need to replace back sprocket soon... need lower gearing...

[wvhunter]

ok so i have a stock back sprocket... i dont know how many teeth but i deff want lower gears cause i ride woods... and only woods... yea i know a wr is what i need but i got a yz450... so what tooth rear would you guys recomend for woods riding?

[rdefonce]

probably at least 3 teeth larger than your stock sprocket.

I don't even ride woods on my 450 very much, but even on tracks, I went with a 50T (stock is 48T) and it's better all-around.

[BDubb106]

Give a 50 or 51 tooth rear a shot. It will be a pretty drastic improvement down low but wont kill your top end either. These 450s have power for days.

[cereal killer]

I use a 50t for woods racing, but it will depend somewhat on your riding speed. Sometimes I ride with a local off-road club and I end up feathering the clutch way too much to go as slow as the guys riding WRs. If you go bigger than 50t then it would help with really slow speed stuff, but you may need a longer chain too.

[wvhunter]

yea and some stuff i ride is technical so the low end is needed... it is anoying how jumpy they are in first gear

[YZPaGuy]

Don't go any higher then a 51 tooth. I put a 52 on the back of my 450 and it was way too much low end power. I tried it for two rides and took it off. It was next to impossible to keep the rear tire connected to the ground. It just spun every time I tried to get on it. Just my experience. If you were closer i would let you try it. It's brand new. LOL

[FinchFan194]

I run 14/49 with my Rekluse and it is awesome in the woods, the Rekluse takes care of the technical stuff and the higher gearing tames the power.

[wvhunter]

ive always heard about reckluses but never fully understood them... can somone explain?

[grayracer513]

The Rekluse is an auto clutch. They make 3 different designs of them. They all operate on centrifugal force, and will both automatically engage and disengage the clutch at the preset RPM you set them up for. The result is that the engine is nearly impossible to stall, and the clutch will be modulated exactly as much as it needs to be whenever it needs to be without your input or attention to the matter.

All 3 models can be overridden by a clutch lever in a reasonably normal manner. The downside is that one of the 3 can't be bump started at all; the other two can be temporarily adjusted so as to be able to bump start if required. They're extremely useful in any kind of off-road situation with high-strung MX bikes like the YZF.

[FinchFan194]

Gray mu Rekluse still stalls at times when I get a little too throttle heavy at low rpm, is that from my technique or do I need to go down one pilot jet?

[grayracer513]

If it stalls when you chop it after getting on the gas at low speed, it's the pilot too big and/or too low an idle speed. It could also be that you have the engagement rate set too quick.

If it stalls on opening the throttle, that's another problem.

[FinchFan194]

Stalls on opening the throttle.

[grayracer513]

Does this occur when you're in maybe a gear high most of the time?

Which Rekluse do you have and what setup combo did you use (mid/soft, mid/hard, etc.)?

[FinchFan194]

It usually happens at a low speed and it is certainly possible it is because I am a gear high. I have a Z-start Pro and I am running both springs and all ball bearings...thinking of ordering the tungsten kit soon

[grayracer513]

It usually happens at a low speed and it is certainly possible it is because I am a gear high. I have a Z-start Pro and I am running both springs and all ball bearings...thinking of ordering the tungsten kit soon

So then, you are set up "mid speed/quick engagement rate". I had the same problem with mine. Remove 3 of the 27 balls so that there are 24 in the clutch. Make the spaces evenly 8 balls apart from one another. This will let the clutch engage at the same speed, but a bit less aggressively ("mid speed/slow engagement rate), and should solve your problem. It's the exact opposite of adding the tungsten kit, which would be the wrong way to go, IMO. Try it. Costs nothing.

[FinchFan194]

Ok I will give it a shot and do some testing next week.

[WB450]

I like a 50.

[mliebal]

I have the core exp on my 09 yz450. There is so little engine slip compared to the z-start pro that was in yz250 that low speed is too jerky. I dropped the gearing to a 52 rear with 13 front. What this does for me is in those super technical sections I have enough engine rpm to keep from being too jerky. Too low rpm is just that, not controllable and very close to stalling. Not comfortable on some rock ledges, or multiple tree roots into a super tight turn. So far the 52 is good. I am contiplating selling the core exp to go back to the Z-start to get more slip.

Anyone else have similar experience?

[grayracer513]

The Core EXP can be tuned the same way as the Z-Start Pro can, except that you have to disassemble the actuator ring. By mixing or changing out the springs, you change the engagement RPM. By removing or adding wedges you change the rate at which the clutch applies.

All that's in your instruction sheet. If you can't find it, Rekluse makes it available online at their web site.

[wvhunter]

Don't go any higher then a 51 tooth. I put a 52 on the back of my 450 and it was way too much low end power. I tried it for two rides and took it off. It was next to impossible to keep the rear tire connected to the ground. It just spun every time I tried to get on it. Just my experience. If you were closer i would let you try it. It's brand new. LOL

what year is your bike? will all the 450's match up with cogs? wana sell me yours maby? aluminum or steel?