16th tooth sproket?

[01ytrx400ex]

Can anyone tell me if a 16 tooth front sprocket fits on a 400ex or if not what would be the equivalent in the rear sprocket? How many teeth?

Thanks!
:rolleyes:

[MOFO]

Personally, I havent put one on. But I have heard of other guys running a 16t with no problems. It should fit....


Eric

[Razorback]

It'll fit, but the case saver will not (I've heard).

[Wheelie]

I read in a Dirt Wheels that a 36 rear sprocket is made, it won't make the difference that the 16 front will, but you can save the case saver and still experience more speed.

[01ytrx400ex]

Thanks guys, What is the factory rear sproket size? Rocky Mountain has 38 and 39 tooth sprokets.

[crday98]

if i'm not mistaken i think the stock size is 38?

[01ytrx400ex]

So if I wanted more top-end would I want a larger or smaller rear sproket?

Thanks!!!!:huh

taller for top-end smaller for bottom-end

[Wheelie]

Stock rear is 38 and front is 15.

For more top end speed you would want either a larger front or a smaller rear.

For more off the line acceleration and less top speed you would need a smaller front or a larger rear. Good Luck

I have one and yes it does fit. It would be the same as going down two teeth in the rear, the only reason I have one is because with the 426 kit it does wheelies too easy... For a stock bore 400ex I dont think It would be worth it.

426ex_Shift#47-

My 416 is similar...all kinds of power--wheelies like crazy on pavement/hard pack--but enough power thru the powerband to smoke 250R's and LT250R's in drags UNTIL 5TH GEAR (6th for them), when they pull away SLOWLY...

3 questions for ya:

1. Will the 16T front require me to add links to my chain? I have the stock chain--i'm sure its stretched a bit, but will I need a new (longer) chain if I get a 16T front? Or is a quick chain adjustment all i'll need?
2. Will I noticeably lose bottom end? (see my motor mods below)
3. Any idea what the 16T adds for top end? Will I be able to keep up with the 250R's, even when they are in 6th?

Thx

1) No I did not have to add links to my chain, but you will have adjusting to do.
2) You will lose some bottom end but Mine still launches great.
3)My 426 will beat a stock raptor and will keep within 2 to 3 lengths with a piped and jeted raptor. Not sure about a stock 250r's, stock banshee's no problem.

Doug Eichner runs the 16/36 gearing on his Duncan 440 and also has a case saver at that....Try contacting Duncan Racing about one.

You basically get the same gearing ratio of the stock 15/38 20"
with switching to the 16/36 18" or so the math says so :D

Later

Thx 426ex.

With stock gearing on my 416, I too am within 2-3 lengths of a piped/jetted Raptor in drags....(have not dragged a stock one) and can pull modded 250R's thru 4th gear in drags...then they all pass me (slowly) at top speed and run away. So adding the 16T front, my quad should have enough power to pull it off the line, and give me the top end I need to stay with these guys thru 5th...or at least a bit closer.

Chadwick-
Yeah, I've heard of case savers fitting with a 16T front, but I want to keep the stock chain guard....which apparently can be done with some minor grinding work done to the guard...