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Post by docxen on Aug 28, 2014 16:23:48 GMT -5
I have a taotao roadrunner and it cranks fine in the morning but after work here when it's been hot it's having problems cranking. It is covered by a tarp but it's hot to the touch when i take off the tarp. I have to start it a few times and sometimes it will seem to backfire. Also the idle is very low a lot at about a .10-.20 thousanth of an rpm not even a full thousand. Gonna try finding a shady place tomorrow to see if it helps but any suggestions are appreciated.
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Post by scooterpimp on Aug 28, 2014 17:51:18 GMT -5
Definitely try a cooler parking spot. Hopefully it helps , at least your but wont get burnt on shaded seat!
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Post by docxen on Aug 28, 2014 18:03:06 GMT -5
Lol Scooterpimp my bum stays ok the cover keeps it from too hot the handles are just really hard plastic i have gloves so no prob.
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Post by docxen on Aug 28, 2014 18:03:32 GMT -5
and by hard plastic i mean they get hot
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Post by docxen on Aug 29, 2014 15:45:28 GMT -5
Update:
Parked scooter in the shade and no problems after work. Left in soon at bank for 15-20 mins and it took 3 trys to crank it which isn't bad also i wan on a hill cranking it. In and out of grocery store no probs cranking.
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Post by scooterpimp on Aug 29, 2014 16:27:12 GMT -5
Horay for ethenol in our fuel!  |
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Post by docxen on Aug 29, 2014 17:46:43 GMT -5
actually i have been using ethanol free gas
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Post by scooterpimp on Aug 30, 2014 9:38:27 GMT -5
Your lucky , its all ethanol in my neck of the woods. E-15.
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Post by docxen on Aug 30, 2014 16:06:10 GMT -5
did you try the ethonol free gas map? also try some small gas stations on the back roads that's where i get mine at.
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Post by Sitticuss on Aug 31, 2014 3:48:46 GMT -5
Does it crank worse or just not start as easy??
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Post by docxen on Aug 31, 2014 6:25:40 GMT -5
The day in the sun it took maybe 15 times to stay cranked and backfired at least once.
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Post by huflungdung on Aug 31, 2014 13:32:35 GMT -5
So, I think you mean that it cranks fine (starter motor turns engine normally) but has trouble starting when hot.
Sounds like vapor lock.
When I had an airplane, this would sometimes happen with the result that one needed to crank more to force liquid fuel through the carb. It was worse with auto fuel, which is more volatile than 100 "low lead" avgas. (Some piston engine aircraft are eligible for FAA approval to use auto fuel at lower cost)
The Piper I had located the fuel sediment bowl in a separate compartment to shield it from radiated engine heat.
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Post by docxen on Aug 31, 2014 13:36:33 GMT -5
cool didn't know you could use car fuel in an airplane
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Post by docxen on Aug 31, 2014 13:37:38 GMT -5
Ok so if it's vapor lock would opening the gas cap to let out the vapor help?
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Post by huflungdung on Aug 31, 2014 15:56:58 GMT -5
I don't think so. I'm not sure where it usually occurs, but I think - closer to or inside the carb. In an airplane with the auto fuel "supplemental type certificate" (FAA speak for the authorization document), some have issues with vapor lock, some don't. I recall flying right seat with a buddy to get a hamburger at a certain airport on a hot day, and the plane was left on the ramp (only reporters call it a tarmac) for about 20 minutes. When we then tried to start, lots of cranking but no start. He apparently knew the drill, and we went back to the restaurant for an hour, letting it cool. At that point, it started and was fine.
This may sound like a safety issue, but generally not because once the relatively cool fuel starts flowing, everything stays cool enough to prevent VL. And when flying, there is lots of air flowing through the cowling.
The more scary issue is with carburetor ice ... or losing a pie-shape piece out of an exhaust valve just after take off...
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