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Post by cinnamon on Jun 1, 2013 18:59:07 GMT -5
So this is my third post about this scooter and I am so frustrated with the scooter I'm ready to push it into the Trinity and wave bye bye. Scooter is a Roketa 150cc MC-17-150 History - previous owner replaced carb because it wouldn't run. Ran until I bought it and rode it home. Since then the boyfriend and I have replaced the: fuel lines - old and weak the petcock - was leaking and then broke - first stall/death the spark plug - it was old and wet when pulled out - second stall the head lamp bulb adjusted the carb cause it was running rich - did this after the third, fourth, and fifth stall adjusted the throttle - with each carb adjustment adjusted the valves - top was REALLY loose and the bottom was tighter then .003 got them set at .005 and .004 tightened the grounding wire, and got the coil off the engine and mounted to the frame. After the valve adjustments she started and ran with a lot more power. Decided to try a long ride (about an hour). A mile from home she died once again. Could she be overheating? Could the coil (that had been resting on the engine and the wires kinda look melty) be overheating and causing her to stall?? Any ideas before I push her into the Trinity and wave??  |
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Post by tvnacman on Jun 1, 2013 19:59:48 GMT -5
recheck the valve adjustment , the heads on the engines are soft . The valves have to be checked often till they settle and hold adjustment .
John
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Post by cinnamon on Jun 1, 2013 20:37:33 GMT -5
[replyingto=cinnamon]cinnamon[/replyingto]Update: We let her cool in the Tom Thumb parking lot for a couple of hours and she started right up. She's home now thankfully. Attached is a pic of what the wires under the rubber part of the coil look like. Attachments:
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Post by cinnamon on Jun 3, 2013 12:21:10 GMT -5
So I ordered a new coil - they aren't expensive and since the old one rested on the engine for who knows how long I decided it wouldn't hurt to replace it. Better safe then more headaches.  Since I've been reading about coils and cdi's on the site I'm wondering if I shouldn't replace the CDI as well. I'm not sure if my current is a DC or AC CDI I'll have to wait until I take it all a part again once I have the coil. I'm also wondering if I shouldn't run the scooter until it dies again then check the valves to see if they are sticking. Not just let it idle for a while then check to make sure the valves are correct. *pondering* |
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Post by cinnamon on Jun 11, 2013 9:48:50 GMT -5
So I replaced the coil and am still having the same problems. Sitting on the side of the road waiting to be rescued I got into a conversation with a guy who has a liquid cooled 250cc. He says the air cooled 150cc just don't get enough air to keep the engine from over-heating and that's what is stalling her. *sigh* Up on Craig's List she goes. I will just have to save up to get a new, liquid cooled, scooter.
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Post by kingkaymo on Jun 11, 2013 9:56:08 GMT -5
that guy has no idea what hes talking about sweetie. why would they make and sell a scooter with a cooling fan that wasnt sufficent for the engine?
we need more info to diagnose. a long ride of an hour doesnt tell us how fast you were riding for how long. vacuum petcocks sometimes close at wide open throttle from lack of vacuum, causing fuel starvation that leads to running lean (and hot) but we dont know if thats your problem.... but i can tell you its not because "150's dont get enough air"
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Post by scootnwinn on Jun 11, 2013 11:55:08 GMT -5
Did you ever check the valves?? I agree that guy is misinformed. I rode an air-cooled Chinese 150 in the New Mexico summer and had no trouble with over heating. I rode my air-cooled 200 yesterday for 120 miles in the desert sun and no overheating. You are having a simple problem that is likely easily remedied. Start with the valves. They should be checked cold not warm. A liquid cooled scooter is a good move but you will get more for your current one in running condition. More info please
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Post by rockynv on Jun 11, 2013 12:14:35 GMT -5
It can be many things but after you have verified the valve adjustment and that the carbeurator is now not too lean you may have a problem with the ignition pickup. This is a fairly cheap part that is prone to cracking so that when it gets hot the cracks expand open and if fails. I went the carb, coil, cdi route with my previous bike a Lance Vintage 150 and the root cause was a hairline crack in the ignition pickup.
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