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Post by odinxxix on May 14, 2010 17:23:57 GMT -5
hello all new to the forum not scooters, but to this 4 stroke scooter yes. i have a roketa MC-02-50B that belongs to a friend of mine. it has some issues. ok first i replaced the belt,put in 6 g rollers,cleaned the carb and reset the valves. problem is when trying to ride it has this surge. starts off ok but when trying to give it WOT it doesnt really bog but more like all power goes away then comes on then goes away then comes on again. does this on the stand and on the road. what could be causing this? thanks for having me here.
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Post by stepthrutuner on May 14, 2010 18:01:27 GMT -5
Is the accelerator pump circuit doing it's squirt thing?
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Post by Fox on May 14, 2010 18:18:28 GMT -5
Cracked intake elbow?
Improperly installed Carb Diaphragm?
Cracked Carb Diaphragm?
Bad spark plug wire/boot?
Loose spade connector on the coil?
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Post by Goosey on May 14, 2010 20:47:53 GMT -5
When you cleaned the carb and put it back maybe the intake wasn't connected properly?
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Post by odinxxix on May 15, 2010 10:31:07 GMT -5
squirty thing? what are you talking about here? not sure how to check plug wire. coil connectors are tight and not broke. i never messed with the diaphram area. elbow looks good and i gave it an extra twist to make sure its tight. could a clogged fuel filter cause this condition? and what is that canister looking thing with all the vacuum lines on it. looks like it could be some sort of fuel tank vent. it has a line to the tank, and to a few other spots. like i said im new to the 4 stroke scoots. i actually own 2 honda and a suzuki all 2 T
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Post by 90GTVert on May 15, 2010 11:28:33 GMT -5
 Lever (1) should push rod (2) and fuel should squirt from 3. Here's the accelerator pump doing it's squirty thing. Very easy to check, as shown... Make sure the plug wire shows no signs of being burnt or damaged and that it is securely attached to the coil. The diaphragm is just under the cap on top of the carb. If the scooter sits for a long time it could dry and crack. If you do mess with it, there is a little tab on one corner that must be lined up with a reciever groove in the carb body. Pay close attention to that or you'll have more trouble. A clogged fuel filter should show symptoms other than just hesitation, but it would be worth changing since it's cheap and soemthing that needs to be done on a regular basis anyway. You should be able to pull the fuel line off of the carb and see fuel squirting out when the engine is kicked over. You've gotta be getting some or it wouldn;t run, but if it looks like barely anything comes out I'd check the filter and lines for sure. The canister you describe sounds like a carbon canister. It's emissions equipment that reduces hydrocarbons. |
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Post by odinxxix on May 15, 2010 11:54:02 GMT -5
ok ill check for the squirty thing. and a question for the needle in the diaphram. where should the clip be located? it has 3 groove settings and this is in the bottom. shouldnt it be in the middle groove. o and i pulled the fuel line that goes to the carb from the tank(with the filter still attached) and fuel just poured out so it good.
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Post by odinxxix on May 15, 2010 12:01:18 GMT -5
i just checked to see if it does the squirty thing and it deos. coil wire looks good. but now i wonder if the cable is out of adjustment? the 2 nuts that hold it in place are all the way back.(against the metal tube that the cable goes thru) what should it look like plus what setting is the needle suppose to be in. which of the 3 grooves should it be in? this one is in the bottom.
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Post by 90GTVert on May 15, 2010 12:13:59 GMT -5
The top position will make the needle sink lower and decrease fuel flow, the bottom position holds the needle higher to increase fuel flow. You can try changing it to see if you get any improvement. If not, put it back where it was.
The cable should be adjusted so there is very little slack. Some cables are made a little different, so there's no exact setting. Just make sure the cable isn't pulling on the throttle enough to raise the idle and it shouldn't be really sloppy either. The cable should be able to open the throttle all the way.
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Post by odinxxix on May 15, 2010 17:06:29 GMT -5
cable is in order, i adjusted the idle,and adjusted the a/f screw just tring things i even took out the air filter cause i thought it might be starving for air and nothing no improvement. this thing has really got me stumped. o and i put the needle in the middle, still nothing so ill put it back in the lowest position where it was. if you have anymore suggestions plz let me know
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Post by 90GTVert on May 16, 2010 13:02:25 GMT -5
How does the spark plug look (rich/lean)? What size is the main jet?
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Post by odinxxix on May 16, 2010 19:43:58 GMT -5
not sure the jet size ill have to take carb off again. i assume that it is stock. and the plug suggest a little rich but not real bad its a little dark but not wet.
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Post by odinxxix on May 17, 2010 20:44:11 GMT -5
would bad gas cause this problem? he told me today that the gas in it was about 8 months old.
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Post by Goosey on May 17, 2010 20:50:35 GMT -5
It could. Try draining it out and replace with fresh gas. Can't hurt  |
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Post by Fox on May 17, 2010 21:39:29 GMT -5
would bad gas cause this problem? he told me today that the gas in it was about 8 months old. The gas is bad for sure. Get rid of it. You can use it to clean parts or kill weeds. ;D |
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