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Replace sprockets up speed lower rpm

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More power from tc 250 2010


Top end engine rebuild. Sprocket size depends on the type of riding. Standard should be OK for motocross. If you need more top speed install a larger front sprocket and a smaller rear sprocket. Divide the rear sprocket teeth by the number of teeth on front sprocket e.g 48/14 = 3.43 a lower number means higher top speed 45/15 = 3.0 but compromised performance at lower speed. For tight forest riding and steep hills Rear 48 front 13 = 3.69 etc is preferable.

Dec 21, 2012 | 2010 Husqvarna TC 250

1 Answer

I have a 2002 suzuki marauder 805cc. i would like to know if there is any way to get alittle more top end out of it or lower the rpm to speed ratio in general. i am considering buying a 16 tooth sprocket,...


You do not need to alter anything except the chain, increasing the tooth on the front sprocket and decreasing the tooth on the rear will give you more top end, remember more teeth longer chain required, less teeth shorter chain!!

Mar 12, 2011 | Suzuki VZ 800 Marauder Motorcycles

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

Hello iwould like to lower revs by 1000at say 70mph what sprockets do i need


You will need either a larger transmission sprocket or a smaller wheel sprocket. The larger percentage change will occur with an increase in the front sprocket number of teeth. The way to mathematically determine that is to consider the present tooth ratio/RPM and relate that to the desired ratio. There are practical limits on how big the front sprocket can get before having interference problems. A 2-tooth increase should come fairly close. It would take about 4 to 6-tooth decrease in the rear sprocket to achieve the same results. Take your pick--the front sprocket should be cheaper and much easier to install. You will need to adjust the chain length accordingly. There will be a minor acceleration decrease due to the change. A fatter rear tire will also increase speed somewhat too. Hope this helps!

Jan 20, 2011 | 1992 kawasaki Zephyr 1100

1 Answer

Will tacho be accurate?


depends on what and where you are measuring ... if you are measuring rpm of the crank shaft ... there should be no change baced on different drive sprockets. The speedo will be different and the RPM will not match the expected speed because you changed the size of the drive and driven sprockets.

Jun 05, 2010 | 2004 Triumph Triumph Bonneville

2 Answers

I need to know is smaller sprocket rear for fj1100cc


Smaller sprockets will only give you about 500 less RPM.

May 03, 2010 | 1984 Yamaha FJ 1100

1 Answer

Gs 700 engine screaming at highway speed


cheapest way to lower the rpm is to replace the front sprocket to a larger size, or if easier for you a smaller rear sprocket. you will loose torque at take offs in first gear. also, do some math before you buy a sprocket, front you will need at least 2 more teeth to notice a difference, where at the back it would be like 8 less. see whats available. for harleys there are all kinds of sizes available, for your year im not sure but look around.

Jul 22, 2009 | 1985 Suzuki GS 700 ES

1 Answer

How many teeth on the standard front and rear ccm 604e 2001


there is no real standard sizing, just keep in mind Smaller sprockets = higher top end speed but lower acceleration and Larger sprocket = low top speed but high acceleration so the size you want is totally dependant on what you require from the bike. eg. if you ride enduro then you probably want something in medium size range so to get decent acceleration but with a good top speed.

Jul 06, 2009 | 2007 CCM FT35s

1 Answer

I want my powerband to come in at a lower rpm. it comes in at 3/4 qt throttle! 96 rm 125


You can experiment with different expansion chambers. The cone shape of the chamber bounces a sonic shock wave back to the exhaust port. The wave forms a pressure "wall" at the port to "seal" the exhaust port so intake gasses don't escape. Change the wall timing and you change the powerband. This is the expensive way and with no guarantees. The bike may already have the best possible chamber.

I suggest you go a different route. Just go up about four teeth on the rear sprocket or down one tooth on the front sprocket. This will mean the bike will have a lower top speed but more torque and earlier powerband relative to mph speed. Bottom line is you will come out of the hole quicker with higher revs and reach the powerband sooner. The loss of top speed is overcome by the speed out of the corners. Generally, more time is spent in first, second and third than the brief moments spent in fifth or sixth.

Please consider a top rating for this solution. Thanks!

Jun 01, 2009 | 2003 Suzuki RM 125

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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