I am trying to get a 50cc scooter running after it sat for roughly 8 months. I drained the fuel, replaced the fuel filter, cleaned the carb, and replaced the spark plug. I also did a compression test which came out to 150 psi. I have a spark when I test the plug against the valve cover also, yet still can't get it to fire up, it sounds so close. I sprayed some brake cleaner into the carb to see if it would run for a second or so, but nothing. The timing seems right too (T mark and 2 holes on timing chain sprocket line up).
Any ideas on what else I may be missing? I am not sure what else it could be.
Also, I noticed the brake light is always on when the key is on, and both wires (yellow and black) going to the brake switch have power. I am not sure if this relates to the starting issue.
I appreciate all the responses! I am still trying to figure it out. I took your guys advise and went and got starter fluid, but it yielded the same result. I thought before it was a fuel issue, and the plug appeared dry the other day so I had cleaned the carb out again, taking the jets out and clearing them out as well. But if it was a fuel issue I would think the starter fluid would make it run? I could be wrong.
When I put my hand over the intake side of the carb, it seems to draw up fuel because my hand gets wet with gas. Also, the vacuum line to the fuel petcock seems to work. It had bubbles in the filter when I would blow into it, and it flowed freely when you suck on it. I checked the drain on the bottom of the bowl and it seems to have fuel.
I'm not sure how to tell the color of the spark. It seems ok to me, with what looks to me to be a bluish white constant spark. But it seems like it would make sense that it may be something with the plug simply because the engine has compression and fuel, even if it was just for a second with the starter fluid.
I sprayed fluid onto the plug when I was testing it against the valve cover,and it caught fire, which is what I was going for, but maybe its not enough under the compression of the engine?
TERRA NUVO, you had mentioned the reed valves as a possibility? How would I check that?
I've been praying to the scooter gods for about a week now, maybe I should step it up with some candles and a tranquil atmosphere lol.
Oh ok, thanks! Well I will check the valve clearance and post back on the results.
I forgot to mention too about the brake switch again. I guess though if that was an issue, it would keep a spark from happening at all, I'm guessing. But I know it was suggested that the brake switch was bad, which I first thought. But when I disconnect the wires from the switch, the wires are both still hot. I have only found one switch, on the rear brake lever, unless there is another that is giving this one power. I figured the black wire was the hot wire and once the brake was depressed, the switch would power up the yellow wire as well, sending the power to the brake light. I was wondering if maybe since both wires are powered that it could be causing some sort of short.
Plus, I was expecting the rear brake light wires (brown, green, yellow) would be a hot a ground, but it seems the brown and green are the ground, and the yellow is hot from the switch. Does that sound right? I thought the green would be ground and the brown would be hot, since it branches off to the license plate light.
I am just thinking out loud basically but am throwing that out there because it seems somewhat questionable, and I know these things have switches so you have to hold the brake and many times have the kick stands up for it to start.
Once again though, it may have nothing to do with it not starting since I am after all getting a spark.
The switch will either stop it from cranking with the starter or stop spark Being you have spark we can rule out the kill or brake switch i say to disconect the bad one so you dont drain the battery the stop light draws enough to draw some scoots down if stuck on
So now it is narrowed down to a massive vacuum leak timing/valve train or pluged exhaust
Check your valves then make sure the keyway on the flywheel didnt break
ride it like you stole it
2008 zuma with rally kit custom red paint chopped fender dual headlight mod kosos mirrors liquid cooled FUEL INJECTED and a lot of freaken miles 2008 stella 1979 tomos
I checked the valves, the exhaust valve seemed a little tight so I adjusted it. Still won't start. I will check the key in the flywheel tomorrow. However, when I turn the flywheel I can see the timing chain and valves move, would this suggest that the key isn't sheered? Or would I still need to check it?
Also, are there any typical areas where there could be a vacuum leak? The only vacuum I can find is from the petcock to the intake.
The manifold the carb is on is normally a rubberized plastic that frequently will crack, if it is not bolted down firmly to the head you can have a leak there. Look for a nipple that is open to air. All these would be on the carb or downstream from it.
