If the cooling heads look the same and it's just different engraving on the top... my guess is yours actually says MSC with a big S over the M and C. The MSC stands for Massive Stiff Case... This is when they moved to the 14x25.8 main bearing from the 25.4 main.

The T7 is the follow-up to the C6 MSC. The T stands for Turbo and it is the first offroad C6 to come with a Turbo plug from the factory. If yours uses standard plugs thats a dead giveaway, but it's possible yours was upgraded to a turbo plug after someone purchased it as well.

They are essentially the same engine, the standard plug will be a bit easier to tune, but will have slightly less power.

Hey guys what pipe works best with the ws7/2? Thanks

RB2045/192 RB Header

Thank you chris, now looking at the head I see it, It was hard to make it out but now I see it. And yes the guy who gave it to me had both buttons for it and told me it came with the stander plug button. But he said when I want to kick some butt with it to put the turbo button in it. you know even at just 5 gal. on this engine and with the turbo plug in it I still get about over 10 minuts to a tank and there are still not a lot of engines keeping up with this one. I'm not just saying that cuz....I own Toro nero's that just maybe have a little more on the bottom. but thats a new engine and the C6 keeps up with it. thanks again....

Just a FYI to all you RB fans...

we are clearing out all RB engine below cost.. get them while we have them in stock... thanks

Thanks for the response . Will a jp3 work on the ws7/2? Thats what the hobby shop has in stock.

So are you not going to sell RB anymore then?

How long will they on sale for? Till gone?

I just bought a sportwerks mayhem with a RB S5 in it. It has a jp2 pipe and the thing is pretty damn quick. Who has replacement parts for this motor though? I cant seem to find any. I love it and Ive only drove it once!

Absolute hobbyz is the bomb. Ordered at 2045 pipe and header last night around 1. I guess that would be this morning but at 10 this morning I got an email that said it has already shipped. Now that's fast.

I think they are just clearing old stock for the new years models.

I just bought a WS7 III off a guy on here.so when i out a flywheel on it and turned it i noticed slack in it,so i pulled the backing plate and noticed the rod was loose,this motor still has a metal pinch,so i ordered a new rod,but it didn't fix it.so i guess it needs a crank.do these motors have crank problems.this motor is a CEO MOD

I will have my new Killer 10 and 2045 pipe in tomorrow to run at the Georgia Championship Series this weekend. It will be my first race with an RB. Ill let everyone know how it goes and what mileage it gets. For the money its hard to beat!

I bet what you are feeling is some slop at the very top of the stroke when the piston gets stuck. This is normal that it will feel like there is slop. The WS7 has a coating on the crank pin, while it's not a DLC coating I have never worn out a WS7 crank, and I have several with close to 20 gallons of fuel on them. If you don't have calipers to measure the crank pin just pull it out and check the play it has on the rod when out of the engine. If you have calipers the crankpin should measure 5.02mm new, what you are looking for is some egg shaping to the crank so if part of it is 4.98 and part is 5.02 your crankpin is shot.

Are these engines any good? Pros/cons thanks for any help.