Post by Rocketdog on Aug 30, 2010 18:16:28 GMT -5
I haven't done much to my Drag Scooter ever since we were in Indy. One of my problems has been an intake manifold that is close to the same size as the stock intake port, but will accommodate a OKO D-Slide Carb. If you have ever looked for such a beast you'll know it doesn't exists. The stock 18mm CV Carb is totally inadequate for my setup. This is what I'm working with.
QMB139 72cc
Stock Head, ported a bit, matched intake and exhaust, better than the run of the mill valve springs
NCY Cam
12 hp Briggs muffler welded onto a stock pipe
Now a metal HiPo 150 intake will physically fit onto a stock 49cc head. But the size of the manifolds port is almost double that of the heads port. The OKO <PWK knock off> slides right on one of these manifolds. So I said WTF. Even though it doesn't match at all, lets try it.
The 21mm OKO comes with a 36 pilot and an 84 main. Close enough to what I had before. 35/88. I plug it all up and see what happens. To my amazement it fires right up.
And this is kick starting it, I don't have electric start. Ok, maybe I'm on to something here. I'm using the manifold insulator, so I decide to take a Dremel and open the manifold side up, as much as I can, at a 45 degree angle. I tried to match the huge manifold port as much as possible. I bolt it all up once again and take her up the driveway. Hey, this ain't too shabby. Much better than the 18mm CV. Acceleration off the line is a lot quicker.
After a bit of testing I've settled for the 36 pilot, 90 main, and the needle in the 4th position. 500 ft above Sea lvl, 65% humidity, 87 F. Gunna take her to a long stretch of road and see what she will do now. A lot quicker off the line than she was. I'm going to take a hand full of main jets and have a friend shoot me with his radar gun to figure the top end out.
The throttle response from the PWK is good. You just can't WACK it open from a dead idle. It will die. But since we all have centrifugal clutches, you don't have to worry about that. I would run this setup on the street, if I was running a 72-80cc, No worries.
The Setup
Here's a video headed up my drive.
RD
QMB139 72cc
Stock Head, ported a bit, matched intake and exhaust, better than the run of the mill valve springs
NCY Cam
12 hp Briggs muffler welded onto a stock pipe
Now a metal HiPo 150 intake will physically fit onto a stock 49cc head. But the size of the manifolds port is almost double that of the heads port. The OKO <PWK knock off> slides right on one of these manifolds. So I said WTF. Even though it doesn't match at all, lets try it.
The 21mm OKO comes with a 36 pilot and an 84 main. Close enough to what I had before. 35/88. I plug it all up and see what happens. To my amazement it fires right up.
And this is kick starting it, I don't have electric start. Ok, maybe I'm on to something here. I'm using the manifold insulator, so I decide to take a Dremel and open the manifold side up, as much as I can, at a 45 degree angle. I tried to match the huge manifold port as much as possible. I bolt it all up once again and take her up the driveway. Hey, this ain't too shabby. Much better than the 18mm CV. Acceleration off the line is a lot quicker.After a bit of testing I've settled for the 36 pilot, 90 main, and the needle in the 4th position. 500 ft above Sea lvl, 65% humidity, 87 F. Gunna take her to a long stretch of road and see what she will do now. A lot quicker off the line than she was. I'm going to take a hand full of main jets and have a friend shoot me with his radar gun to figure the top end out.
The throttle response from the PWK is good. You just can't WACK it open from a dead idle. It will die. But since we all have centrifugal clutches, you don't have to worry about that. I would run this setup on the street, if I was running a 72-80cc, No worries.
The Setup
Here's a video headed up my drive.
RD
CAN YOU HELP ME OUT MAN,AS i LOST ME JOB DUE TO NOT BEING ABLE TO GET THERE?ANY INF