Tech Quest: How to make your 250 2-stroke mellower/easier to ride?

Swede
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402
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Uppsala, SE
Edited Date/Time 1/24/2012 8:19pm
Well, as the headline says, I would like to get some input from you guys on how to make a late model ('06 and up) 2-stroker easier to ride...

You see, I'm about to start riding big bikes again and earlier it was all about moto on 125's. But during the last couple of years, I've gotten more and more interested in woods riding (maybe it's an age thing, uh?) and as I live in Northern US/Canada type climate, I love to ride ice during the winter months ('cept moto and enduro).

Sure I can do all of that on a 125, I could even get an old KX500 just for the ice and still get me a '06-'07 YZ125 for moto/woods. But I would really like a more 'do-it-all' bike, meaning a little bigger engine volume. I'm not going to buy a 4-stroke, to afraid of engine failure costs (even though I would probably go 'faster' on a 250F).

Still I can't get a '06 YZ250 or RM250 out of my head, problem is they are a handful for my less than 140pounds (!) and as I said, I want to be able to do some enduro/woods riding too.

Do anyone of you have any good advice as far as mellow out [the low end] on a 250 and do it more woods friendly? Gearing is one thing, flywheel weight is of course another. Have anyone of you experience of taking away the spacerplate between intake/carb (to change the comp)?

There's also a pretty cool bike for sale not long from me, a '06 KTM SXS 250. 60hrs, very well maintained, bought new buy a Toyota carsales owner, not ridden by anyone with a Pro licence and on sale for 1/4 of the new price (which, as you may know, is almost double the price of a SX250). I've never owned a KTM, have heard some negative stuff, read a lot about this and that type of handling, suspension etc.

The reason for getting that type of 'exotic machinery' would mostly be the suspension, but at the same time, an YZ250 (with the SSS suspension and springs/revalve etc), is probably just as good for me (I would ofcourse have to buy new expensive springs front and back on the SXS too).

Or should I just go for a 200/250/300 Enduro bike instead?
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catatonic
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2/27/2009 3:31am
Put a flywheel weight on it.
2/27/2009 3:32am
thats easy, take off the powerband
WhKnuckle
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2/27/2009 3:33am
KTMs are great bikes, I wouldn't hesitate to buy one especially if you like woods riding. Flywheel weight is real helpful, and consider a VForce reed valve - they generally make a little more power than stock, but it's smoother. One other thing - the KTM has an adjustment for the power valve; you can adjust it to open faster or slower. I've never done it but I know KTM guys use it a lot. Check with KTM Talk, those guys know more about orange motorcycles than the people who make them, I think. KTMs are a religion over there.
WSR
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2/27/2009 3:38am
catatonic wrote:
Put a flywheel weight on it.
X2

The Shop

Racer92
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2/27/2009 3:59am
14 x 50 gearing
pitbike502
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2/27/2009 4:26am
Stoop wrote:
thats easy, take off the powerband
braaap
Swede
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Uppsala, SE
2/27/2009 4:36am
WhKnuckle wrote:
KTMs are great bikes, I wouldn't hesitate to buy one especially if you like woods riding. Flywheel weight is real helpful, and consider a VForce reed...
KTMs are great bikes, I wouldn't hesitate to buy one especially if you like woods riding. Flywheel weight is real helpful, and consider a VForce reed valve - they generally make a little more power than stock, but it's smoother. One other thing - the KTM has an adjustment for the power valve; you can adjust it to open faster or slower. I've never done it but I know KTM guys use it a lot. Check with KTM Talk, those guys know more about orange motorcycles than the people who make them, I think. KTMs are a religion over there.
Thanks for a good reply, WhKnuckle! Yeah, I forgot to mention the adjustable power valve on the KTM's (I think it's three different 'steps'). Don't know how far back in time, but the '08 SX also seems to have 2 different igintion curves, just as GasGas has.

The '06 SXS 250 comes 'stock' (if you can say that about a semi-factory bike), with a VForce cage.
catatonic
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2/27/2009 4:45am Edited Date/Time 4/16/2016 10:40pm
WhKnuckle wrote:
KTMs are great bikes, I wouldn't hesitate to buy one especially if you like woods riding. Flywheel weight is real helpful, and consider a VForce reed...
KTMs are great bikes, I wouldn't hesitate to buy one especially if you like woods riding. Flywheel weight is real helpful, and consider a VForce reed valve - they generally make a little more power than stock, but it's smoother. One other thing - the KTM has an adjustment for the power valve; you can adjust it to open faster or slower. I've never done it but I know KTM guys use it a lot. Check with KTM Talk, those guys know more about orange motorcycles than the people who make them, I think. KTMs are a religion over there.
Swede wrote:
Thanks for a good reply, WhKnuckle! Yeah, I forgot to mention the adjustable power valve on the KTM's (I think it's three different 'steps'). Don't know...
Thanks for a good reply, WhKnuckle! Yeah, I forgot to mention the adjustable power valve on the KTM's (I think it's three different 'steps'). Don't know how far back in time, but the '08 SX also seems to have 2 different igintion curves, just as GasGas has.

