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Post by ftwkirby on Nov 7, 2014 12:14:10 GMT -5
One day while leaving the house the scooter died about a block from the house so i pushed it back and posted a question here for help. the response was to check the coil the CDI and the stator. i replaced the CDI and the coil. So it has been a while and I kept the scooter stored till I could get back to it Last I checked I have replaced the spark plug I replaced the ignition coil and boot replaced the CDI unit and just yesterday replaced the stator. I have tested all connections and it will turn over but won't fire.
I don't want to say that I'm not mechanically inclined I have a Rebel 250 and dont have any problems turning wrenches when it comes to it, but this scooter has me stumped . I just can't figure it out . Battery is good and i tested the connections based on a video someone led me to.. Yeah I'm pretty much stumped and I don't have a way to trailer it to a shop or pay their shop fees any ideas
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Post by alleyoop on Nov 7, 2014 12:34:13 GMT -5
Well you covered just about everything for spark except the PICKUP COIL and Ground from the motor to the frame and the CDI being grounded by the killswitch and or killswitch on the sidestand.
So check for a good ground on the motor to the frame. If good then you want to get your multi meter out and do these tests to find where the problem is.
Alleyoop
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Post by rcq92130 on Nov 7, 2014 12:34:24 GMT -5
My novice's suggestion:
1. Pull the plug, lean it against the crankcase, push the starter. Make sure you actually are getting spark.
2. Just for yuks, and since it's so easy, pull the wires to the coil - 1 at a time - and with needle nose pliers snug the female connector so you are sure the coil has a good connection.
3. Pop the valve cover and check valve clearances (this is my guess of what's wrong).
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Post by geh3333 on Nov 7, 2014 13:53:46 GMT -5
My novice's suggestion: 1. Pull the plug, lean it against the crankcase, push the starter. Make sure you actually are getting spark. 2. Just for yuks, and since it's so easy, pull the wires to the coil - 1 at a time - and with needle nose pliers snug the female connector so you are sure the coil has a good connection. 3. Pop the valve cover and check valve clearances (this is my guess of what's wrong). I agree , if spark and fuel are present then I would check the valves . |
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Post by ftwkirby on Nov 7, 2014 14:30:26 GMT -5
i am not getting any spark. i tried the hold against the case test to see it spark was present and there is none. i want to say its grounding out somewhere but i cant tell for sure i will have to run through it with a better multimeter again. someone said that the ignition cylinder could be grounded out im not so sure since the engine is turning over.
when i replaced the stator i replaced the pick up coil could there be a "clearance" issue with that.
no kill switch on the side stand just up near the throttle alleyoop. and i want to say its working as well. as in it lets then motor turn when in one direction and kills everything when in the other direction.
sorry i forgot i am getting fuel to the cylinder. i have checked and even tried shooting some starter fluid into the cylinder.
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Post by carefulrider on Nov 12, 2014 11:05:36 GMT -5
Below is some information I have gathered from the forums that might help:
Did you check the integrity of the wiring as it/they lead from one electrical component to the next all the way from the stator to the spark plug? If any one length of wiring is not sending the current to the intended component, spark in not going to be present at the plug.
GROUND:
Assuming it is a 150cc, check the wire that runs from above the fan to the frame ground on the bolt behind the battery that has two other wires attached to it. The wire is thin... replacing it with 14 gage is desirable, though not necessary. Without the engine being grounded, it's not going to start. It's very important that all ground wires are clean & have a solid connection. You should have a fat black or green wire running from the battery - to the frame & another ground from the frame to the engine. Check to verify that it/they has/have continuity.
Check all connectors to make sure they are tight before you start. Could possibly be just faulty connections or loose ground also.
Hold the brake handle or tie it in the pulled position. Ensure that the Kill switch is off; that the scooter is on the center stand with the side stand up.
If it does not start, bypass the kill switch. A very common cause of no spark is a defective ignition or kill switch. Before beginning to troubleshoot ignition problems, it is best to bypass the kill switch.
Bypassing the switch:
1. Reference/look at a picture of a GY6 CDI.
2. Create a jumper wire from pin #4 directly to a good grounding spot on the engine.
3. Remove the #5 wire from the CDI plug at the harness. This can be done with a hobby knife blade. Looking from the front of the plug, you will see small metal tabs on each pin which secure them to the plug. Push the tab down & the pin will release. Be careful not to break the plug or pin. Now see if the scooter will start. If not, the kill switch is not defective.
If your high tension plug wire is cracked the spark can jump from the wire to the frame or engine before it gets to the plug. The spark plug cap may be bad allowing the same thing to happen. Of course, ensure that the spark plug is gapped properly.
SPARK PLUG BOOT:
Then check the spark plug boot for looseness.
There is a small electrode located in the spark plug cap, remove the small brass screw inside to find a small spring & a carbon electrode. Sometimes they are burnt & cracked causing a reduction (or elimination of) in the spark. So inspect the  ° cap on the spark plug.
If the carbon electrode is present & in good condition, continue on & check your spark plug high tension wire for continuity.
Hope this helps you get started on a methodical journey to diagnosing the lack of spark at the plug.
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Post by zammykoo on Nov 12, 2014 17:11:13 GMT -5
Have you checked your harnesses? Last time I didn't get spark it was because the ground wire on the CDI harness wasn't making good contact. It looks fine when I unplugged it but I slipped the ground wire off the harness and bent the little tab out a bit so it would press against the CDI pin better. Hope that helps.
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..BAD TO THE BONE..
° cap on the spark plug.