Heh,heh......I always tried to SKIP classes,myself...LOL!
(1)Well,yes,it's normal to have that small gap in the carb venturi(throat)so the `ped can get enough fuel and air to idle.
(2)The problem of running can be starving for fuel because of a dirty petcock screen in the tank(the opening for the `ON' position can be clogged),so start there by removing the petcock after FIRST checking that the fuel cap IS venting.SOME Express fuel caps have a VENT position and off position.If you have it in the off position,the tank can't vent.
NOTE: I worked on an Express once that if you turned it ALL the way to the stop on the `OPEN or VENT' position,it would NOT vent.You hadda put it just almost all the way to open and it worked.So watch for that.
(3)Take the fuel line off the carb and do your own test to see if the fuel flows and IF it KEEPS flowing for 3 minutes into a fuel can.............if it slows considerably or stops,you have a venting problem.
(4)If the above passes the test,re-install the fuel line and loosen the drain screw on the carb and see if it flows regularly also. If not,you have a restriction between the inlet and the bowl,which can be a fuel inlet filter clogged or a needle valve not opening or clogged seat of the needle valve.
The MopedWhiz always said to get `em running and they should get better as you ride them.
I say the same,but I would add one tablespoon of good CARB cleaner(not injector cleaner)to a tank of gas.
The most probable cause is a fuel restriction.Gasoline tends to gel and clog with long storage where no STABIL has been added or the cap is left to `vent' during storage.
(5)NOW.....if you tried all this,and it has good fuel flow,you need to check for spark when this `no-start'or `quit after running' condition occurs.This is because a CONDENSOR,when bad, can quit after it heats up a little(Motobecanes are notorious for this).
(6)Important! Main thing to do with a moped when the problems occur is to REPLACE the spark plug with a NEW one.You can't tell by looking at one if it's good.They tend to misfire once compression is introduced with wet fuel mixture.
(7)be gentle when doing anything on a moped head or even replacing the spark plug.Don't replace them when the moped is HOT.....wait for the aluminum to become stronger when it cools a LITTLE...maybe 10 minutes.
NOW for the oiling problem:
(A)If starving for fuel it will smoke more when cold.The oil ratio is higher.
(B)Do a search about unhooking your oil pump if you really want to do that.......but replace the existing oil in the tank with fresh,high quality synthetic INJECTOR type 2-stroke oil(I like Pennzoil synthetic or AMSOIL).
Just make sure you have at least 32:1 ratio gas to oil getting into that engine.
I hope all this might help you a little,and GET TO SCHOOL by any means......except scooter(snail)of course!
JUST kidding! don-ohio (:^)
Posted on Oct 30, 2007, 8:50 AM from IP address 207.69.137.25
