Was trying to look for a p/s set without rod. If I can't find that I'll just put my RB back on the shelf. I was just going to dust it off to see if it has a smoother power band than my Werks engine.

Sounds like you have a new conrod if you dont you may need one so i would buy the new P/S/R . If you are looking for a cheap way i would send your old p/s/r off to rayaracing.com it well be about 90% brand new but may need a new rod. Hope this helps im sure the ws7 is smoother than the werks. Speedyrob

What is the difference between the c6 t7 and the c6 usa edition???

There are two things, first is the the crank shaft. The C6USA has a ballanced modified crank that has a hard coated pin. The Turbo button on the C6USA is also modified and has what looks like a turbo cut in it that faces the exhaust port. The USA has quite a bit more power but does not get quite the fuel mileage of a regular C6.

I'm having a time trying to get the tune on my S5 just right. I know it's hard to help tune over the net, but any help is appreciated. I can normally tune most any engine great, I just can't get a handle on this one.

Top end seems great, and I can get it to idle good. But when I'm running on the track, the bottom end just seems like it's not there. It's not very peppy. I can get a video of it if it will help

Can a bad bearing cause this? Even if it runs great everywhere else? I'm not having problems with temps, it's just that low speed problem.

To anyone running the S5, where are you needles at now from fully closed?

I would try leaning your bottom end a little more. What is your engine doing when you come off a full speed pass. What pipe are you running? I have a backup souped up S5 with turbo button and WS7 crank that I run with a Dynamite 007. It is nasty!

I went from a JP2 to the RB 2020 and it helped the bottom. I tend to run the bottom a bit fat, it seems to lean out after its heat saturated.

I'm running a O.S. 2050 on it right now. I have noticed that too kat.

When I make a wide open throttle pass, it takes a minute before it comes down to the actual idle. when I gun it afterwards, its like it hesitates, then it goes great.

When it hesitates it's not bogging, or cutting out, just sounds real flat and doesn't have the bottom I think it should have.

My cousin has a WS7 and I can tune his with my eyes closed.

The S5 will seem a little slow on the bottom if it's lean or rich on the LSN. The best way to know what the engine needs is to recognize when the bottom end seems soft. Does it start out with good snappy bottom end then lose the snap as you run longer? If so that means your LSN is too lean. If you never seem to have good response from the bottom end then you are probably too rich on the LSN. Remember that when you lean the LSN you will need to lower the idle, and if you richen up the LSN you will need to raise the idle.

Thanks Chris. On the box the LSN seems fine, it's when I put it on the ground to take it around the track it seems to lose power. I'm running an Odonnell 99 in it now, with the 2050.

I think I may have had the idle a little high as well. I just lowered it and I'll give it a shot tomorrow.

Also checking for leaks, the front bearing seemed to leak a little more than I'm used to seeing. I'll work with it tomorrow, and if I can't get it I'll order a bearing and see if that helps it

The front bearing on the S5's only have one rubber seal so they will leak a little more fuel especially if your still runnin rich. If you can find other pipes try them if you can, I have never had any luck with JP or OS pipes on RB's. Another thing to try if you have the option is maybe 1 tooth bigger on your spur gear, you won't even notice much of a difference in top speed.

I normally use a McCoy 59, you may want to try one or a Odonnell 77. If you can find a RB 2020 or a RB 3002 pipe to try I think you'll like how it "feels".

anybody know rear bearing size for a RB S9?

13 X 25 RB part #01150-13s

Update on the Shark 9 guys this things coming ALIVE not leaning on it much. Im still using a 1/10 faom to keep it around 210-215F it been leaning itself out alot. Im about a quart away from a gallon trying to get some fuel thru it before my points race on march 27th. I have been using the compitition heat to help preheat before start. It feels like its going to have something for my C6 i have my motor for my 2010 points series. Ill keep everyone posted about how everything goes. Great motor as aways from RB. Running byrons 30% nitro 11% oil .40 shims Thanks Speedyrob