Thanks for the update chadster....

I havent got a XXX yet. Ive been waiting for ver2 to come out.

Not that in a hurry at the moment. I have a couple of Evo4 club motors that will keep me going for a while.

Hope to get the XXX for the QLD titles though.

sleeve/Piston for Sirio s21s or S21r
 

Anyone know where I can get a replacement sleve/piston for an old s21r or s21s, from what I can tell these are both the same engine, one aimed at on-road the other for off-road.

I've acquired one cheaply and has very little compression, and turns over way to eaisly, suspect it has many miles under it's belt.

Cheers

Francois

shims for 25%
 

hi guys,
my .12 STI4 got stock of 0.3mm of shims; so i presume it's for 16%?

how much shims should it have to use 25%?

Need help for my Sirio EVO3.

I have problem keep running engine after I unplug glow plus ignition. After I unplug it, engine just stop running. Can anyone help with this? I am running 16% nitro and 15% oil fuel. Thanks

check yr plug 1st...make sure it's ok else just try new plug.
you're using sirio S6 plug?

Yes, I changed plugs. I have used Turbo Plug no. 6 and 7. Finally it runs with No. 6, but it does not stay idle. When turn to idle, engine just do not like it. Then wind down and stop. So, I got no idea how this happen.

for 16%nitro, s6 plug better.
check yr throttle linkages, make sure it's not closing the idle gap when u release throttle or braking.

if not set a bigger idle gap so that it can idle and retune from there...
:nod:

I think 15% oil is also a bit to much....

if it idles with the glow warmer on and stops when you take it off , it is to rich on the bottom end , if its very rich on the bottom it causes it to stop due to way to much fuel

I adjusted low speed needle to lean it, but the same thing happen. Any other things cause this problem?

idle
 

Turn the idle screw in . To set the lowspeed rev it a few seconds and when it comes to idle if it drops rpm lean the lowspeed. If after reving a few seconds the rpm comes up at idle it's to lean. Make sure the gap on the slide is not too small or it will be impossible to get right. Hope this helps.

lots of causes, how used is it?

Finally, I got it run. I set idle first and then adjust low speed needle. Thanks for everyone's help.

rich but high temp? (.12 Evo4 STI)
 

hi guys,
is it possible for the engine to run hot (about 280-290F) but still rich (piston and button head still shiny wet)? engine power seems ok but not that REALLY fast yet...
air temp about 80F and humidity about 70%...

what could cause the above scenario?
i've checked my clutch and it's not slipping and my car's transmission seems ok, no binding...

This is what ive been waiting for..... Article from Red RC. :D

Sirio have sent us the first picture of their latest .12 engine called the XXX V. The latest evolution of their successful XXX engine, it features an updated crankcase with better strength, providing you the best performance, durability and fuel economy. Ceramic bearings and careful construction further ensure a reliable and powerful motor. Available from Monday July 6th.