Low end power

I just bought a WRR last week and am enjoying it but it seems to have no power under 8MPH. It is a used bike and the previous owner had a GYTR slip-on exhaust put on at the dealer which eliminated the ExUp valve. Does anyone know if this significantly reduces low RPM power? My previous trail bike was a '03XR250R and it could tractor up the gnarly hills. On the WRR I have to gas it and go which is okay some of the time but throw in a sharp turn on the hill and it doesn't work. Any ideas on how to get more low end out of these bikes?

Sloth wrote:

I just bought a WRR last week and am enjoying it but it seems to have no power under 8MPH. It is a used bike and the previous owner had a GYTR slip-on exhaust put on at the dealer which eliminated the ExUp valve. Does anyone know if this significantly reduces low RPM power? My previous trail bike was a '03XR250R and it could tractor up the gnarly hills. On the WRR I have to gas it and go which is okay some of the time but throw in a sharp turn on the hill and it doesn't work. Any ideas on how to get more low end out of these bikes?

re-gear

12 tooth front sprocket to start.....although that'll make that mess that's a speedometer even more inaccurate.

Yes a 12 tooth would give it more power at low speeds but does anyone know if there is a way to get more low RPM power from the engine? Anyone else have a GYTR slip on with no other mods and did it help or hurt? The previous owner says it helped the power throughout, from down low to higher RPMs. I am wondering, if I replaced the stock exhaust would it have more power at low RPMs.

hmm, dude the way I see it there's only so much "low end" power to be had from such a small displacement motor..

The WR-250R is street-legal while the XR-250R was not, so the WR is corked-up with silly EPA regulations.
It's also geared to the moon (very tall), also for silly sounds test criteria.

Go to the Sweet Mods forum and read-up on the airbox flapper elimination, fuel injection programmers, and what sprockets are popular.

Just regearing to something like the XR had (probably something like a 50-tooth sprocket on the rear) will help quite a bit.
I've got the airbox flapper elimination, full FMF exhaust, FMF Power Programmer, and 12/45 sprockets, and there's enough low end to putt along at crawling speeds. :)

eliminating the EXUP valve and adding a slip on, you actually lose low end power.

put the stock exhaust and EXUP back on, and its much better. i really didnt like the bike with the FMF pipe on.

also, i dont think this bike will ever have the low end torque of the XR250. The WRR is tuned for mid-top end power.

Two things can be done.

1) Change the gearing. The motor, with stock gearing, won't run slow enough for real technical stuff. With 13/47 gears (and D606's) I can roll around at 5mph comfortable and tractor around all I want.

2) Change your riding style. This motor like to be revved, keep the rpms up and have at in a lower gear maybe?

I've got the 12 on the front and I have lots of grunt. I can ride over stumps and logs and rocks without a hiccup, which is nice where there isn't an actual trail.

SheWolf wrote:

I've got the 12 on the front and I have lots of grunt. I can ride over stumps and logs and rocks without a hiccup, which is nice where there isn't an actual trail.

Oh hell, like the one we were on... That was horrible...

But yeah, your little R2 had no shortage of umph, your were spinning that rear tire free a good number of times.

I agree with Shewolf on this one, get a 12 T front. Speaking of smaller fronts... do any exist for a 95 XT350?