Freshman Rider
Currently Offline
2008 Magnum 50RL
Posts: 56
Likes: 0
Joined: Mar 2, 2013 19:15:44 GMT -5
|
Post by alecono on Mar 6, 2013 0:36:21 GMT -5
I have recently completed a complete redo on my 49cc Chinese scooter. I did the upgrades listed in my signature and for some reason my scoot is only pulling around 40-45 mph which is less than it did stock. I can feel the scoot bogging at WOT and it feels like it wants to pull more RPMs and speed but then will jolt back. as if I'm on and off the throttle even though its at steady WOT. I have tried tuning the carb with idle screw and A/F screw, however even upon A/F screw being all the way in, the bike stays running and at a steady idle. I have the stock carb and carb jet installed right now which i believe is an  (not labeled). too much fuel? too much air? what to do next?  |
|
|
|
Post by millsc on Mar 6, 2013 0:42:08 GMT -5
stock carb stock jet is most likely your problem, stock carbs usually come with a smaller jet than an , my roketa had an jet in it but the carb probably wasn't stock i bought it used. put a  -  jet in it and if it runs with the a/f screw all the way in your pilot jet is too big. 5 gram weights may be too light also after the bbk. |
|
Freshman Rider
Currently Offline
2008 Magnum 50RL
Posts: 56
Likes: 0
Joined: Mar 2, 2013 19:15:44 GMT -5
|
Post by alecono on Mar 6, 2013 0:52:11 GMT -5
I need to update that because i have 7gram rollers in there right now, Also I had a jet in there and it still ran with the a/f screw all the way in, the pilot jet is stock as well no clue what size though because not labeled and isn't WOT based on the main jet? |
|
|
|
Post by millsc on Mar 6, 2013 0:57:21 GMT -5
If it runs with a/f screw all the way in the idle jet is too big, won't effect wot, seems like you have a carb tuning and cvt tuning issue, it needs tuned to optimal running values.
|
|
Freshman Rider
Currently Offline
2008 Magnum 50RL
Posts: 56
Likes: 0
Joined: Mar 2, 2013 19:15:44 GMT -5
|
Post by alecono on Mar 6, 2013 1:02:29 GMT -5
So do you have any suggestions about jet sizes for both main and idle? also what do you suggest i do to my cvt
|
|
|
|
Post by millsc on Mar 6, 2013 1:36:49 GMT -5
I suggest jets - probably a 92 since you have the performance exhaust, idle jet 32-35 what you have is too big if it runs with the a/f screw all the way in unless you have the idle screw set way high. Get jets here www.power-barn.com/servlet/the-1539/Keihin-99101-dsh-116-dsh-XXX-Main-Jet/Detail they have all the sizes and these fit your carb. It seems like a tuning issue once you get it dialed in it will run like a champ. |
|
|
|
Post by justbuggin2 on Mar 6, 2013 4:38:21 GMT -5
i dont know carbs that well so i went EFI but Alley will see this soon and he is a carb guru
|
|
New Rider
Currently Offline
Posts: 38
Likes: 0
Joined: Mar 4, 2013 3:38:11 GMT -5
|
Post by Moat on Mar 6, 2013 5:06:49 GMT -5
I'd look closely for an intake leak - things like; bad or missing intake gasket/seal - cracked/split intake manifold - loose, split or missing vacuum hose(s). And yes - bigger main jet - considering the BBK/air filter/exhaust mods you've done.
|
|
Freshman Rider
Currently Offline
2008 Magnum 50RL
Posts: 56
Likes: 0
Joined: Mar 2, 2013 19:15:44 GMT -5
|
Post by alecono on Mar 6, 2013 10:24:11 GMT -5
I have checked everything, i have a high flow intake so theres not a whole lot of hosing just the filter and like 2 an inch between the carb intake. i just had the entire bore and everything apart to do a bbk and i have checked all seals and gaskets and its air tight. when i had the jet in it seemed to do the seemed to do the same thing at WOT |
|
|
|
Post by millsc on Mar 6, 2013 11:47:50 GMT -5
Did you plug the extra hose from the manifold and block the egr port if you have one, most do and it will cause an air leak
|
|
Freshman Rider
Currently Offline
2008 Magnum 50RL
Posts: 56
Likes: 0
Joined: Mar 2, 2013 19:15:44 GMT -5
|
Post by alecono on Mar 6, 2013 13:07:26 GMT -5
I put a breather filter on the manifold hose that also came from air box. I have no egr port
On top of this, my kill switch doesn't kill engine and doesn't need to be in the on position to start the engine
|
|
(not labeled). too much fuel? too much air? what to do next? 
main jet
- 
jet in it and if it runs with the a/f screw all the way in your pilot jet is too big. 5 gram weights may be too light also after the bbk.
