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09-25-2013, 05:38 PM | #2 |
Join Date: Sep 2011
Location: staunton va
Posts: 319
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no bbk is the best bang for the buck, you get speed and power from what i know.my scooter with 70 bbk has and can beat most 150s and the 96cc dogs them wont even compare a stock scooter against it. I f your light enough a stock scooter 2t will do 45 ish but a good bbk when setup right will be 50-55 range and have double the power through out the rpm range
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2010 Cpi Oliver 70cc, naruku trans kit, downhill handle bars, tecnigas rsll pipe, s6 4g rollers, Vento R4 with 90cc 1e52qmf technigas next r 100cc pipe Naruku, 21mm race carb, s6 4.5 g rollers |
09-25-2013, 06:44 PM | #3 | |
Join Date: Apr 2006
Location: South Haven Michigan
Posts: 225
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09-25-2013, 07:53 PM | #4 |
Join Date: Sep 2012
Location: West Haven CT
Posts: 1,165
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Hi
Heres a 2t scoot with a 77 cc bbk Theres no replacement for displacement Take care and ride safely Yours Hank
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"4wheels move the body 2 wheels move the soul" Duty, Honor, Country. Those three hallowed words reverently dictate what you ought to be, what you can be, what you will be. Douglas MacArthur |
09-28-2013, 12:13 AM | #5 |
Join Date: Jul 2011
Posts: 127
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Yeah 7mm does not sound like much but it was a huge improvement for my 2T when I put on a BBK and pipe . Actually take was less since the new pipe is unrestricted but midrange I can ride a wheelie while going down the rode with 13 wheels instead of 10s like many have and top end goes beyond the 50MPH mark on the speedo and I dont have a GPS to verify . There was a radar that displayed speed and at 20 , 30 and 40 it said my speedo was 4MPH higher than what the radar said all three tests . The BBK also has a larger exhaust port that is fully bored where the 49cc is shaped like a D instead of an O . Stock engine and pipe it would max at 8,000 RPMs and fizzle if I went past that going downhill . With BBK and PM Racing pipe it can hit 10,500 and even 9k while going up a large and steep hill with a running start .
I would try a larger main jet and maybe lighter or heavier rollers and enjoy the stock engine and get a BBK later . Stock I could hit 45 to 50 all day long . With the BBK I have outran two 150s and walk off and leave all other 50 to 80 4T scooters I raced . Most use 4g or 5g rollers . Mine came with 6g . I tried 4g and they were too light as it sounded like it over revved on takeoff and had a top end loss . Put on a blue finned CDI from PFS and had the same top end but a hair more pep on the bottom and midrange . I mixed up 3 6g and 3 4g to equal 5g and I liked how it ran . I now have 8g sliders to try and cut down the RPMs while on the highway as it drinks way more gas than when it was stock . Takeoff is slower but I love to see the looks on peoples faces when I pass then on my lil screamer . I would get an iron cylinder since they are cheaper and more forgiving in a soft seize . I have this BBK http://shop.jupiterscooters.net/Cyli...CC-10mmpin.htm it only had a 75MJ which I used on the 50 but it did have a 45 idle jet that was an improvement over the 40IJ with a BBK . I had bought one and it did not have the jets and dang it a wristpin came out and ate up the engine . The second kit had the jets and I tugged on the wristpins before sliding the cylinder down on the 2nd one . You need to measure your wristpins as some use 10mm and others 12mm |
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