Wednesday, November 24, 2010

Scooter still not working. What else could be the problem?

Scooter died the other day, put in a new spark plug and fuel filter today, it's still not working. Took it for a test spin afterwards, didn't make it out of the neighborhood. Walked it back home a short ways, tried restarting it, pumping the throttle vigorously until the bike started again and made it back home.

What normally happens: It starts up good the first time but after a few minutes or so, the engine goes out. It just gives up and dies. This happens whether it is idling or in throttle. From start to stop: idle sounds like it is smooth and steady at first, then gaspy and barely holding on. During throttle, it sounds/moves good at first, but then the bike stops, refuses to move, then the engine gives up. I don't know how to explain it except that it reminds me of a gasping or choking sound.

I did change the oil a week and a half ago, a week later it started giving me this problem. The recommendation is 4-stroke 10w-30 motor oil. I couldn't find that (anywhere), so I put in 4-stroke 10w-40 motor oil. Also, it's recommended to use 90+ gas, I use 91 and non-flammable oil should be added to the air filter, but I can't find any so I haven't done that yet, but last I checked the filter looked fine. Fuel filter didn't look too bad, a tiny speck of gunk but nothing major, still wanted to upgrade it from the factory part though. I don't think (or really know) that these are the issue or not, but I figured I'd add it in just in case.

The spark plug when pulled today did have a bunch of gunk buildup around it though. It also had a burn mark line running along the casing that I think was caused by the edge line of the distrubitor cap and the very top tip of the plug that connects inside of the distributor cap, looked slightly warped and burned off.

I'm taking it into the shop tomorrow to get it looked at, I called and told them that I want the carb looked at (forgot to mention the spark plug issues). Since the bike is only 3 months old, has new oil, new sparkplug and new fuel filter, and the gas is of the right octane; the last thing that I can think of is clogged jets in the carb.

With all of this: What do think is the problem?Scooter still not working. What else could be the problem?
Sounds like it could one of 2 things. The breather for the fuel tank is blocked so the bike will run ok for a while until the vacuum created inside the fuel tank becomes so great that not enough fuel will come out and the engine will stall. Not sure what you mean by distributor cap (scooters don't have them) It could be that the spark plug cap is breaking down when it gets hot and the HV spark is tracking down the outside of the spark plug, instead of going across the electrodes as it should.

I doubt that it is the jets blocked. The bike would run like crap right from initial starting.Scooter still not working. What else could be the problem?
Not sure what scooter you have here but some scoots have a charcoal filter for fuel overflows and this can cause an issue.

Let the dealer do their job and provide them with as much information as you can.

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