Long story short i was riding along on a nice sunny day (this past Tuesday) and she lost throttle a little bit and died. I coasted in to a wall mart parking lot and commenced to try to start it up. After trying for about 30 min it started and I limped home with it not running good at all. It died twice on the way home. It was almost like it ran out of gas. Well today I put new fuel and vacuum lines on it, Changed the coil, Changed the fuel pump, Cleaned the air filter, And adjusted the valves to .005 intake, .007 exhaust. She fires right up and idles perfectly for 30 min or so then just stops. Ive adjusted the air,fuel screws n the carb. This bike has ran beautifully for 6000 plus miles. I don't know what else to do. I am stumped. I also put another intake and fuel filter on it. Any ideas folks. I sure would appreciate it. . Thanks
P.S
The fuel filter at times appears to be empty. This happens with the gas cap both on and off.
Last Edit: Apr 2, 2015 20:14:59 GMT -6 by bones113
Similar to my recent Roketa problem, except symptom #1 was, would start, but quit as soon as any accelerator applied. Took a new carb to fix it, as local shop declined to tear down the carb and diagnose the problem any further. Anyhow, in your shoes I think I'd be looking at the carb innards, or having someone do so.
Similar to my recent Roketa problem, except symptom #1 was, would start, but quit as soon as any accelerator applied. Took a new carb to fix it, as local shop declined to tear down the carb and diagnose the problem any further. Anyhow, in your shoes I think I'd be looking at the carb innards, or having someone do so.
Yes I have considered that. I believe I will probably have to get one or tear this one down and clean it. What a bummer.
If you can GET AT the darn thing, taking it all apart and cleaning everything, while checking for blockages and tears in the rubber parts, is really not all that bad. I did it, reluctantly, on my Magnum trike, where it could be easily removed, but opted to pay the piper for my Roketa, where a whole bunch of plastic had to come off. And I'm anything but a super-mechanic. BTW, a new carb cost me $80, and I saw it in another site cheaper but wasn't entirely confident it was an absolutely accurate replacement.
I fired it up today and it idled perfectly for 30 min or so then just went dead. While it was idling i payed close attention to the fuel filter. The filter filled up at first then slowly emptied as the motor ran until there was no gas evident in the filter. Shortly afterward it went dead. I dont understand that because I changed the fuel pump. I don't understand that one at all.
Is this a electric fuel pump or vacuum one? If it's vacuum you may very well have a vacuum leak and as the engine runs the pump slowly loses vacuum at a idle or lower speeds and can't supply enough fuel? Also is the fuel tank vented? If you're not sure take the cap off and then let it idle for a spell and see what happens? Also .007 is a little much on the exhaust valve, I never go over .006?
Is this a electric fuel pump or vacuum one? If it's vacuum you may very well have a vacuum leak and as the engine runs the pump slowly loses vacuum at a idle or lower speeds and can't supply enough fuel? Also is the fuel tank vented? If you're not sure take the cap off and then let it idle for a spell and see what happens? Also .007 is a little much on the exhaust valve, I never go over .006?
JR
It is a vacuum pump. I readjust the exhaust to .006 while I have it apart. I considered a vacuum leak but doggone if I could find one. All new lines, intake etc. i will figure it out. This scoot has ran to damn good for a long time. It has to be something small. It usually is.
It's possible with the exhaust at .007 you're not holding a good vacuum after the engine warms up, it's also possible you bought a poor vacuum pump, it happens. Fire her up and very carefully squirt a little carb cleaner around the intake manifold and carb area while she is idling to see if the engine revs up a bit, if it does then vacuum leak it is.
This sounds like the vent for your fuel tank is plugged. There has to be a way for air to get in the tank, to replace the gas that is being removed. No air in....and it doesn't take long til there's no gas out....new fuel pump or not.
I considered a possible venting problem but it does it with the cap on or off. I have the key lockable cap which is supposed to self vent. There is a hole on the side of the neck of the cap. I will attempt to run a peice of wire in there to see if it might be blocked.
