|
|
Backfiring
by: alleyoop - Jan 1, 2015 16:44:03 GMT -5
Post by alleyoop on Jan 1, 2015 16:44:03 GMT -5
Oh, ok then it was just moisture not a problem.
Ride safe
Alleyoop
|
|
|
|
Backfiring
by: JoeyBee - Jan 1, 2015 16:56:52 GMT -5
via mobile
Post by JoeyBee on Jan 1, 2015 16:56:52 GMT -5
Thank you for the advice.
I got the scooter by telling my wife it would be more cost effective for my 3.8 mile trip to work instead of the F150. But I also knew it would be a very fun hobby and excuse to turn a wrench.
|
|
|
|
Backfiring
by: geh3333 - Jan 1, 2015 17:49:23 GMT -5
via mobile
Post by geh3333 on Jan 1, 2015 17:49:23 GMT -5
Thank you for the advice. I got the scooter by telling my wife it would be more cost effective for my 3.8 mile trip to work instead of the F150. But I also knew it would be a very fun hobby and excuse to turn a wrench. How about you lain ? Was the moisture in the vacuum line fuel ? It gets a little confusing when someone else chimes in about the same issue. Don't take this the wrong way I'm just saying it gets a little confusing. |
|
|
|
Backfiring
by: JoeyBee - Jan 1, 2015 20:18:58 GMT -5
via mobile
Post by JoeyBee on Jan 1, 2015 20:18:58 GMT -5
How about you lain ? Was the moisture in the vacuum line fuel ? It gets a little confusing when someone else chimes in about the same issue. Don't take this the wrong way I'm just saying it gets a little confusing. I apologize if it appeared that I was chiming in on Lain's topic with problems of my own. My intention was to further discuss the possibilities of why moisture would be in vacuum lines in case Lain notices the same thing. Understandably if fuel is in the vacuum line the petcock diaphragm is leaking. But could running rich cause moisture in the lines? Forum consensus says factory carbs run lean which was where I was at. Maybe both extremes could cause the moisture. Or maybe something else causes it. Either way, I just want to learn as much as I can and avoid similar problems others have had. |
|
|
|
Backfiring
by: alleyoop - Jan 1, 2015 21:02:14 GMT -5
Post by alleyoop on Jan 1, 2015 21:02:14 GMT -5
Don't worry about it joey, did not confuse me , but we haven't heard from the problem child.
|
|
|
|
Backfiring
by: jerseyboy - Jan 1, 2015 21:11:44 GMT -5
Post by jerseyboy on Jan 1, 2015 21:11:44 GMT -5
I stand corrected,,thank you Alley!
|
|
|
|
Post by lain on Jan 1, 2015 22:43:13 GMT -5
[...] From all you say I would say it is getting to much fuel right off the bat. Check the Vacuum hose going to the PETCOCK, pull it off at the INTAKE MANIFOLD and see if it is wet. Also when you did the bbk did you change any of the JETS the one causing this would be the PILOT JET NOT the main jet. Yes, the vacuum line seems a little wet. No, I did not install a new idle jet, however I did upjet the main jet to #  . Before the BBK my plugs always lasted forever and checked out as running normal, after installing the BBK the plugs keep coming out wet and smells sort of like a permanent marker, but stronger. The things I changed when installing the BBK are as follows; the piston, rings, cylinder, head, variator weights, main jet, and gaskets. Is there anything in the stuff that I changed that could have changed the way the idle gas amount works? Don't worry about it joey, did not confuse me , but we haven't heard from the problem child. Umm.. |
|
|
|
Backfiring
by: alleyoop - Jan 1, 2015 22:52:19 GMT -5
Post by alleyoop on Jan 1, 2015 22:52:19 GMT -5
If the Vacuum line coming from the PETCOCK and or FUEL PUMP is wet that means the Petcock and or Fuel pump is bad and allowing gas to be sucked out of the VACUUM line as well as the Fuel hose, so in that case TO MUCH FUEL. And for starting and low rpms the MAIN JET has nothing to do with starting and or feeding fuel at that point so forget about the main jet. It is sucking in extra fuel from someplace and the only other place would be the VACUUM LINE. So let me repeat IF THE VACUUM LINE is wet from FUEL the VACUUM PETCOCK or FUEL PUMP whichever is on there is BAD. And that would explain why it runs good after warm up as well because since you have a BBK it needs more fuel and the extra fuel it is sucking in from the VACUUM is helping it after warm up due to the PILOT JET been plugged and set LEAN. my .02 Alleyoop What UMM is it wet from fuel or not, if so that is your problem. |
|
|
|
Post by lain on Jan 2, 2015 11:04:03 GMT -5
I don't know. Gas smells different, the line also smells like a permanent marker but stronger, but gas alone doesn't smell like that?
