2001 KX 125 Woods Conversion

[Defy]

Hello All, This will be the first of MANY! posts here from Texas! So heres the story (short version) I grew up riding a 4 strokes just bought my first 2 stroke and i need to have some bottom end!!! I don't plan on taking it to the track its mainly to tool around with in the woods with my dogs. I know i should have bought a 4 stroke but this thing is sooo light i love it! Anyways i have been doing some research and i think i need the following items to give me som bottom end:

Front/Rear Gears
Pipe/silencer
flywheel wieght
Carb rejetted/tuned

does that sound right? If so what size/types should i buy? like smaller front gear bigger rear? or visaversa? Let me know what you think? Thanks

Nick

[YurFatMom]

For your KX125,
1st, add one tooth to the rear sprocket, dont go down on the front, it is very hard onn your chain.
2nd Get a FMF Fatty and if you ride in a closed course, get a PowerCore2 Shorty. If you ride in a public area get a PowerCore 2 SA.
3rd Get a set of stiffer clutch springs.
4th Get a set of Boyesen Pro Series Carbon reeds(or a Rad Valve $$$ though).
5th If you can, get it ported for bottom end power.

I have these mods on my 01 KX125(except porting), and I can tool around the woods and rip it up at the track with out changing anything. It gives you a very smooth, puched up, easy to use powerband. I have as much bottom end as my friends RM134, and I also have wayy more over rev power. It was definately better than stock.

[Defy]

So heres what i think

14 tooth front
50 tooth rear
9 or 11 ounce FWW
FMF fatty pipe/silencer
and then taking it to somone to jet/tune the bike

Sound good? I was researching some and someone said "Heavy Clutch Springs"?? Would that help?

I am also looking for help on suspension set up? I am 165 on a kx 125. Thank in advance

Nick

[YurFatMom]

Your gearing you picked out would make it horrible in the woods! It would have very weak power and would go about 100mph! You should run a 12 tooth front sprocket, and a 50 tooth rear.

Try it without the flywheel first, I dont think youll need it.

Mostlikely it will not need to be jetted, unless the last owner screwed it all up.

Heavy Duty clutch springs are a must have.

I dont remember where my clickers are at, (I wiegh the same as you) but I will go check them in a bit.

When you buy your parts, dont forget to get a good helmet!

[Defy]

sweet i will try the springs/gearing and pipe and see how that is. Thanks

[YurFatMom]

Get reeds too, to go with your pipe.

[Defy]

Sounds good, any good places to buy them from besides Ebay?? I also need a rear fender a wheelie kinda got away from me...

[Defy]

one more, should i get the reeds or the reeds and the reed block??

[griffbones]

Personally the first two things that go on our woods bikes are bark busters and a flywheel weight. The FWW makes them so much smoother and less apt to stall in the tight woods.

[YurFatMom]

Yes, Bark Busters have saved my precious fingers quite a few times. Griff knows what he's talking about, go with the flywheel.

[Defy]

Cool so I think I will proably put the gear/pipe/reeds on first because the pipe is beat up and it still has the orignal gear and chain so it's time for a change then i will look into a FWW. But for the reeds do i need to buy just the reeds or the whole thing?

[YurFatMom]

A reed cage will give you the most boost, but it is also quite pricey. Reeds themselves will also give you a power boost, just not as much as a full cage would. Unless you really want to spend $150 on a cage, I would say just get some carbon fiber reeds.

I put a Rad valve on my '91 RM125 and it gave it some nice power, but it is mostly mid and up power.

[Defy]

Cool, i will just do the reeds, i don't need top end where i ride i am lucky to get into 5th gear and if i do it's only for a sec. I just really need some low end.

[Defy]

ok So i need:

- 12 tooth front gear
- 50 tooth rear gear
- Boyesen CF reeds
- FMF Fatty/Power Core 2SA

So what type of FWW and 9oz or 11oz
Clutch springs? Brand/type?
Is the Gnarly pipe better than the fatty?

[YurFatMom]

Looks good, you'll have to ask Griff on the FWW. I use EBC clutch springs. You can not get a Gnarly for a 125, they are only for 250's and 500's

[griffbones]

Steahly should be able to recommend a weight for your purposes, but I will say this, the heavier the weight the more dramatic the effect. Steahly almost always list three different weights for most applications, I normally go with the middle becuase I want to actually gain something, but I don't like them to become to four stroke-ish if you know what I mean.

[Defy]

Thanks all I just realized that i spent way too much money this month so i think i will just go with the FWW for now and get the pipe and such next month. So i will let you know how it works out!