The '06 SXS 250 comes 'stock' (if you can say that about a semi-factory bike), with a VForce cage.
FWIW the '07-'09 Ktm's are Much better handling bikes than the '06 & earlier bikes. They also feel the most like a japanese bike.
The 200 in any form is a great bike.
flynbrian
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Geff, IL, USA
2/27/2009 4:57am
heavier flywheel, different pipe { 2 smoke pipes are tunable so you can get a Low end pipe to give more off the Bottem and less on top which is good for woods riding), quality reeds, and you can also gear it down a little. I have also heard some guys like the auto clutch but I have never used one.
Void Main
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USA
2/27/2009 5:16am
The YZ is already fairly tame. I run a Gnarly pipe (Fatty would be good too) which gives a slight improvement. The stock pipe is already very good though. Flywheel weight helps a little as already mentioned. I don't find it necessary but my bike is pulling around a lot more than 140 pounds. They're much more tractable than they were 20 years ago.

P.S. There is nothing wrong with being interested in woods riding/racing. It's the most fun you can have with your clothes on.
2/27/2009 5:24am
grow a set of nuts
crowe176
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Spring Lake, MI, USA
2/27/2009 5:26am
Add 2 more strokes.
BKiller
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2/27/2009 5:31am
If you are leaning towards a KTM anyway, you might as well get a 200. Funnest bike I ever owned. Would be perfect for a light guy like you.
WhKnuckle
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2/27/2009 5:49am
One other thing - I know it sounds silly, but I use a "Twister" throttle tube that has the bearing in the end and turns real smooth. I think it genuinely helps with throttle control. Pro Taper sells them.
FGR01
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Fantasy
2/27/2009 6:02am
There's also the G2 cam throttle tubes witht he different cable cams.

Also, some simple tricks: run a heavy o-ring (or x-ring) chain. They take some of the bite off the power. If the bike has aluminum clutch plates, put all steel ones in. Same as a flywheel weight. Also, running your jetting on the rich side also tames down the snap. Have to be careful though as this also makes the bike more prone to load up and foul the plug in tight woods sections.
500guy
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USA
2/27/2009 6:06am
in your case Swede , I would say gain 100 lbs and that puppy will be mellowed out perfect.
stumpjumper
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Muntucky, IN, USA
2/27/2009 6:21am
KTM, Adjust the powervalve,Get a rekluse,You're set! O And do'nt forget the barkbusters!
IntenseRider
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Mc Donald, PA, USA
2/27/2009 6:22am
Swede wrote:
Thanks for a good reply, WhKnuckle! Yeah, I forgot to mention the adjustable power valve on the KTM's (I think it's three different 'steps'). Don't know...
Thanks for a good reply, WhKnuckle! Yeah, I forgot to mention the adjustable power valve on the KTM's (I think it's three different 'steps'). Don't know how far back in time, but the '08 SX also seems to have 2 different igintion curves, just as GasGas has.

The '06 SXS 250 comes 'stock' (if you can say that about a semi-factory bike), with a VForce cage.
Swede:

Just as an FYI...the Gas Gas map switch will work on the KTM and it's fairly inexpensive (about $20 US).

I went from YZ250Fs to a KTM200 and absolutely love the bike. It has all the torque of the four stroke, but is a lot more snappy to ride and I don't have to go through the kick, kick, kick, kick routine that I routinely did on each ride with the YZF. For comparison purposes, I have been riding more woods than moto lately.

As others have said, a flywheel weight is an easy way to tame the bike. There are also aftermarket heads that "detune" the power. I have been told that the Yamaha GNCC team riders all use the detuned heads on their YZ250s.