It's been hard to get the video for you guys since it usually only happens on the first start of the day and usually no one is around to let me use their phones to record it then.
It is not loud but there is a muffled pop every now and then when at idle speed, sometimes it will cause the engine to shut off while idling, but it starts right back up after.
Is it possible to replace just the pump and not the entire gas tank? I would like to replace it to rule it out.
|
|
|
|
Backfiring
by: geh3333 - Jan 2, 2015 11:59:11 GMT -5
via mobile
Post by geh3333 on Jan 2, 2015 11:59:11 GMT -5
How about you lain ? Was the moisture in the vacuum line fuel ? It gets a little confusing when someone else chimes in about the same issue. Don't take this the wrong way I'm just saying it gets a little confusing. I apologize if it appeared that I was chiming in on Lain's topic with problems of my own. My intention was to further discuss the possibilities of why moisture would be in vacuum lines in case Lain notices the same thing. Understandably if fuel is in the vacuum line the petcock diaphragm is leaking. But could running rich cause moisture in the lines? Forum consensus says factory carbs run lean which was where I was at. Maybe both extremes could cause the moisture. Or maybe something else causes it. Either way, I just want to learn as much as I can and avoid similar problems others have had. its no prob , I didn't want others to think lains problems were fixed. Trust me its not a problem I've done it many times myself. |
|
|
|
Backfiring
by: alleyoop - Jan 2, 2015 12:22:20 GMT -5
Post by alleyoop on Jan 2, 2015 12:22:20 GMT -5
What you said you have a PETCOCK that screws onto the bottom of the TANK is that correct? One like this, if so get a new one and unscrew that one and screw on the new one:  |
|
|
|
Backfiring
by: jerseyboy - Jan 2, 2015 16:15:52 GMT -5
Post by jerseyboy on Jan 2, 2015 16:15:52 GMT -5
Hey Alley,,
Is there a way to bypass that pump on a 50cc,,never worked on a 50 ?
Looks like its part of the tank plug,,maybe if he takes the diaphragm out and plugs the vacuum port?
That would only be sufficient if he has a down hill feed or gravity run from tank to carb inlet...reason being I never had any luck with those petcocks.
|
|
|
|
Backfiring
by: alleyoop - Jan 2, 2015 16:33:09 GMT -5
Post by alleyoop on Jan 2, 2015 16:33:09 GMT -5
Yes those that screw onto the bottom of the tank are a . I usually tell folks with them to convert over to a regular stand alone Petcock and use this to connect to the Tank. So now anytime something has a problem it is out in the open and easy to get at as well.s in   Then replace with one of these:  |
|
|
|
Post by lain on Jan 2, 2015 19:47:27 GMT -5
Okay, cool I ordered a new fuel pump, and some filters as well just to change the one I have out since it's the stock one that came with the scoot. The new Keihin carb should arrive Monday, and I should have time to tinker with it either Monday night or sometime Tuesday.
I'm also going to go to the autoparts store and get some new fuel hoses, what kind do I need? Not sure exactly what I am looking for, I am searching advance auto parts online since they are the closest place, and I can't seem to find fuel hoses.
|
|
|
|
Backfiring
by: JerryScript - Jan 2, 2015 19:59:43 GMT -5
Post by JerryScript on Jan 2, 2015 19:59:43 GMT -5
When you do get back to it, be sure to re-check your valves. Wild hunch, but let us know what your exhaust valve is at when you check it.
|
|
..BAD TO THE BONE..
.