Tip & How-To about 2003 kawasaki KX 125

Get rid of the stock CDI use the 04 or 05 cdi

Want to really wake up the motor and feel some awsome power ? Get rid of the stock pipe and silencer V-Force reeds up one tooth on the rear sprocket . And toss the CDI Box replace it with an 04 or 05 CDI box then you'll have pleanty of over rev with out the motor poping or going flat up top the FMF Rev pipe with the short silencer is the way to go keep an eye on your jetting till you get it right use race gas Torco 2 gall race gas to 3 gall pump gas Ultra if you have the money have the carb riffled boared and head redone then look out all 250f's the kx 125 will kick ****..............

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2 Answers

Can you change tranny gears to decrease rpm's on highway? Or maybe change sprockets.


You can add teeth to the front sprocket or take teeth off of the rear sprocket. In the case of your bike , I do not think there is a 17 tooth front available so your best option would be to shorten your chain and drop from the 44 tooth rear sprocket to 40 tooth or a 36 tooth rear sprocket. That would be like adding one or two teeth to the front sprocket. Your stock is 16/44 so decrease from there. Be sure to ID your chain, get a chain breaker, and a new master link.

Feb 06, 2011 | 2004 Honda VT 600 C Shadow

1 Answer

07 YZ450F First gear is to tall but then it peaks out to soon along the long trail,wil changing the rear sprocket down a tooth help ?


Find out what the tooth count on the rear sprocket was from the factory and see if you have a smaller sprocket than stock. THIS WILL BE FOR A FASTER TOP END.
a larger sprocket will give more power /rpm less speed.
GOOD Luck

Jan 26, 2011 | 2004 Yamaha YZ 450 F

1 Answer

yamaha r125


Just remove the chain cover then bend the tab on the lockwasher away from the nut so you can then remove the nut. Install the new sprocket and put the assembly back together. Stock gearing is a 13 tooth front sprocket and 48 tooth rear sprocket. The stock chain is 112 links plus master link. The chain is DID 520D 112L. Please rate my answer. Thanks.
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Feb 15, 2010 | 2008 Yamaha YZF-R125

1 Answer

1979 GS 750 WHAT IS STOCK SPROCKET AND CHAIN SIZES


The stock rear sprocket is 41 tooth. The stock front sprocket is 15 tooth. The stock chain is 630 x 96. You can get OEM parts at www.babbittsonline.com/parts/viewbybrand/parts.aspx

Rear sprocket is $52.91. front sprocket is $21.74 and chain is $201.07
Please rate my answer. Thanks.

Dec 22, 2009 | 1979 Suzuki GS 750 E

1 Answer

My aprilia sr125 is really quick off the mark but the topspeed is less than 50mph and i know thats not right but i havnt a clue why its lacking speed, any ideas?


You didn't say that the bike was not reaching full revs. Therefor The only thing that limits top end is the gearing. Call the dealer and find out how many teeth are on the stock front sprocket and the stock rear sprocket. Chances are that you have maybe 1 tooth less on the front sprocket and 4+ teeth more than stock on the rear sprocket. The smaller the front sprocket and the larger the rear sprocket, the lower the top speed will be.

Please rate this answer. Thanks!

Mar 31, 2009 | 2000 Aprilia RS 125

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