|
Post by superonionknight12 on Jan 29, 2013 9:18:12 GMT -5
I have a 150cc scooter that I just put in a new carb and set the air/fuel screw in (still kind of lean, need to fix that) and for a week it was fine. Yesterday, I was able to ride perfectly in the afternoon but as soon as work ended I started it, rode it for a bit, hit a speed bump and not immediately afterwards but soon it started bogging down and not accelerating on throttle. I took it to the side of the road and allowed it to die and tried to restart the engine. The engine would start and idle but still wanted to die and then would immediately die if I gave any throttle whatsoever. I've been told that the carb could be flooding. I've had my share of dealing with air leaks, but never anything this odd. -I have a good set of vacuum hoses/fuel lines and they were securely connected -I am slightly lean as I've not been able to adjust the air/fuel since I replaced the carb -new auto choke along with the carb Could this be an issue with the fuel petcock or could have something came loose after I hit the speed bump? Thanks in advance!
|
|
|
Post by superonionknight12 on Jan 29, 2013 9:20:52 GMT -5
For more details about the bike: -all stock except: *new carb with autochoke *fuel/vacuum lines *fuel filter
Bike has about 3000 miles on chinometer.
EDIT: If this helps, the vacuum hose that connects to the intake manifold is stained with a dark brown color (more than just air running through?) more to the ends of the intake manifold and as you go back up to the t-connector it becomes clear.
|
|
|
Post by superonionknight12 on Jan 29, 2013 14:24:02 GMT -5
Thank you Tortoise for the response.
When you mean drain the fuel, you're referring to the carb drain screw and hose correct? And by tapping do you mean I should jiggle the carb a bit to get the valve to get unstuck? That may be the issue considering that everything is in check with a good fuel filter. I really doubt there is any plugging in any of the jets. The hit on the speed bump (which was pretty rough) may have messed with the float valve.
If my phrasing of my questions reveals that I misunderstand, please correct me, but I have read about the float bowl in the carb. I just haven't ever had to directly deal with it nor did I even know there was a valve in that area.
But that hypothesis seems to make sense. I'll try to drain the float and see if I can't do something about the valve (without taking it off of course).
|
|
|
Post by yosemite on Jan 29, 2013 15:36:34 GMT -5
With a big bump like that the valve may have come out enough to get stuck in the open position. You may have to bite the bullet and take the carb off or loosen the clamps and just rotate it enough so that you can take the bowl off and check the valve. Sam
|
|
|
Post by dyoung1167 on Jan 29, 2013 16:53:18 GMT -5
this often happens and it is usually the retainer clip in the slide that holds the main needle causing it to drop into the carb.
|
|
|
Post by superonionknight12 on Jan 29, 2013 18:00:38 GMT -5
Ok, so it took me a while to test out everything on the scooter since it's at my work, but I did get to test out some things: 1.) Checked and tightened vacuum/fuel connections 2.) Examined gas tank for rust and found none 3.) Tightened wire connections for auto choke and CDI 4.) Drained Float bowl 5.) Tested and confirmed the fuel petcock functions 6.) Checked air filter During my process, it started out as idling fine with a hint of wanting to die and eventually dying (about 20 seconds) and always dying at the slightest hint of throttle. After a bit of tinkering, it went to idling less and less until it would only catch a little but not start. I've been having a slight oil leak that I have been keeping an eye on and refilling every ride. I replaced gasket, but that continued. Why I mention this is because it may have to do something with this issue though I have had this leak for weeks. All I can think is that the carb is clogged somehow (good fuel filter in scooter for about 500 miles) or the suggestion that the valve was stuck. I also have that dark color on the vacuum line that goes to the intake manifold which I'm not sure if it's normal (smells like oil). I sure won't let this scoot stress me out, but if anyone has any more good suggestions feel free to input.
|
|
|
Post by superonionknight12 on Jan 29, 2013 18:05:16 GMT -5
Thank you guys very much. This shouldn't be too hard of a task. The only thing is that these stock carbs with their standard screws always seem to easily strip so I'll have to deal with those. Hmmm....I might replace the carb with my old one (clogged pilot jet) and detach this one and do that. That seems to make sense so I'll try that.
|
|
|
Post by superonionknight12 on Jan 29, 2013 18:32:53 GMT -5
And just to make sure I understand, I watched this video on how to clean a carb to learn about the various parts. For the float, there was also a pin with it. Is that the "float valve" that has somehow been adjusted wrong and no longer stops fuel flow? www.youtube.com/watch?v=wK67F0P6kj4
|
|
|
Post by superonionknight12 on Jan 30, 2013 13:20:41 GMT -5
I just finished switching out carburetors (now my old one with clogged pilot jet) and so now I'll fix the float bowl valve on this other carb. I also got the scooter to run the way it was with the other carb.
Quick question: why does it take some cranking after switching carbs to get it to start starting up normally? Is that the fuel system getting adjusted? Also, I did check valve clearances and they were fine (.004"/.005").
|
|