need Advise on making a 229cc motorcycle faster By racerx125 (Read 909 times)

[racerx125]

Well Currently it reaches 50-55 mph and no more on highway. I can only reach 5th gear which is my max gearshift and when im on max my rpms go no more than 8,000 rps max and eventually get passed easily by any car. Why can't I reach 60 Mph! How can I make it faster. I do have a little bi of RPM space before it reaches redline and yet it only reaches 8,000 rpm maximum!

[alleyoop]

Your out of gearing, if this is a Chain Drive you will need to get a smaller Sprocket on your rear wheel for more top end speed.
Alleyoop

[racerx125]

what do you mean by smaller? You mean I need something less than 46t sprocket? 

[scot]

WELL YOU COULDS SEE IF YOU BIKE HAS A BIG BORE KIT AVAILABLE ,AN GET MORE HP ,MABEY AN PIPE THAT BREATHS BETTER AN MY GUESS ON SPROCKET BEING SMALLER IF ITS SAY 7 INCH 46 TEETH MOVE AN GET A SMALLER ONE NOT AS WIDE ,HOW MANY TEETH I DONT KNOW ,BUT ALLEYOOP MAY KNOW ALOT MORE ,I KNOW THIS A BIGGER SPROKET GIVES LOW END POWER TO THE REAR WHEEL AN A SMALLER ONE GIVES MORE TOP END POWER WICH EYQUALS SPEED,AN GOING FASTER ,HOW MUCH TIME WILLTELL,BUT THE CHEAPER WAY IS THE SPORKET THEN THE CAN ,THAT SHOULD GET YOU 60MPH

[racerx125]

Dec 29, 2013 17:59:54 GMT -6 scot said:

WELL YOU COULDS SEE IF YOU BIKE HAS A BIG BORE KIT AVAILABLE ,AN GET MORE HP ,MABEY AN PIPE THAT BREATHS BETTER AN MY GUESS ON SPROCKET BEING SMALLER IF ITS SAY 7 INCH 46 TEETH MOVE AN GET A SMALLER ONE NOT AS WIDE ,HOW MANY TEETH I DONT KNOW ,BUT ALLEYOOP MAY KNOW ALOT MORE ,I KNOW THIS A BIGGER SPROKET GIVES LOW END POWER TO THE REAR WHEEL AN A SMALLER ONE GIVES MORE TOP END POWER WICH EYQUALS SPEED,AN GOING FASTER ,HOW MUCH TIME WILLTELL,BUT THE CHEAPER WAY IS THE SPORKET THEN THE CAN ,THAT SHOULD GET YOU 60MPH

well for the big bore kit I cant seem to find it, but as for the sprocket I will try and get some measurements as my sprocket is 46 tooth. 

Motorcycle is Dongfang 250 rtc

[scot]

yes I heard on another thread yes less teeth like from the 46 tooth to 38 tooth or smaller ,though I could be wrong it sounds right

[racerx125]

well my chain says 428H then a 100 which I assume means how many links it has
I'm not sure if this can help me look for a new sprocket with 6 bolts

[scot]

38 tooth ,what is the name of your bike if its like the bobber in another thread. the guys is going to change to the 38 tooth ,the chain just plan on takeing out some links

[alleyoop]

Since it is chain driven cheapest way to go is change the chain sprockets. You can do two things or both for more top end speed, MORE TEETH on the Drive Sprocket coming off the motor and or LESS TEETH on the Driven Sprocket on the rear wheel.
see if you see something on here that will fit:
Alleyoop

.ebay.com/sch/i.html?_kw=sprocket+6+bolt" rel="nofollow" target="_blank">.ebay.com/sch/i.html?_kw=sprocket+6+bolt

[racerx125]

seems much cheaper and faster to change the front sprocket rather than the rear wheel sprocket.
not really made of big pockets anyways