SPROCKETS AND CHAINS...

[bigwake]

ok so i need to replace the chain on my 03 yz450f..i am going to just replace chain and both sprockets all together..i want a trail set up with my sprockets and chain..not race size..so can anyone give me my guidance on a trail size sprocket? front and back? stock size on my bike is 14/49..pretty sure anyway..i know the 49 is fact..not sure about the 14..but near possitive..any help? thanx-josh

[Black450R]

Since nobody else has commented...

Keep the front sprocket the same.  Changes on the front make too big of a difference.  So make sure you know for sure what size you already have.  Your best bet is to leave them both as they are if you don't have any complaints with how it already feels in the trails.

If you're nearly stalling a lot, or trying to shift down when you're already in 1st, then add a tooth to the rear. 

On the other hand, if you're coming out of corners and having to shift up really fast, or the rpms feel too high when you're in the corner or immediately after, then go down a tooth in the rear.  It will make it pull longer.

Most people will tell you to get a bigger rear sprocket for trails.  *Front sprocket sizes work in the opposite way than rear sprockets.  (ie: Going to a bigger front sprocket works like a smaller rear, and a smaller front sprocket works like a bigger rear.  But with more effect.)

[bigwake]

ok thanx for the info! -josh

[Mars]

Depends on the trails you ride.
Fast/average trails: I would leave it stock.
A lot of tight trails: I would gear down.

[bigwake]

ya im going to leave it how it is..the prev. owner actually changed the rear as it is..49 instead of 48..so mayb it will be fine