BTW...a buddy of mine who has a Gas Gas 300 rode my bike once and now wants to buy it from me. I think that's a pretty good testament for how much fun the KTM200 is. Good luck with the new bike.
croom mx
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miami, FL, USA
2/27/2009 6:22am
Flywheel? save your money go buy a 2 teeth larger counter shaft, and learn to ride mellow. We call it trail riding.
thumpinberry
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Strawberry Plains, TN, USA
2/27/2009 6:31am
Swede wrote:
Well, as the headline says, I would like to get some input from you guys on how to make a late model ('06 and up) 2-stroker...
Well, as the headline says, I would like to get some input from you guys on how to make a late model ('06 and up) 2-stroker easier to ride...

You see, I'm about to start riding big bikes again and earlier it was all about moto on 125's. But during the last couple of years, I've gotten more and more interested in woods riding (maybe it's an age thing, uh?) and as I live in Northern US/Canada type climate, I love to ride ice during the winter months ('cept moto and enduro).

Sure I can do all of that on a 125, I could even get an old KX500 just for the ice and still get me a '06-'07 YZ125 for moto/woods. But I would really like a more 'do-it-all' bike, meaning a little bigger engine volume. I'm not going to buy a 4-stroke, to afraid of engine failure costs (even though I would probably go 'faster' on a 250F).

Still I can't get a '06 YZ250 or RM250 out of my head, problem is they are a handful for my less than 140pounds (!) and as I said, I want to be able to do some enduro/woods riding too.

Do anyone of you have any good advice as far as mellow out [the low end] on a 250 and do it more woods friendly? Gearing is one thing, flywheel weight is of course another. Have anyone of you experience of taking away the spacerplate between intake/carb (to change the comp)?

There's also a pretty cool bike for sale not long from me, a '06 KTM SXS 250. 60hrs, very well maintained, bought new buy a Toyota carsales owner, not ridden by anyone with a Pro licence and on sale for 1/4 of the new price (which, as you may know, is almost double the price of a SX250). I've never owned a KTM, have heard some negative stuff, read a lot about this and that type of handling, suspension etc.

The reason for getting that type of 'exotic machinery' would mostly be the suspension, but at the same time, an YZ250 (with the SSS suspension and springs/revalve etc), is probably just as good for me (I would ofcourse have to buy new expensive springs front and back on the SXS too).

Or should I just go for a 200/250/300 Enduro bike instead?
remove the spacer plate on the reed valve,that will mellow out yz and rm 250's
Moto East Mag
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Arlington, VA, USA
2/27/2009 6:50am
Practice.
The more you ride, the easier it gets to ride!

Adjust your power valve to get more low end and take off some top. It will be like a different bike.
todder
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Sw, WI, USA
2/27/2009 6:54am
Flywheel weight works better than gearing alone. Less tendency to stall with more inertia. Smoother than Fro.
-eagle-
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ZW
2/27/2009 6:56am
FGR01 wrote:
There's also the G2 cam throttle tubes witht he different cable cams. Also, some simple tricks: run a heavy o-ring (or x-ring) chain. They take some...
There's also the G2 cam throttle tubes witht he different cable cams.

Also, some simple tricks: run a heavy o-ring (or x-ring) chain. They take some of the bite off the power. If the bike has aluminum clutch plates, put all steel ones in. Same as a flywheel weight. Also, running your jetting on the rich side also tames down the snap. Have to be careful though as this also makes the bike more prone to load up and foul the plug in tight woods sections.
have you been in my garage?!Woohoo
aside from the throttle tube that is my EXACT setup.
mxrose3
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Delmar, DE, USA
2/27/2009 7:31am
The KTM 200 sounds like the perfect bike for you.
crowe176
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Spring Lake, MI, USA
2/27/2009 7:38am
Vitaltalk.com Unbelievable.
CR250Rider
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Moses Lake, WA, USA
2/27/2009 7:50am
i love the snap of a 2-stroke
calimxer91
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Lancaster, CA, USA
2/27/2009 8:12am
mxrose3 wrote:
The KTM 200 sounds like the perfect bike for you.
Rode one of these and was instantly impressed.Would get one in a heartbeat.Get the .200.
bullpen58
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Fresno, CA, USA
2/27/2009 8:40am
crowe176 wrote:
Add 2 more strokes.
X 100,000
09450f
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Temecula, HI, USA
2/27/2009 9:05am
i have a KTM 250 sx and the motor is wicked fast..its had the suspension done by pro curcuit and a pro curcuit pipe..i'm not sure if it had any engine work done on it ,but it really fast..it would probaly be good to put a flywheel on to tame the beast..it seems to be stone reliable also
mxpimp
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Seattle, WA, USA
2/27/2009 9:51am
Get in shape. Thats the best way to make it easier to ride and fun.

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