Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 13, 2016 10:42:43 GMT -6
hi all i have a longjia 125cc scooter that no matter how hard i try it will not start. i have put a nee carb and starter motor on it yet still nothing. the bike has spark and also has compression yet just will not catch. any suggestions would be appreciated
|
|
|
|
Post by Alleyoop on Mar 13, 2016 12:34:08 GMT -6
Turn the fuel ratio mixture on the carb clockwise until it stops then turn it counterclockwise 2 1/2 turns.
Also how did you test for SPARK?
When did it last run and what happened did it fall over or did you change something etc..
Alleyoop
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 13, 2016 12:43:43 GMT -6
Turn the fuel ratio mixture on the carb clockwise until it stops then turn it counterclockwise 2 1/2 turns. Also how did you test for SPARK? When did it last run and what happened did it fall over or did you change something etc.. Alleyoop hi i tested spark by putting it on top of cylinder and cranked engine with electric start. i last run in december as it just died on me in rain and would turn over so changed starter motor and the carb and since then it turns over but thats it |
|
|
|
Post by Alleyoop on Mar 13, 2016 12:50:22 GMT -6
Ok, just wanted to make sure you tested for spark on the motor, many test for spark on the frame and that is not good enough because if the motor is not grounded it will not spark while in the motor.
Sounds like a fuel delivery problem, so try this take the AIR FILTER OFF and put your hand over the inlet to cut off most of the air and crank it and see if it fires.
Alleyoop
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 13, 2016 12:56:22 GMT -6
Ok, just wanted to make sure you tested for spark on the motor, many test for spark on the frame and that is not good enough because if the motor is not grounded it will not spark while in the motor. Sounds like a fuel delivery problem, so try this take the AIR FILTER OFF and put your hand over the inlet to cut off most of the air and crank it and see if it fires. Alleyoop i did disconnect the fuel line at the carb earlier and cranked engine and fuel came out of pipe so i guess it must be delivering to the carb ok shudnt it. one thing i did notice it after i turn engine over a pipe that goesfrom inlet manifold to air filter releases air by air filter end. |
|
|
|
Post by Alleyoop on Mar 13, 2016 13:03:16 GMT -6
Gas can be getting to the carb but not into the motor. AH, that sounds like a VACUUM hose and ALL VACUUM HOSES MUST NOT BE OPEN they must connect to something.
Can you take pictures of your carb area and hoses sounds like something is not connected or connected wrong.
Alleyoop
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 13, 2016 13:08:18 GMT -6
Gas can be getting to the carb but not into the motor. AH, that sounds like a VACUUM hose and ALL VACUUM HOSES MUST NOT BE OPEN they must connect to something. Can you take pictures of your carb area and hoses sounds like something is not connected or connected wrong. Alleyoop il take some pics tomorrow when im home from work as its dark out now here in uk. thanks for the help so far |
|
|
|
Post by Alleyoop on Mar 13, 2016 13:15:13 GMT -6
Great, if you have spark and compression it is a simple fix just a fuel delivery problem.
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 14, 2016 13:22:54 GMT -6
Great, if you have spark and compression it is a simple fix just a fuel delivery problem.  |
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 14, 2016 13:23:47 GMT -6
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 14, 2016 13:26:36 GMT -6
sorry for poor wuality as its dark here in uk and only just got home from work. tried covering were air box goes into carb and still nothing. on the pics the small pipe thats going into airbox is yhe one that sounds like air leaking after i turn engine over
|
|
|
|
Post by Alleyoop on Mar 14, 2016 13:58:58 GMT -6
That pipe if you follow th4 hose connects to a CANISTER and the CANISTER should have a VACUUM hose and another hose that probably goes to the top of your gas tank which is a VENT for the gas tank and all it does it traps fumes and sends them back into the air inlet to be burned again. How long has it been since it last ran? If it has been months then the problem is the carbs PILOT JET is clogged with varnish and cannot suck gas into the motor. In which case you will need to take the carb off and clean out the carbs jets and passages. You can also check if FUEL IS GETTING TO THE CARB, take the fuel hose off the carb and stick it in a CUP and crank it over,Fuel should stream into the cup. If it does then most likly the Pilot Jet and passage are clogged. I have a tutorial on how to clean it out it is very simple and easy. I will post the link here: scooterdoc.proboards.com/thread/12495/clean-carb-jets-passages |
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 14, 2016 14:05:54 GMT -6
That pipe if you follow th4 hose connects to a CANISTER and the CANISTER should have a VACUUM hose and another hose that probably goes to the top of your gas tank which is a VENT for the gas tank and all it does it traps fumes and sends them back into the air inlet to be burned again. How long has it been since it last ran? If it has been months then the problem is the carbs PILOT JET is clogged with varnish and cannot suck gas into the motor. In which case you will need to take the carb off and clean out the carbs jets and passages. You can also check if FUEL IS GETTING TO THE CARB, take the fuel hose off the carb and stick it in a CUP and crank it over,Fuel should stream into the cup. If it does then most likly the Pilot Jet and passage are clogged. I have a tutorial on how to clean it out it is very simple and easy. I will post the link here: scooterdoc.proboards.com/thread/12495/clean-carb-jets-passageshi again, it last ran in december and cut out in rain and wouldnt even turn over after that. i fitted new starter motor in january and only last week put a new carb on so i cant see the jets bein blocked as its new |
|
|
|
Post by Alleyoop on Mar 14, 2016 14:14:18 GMT -6
Ok, then first check if fuel is flowing to the carb, take the fuel hose off the carb and stick it in a CUP and crank it over,Fuel should stream into the cup.
If it flows then since you got a new carb, PRE-SET the fuel ratio misture:
1. Turn it clockwise and count the number of turns until it stops.
2. If 2 turns or less TURN IT COUNTER CLOCKWISE 2 1/2 turns and see if it fires.
3. If it does not FIRE take the plug out and see if it is WET OR DRY.
Alleyoop
|
|
Clinician
Currently Offline
Posts: 22
Likes: 0
Joined: Apr 24, 2013 7:47:55 GMT -6
|
Post by jake6302 on Mar 15, 2016 11:57:20 GMT -6
fuel flows to the carb so put it bk on carb. turn air/fuel mixture screw goes in about 3.5 full circle rotations til it stops. how man full circlesanti clockwise shud i turn. its really doin my head in as i just want to be able to ride to work and save gettin public transport haha
|
|
..BAD TO THE BONE..
