Hard start when warm  By  stellarfoxy (Read 1,902 times)

Ahh! I can get another tach, this scooter didn't come with most of it's parts, and what it did have was abused so I'm not surprised something else is messed up. I tuned it yesterday with the gauge sitting at 2000 rpm whatever that is in real life. I checked for vacuum leaks last night and everything is sealed up nicely. still need to look at the plug though to see what it's color has to reveal. I'm thinking, based on suggestion here, I may be too big on my jets? granted, they are ebay jets and apparently that may or may not be accurate, so I'm assuming it's just kinda feeling around in the dark until it runs correctly.

I will look at adjusting the float tonight if I have time, might drop down to a smaller pilot and/or main jet if the plug looks ok.

anything else I should check? and any recommendations on a smooth clutch/bell combo? or a place that sells legit Taiwanese-or-better carburetors?

To be honest , most of the carbs on ebay " though they are cheep " are actually pretty good. If it were me . I'd go with a 26mm carb with a 120 main and whatever pilot it comes with. Maybe even a 115 main. I do believe you are correct about the jetting. You are more then likely too high for your setup. In have a bigger head and a bbk , and I'm running a 125 main with a 32mm carb.

I bought a set of jets off eBay and I had a similar issue. One was marked smaller but was larger then the rest ,lol.

hello again! I finally got some time to mess with it again, dropped the main jet to the one labeled 115 and the idle to the smallest non-stock one. after going from the 130 to 125, it seemed to lose some torque. seemed even weaker with the 115 and the plug was white after riding. starting it after it was warm was still not possible, but cool-down was around 20 minutes instead of whatever it was before (longer). I think I may have the idle closer now, but the main should be larger than 115. I also doubt my jets are even remotely labeled correctly. that's ok I guess, as long as it runs well and doesn't cook itself.

I've lost more of this tank of gas draining the bowl than driving ):

also I adjusted the float lower and it wouldn't start at all. so... oops. I ended up setting the little metal tab almost flush to the surrounding plastic and it did just fine.

I'm also starting to wonder if my clutch is the problem with it shutting off after giving it gas, it's extremely grabby and I think it's momentarily stopping the engine on initial engagement once it gets any heat in it. either way it sounds like the whole rear end is falling off when I take off from a stop after about 10 minutes of riding.

I may have it in me to take everything off and remove the carb again tonight to put the bigger jet back in and check it out. still no progress on why it isn't cranking when hot.

that's where it is. it was a little low before I think, the tab was pointed upward.

yeah I didn't realize it until you were saying 130 was too big but my 125 was reading a little lean lol. thank you so much for the help, I was just hoping to narrow up the places I'm looking. you've all been incredibly helpful! I'll update if anything gets fixed!

I just ordered the best-looking Chinese knockoff carb I could find on ebay. with the current jets in the carb I have it's not turning white but still impossible to start right after driving it around. it's got something to do with the idle screw because even when it's cold if I raise the idle to run smooth it won't start once it's off. I need to mess with it more I suppose.