ||
| Pontlee77 |
I'm draining all the bike, I'll take of the carb and get it serviced as weather is stating to get worse I'll take my time and sort it out slowly. | ||
| Hootowl |
Pop the primary chain inspection cover off and take a whiff. You'll know immediately if you've got fuel in there. | ||
| Pontlee77 |
I took the derby cover off and if was full of fuel,. |
