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Post by kavid2013 on Apr 30, 2013 16:28:30 GMT -5
i have a chinese 50cc and have put 80 cc bbk on it aka 100cc on ebay.
and break in is over and top speed is only 40 mi/h.
everything else is stock.
what else can i do to increase my top speed?
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Post by millsc on Apr 30, 2013 16:33:12 GMT -5
you'll need a free flow filter and free flow exhaust so it can breathe, the scoots i put 50mm kits or bigger ran slow with the airbox, The muffler isn't a must the roketa i traded had a stock muffler and ran pretty good,but the filter seems needed
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Post by millsc on Apr 30, 2013 16:40:12 GMT -5
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Post by prodigit on Apr 30, 2013 17:14:51 GMT -5
most of the time a gearing change could do the trick.
some people would swear by getting a performance variator; but you'd have to make sure you get the right belt with that.
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Post by millsc on Apr 30, 2013 17:23:35 GMT -5
Belt size doesn't change with a performance variator gear change will give you top end if you have the power to pull the taller gear the weights must be tuned for the best performance, you can put all the upgrades under the sun on a scoot but if its jets, airflow and weights arent optimal it will be subpar and slow
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Post by prodigit on Apr 30, 2013 19:44:52 GMT -5
I've heard that with some performance variators, the belt goes more outward, requiring one to buy a belt that's a size longer, so it won't be pulled apart by the largest gearing of the variator, and limited by the rear pulley.. Don't know how much of that is true.
My stock 50cc can pull my scoot to almost 50MPH, and past that with some wind in the back.
I suspect if he installs a BBK, that the engine has more power, and that the gearing should be changed, unless if he's in a hilly terrain.
My 50cc can haul my 170LBS up a hill @30mph.
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Post by scootnwinn on Apr 30, 2013 22:21:43 GMT -5
Nobody ever says this and I don't know why but if you want to go faster you have to increase the power to weight ratio. There are 2 ways to do this. You can increase the power, which means buy stuff. Or you can reduce the weight of the bike and rider. That of course is free. Additionally the aerodynamics can be streamlined which also costs money but, windshields are cheap and easy to install. Race teams spend as much R&D money on weight reduction as they do on power increases, some more...
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Post by skuttadawg on May 1, 2013 0:35:59 GMT -5
A BBK will have more power but nessasy make it faster . I had a secret 63cc and put on a 82cc BBK takeoff and uphill were much faster but I had the same top end but the engine did not have to work as hard . It is not screaming on top end then lighter roller weights may help . If it is screaming at top speed then heavier weights will work . Changing out the drive gears will help but too high will hurt going up hill
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Post by dadzilla on May 1, 2013 0:40:36 GMT -5
[replyingto=kavid2013]kavid2013[/replyingto]Is that a picture of your scoot because I have the same one...
You put on a kit and that's a good start but if you haven't yet, go get the NKG plug, a better air filter, exhaust and aftermarket coil. Yes you also need to rejet the carb. These will put you into the upper 40s.
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Post by skuttadawg on May 1, 2013 1:02:24 GMT -5
The carb should be replaced with one that is not sealed as some you can not even unscrew the bowl to clean or install larger jets Scrappy has parts and whole power kit packages too as well as an 80cc engine you could swap out which would beeasier and less risk than rebuilding which is easy to make a mistake www.scrappydogscooters.com/139QMB_50cc_Performance.html I would replace the belt too as some come with a generic one that is junk and will not hold up with a BBK . Bando and Gates are the brandds to get . I use and prefer Bando since they are made in Japan ibstead of China . Tires is another upgrade as many stock ones are not good and you would want decent or premium tires to be safe and ride better . Get them balanced as it will get rid of the bounce and shimmy since for some dumb reason they do not come balanced like cars do |
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Post by skuttadawg on May 1, 2013 1:09:20 GMT -5
Also most come with an unlimited RPM CDI anyways so many report no improvement with an aftermarket one . Some have advanced timing that helps some but makes starting harder for others
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Post by chihuahuas on May 1, 2013 3:39:33 GMT -5
Bolt a leaf blower on the back and let her rip!!!!!
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