I = IFMAR
E = EFRA

but both are labaled as T3 which i suppose they mean that they are 3 ports.

ok they have any difference in HP ?

What, I get one and you have to get one? Actually I don't even have mine yet.

That is a very good deal. I shouldn't be surprised...

What are you going to use for a pipe? I tried to get the Sirio pipe but it's on backorder. I'm sure you can find one.

This is what the internals look like. It's a portuguese site but the pictures speak for themselves.

http://www.poleposition-pt.com/produ...oria=166&sub=1

Dave

Oh, and one thing I suggest you do is take it apart before you run it and clean everything up. I remember my crankcase being a little dirty along the ports. Then put it all back together and lube it up with after run.

Dave

The pictures of the sleeve and crank on the Kyosho America site are from one of their .21 motors. The STI just has the bottom of the sleeve cut down for faster fuel flow.

Wow...you did good Rainer....hey just take your time with the break in and this motor will give hours and hours of fun with no hassles.....Its very easy to tune.....you should have no probs any questions regarding shimming, head clearance, % nitro , plugs ,etc. dont hesistate to ask.....

Thanks Robert.

There should be, but I've never seen a dyno comparison between IFMAR and EFRA engines so, I have no idea what the difference could possibly be. Maybe someone in the know could shed more light on this.

The IFMAR version is preferable to the EFRA. The crankshaft pictured in the photo from dollaracer is the EFRA version. That is why it has the silver shim in the rear of the crankshaft. This makes it conform to the 7mm exit hole in the crankshaft. The IFMAR looks the same, but does not have the restrictor in the crankshaft. I have not done a dyno comparison, but the non restricted crank will be faster, but drink more fuel. I also agree with dollaracer when he says to take the engine apart and clean it. I have found metal shavings, and hardcoating that seems to be easily removed just by cleaning the crankshaft. Just take the crankshaft out and wipe it down with some denatured alcohol and you will see the cloth turn black.

RMDHawaii, you got really lucky on that STI.

Thanks for the info Grinder - and yes, I was very lucky.

There is also,
http://www.kyoshoamerica.com/sirio/

yes this is true but we cant even get the E here i wonder what is the diff, in speed is the E slower or just different so its efra spec. id like to know for my next sirio buy cuz i realy like sirios yes i know i blowed up 2 but i like the speed so very fast.

I'm just curios Walley.....Why is it every time you post on this thread you explain how you love the Sirio but then add how you blew them up ......What I find interesting is you stated on a previous post that you know why you blew up the motors, But why don't you add that to the post so we can all learn from your mistake..I have already lost count as to how many times you have posted the same thing regarding the motor. It would just be great to see something a little more creative or could we say informative regarding your experiences because we all know by know that you did have a malfunction.