gy6forlife: I am jason from Noblesville out in the corn fields and I am having a hell of a time getting my VIP 2007 W/A BBK TO PULL RPMS WITH ME ON IT,IT RAN LIKE A TOP FOR OVER 3 YEARS AND 12k MILE B 4 THE ISSUES STARTED AT THE CAR WASH,NOW THAT I HAVE IT BACK UP AND
Feb 16, 2013 16:33:12 GMT -5
gy6forlife: TRANSPROTATION FOR ME TO GET TO WORK AND MAKE MONEY?i HAVE ALL THE AFTERMARKET STUFF ON THE SHELF TO INSTALL BUT NOT TILL i GET THE WEAK PERFORMANCE OUT OF IT?PLEASE HELP MAN,THANKS FOR ANY INPUT YOU HAVE,AS YOU SEEM TO KNOW A TON ABOUT THESE ENGINES AND V
Feb 16, 2013 16:55:25 GMT -5
gy6forlife: VARIATORS AND SLIDERS AS I HAVE THEM ALL READY TO INSTALL BUT DONT WANT TO TILL IT IS RUNNING WELL AGAIN?I AM NEW TO THIS ,I TOOK IT TO THE CAR WASH,BIG MISTAKE,AND BURT UP STATOR,NOW RUNNING AGAIN,AND W/BBK 80CC VERSION FROM SCRAPPY?IT STARTS AND RUNS GRE
Feb 16, 2013 16:57:34 GMT -5
gy6forlife: GREAT ON STAND,ON THE WHEELS IT WONT GO PAST 20MPH?i TRIED THE #85/#35 JETS IT JUST STUMBLED AT ALL INTERVALS?i NEED THIS TO GET TO WORK MAN,IF YOU HAVE ANY THING TO INPUT,I THANK YOU FOR YOUR INPUT AND TIME,GY6FORLIFE,JASON
Feb 16, 2013 16:59:33 GMT -5
gy6forlife: IT NOW HAS THE STOCK JETS AND IT RUNS GOOD ON THE KICK STAND AND UNTILL I TRY TO RIDE IT ,IT IS A TOTAL DOG SHIET MAN,i DONT KNOW WHAT ELSE TO DO MAN?PLEASE HELPME?YU ARE A PRO AND MAY KNOW HNOW TO FIX IT?
Feb 16, 2013 17:01:27 GMT -5
gy6forlife: I HAVE SET A SIDE A koso PERFORMANCE VARIARTOR AND REAR LARGE/AND 3 SMALLER SPRINGS TO INSTALL ONCE i GET IT RUNNING CORRECTLY,BUT i PUT IT BACK TO STOCK TO START AT A KNOWN POINT?? EVEN THE CARB AND,i DID DO SOME PORTING TO THE HEAD JUST TO CLEAN UP THE C
Feb 16, 2013 17:06:42 GMT -5
gy6forlife: AS I BOUGHT ALL THE PERFORMANCE ,CDI,COIL,SLIDERS,GATES BELT,REAR 4 YELLOW SPRINGS AND I HAVE PULLED ALL THAT OUT AND PUT BACK TO STOCK,TO START FROM NORMAL CONDITIONS":??? CAN YOU HELP ME OUT MAN,AS i LOST ME JOB DUE TO NOT BEING ABLE TO GET THERE?ANY INF
Feb 16, 2013 17:12:17 GMT -5
gy6forlife: ANY INFO IS GREATLY APPRECIATED AND NEEDED MAN?THANKS FOR YOUR TIME AND UNDERSTANDING.Jason/GY6FOR LIFE ,ITS ALL BACK TO STOCK BUT THE BBK"SO IF YOU CAN i WILL BE OF GREAT UNDERSTANDING AND APPRECIATE ANY INFO ON WHAT TO DO:?
Feb 16, 2013 17:15:58 GMT -5
pumacyclessteve: the gy6 150 engine needs to have the oil changed more than most other scooters .the simple fact that the metalergy and the alloys are not the highest grade like the high end scooters .the errosoin and general wear down of the internal components.is slowe
Mar 1, 2013 18:51:10 GMT -5
pumacyclessteve: but i have a 150 that i ride hard i mean hard thats 5 years old and still runs like a bad as whith a power pros custom one off exhaust and a big valve head .i will wheelie at most every intersection just out pure confidence in my one trick pony.stay
Mar 1, 2013 19:04:53 GMT -5
Mar 2, 2013 18:49:26 GMT -5
mukradio: Help! I am working on a 50 cc that I can't get it to idle properly. It's starts off way too high and when it warms up, it dies. It's driving me nuts and it's a short trip! Any ideas? I have disassembled the carb and cleaned it, drained and replaced gas.
Mar 7, 2013 15:41:53 GMT -5
westonpersons: Adjust your valves to .006". There should be easy directions on youtube, otherwise just remove the valve cover and turn the flywheel so the engine is at top dead center, then adjust the 'taps' on the cam holder for the .006" gap.
Mar 8, 2013 15:02:33 GMT -5
mr cool guy dude: hi every body.......bananas
Mar 28, 2013 17:55:49 GMT -5