Post by wheezy on Oct 25, 2013 17:24:47 GMT -6
So I pulled my generic 50cc out of the corner of the garage after almost two years in storage. The new battery I bought back then won't keep a charge. Sucks cause the bike has only about 400 miles.I have a couple other 12v batteries that have spade lugs rather than posts. So I at least can crank it.
At first, it wouldn't start. It had been out of gas, so I assumed maybe junk in the tank or water. Managed to eliminate both of those. Then thought fuel wasn't flowing (again maybe junk in the tank or petcock not getting vacuum), turns out the float bowl was full, so no flow. I took of the carb and cleaned everything. The diaphragm is in great shape. Figured it would be a good time to do my own PDI, since I bought it off Craigslist. The valves were close, but I set them both to about .004 inches. The vacuum and fuel lines are in decent condition. Replaced all the zip ties with new ones, and verified the wires are good and spark is sparking blue.
I got everything back together. Still no start at first. I remembered the float was full, but maybe not primed. So I put a spoonful of gas into the diaphragm cover, and it pretty much fired up with some coaxing. The A/F was way off, don't know how it got that way as it ran great back in GA. I adjusted that and the idle speed. The back idles now better than it ever did. Throttle response is instant.
Took it for a test ride and that's were my new problem arises. I live on a slight incline. Downhill and at low rpm's (less than 4k), the bike is fine. I turn around and go uphill, and it bogs heavy until I goose the throttle, then it's only good again for a couple more seconds before I have to goose it. Now, even uphill at 4k rpm, it runs well but I only get 10mph, well below the performance before it sat. Downhill again and it's fine through the whole throttle.
So at first I thought main jet, but I cleaned that. But here is where it gets real weird. Back on the stand, without the load from the rear tire, the throttle is great through at least 6k rpm. No bogging, no sputtering, nothing but great response.
I will be pulling off the clutch and variator to check and clean. But, other than that, anyone have any ideas as to what causes the bogging under load?
At first, it wouldn't start. It had been out of gas, so I assumed maybe junk in the tank or water. Managed to eliminate both of those. Then thought fuel wasn't flowing (again maybe junk in the tank or petcock not getting vacuum), turns out the float bowl was full, so no flow. I took of the carb and cleaned everything. The diaphragm is in great shape. Figured it would be a good time to do my own PDI, since I bought it off Craigslist. The valves were close, but I set them both to about .004 inches. The vacuum and fuel lines are in decent condition. Replaced all the zip ties with new ones, and verified the wires are good and spark is sparking blue.
I got everything back together. Still no start at first. I remembered the float was full, but maybe not primed. So I put a spoonful of gas into the diaphragm cover, and it pretty much fired up with some coaxing. The A/F was way off, don't know how it got that way as it ran great back in GA. I adjusted that and the idle speed. The back idles now better than it ever did. Throttle response is instant.
Took it for a test ride and that's were my new problem arises. I live on a slight incline. Downhill and at low rpm's (less than 4k), the bike is fine. I turn around and go uphill, and it bogs heavy until I goose the throttle, then it's only good again for a couple more seconds before I have to goose it. Now, even uphill at 4k rpm, it runs well but I only get 10mph, well below the performance before it sat. Downhill again and it's fine through the whole throttle.
So at first I thought main jet, but I cleaned that. But here is where it gets real weird. Back on the stand, without the load from the rear tire, the throttle is great through at least 6k rpm. No bogging, no sputtering, nothing but great response.
I will be pulling off the clutch and variator to check and clean. But, other than that, anyone have any ideas as to what causes the bogging under load?
..BAD TO THE BONE..
