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Post by blueboy5000 on Jun 21, 2012 8:18:25 GMT -6
So I just stumbled onto this Ruckus clone with 12" wheels which has a 72cc bbk. Got it for a steal because the Unifilter disintergated and sucked chunks of black plastic and sludge through the carb. The carb, while upjetted, has a slugged AF screw (no af screw).
Took apart the crappy carb and found a #88 jet.
Rather than waste time, I ordered a new 139 carb and a #88 jet.
I'm not certain is a #88 jet is optimal jet.
Thoughts?
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Post by blueboy5000 on Jun 21, 2012 8:20:01 GMT -6
Also ordered a new filter (uni style)
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Post by alleyoop on Jun 21, 2012 11:02:47 GMT -6
With the BBK , an 88 might just do it. If not you will be close all motors are different. And good that you ordered a new carb with the Fuel Ratio screw available and bowl screws not cut off. You will be better off being able to fine tune it.
Alleyoop
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Post by blueboy5000 on Jun 21, 2012 14:47:27 GMT -6
Okay good to know. I've never actually messed with the 72cc BBK on a 139. The guy I got it from claimed 75mph. I'm thinking 45 to 50mph.
Bike has 6g weights (which I found funny since I just put 6g on my wife's 139). Should I run heavier weights?
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Post by Bong on Jun 21, 2012 16:32:46 GMT -6
88 is actually the most common for that set up. A 90 is Ideal IMO..... depending on altitude/ weather and Exhaust....... Have ya checked the piston/rings?  ? Dirt is bad as you know. It maybe a good idea to check if the scoot ran without a decent air filter on. even little pieces of foam can cause scuffing and general havoc. Just a thought. I run an 88/90 jet depending on the season on a 63cc with a UNI and Exhaust |
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Post by blueboy5000 on Jun 22, 2012 5:10:03 GMT -6
When it was running it didn't smoke, or blow lots of oil from the crankcase vent. Compression checks out. Pretty sure the rings are fine.
None the less, while I wait for my new carb, she's getting a full PDI, including replacing all oils and full greasing. So far everything checks out.
I'm pretty psyched about this one. Can't wait to see how fast a 72cc is in relation to the 49cc.
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Post by blueboy5000 on Jul 1, 2012 6:12:06 GMT -6
Got my carb installed. What a snappy scoot! Climbs at 25 easy with a flat speed of 45-50 (48mph GPS).
This makes me contemplate 72cc BBK -ing the wife's Roketa. I had no idea you could make such a power difference with a simple BBK and a jet!
Next is 5.5 g rollers. I shall keep you posted!
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..BAD TO THE BONE..
