|
|
Post by sailracer on Jul 20, 2013 15:40:44 GMT -5
I built a motor with a 50mm BBK, 47 mm head, A9 cam & 20mm carb.I opted to use the exhaust that came on the bike because it 's the 2 stroke type with the expansion chamber.(ill see if I can post a pic) What size jet should I start with? I put an  in and it's lousy performance. I also drilled more holes in the airbox for more airflow, I adjusted the fuel-air mix for max idle. If I can't improve this, I'm putting the original 50cc back in. It performed way better than the new 83cc  |
|
|
|
Post by sailracer on Jul 20, 2013 15:43:38 GMT -5
heres the pic mine is a yy50qt30 looks the same, but nicer mirrors Attachments:
|
|
|
|
Post by scoots on Jul 20, 2013 22:18:49 GMT -5
if its not a 2-stroke then its robbing power and just get a pod filter and open exhaust then u should be fine if anything air/fuel mix
|
|
|
|
Post by sailracer on Jul 21, 2013 3:08:19 GMT -5
if its not a 2-stroke then its robbing power and just get a pod filter and open exhaust then u should be fine if anything air/fuel mix Quite the contrary, Ask Leo (old chopperguy) and a couple of more on this forum who use them. One might think so, but It actuallu=y does help performance. It has something to do with helping to evacuate exhaust fumes from the cylinder.It actually performed better than any 4 stroke I've ever ridden, right from the factory ;D |
|
|
|
Post by scoots on Jul 21, 2013 8:36:26 GMT -5
hmm i goota try
thanks for that
|
|
Sophomore Rider
Currently Offline
Posts: 151
Likes: 1
Joined: Apr 30, 2013 0:25:52 GMT -5
|
Post by brandjur on Jul 21, 2013 11:04:49 GMT -5
Have you checked the plug, or is it at a point where you can't get it to WOT? Perhaps try a 92-  MJ. I have a 47mm with A9 cam, stock head. I use an MJ. |
|
in and it's lousy performance. I also drilled more holes in the airbox for more airflow, I adjusted the fuel-air mix for max idle. If I can't improve this, I'm putting the original 50cc back in. It performed way better than the new 83cc 
jet
