3-1/4 turns on A/F screw

[Rebel]

The other thing you can do is just leave the needle alone and put a bigger jet in. Thanks for jumping in here Kliff, it is always good to have a real authority offer advice.

[philr54]

Well, I could just replace the pilot jet but then I'll never know what raising the needle would do. I'm starting to enjoy tinkering with these Chinese scooters, like toys for big boys. If I make a mistake, it can probably be fixed and won't cost a fortune. If it wasn't my only transportation, I'd be having a blast.

Phil

[Rebel]

great, then play until you are tired of doing it. Like I posted before, get a second carb to use as the primary get it down the road carb or the one you want to play with, just leave one alone until you get the other one tuned. Or go with your idea about having two scooters and tune one of them.

[philr54]

New carb is on the way. I took another shot at removing the needle and the tab in the slide snapped off. So I can't move the needle for now but it still works so I'm no worse off than I was.

Phil

[philr54]

Update: Got the new carb (Sheng Wey) with a 105 main and a 35 pilot AND an adjustable needle. Now it's running decent at 2-1/2 turns on the A/F screw. I'll ride it a bit before I move the needle position (one change at a time).
Original pilot jet is a 32 while most of the info I found says a 35 is most common. Anyway, things are better and tomorrow we're having a heat wave (47 degrees) and I have the day off.
Thanks for all the help y'all
Phil

[philr54]

I'm finally getting around to an update. After a go-round with the Post Office (about 2 weeks) I got some jets to play with. First off, I weigh about 275 (2 chinese adults and 2-1/2 kids). My daily commute is 24 miles one way mostly at 45mph, a little at 35 and a little at WOT (55). With the original #32 pilot and #105 main, the scooter ran real lean and hot (285+). If you adjusted the carb when warm the scooter ran crappy when hot and vice versa.
With a #35 pilot and #105 main the scooter ran better, same symptoms as before but less severe and temp was about 275. During this period top speed was 48 and cruised at 44, excelleration from 10 - 25 was a little weak when warmed up and when running WOT backing off the throttle actually increased speed slightly.
Now with a #38 pilot and #112.5 main excelleration is smooth and quicker up to 48 and top speed is 53mph, temps running at 245 - 255. Performance is much more consistant from beginning to end of commute and the spark plug actually has a little color to it

Of course during this entire fiasco the average temp has increased 15-20 degrees which will have some effect on the lean condition. I figure by the time summer gets here, I'll be running a #35 pilot and #108 or 110 main.
Bottom line - I learned a little about carbs and jetting and my scooter is running good. Thanks again for the comments and encouragement.

Phil

P.S. all mph are gps not chinamiles

[gmoney]

Plug looks pretty good Phil, nice write up!

Gary

[Rebel]

Glad you got it going better, but are you happy with it now?

[Rocketdog]

Next time you have the bowl off the carb. try the #35-#112.5. The plug looks pretty good, if not a little rich. Probably from that #38 pilot jet. But it would be ok as is.

500 miles on this one it's about perfect. Sorry my camera is acting up.



It looks like this. Kinda tanish red.





RD

[philr54]

I think with my weight and the speed/distance I'm going that I'm working this scooter kinda hard so I'd rather have it a little rich.
When I started messing with this, I was riding in 20-30 degree weather and even the #38 seemed a little lean. At around 50 degrees it runs great but once it warms up, I'll probably go back to #35. I still have a #108, 110 and 112 main to try out.

Rebel, yeah I'm happy with it for now but i've been reading too many of Kliffs posts and looking at 59mm BBKs, A9 cams, Uni filters and gear ratios and such, so who knows. I may become a gearhead .

Thanks again for the help, Phil

[Rebel]

just get your head in the right gear then. also you might check out the article in the resource are about a A/F monitor to install, it might surprise you just how it reads.