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Post by cshoemake1 on Feb 26, 2013 14:03:24 GMT -5
If there is anyone here who is a mechanic for roketas mc-79 250cc moped or anyone who has worked on them before I have an important question.
When my bike is still for a long period of time, an hour and greater, a small puddle of fuel builds up on the ground underneath. There is a hole in the plastic frame on bottom and there is also a small wire sticking out. I can;t see much inside as I can't fit my head underneath there.
The fuel doesn't seem to leak when I drive it, but when I let it sit overnight half of the tank is gone!
I need to know how to check where the fuel is coming from (the tank or a valve or a hose or whatnot) and I prefer not to take it to the mechanic.
This is a problem because I am a student and cannot afford to constantly waist 9 bucks on the tank every two days.
If there is anyone who can help me plz respond ASAP, I am not the only one who depends on driving this bike, me and my fiance both need to get to work and school
Thanks in advance!!!!
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Post by edfr on Feb 26, 2013 14:44:13 GMT -5
Since it empties your tank overnight I WOULD SUSPECT it is leaking by one of the FUEL HOSES either connected to the tank or the FUEL PUMP or the FUEL FILTER.
Lefty
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Post by cshoemake1 on Feb 26, 2013 15:33:46 GMT -5
How easy is it to check for either of those?
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Post by scootnwinn on Feb 26, 2013 15:36:25 GMT -5
It is very easy but you will have to expose the carb. If you can look in there the leak should be very obvious...
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Post by redhouse7 on Feb 26, 2013 15:45:36 GMT -5
The most probable cause is a sticking float, or dirty needle/seat in your carburetor. The float, floats up as the carb fills with gas pushing a small tapered needle into a matching seat which cuts off the flow of fuel into the carb. If the float sticks in the bottom position, or there is a small amount of dirt or deformation of the needle and seat gas will continue to flow. The extra gas has two places it can go, into the cylinder and eventually your crankcase, or it goes out the overflow and down the tube that runs from the card to the ground or in some cases to some part of the emissions system.
These carbs are relatively easy to work on if you have any mechanical aptitude at all. The hardest part is getting them off and back on. Be sure to order a carb kit for it before trying to clean it. This way you can just replace all of the potentially troublesome parts.
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Post by scootnwinn on Feb 26, 2013 15:55:34 GMT -5
Isn't the tank below the level of the carb and pumped to the carb? or is it gravity feed. Sticky float will only leak a little while, not all night if there is a pump. If it leaks all night my bet is with lefty's advice
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Post by edfr on Feb 26, 2013 15:59:55 GMT -5
That is correct, It could only happen if it is a gravity fed system and only if the PETCOCK was not shutting off and allowing fuel to flow with no VACUUM.
That can also be tested for, take the fuel hose off the carb put it in a container and crank the motor over, fuel should flow then stop cranking and the fuel should stop flowing.
That much gas going into the motor it would not start it would be locked up.
Lefty
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Post by novaraptor on Feb 28, 2013 12:16:31 GMT -5
I have the same scooter and my leaking problem was a crack in the bottom of the tank itself. I think that it was due to the vented gas cap not working properly and allowing pressure to cause it to flex and finally crack. The tank is available from roketa.com and is $50.00. It is labeled as an "oil tank" in the parts list. A generic 250cc scooter tank will NOT fit. One thing to note if you have to replace the tank: it's pretty easy to do, but it took me awhile to realize that the mounting rails for the footpad plastics unbolt, allowing the tank to be removed. Hope that helps..
Novaraptor
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