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Post by necromagrimm on Oct 29, 2014 11:50:14 GMT -5
Hello there all, I've got a stumper... I've had this atm1 50cc for about a year, and for the most part it's been almost reliable, (apart from replacing the carb... couldn't clean it...). I was riding the other day when I started to lose power and it started making a chattering like when a 4 cyl engine loses a cylinder, so I stopped and it idled fine. When I went to take off again, the chatter was gone but I could walk faster, then it quit. Got it home,checked my valve lashings, cleaned the jets, checked for spark, fuel is getting to the carb... what could I be missing? Any and all help or advice is greatly appreciated. Btw, my first scoot ever. Noob!
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Post by katastroff on Oct 29, 2014 20:49:36 GMT -5
Compression?
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Post by alleyoop on Oct 29, 2014 21:01:43 GMT -5
If you can twist the throttle and the RPMS go up but does not move good rthen check your CVT take the CVT cover off and check your belt and rollers.
Alleyoop
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Post by necromagrimm on Oct 29, 2014 22:23:16 GMT -5
katastroff I need to see what I'm getting compression wise... someone at school said something similar. alleyoop ,it turns over and wants to start (from the sounds of it) but it still won't run for more than a second or two... bad rings already? or a cracked piston? When I pulled the plug everything kinda flaked off of it leaving it stark white... if that helps....
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Post by alleyoop on Oct 29, 2014 22:43:40 GMT -5
Oh, it doesn't start then, ok if you do not have a compression gauge use the finger test. Stick your finger in the hole and HOLD THE THROTTLE wide open and crank it. If it has descent compression it will LIFT your finger off the hole if you just feel some pressure then the compression is LOW. Since you have the plug put check for Spark hold the plug on the valve cover and crank it and see if the plug is firing.
If the compression did not lift your finger off the hole then adjust both valves to .003 inchs and re-check compression with your finger since the plug is still out. If it still will not lift your finger off the hole then you have internal problems and time for a rebuild.
If it lifts your finger off the hole put the plug back in and try starting it. If it did not FIRE once take the plug out IF the plug is dry then no fuel is being sucked into the intake. So now check for vacuum and or fuel delivery problems to the carb.
Alleyoop
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Post by necromagrimm on Oct 30, 2014 0:09:10 GMT -5
alleyoop , I definitely could not hold the compression with my thumb covering the spark plug hole. I rechecked for spark against a good known ground, and there was spark. When I reinstalled the plug and tried it again and pulled the plug it had a coating of soot on it, but it was not wet. Also, the smell from the exhaust smelled like unburned gas... not raw gas, but a mix of gas and a bad carbony type smell.
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Post by necromagrimm on Oct 30, 2014 0:14:19 GMT -5
I took the carb loose and it's full of gas... the carb is about a month old and I use that blue enzyme gas treatment and the "good" gas,  octane... 31 for the pilot jet and an 81 main jet. When I took it apart earlier today,I cleaned it all just to make sure, and no residue on anything, it felt like it wasn't getting fuel when it was chugging along on Monday,but it's getting fuel... |
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Post by necromagrimm on Nov 10, 2014 20:27:15 GMT -5
OK, I've got the scooter to idle finally, and sounds great, but if I give it gas it bogs down and makes a skipping noise along with some odd clunking sounds. I checked the variator weights, thinking that when it got some higher rpms, the weights were stuck or something, but they're not. Checked the clutch, that appears to be fine. Valve springs? I don't think they should be bad already (1200 mi). Valves clearances are set to .002 intake, and .0025 exhaust.
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Post by alleyoop on Nov 10, 2014 20:45:10 GMT -5
Bogging is to much air being sucked in and not enough fuel. So you either have an air leak someplace, intake manifold cracked, Air Filter tubing cracked, no air filter etc.. OR you need to adjust the Fuel Ratio Mixture. Now if the plug is sooty then that is TO MUCH fuel and it is being flooded.
So check what you have a clean plug or still a sooty plug. If sooty also check the vacuum hose attached to the petcock it may be sucking gas through the vacuum hose which would mean bad petcock.
Alleyoop
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Post by geh3333 on Nov 10, 2014 20:59:47 GMT -5
I took the carb loose and it's full of gas... the carb is about a month old and I use that blue enzyme gas treatment and the "good" gas, octane... 31 for the pilot jet and an 81 main jet. When I took it apart earlier today,I cleaned it all just to make sure, and no residue on anything, it felt like it wasn't getting fuel when it was chugging along on Monday,but it's getting fuel... That star con enzyme treatment is great , I like it better then sea foam . Your cdi may be bad and not firing correctly . That could account for the clunking noise as it Boggs down . |
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Post by necromagrimm on Nov 10, 2014 21:04:56 GMT -5
The plug has a nice whiteish,peanut color on the ceramic. I'll check for air leaks, ie. remove, check and retorque the intake manifold, and the airbox and connection to the carb. Should I mess with the needle in the carb? It's on the center indent out of the 5 of them. Thank you so much for the advice, I really do appreciate the help. Be back soon  |
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Post by necromagrimm on Nov 10, 2014 21:32:26 GMT -5
Can you tell me how to post a vid from my iPhone?  |
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Post by geh3333 on Nov 10, 2014 21:44:08 GMT -5
Can you tell me how to post a vid from my iPhone? I have a youtube account , I rec a vid from my iphone and upload it to youtube , then I copy and paste the address . |
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Post by geh3333 on Nov 10, 2014 21:46:08 GMT -5
It's not gonna be a needle problem . If it was running fine then all of a sudden the problem occurred , I'd expect a vacuum leak or an eclectrical issue " cdi " . That is with these symptoms .
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Post by necromagrimm on Nov 10, 2014 22:02:26 GMT -5
It'll be a video of it idling, and what it does when you roll the throttle...
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..BAD TO THE BONE..
octane... 31 for the pilot jet and an 81 main jet. When I took it apart earlier today,I cleaned it all just to make sure, and no residue on anything, it felt like it wasn't getting fuel when it was chugging along on Monday,but it's getting fuel...