Dirt tricks 13/47 set up

Anyone run this combo?
In need of a new chain and sprocket after 12,000km of hard running.
Using a 12T front and sprocket 43 rear - and like this gearing so want to keep this ratio - but back to a 13t front.
 
Thinking of the F1 13T front, and a YZ47 Rear - and a new Regaina ORN6 O-ring chain (520X120 Links).
 
Any reason why this wont work (besides new counter sunk bolts required)?

It'll work fine.

Go for it.

i don't see the wr250r in the parts index at dirt tricks ,does anyone know what bike it cross references with.i'm guessing it would be the same as the other yamaha bikes of it's era.99' to 12'.

rideonjon wrote:

i don't see the wr250r in the parts index at dirt tricks ,does anyone know what bike it cross references with.i'm guessing it would be the same as the other yamaha bikes of it's era.99' to 12'.

The f1 and yz part numbers in my first post were the ones I got direct from DT that will work. Just need new counter sunk bolts.
I'm still on the fence to go with the DT or a cheaper rocky mountain primary drive combo.

Switched from 42 to 47 rear on my X and couldnt be happier.

With the 13/47 tooth setup, will it cruise at high way speeds without wide open throttle? (70 - 80mph).

You bet. Maintains speed better too.

Wanted to go to a 47 on the rear myself but dont want to loose any offroad performance. Can someone put in some info on the offroad side of this sprocket. Would like to know more about it.

Do you mean that you're wondering if gearing the bike down with 13/47 sprockets would hurt performance off-road?
If so, the answer is a definite no way, Jose.
It only helps because the WR-250R comes geared too tall for everyday street riding, never mind riding over rough ground at lower speeds.
Gives much better gear ratios for riding in the dirt as well as better (closer) gaps from gear to gear.

Why are you switching if you don't mind me asking? 12/43 is pretty close to the same as 13/47. I ask because I've switched my front to a 12 tooth and the performance off road is fabulous.

LordEndo wrote:

Why are you switching if you don't mind me asking? 12/43 is pretty close to the same as 13/47. I ask because I've switched my front to a 12 tooth and the performance off road is fabulous.

I'm going to do the same as you, 12 tooth counter sprocket with stock rear. But that's because my bike is relatively new and I'm too lazy and/or cheap to put a new chain on. You need a longer chain to accomodate the 13/47 combo. Some say the smaller front sprocket contributes to excess chain wear on the chain slider and sometimes through the slider to the swing arm. I believe that to be true so I will be regularly monitoring the slider for wear. Next winter I'll replace the chain and both sprockets.

Hi, I'm wanting to put a 47 sprocket on with my standard 13 front too - what chain length do I need to order with the sprocket (or does anyone know if there is a kit available with 13, 47 and chain ready for WR250R in the UK as I can't find one?)
Thanks.

I'm making the same change. Either a 112 or 110 link chain will work. I'm ordering a 110 as I expect the 112 will put the adjuster where you can't get many adjustments later on.

I'm 12/47 now and had to put on a new chain when I did it. Bought a 120 link chain and removed probably five or so links if I remember correctly. I think the original chain was a 110 but there were a few links removed there too?