Two-stroke performance tuning?

**B.Crump** · 1st August 2009, 15:13

not major power im after all tho i wont complane if i do im just doing it for fun to see what i can do. a 250cc will be to heavy as the motor is behind the seat it all ready nearly does wheel stands when you change gears .iv got a spair tf125 motor complete im gona do it to that one and see what hapens

**bucketracer** · 15th May 2010, 16:32

Originally Posted by TZ350

………could this work? a 24mm carb feeding into a plenum chamber and the 34mm rotary valve inlet feeding directly from the chamber to the motor. That way the motor sucks full atmospheric pressure through a high flow 34mm bell-mouth and at WOT the restrictive 24mm carb can keep the plenum full.

TeeZee350’s very clever plenum chamber

Starts easy and idles http://www.youtube.com/watch?v=YxiEo8cgopg

A bit of a blurt up the drive http://www.youtube.com/watch?v=p4ef-WUO1Qs

**Buckets4Me** · 15th May 2010, 16:49

ta da!

**Buckets4Me** · 7th June 2010, 09:02

still waiting to hear what the results of this experiment where

**TZ350** · 8th June 2010, 20:21

.

Buckets4me pulling in his second win for the day and Chambers in third on the notoriously treacherous Mt Welly track when its wet.

**SS90** · 8th June 2010, 20:24

"B Grade", in the wet?

You must be proud.

**Buckets4Me** · 8th June 2010, 20:35

Originally Posted by SS90

"B Grade", in the wet?

You must be proud.

yep very. Show us a video of you winning will ya

thats unless you want to start a pissing match again lol

and dont forget that I'm a slow B grade rider and was running better than mid pack at Taupo

I am quite happy with the fact that I managed to stay upright that day (even with slicks in the A grade that day)

**Buckets4Me** · 2nd September 2010, 09:48

Thomas

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Tim

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My bike on the dyno 18.5 H/p at the rear (not bad for a 4 year old engine)

**kel** · 14th September 2010, 21:55

18.5Hp

My FXR puts out a meager 13.2Hp. I've always loved 2 strokes but when I saw the claimed figure of 20Hp for the FXR I thought 4 stroke technology (and extra displacement) had finally eclipsed the 2 stroke bucket so bought the thumper. Lesson learned, have just purchased a KE125 look forward to swaping ideas with you guys as mods develop

**TZ350** · 14th September 2010, 22:45

Originally Posted by kel

........have just purchased a KE125 look forward to swaping ideas with you guys as mods develop

HP is not everything in Buckets, drivability and handling are pretty big ticket items too and FXR150's are hard to beat in the drivability and handling department.

I hear the hot setup for a KE125 is to fit a RG400 cylinder, 28mm carb and a good chamber.

**F5 Dave** · 15th September 2010, 09:22

Originally Posted by TZ350

. . I hear the hot setup for a KE125 is to fit a RG400 cylinder, 28mm carb and a good chamber.

Yeah they don't just 'drop on' though.

**kel** · 15th September 2010, 10:49

The Steadman mods from 2 decades ago, no doubt they are still very competitive bikes but there's better material to work with if going for the water cooled 100.
The KE125 wasn’t planned it was one of those bargains that you can’t pass up. TZ I'll be working to older motocross type power delivery so a fat power curve is the aim although I admit the peak power spread of the FXR will be near on impossible to match. My original bucket way back when was a KH100 ported to G31M-A (Centurion) spec, it had a good spread of power and was quick, figure the 125 can be that much better again.