A forum for owners of Yamaha TTR250 trail and enduro bikes!

Rger8 · Member

opinions on a 12 tooth drive sprocket?

Cubber · Super Guru

Robert,

I've never heard of anyone using a 12 tooth gearbox sprocket. smile

Please go ahead and try it, then you can be first to report back to us all on your experience.

Martyn

Rger8 · Member

Wow, I'm hoping someone has tried it! I may give it a go and let you guys know.

Thanks!

Andy_C · Veteran Member

I ride with 13/52 and find thats geared low enough for me to tackle anything, i don't even bother with 1st gear, for the terrain i ride 2 & 3rd are sweet!
To be honest I not sure going down to a 12 front is worth the effort but I suppose its really down to what your riding on,you would know better than us, if you do I'd still be interested in knowing what you think.

-- Edited by Andy_C on Saturday 22nd of June 2013 11:09:12 AM

Rger8 · Member

Well I purchased a 12 tooth counter and initial report is that it is not as bad as I thought. Bottom line: It now rips off the line up to about 60mph. I lost a lot of top end but it may be just the ticket for Off-road use only. I would say it would be ok crusing around 50-55 mph short burst up to 60mph if needed after that she starts to be kinda unhappy. I will give a total report once I get it off-road and see how it works out overall.

My goal was to get a bit more punch off the bottom without spending much $$$. $8.99 for the sprocket, $7.00 shipping.

Next will be some inexpensive suspension upgrades, any suggestions appreciated. Maybe use of heavier oil in forks, air pressure ideas. setting sag, etc..

Later!

Rger8 · Member

Feedback on my 12 tooth counter sprocket. It is very useful off road, It pretty much rips now. I primarily use 3 & 4th gear in the terrain I ride in (desert) and still has plenty of top end. It has a lot more punch off the bottom now. The stock gearing seemed fine but this seems to make it a whole lot more fun. I believe I can still pretty much cruise at 6O mph. I would only recommend this for primarily off road use.

:)

Andy_C · Veteran Member

Ta Roger ,thanks for the update

bbarfield · Veteran Member

I'm glad to hear the 12 tooth worked well. i just bought one as well, as I need more low end torque. My 2003 is definitely losing some steam and, in 2nd gear, any loss in momentum on a hill clim just kills it. So I'm hoping the lower tooth will give me that sweet spot for climbing in 2nd, and allow me to stay in the power in 3rd while cruising around corners.

petenz · Super Guru

I,m running 13/47.... Have a 12 .. I might try for the next enduro...
Should be a bit easyer on the Rekluse in real tight slow stuff..

TTRfan · Super Guru

I have always taken the view that a 12-tooth front sprocket would be hard on the chain because of the tighter radius. Any views on that aspect please?

Brian

petenz · Super Guru

you are right... I have noticed that the smaller you go
the quicker the teeth hook.... bigger is better...
I usealy go though 2 or 3 engine sprockets to one rear...

bbarfield · Veteran Member

I installed a 12 tooth last week and finally got a chance to ride a few days ago. I was very pleased with the performance. I get noticeably more pull in the first three gears. Yes, I lost a little bit of range in each gear, but it wasn't a problem. I now have to learn how to ride the clutch a bit because the front wheel tried to come up on a few hill climbs and that's never really happened before. But that is proof of the increased power. I was especially pleased with the increased low end torque in 2nd and 3rd when pulling out of turns. The back end even tried to dance just a bit. I would guess about 15 to 20% more low end torque. This is a great mod for trails!

Hp · Veteran Member

What you chaps running on the back with the 12t front? 52?

Hp · Veteran Member

Well its been a while since I asked, so the update is I have a 12t 52t combo and it rips in the forest and on crazy short steep hill climbs, top end speed is no higher than 60mph but a cruse at 40mph between off road sections is no drama.

If you ride mainly off piste this is the perfect set up

petenz · Super Guru

Hp wrote:
Well its been a while since I asked, so the update is I have a 12t 52t combo and it rips in the forest and on crazy short steep hill climbs, top end speed is no higher than 60mph but a cruse at 40mph between off road sections is no drama.

If you ride mainly off piste this is the perfect set up

i have just put 12/52 sprockets on... it's a diffrent bike "well almost"

1st & 2nd theres enough snap now to lift the front wheel... 1st easy , 2nd with

a little help... with the lower gearing the motor is spinning harder so the

Rekluse auto clutch locks up with a lot more vengance.... As stated above prob only good for

around 100kph.. But hay lets get relistic the rest of the bike is not realy capable of

much more on rough ground with out a suspension transplant.. that 05 YZF250 front end

in the shed is looking good now...

The winter enduro series starts soon.. I might compete in the clubmans class " bunny ride"

Expert class would be a bit much...