voodoopapa

iTrader: (4)

What are the best plugs to use in the Sirio S21 CL3B? I think this motor comes with the standard head.

Davidka

iTrader: (86)

O'Donnell OD99, McCoy MC-8 (med) or MC-9 (cold). These all work pretty well on 30% fuel.

wingracer

iTrader: (24)

If it's standard, the above recommendations are great. If it's a turbo, Sirio 5 or 6. Sirio turbo plugs are fantastic.

Davidka

iTrader: (86)

Looky looky what I saw in the for sale section! For this price, buy 10, these will run you $6+ each in stores.

http://www.rctech.net/forum/r-c-item...med-odo99.html

SteveP

I would suggest you get a turbo head button from a CL7B. You'll see a big difference in engine performance and economy.It just runs better with a turbo plug.

deeje929

P4, OD97T

JUD

iTrader: (4)

You want the Sirio standard plug #6. Its a medium plug. #5 is hot. #7 is cold.

JUD

iTrader: (4)

The turbo head button does not fit. It a mm or two too big.

wingracer

iTrader: (24)

The .21 button should fit. The .24's and .28's are bigger. But then I haven't tried so I could be wrong.

JUD

iTrader: (4)

I tried it. It doesn't fit. For Whatever reason

bphil49

iTrader: (28)

Do you guys know what carb restrictors fit these? I have a EVO 4 but I think all the carbs are the same.

JUD

iTrader: (4)

Not sure. Why a restrictor?

v6shooter

werks carb restrictors work on any sirio based engines

bphil49

iTrader: (28)

Thanks

v6shooter

How do u like your evo 4 and what pipe do u run with it. I have a evo 4 sti and a 2013 and I love it.Best motor I have ever ran so far.