96 yz250 powervalve adjustment????????

[xtchahos]

hi guys

i recently brought a yz250 96
does anyone now how to adjust the exahaust valve as im using the bike in the woods and i need to calm it down a bit im trying to get a bit more torque.
i need the valve to open later in the revs if possible??????????

ive rode a rm250 for years and the power valve on that was easy to adjust
the yz iz much faster

[Fluffyhead]

Which year RM 250? Curiously - what was your technique for adjusting the power valve? Spring tension change?

Sean

[MotoMan]

Originally Posted by xtchahos

hi guys

i recently brought a yz250 96
does anyone now how to adjust the exahaust valve as im using the bike in the woods and i need to calm it down a bit im trying to get a bit more torque.
i need the valve to open later in the revs if possible??????????

ive rode a rm250 for years and the power valve on that was easy to adjust
the yz iz much faster

I am not aware of a way to adjust them...I know you can buy different tension springs for the arm that comes up out of the case, but only from different year bikes....and I can't remember what years do what....been to long.

Try going up a tooth or 2 on your rear sprocket, or install a shorty type silencer, those work GREAT for more power down low.

[MXtras]

As far as I know, changing the spring is the only way to alter the actuation of the valve.

Have you thought about adding a flywheel weight?

You could also de-tune it a bit by using a thicker base gasket, or use two stock base gaskets.

Scott

[MotoMan]

Originally Posted by MXtras

As far as I know, changing the spring is the only way to alter the actuation of the valve.

Have you thought about adding a flywheel weight?

You could also de-tune it a bit by using a thicker base gasket, or use two stock base gaskets.

Scott

Yes the flywheel weight is def a good idea as well!!

[xtchahos]

Originally Posted by Fluffyhead

Which year RM 250? Curiously - what was your technique for adjusting the power valve? Spring tension change?

Sean

hey sean the bike was 88rm250 so u could adjust the valve from the
side of the head from cold 1 half a turn ani clockwise the power band would kick all the time and then a small turn at a time clockwise until u find the balance of power!!!!!

[xtchahos]

Originally Posted by MotoMan

I am not aware of a way to adjust them...I know you can buy different tension springs for the arm that comes up out of the case, but only from different year bikes....and I can't remember what years do what....been to long.

Try going up a tooth or 2 on your rear sprocket, or install a shorty type silencer, those work GREAT for more power down low.

hi there that was good advice i changed the rear sprocket from a 49tooth to38tooth and the bike pulls through the gears now rather than pointing for the sky in every gear

wot kind exhaust would you think is best?????

thanks for your help

[xtchahos]

Originally Posted by MXtras

As far as I know, changing the spring is the only way to alter the actuation of the valve.

Have you thought about adding a flywheel weight?

You could also de-tune it a bit by using a thicker base gasket, or use two stock base gaskets.

Scott

hey scott i dont know anything about flywheel weights????
do go heavy or light wot would u recomend ?????

thanks for your help!!!!

[MXtras]

Help with flywheel weights will have to come from someone else - I have no experience, sorry!

Scott

[MotoMan]

Originally Posted by xtchahos

hi there that was good advice i changed the rear sprocket from a 49tooth to38tooth and the bike pulls through the gears now rather than pointing for the sky in every gear

wot kind exhaust would you think is best?????

thanks for your help

Well if you took teeth off the rear sprocket you actually just spread the gears out more making each gear longer. I was thinking you wanted more power on the low end, in that case I would look into flywheel weights for sure, that will tame the hit down even more.

Look at Dr. D's site for info on them.

[yz250guy]

I owned a 96 YZ 250 for more than a decade. Great Bike. I put an 11 oz Steahly flywheel weight on it for woods riding. Best mod I made on that bike. I left both sprockets stock. The flywheel weight is super easy to install, and the ones from Steahly come with instructions, and their customer service is excellent. I would highly recommend this mod for woods.

[xtchahos]

hi again i fitted a 11oz flywheel weight to the yz and man wot different bike to ride in the woods smother and lot more easier to use power and no stalling brilliant cant wait to get back out on it again

thanks for a great bit advice.any other good mods u made???
regards paul