What size sprocket for woods ridding?

Chris420 · 08-25-2008

I have a 99 KX250 with a 18" rear wheel and a 120/100/18 Maxxis IT tire. I do a lot of woods ridding and ocasionally hit the track. The woods ridding is mostly single track black diamond stuff and the track that I ride is really tight and I never get out of 3rd gear. I need to replace the front and rear sprocket as well as the chain and was hoping some one could help me with my selection. I am currently running a 12 tooth primary and a 49 tooth rear. I feel that I need a little more torque.

gerhardst · 08-25-2008

Kx250 has never really been known for torqe because of the purpose it was designed for. the power valve setup, exhaust design, flywheel weight & gear ratio's are all kilowatt based and not torque. but still i would stay with the 12 49 setup. gear down and rev it like only a kx can if you drop a tooth on the front sprocket the ratio change is quite dramatic (relative) Were if you maybe increase on the rear about 2 tooth it might be better. just remember if you increase your ratio (smaller front or lager rear) your gear ratios might be off and the result can be changing gears like crazy just to get up to 60mph good luck! at the end of the day its only trial & error to personal preferance

Billy B · 08-25-2008

Maybe go up to a 51 rear it will give ya some more pull off the bottom but also if most of your riding is trails i would think about a flywheel weight.

Chris420 · 08-25-2008

What are guys running and what kind of ridding do you do? Just looking for some opinions that could help me with my set up. I tried a 51 tooth rear sproket and it was to low. I am thinking maybee a 50.

mjsedg · 09-04-2008

On my 01 KX250 I dropped my primary to a 12T and it still didn't get what I needed either... I think BillyB is right by going with a flywheel weight. I've had a Steahly 11oz on for a few weeks, and it made all the difference. You can lug it like a 4strk, but makes the transition into the powerband much smoother and gives much more control when on the pipe, letting you run the motor the way it was designed. Best $100 I've spent on this bike yet.

balbirnie · 4 Weeks Ago

is there anywhere in the UK that sells flywheel weights?? i also do tree routes with bogs and ditches

Saleenguy · 4 Weeks Ago

Have you considered a a heavier, and stronger clutch basket also.

mjsedg · 4 Weeks Ago

Check out Steahly Off-Road. They are the best weights going with great tech support on selecting the right weight for your bike. I can't imagine why they wouldn't ship internationaly.

balbirnie · 4 Weeks Ago

Quote:

Originally Posted by mjsedg

Check out Steahly Off-Road. They are the best weights going with great tech support on selecting the right weight for your bike. I can't imagine why they wouldn't ship internationaly.

i will get in contact with them, cheers matey

08-25-2008	#1 (permalink)
Chris420 Still On The Kickstand BTK Beginner Join Date: Oct 2007 Posts: 41	What size sprocket for woods ridding? I have a 99 KX250 with a 18" rear wheel and a 120/100/18 Maxxis IT tire. I do a lot of woods ridding and ocasionally hit the track. The woods ridding is mostly single track black diamond stuff and the track that I ride is really tight and I never get out of 3rd gear. I need to replace the front and rear sprocket as well as the chain and was hoping some one could help me with my selection. I am currently running a 12 tooth primary and a 49 tooth rear. I feel that I need a little more torque.

08-25-2008	#3 (permalink)
Billy B Still On The Kickstand BTK Beginner Join Date: Mar 2008 Location: Columbia, Tn Posts: 40	Maybe go up to a 51 rear it will give ya some more pull off the bottom but also if most of your riding is trails i would think about a flywheel weight. __________________ Kdx200-RBdesigns modified head and carb KX250 fork swap FMF torque pipe FMF turbine core2 VF3 reeds

4 Weeks Ago	#7 (permalink)
Saleenguy Dazed and Confused Extreme Forum Supporter Join Date: Feb 2008 Location: British Columbia Canada Posts: 3,375	Have you considered a a heavier, and stronger clutch basket also. __________________ Riding is good for ones soul. Riding amongst friends is even better.

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08-25-2008	#2 (permalink)
gerhardst Newbie Join Date: Jun 2008 Location: Middelbrg South Africa Posts: 7	Kx250 has never really been known for torqe because of the purpose it was designed for. the power valve setup, exhaust design, flywheel weight & gear ratio's are all kilowatt based and not torque. but still i would stay with the 12 49 setup. gear down and rev it like only a kx can if you drop a tooth on the front sprocket the ratio change is quite dramatic (relative) Were if you maybe increase on the rear about 2 tooth it might be better. just remember if you increase your ratio (smaller front or lager rear) your gear ratios might be off and the result can be changing gears like crazy just to get up to 60mph good luck! at the end of the day its only trial & error to personal preferance

08-25-2008	#4 (permalink)
Chris420 Still On The Kickstand BTK Beginner Join Date: Oct 2007 Posts: 41	What are guys running and what kind of ridding do you do? Just looking for some opinions that could help me with my set up. I tried a 51 tooth rear sproket and it was to low. I am thinking maybee a 50.

09-04-2008	#5 (permalink)
mjsedg Still On The Kickstand Join Date: Aug 2008 Posts: 26	On my 01 KX250 I dropped my primary to a 12T and it still didn't get what I needed either... I think BillyB is right by going with a flywheel weight. I've had a Steahly 11oz on for a few weeks, and it made all the difference. You can lug it like a 4strk, but makes the transition into the powerband much smoother and gives much more control when on the pipe, letting you run the motor the way it was designed. Best $100 I've spent on this bike yet.

4 Weeks Ago	#6 (permalink)
balbirnie Newbie Join Date: Nov 2008 Location: scotland Posts: 13	is there anywhere in the UK that sells flywheel weights?? i also do tree routes with bogs and ditches

4 Weeks Ago	#8 (permalink)
mjsedg Still On The Kickstand Join Date: Aug 2008 Posts: 26	Check out Steahly Off-Road. They are the best weights going with great tech support on selecting the right weight for your bike. I can't imagine why they wouldn't ship internationaly.

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