The RB Speed .21 engines are essentially a reissue of the RB C6 CC engine which was a very good 7 port engine, it's got plenty of top end and a reasonable bottom end, for the price it's a very good engine.

RB have discontinued the RB Speed though, so you will not be able to get a new piston/liner for this engine any more, rod and bearings are still readily available though as they're used in other engines.

I have an RB Speed 21 NIB I'd like to sale, looking for $150 plus shipping. I'm an off road guy and this is just a paper weight. I won it at off road race (Southern Nats), I have no idea why they gave me an on road engine at an off road race.

You can always fit a Novarossi P/S set. Only the centerpin is on the other side so you have to make a new cut in the upper edge of the sleeve.

Which Novarossi P/S set would fit the RB Speed? they don't make anything like it in their own range of engines as far as I can see?

If it has a 3mm upper edge I think you do need something like a REX 321, or even a 35-plus-21, If it has a 2mm edge something like a Kangaroo, N21-7T etc.

Surely it can't be as simple as just finding a sleeve with the right thickness rim?

Are the exhaust ports lined up with the crank case tunnels properly? is the crank shaft going to be timed right for the ports on that sleeve?

Sounds like a bit of a botch job to me, RB suggested that the RB C9 sleeve would work with the Speed, but once again I had my reservations about it being ideal.

Hi guys , newbie to nitro onroad. I just bought a 2nd hand Serpent 966, and it came with a RB Classico 10 engine. How is this engine by the way, as I cant find much review about this engine.

The engine is no winner but for sure also not a looser. In the hands of an avarage racer it is fast.

The Classico 10 is a great engine, I've raced against people using it when I've had the RB CX in my car which is a better engine, and they've not in any way seemed to lack power.

I don't think it's got the torque and bottom end grunt of the better RB engines but it's for sure a good engine!

Ok noted, thanks both for the reply. Think I will run it first for the time begins, and will get the RB CX engine in future.

The CX is no longer available, you would be looking at getting one of the following, the Ielasi tuned versions are generally finished off where machines can't finish things as well as someone by hand can, improved fuel flow and maybe a shaving of the crank shaft to increase the timing etc.

CXR LS7 Ielasi Tuned
CXR SLS9 Ielasi Tuned
CXR SLS9
CXR SLS DI9

I had an Ielasi for a break in so I did had a closer look to it, it had for sure no extra timing.

Hi guys, just wondering has anyone tried the CXR and TXR Ielasi Tuned engines? How do they fair? And what base are these engines based on? I know they are Nova based, but which engine? Any feedback are welcomed. Thanks!

The closest Novarossi engine would probably be the Novarossi Keep-On going on purely specs alone, but someone with more experience with Novarossi engines could maybe confirm this? I've only experience with RB.

When you refer to timing, are you talking about crankshaft opening and closing or height of ports? Thanks in advance.