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Thanks Cruiser, that's exactly how I programmed the Sigma. I just entered the four numbers and that was it. I heard a lot of good things about Sigma and that's why I went with it. As for the pilot jet, I am not sure what size it is. I purchased it from partsforscooters and I assume it's the stock version. I'm still learning about scooters and still don't know how you determine the jet size you have?

I had trouble starting my Peace 50cc for almost two weeks, but after replacing the pilot jet I'm back on the road!





I added a reliable Sigma Speedometer.

Thanks to all, I solved the problem!!! Turns out it was the pilot jet!!! When I ordered the intake manifold, spacer, and gaskets, I failed to mention that I ordered a new pilot jet which arrived yesterday. After installing the intake manifold and spacers it still didn't work. I really wanted to give up. So when the pilot jet came yesterday I didn't think that would work either, but I took the carburetor out once again and compared the old pilot to the new pilot holding it up to the light. I saw more light coming through the hole on the new pilot jet than the old jet so I was hopeful. I installed it and it fired up after a few tries. I warmed it up and adjusted the air/fuel mixture and idle then took it for a spin and it runs great. I assume something is stuck in the old pilot jet that just wouldn't come out with carb cleaner no matter how many times I've tried. Thanks to all for helping because I've now learned a lot more about troubleshooting!!!

Well I received the new intake manifold, spacer, and gasket for the scoot and installed all of them today. The same thing happens, just starts and then dies! There is plenty of gas in the carb because I took it out again. I'm now gonna turn the fuel ratio screw out 3 turns as suggested by alleyoop and see what happens. This is frustrating being the bike only has 91 miles on it!

Ok, so I disconnected the vacuum line from the intake manifold and squirted some gas in, reconnected the line back and I got it running!!!! I was happy to even hear it going on for about 10 seconds. So I did it again and it ran. So this narrows down my problem, now what's next to check? I'm on a roll so lets not stop now!!!

I didn't have a syringe, but I have a hand held vacuum pump. I used it on the vacuum line to the petcock and put the fuel line in a container and gas came out. I'm going downstairs to squirt some gas into the intake manifold and see what happens.

I believe I found the problem. I decided to look again at the possible vacuum issues, and I took the intake manifold off again and saw that the black plastic gasket under it has a slight crack on it. I will order a new one, but I'm hoping that this was it. It could have happened when I last put the manifold back on because I didn't look at it before. Can a slight crack in it still cause a bike not to start?