i would change them, for what ceramics cost its worth it, the motor is much smoother and pulls out of corners better, and also you will get alot more reliability out of it, since ive had sirio ceramic bearings in all my sirios the bearing maintenance has halved if not more

well my sirio .12 evo2 is close to needing a rebuild .anyone know who might have available a piston and sleeve set or where i can order one ???

its quite hard to indicate what is the coz..you should at least get a minimum of 5-6 minutes runtime per tank

i suggest u check
1.your centax spring tension. maybe not enough tighten
2.your low needle
3.your main needle
4. also your idling should not be too high.

Thank you for your help...I have just buy sirio ceramic ball bearings and a new conrod..
I have only one question...When i opened the engine i saw the cranksaft a little black is this a problem..?

I'm new to Sirio on road 21's & find myself with a choice between current and older engines. How does the current S21CL7RSTI compare to the earlier S21 WCR? Is there a performance advantage between engines? As the CL7 STI uses ceramic bearings, would it be beneficial (or feasible) to upgrade the bearings in the WCR? Any suggestions?

i recently purchased this engine for my tmaxx 3.3. i just need to know what the base needle settings are because the manual that came with it is not very usefull

im in the process of breaking it in right now....it seems that the carb was set way too rich from the factory. im having a hard time getting it to run....it's getting flooded everytime. so if someone out there has these settings for me...it would really help. thanks

Don't worry about factory settings, just lean it out some more. They are supposed to be rich from the factory.

no the crank is black when its new

Take a gigantic Cannon, fill it with 25% Nitro Fuel and turn it on.
Beleive me, You bring some dead people back to life.
Much much more better performance than the old WCR. ( Was owner of the old WCR and now CL7)
You want low power? High Power?Don't think it just press the throttle.

Has anyone heard any info on the Sirio XXX.

Looks like it is really performing at the worlds. Cant wait to get my hands on one , two or three of these.

is that what there calling the new one andrew?

Yeah. I think so. There are pics of it on RedRC.

You dont need it chad. Your motors are quick enough as it is.

The Sirio XXX maybe is an Evo4 Tuned for the Worlds

hey andrew if its there to have i want one, i had a look at it, the crank case looks the goods

Yeah me wants one too...... Cant wait to get my hands on it.

Hows the new track going? Have they laid the ashpalt yet?