Chinese Scooter Club

ryan27ish · Mon Jul 14, 2008 3:13 pm baotion

hey, I got a baotion scout 49 cc, I did the deristiction guide, I have now brought a bigger jet from adrenaline and lighter rollers 4.5, it has made the bike slower, with new rollers in or out :( it revs hard then once it gets to about 30 its as if no I dotn want to go any further, can anyone surgest anything. so far it has the pink wire cut,90 jet the screw out fo top of carb, cheers ryan

Yellow Scooter · Mon Jul 14, 2008 3:24 pm

That 90 jet is way too big. :shock:
You needed a 79 or an 80 at the most with everything else stock. A 90 is for big bore 80cc and the like, fully opened up with a K&N a straight-flo exhaust, etc. Basicly a full on engine buildup.

DaveS · Mon Jul 14, 2008 3:34 pm Re: baotion

ryan27ish wrote: hey, I got a baotion scout 49 cc, I did the deristiction guide, I have now brought a bigger jet from adrenaline and lighter rollers 4.5, it has made the bike slower, with new rollers in or out :( it revs hard then once it gets to about 30 its as if no I dotn want to go any further, can anyone surgest anything. so far it has the pink wire cut,90 jet the screw out fo top of carb, cheers ryan

What you describe sounds like an extremely over rich mixture in the upper throttle range. What did you do to increase the air flow to go along with that #90 jet?????? #80 or #82 would be plenty big for the standard air filter from my experience with my own 139QMB machine. Any bigger than that and power actually starts decreasing at higher throttle positions with the stock air filter. I only went as high as #86 in my own experiments, and it was bad, so I can only imagine what it is doing gargling so much gas with a #90 jet and a stock air filter. As an experiment, if you are still using the stock air filter with that #90 jet, is to totally remove the air filter *complete* system and try a short test run with a warm engine. If it gets better, then your main jet is too big. I am guessing that it will get better, but not as good as it could be, because #90 is pretty big for that engine.

thruss91 · Tue Jul 15, 2008 4:21 pm

crikey, read up on it more before you touch the carb! you dont wanna mess with it unless you know what youre doing, put an 80 jet in and leave the airbox on, if you put a freeflow filter on you will have no end of problems including break downs. take the small plastic restrictor pipe off the inside of the airbox and use it with the 80. then leave it and dont touch it again unless you have problems. every time you take the bike apart, the weaker it gets.

ryan27ish · Thu Jul 17, 2008 1:13 pm

o s**t, I swear on the topic I was told before to put a 90 in there, ok I will try taken the hole air box off on a warm run, and I will buy a lower jet, thanks for the help guys, I could of sworn someone said a 90,
I have taken that little pipe out of the air box to make up for it, I will go do the air box thing now and get back to you cheers

Yellow Scooter · Thu Jul 17, 2008 3:31 pm

That might make it run a little bit better, but it's still gonna be rich as hell. Kinda like puttin out a cigarette with a firefighters hose.
At the same time you order your smaller jet, order you a new spark plug. If the plug isn't fouled already, it will be if your running the bike with that jet in it still.

ryan27ish · Thu Jul 17, 2008 4:34 pm

ok I have ordered a 80, I will go get a spark plug once jets in, I could of sworn someone on here said to get a 90 lol, o well, two quick questions
the head of the piston, should it be smooth or have tiny dentations, and is there a decent spark plug that adrenaline pedstop sell??? for the bike
thanks for all your help

thruss91 · Thu Jul 17, 2008 6:48 pm

please, please dont tell me you took the head off. it supposed to have the rough cast on because it doesnt make a difference weather it's machined or not. if you put it back together, have you got any leaks? trust me, you dont want to take apart these bikes any more than you have to because of teh cheap materials. good to see youve taken everyones advice on keeping the original airbox without the restriction and 80 jet. hopefully you wont have to take it apart again :wink:

ryan27ish · Thu Jul 17, 2008 7:06 pm

I was trying to take advice last time lol, yes the hole engine was strippied and re built by me, I did it at work (trainee mechainc) the crankshaft bearings went at about 3,000 km/h, lol, I have finished runnign it in, and now putting performance parts back in, does adrenaline do a spark plug for ym bike if so which is the best cheers

ryan27ish · Thu Jul 17, 2008 7:08 pm

o and also where int he exhaust is the restrictor placed? is it at the tip where it joins engine or further down to make it harder for us lol?

Stanislavs1 · Thu Jul 17, 2008 7:17 pm

I had #90 Jet and 4.5 grams on my Qingqi. Ran awesome. Make sure you have a freeflow filter though.

ryan27ish · Sat Jul 19, 2008 11:15 am

ok so I now have a 82# int he bike, air box pipe restrriction off, it revs then as soon as it gets high it liturly stops reving and dies, well not even high 10 mph, I'm guessing the air to petrol is still VERY out :s someone help please

DaveS · Sat Jul 19, 2008 11:37 am

ryan27ish wrote: ok so I now have a 82# int he bike, air box pipe restrriction off, it revs then as soon as it gets high it liturly stops reving and dies, well not even high 10 mph, I'm guessing the air to petrol is still VERY out :s someone help please

Sounds like something in your {main jet - needle - diaphragm slide} setup may be messed up. I once had the clip fall off the main jet needle, due to faulty workmanship on my part, and it acted almost as bad as that. If the slide is not rising at all, due to a torn diaphragm or something, that may also have an an effect something like that. I have run for quite a while with a #82 main jet and cleaned up stock air box, and it runs fine that way just a little on the rich side.

ryan27ish · Sat Jul 19, 2008 11:39 am

was you runnign ti with the filter in yes?, I may take it apart and see if I have damaged the float or summing maybe when I put it back together

DaveS · Sat Jul 19, 2008 11:49 am

ryan27ish wrote: was you runnign ti with the filter in yes?, I may take it apart and see if I have damaged the float or summing maybe when I put it back together

Stock filter, just cleaned up a bit with most obvious restrictions removed or reduced. It's not so likely to be your float because that would also be likely to affect your idle too since the float bowl feeds all jets. The black slide in the center of the carburetor comes into effect after you increase speed.