Yep, I did not notice your location, makes very good sense now, good luck.

The build-up on top of the piston is fine, it's a good indicator that you have had plenty of lubrication in the engine as the build-up is from the oil in the fuel burning. Some fuel does it more than others as well. I have noticed with Byrons fuel I get more build-up than I did with Nitrotane. The little nicks in the piston are very likely from a plug that broke apart. Sounds like the engine is working good for you so keep running like you have been.

Anyone know that a Nova .21 Conrod will fit a RB .21 ??? I have been looking for a new conrod in the for sale section and a guy wants to sell me a new conrod for a Nova. Will they work?
Thanks Lance

Thank you!

I tried a nova r7 rod in an s5 a while back and i could get it to go on and in although was super tight so i put the original back in(the original was fine to begin with). But according to what i read they are supposed to be one and the same.

It is very possible that it will work but honestly you are better off just going for the RB rod that you know the engine was designed to use. If your having trouble finding one I know A-Main hobbies has them in stock.

Well this old S7 has 12 gallons on it and just wanted to find a real good deal on a rod instead of spending 60$ plus shipping on a rod. I found a Nova rod for 30$ he is going to let me try it before i pay for it!! This has been an excellent motor its the new head on it with a Turbo button, ceramic bearings and just got repinched and the bushing on the rod broke into pieces..

Wow 12 gallons, thats amazing! Original crank? If so I would check the crank pin to make sure it is still round and within tolerance.

12 gallons really isn't that unusual for these engines if they are maintained well. I have 3 engines right now that all have over 10 gallons on them and all still run. The most extreme is a WS7II from the 2006 season, it has 2 full race seasons on it, more than 15 gallons and has had no more than a conrod replaced at the 5 gallon mark. The compression is still good enough that when holding the flywheel the engines own weight will not turn the piston past TDC. With that engine I did pre-heat prior to starting it up EVERY time for the first 2 full gallons of fuel.

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I too agree i have a ws7 2 with i would say 18-20 gallons the crank is still great by digital calipers. A good pinch and she screams and i still never second guess that motor as far as finishing a weekend race. I wish they were not tawain made now not sure i trust a tawain made engine ? Its all how u take care of ur engine clean it after every race run all fuel out at the end of the day Ect.

I don't think RB's are being made in Taiwan, just the Killer 9/ JLR .21

Only the k9 is made in Tawain.

Yep, just like posted above the K9 is the only engine made in Taiwan. The easiest way to tell is by looking at the carb on any of the other engines, they are clearly Novarossi carbs. If you like how that engine runs the WS9 is basically the same engine but it now has a turbo head button, as well as the MES exhaust design that is on the B9/C6 engines. It has a little more power and gets a little better fuel economy.

Anybody have the part numbers for the aluminum venturis?

Great guys
 

Thanks guys to many rumors LOL i well still run rb engines. I heard they where all going to be made there THank god this isnt true because i love my Rb C6 it has the best smooth power to fuel mileage iv had in awhile w/ a 7 mm venturi. I may just get a B9 for a new motor a put the C6 up for backup. Thanks Speedy

01250-9TR8A is the part number for the aluminum 8mm venturi that comes with the K9. The parts list that comes with the K9 has the normal plastic venturis listed as the option venturis that can be used so it seems the only aluminum one they currently have is the one that comes in the K9.

hows the rally9? i never seen till recently...

i have a question (i bought a used rb c5, from a racer that i know) and (it still needs to be, broken in its pretty tight.)im gone to (run 20% nitro there was no glow plug in, the cooling head.) so i have some (nova #5 plugs, will they fit the rb head?) is that the, right plug for that? percentage of nitro.

Fellow RB K9 owners keep a eye on your bearings, I think they are really cheaply made. I ran into some problems last weekend with idle issues. I pulled my flywheel off to find the front rubber bearing seal was prying itself out. I dismantled the engine to also find the bearings felt gummed up and did not spin very freely at all, not gritty just not free. I ordered some Boca Bearing MX ceramic that I will be installing as soon as they arrive. My engine has about 4 gallons on it.

Thanks for the heads up Aaron. Is that pretty normal for most engines?:confused: Alot of people replace the bearings for better ones anyway?:confused: Thanks

No Idea about the Rally9 sorry. I assume it is very similar to the B9 as the specs are basically identical.

The Nova #5 plugs should work just fine in that engine with 20%. Do you know if it is a C5 or a C5BB?? The C5 is older and does not have quite the bottom end power of the C5BB or the C6 or B9. Do you have the box it came with or even the serial number can help determine.

In general 4 gallons for a set of bearings is short for an RB. This is of course with the RB's that are manufactured by Novarossi. The K9 is built and assembled in Taiwan to offer a powerful engine at a great price. IMO in our hobby you generally get what you pay for, while the cheaper Taiwan engines can offer similar performance the quality just isn't quite there.

only thing i really noticed different was the price. looks like a great mill for about $200. at amain it says released over the summer. just seems funny i never notoced nor was there more feedback. almost seems like the $229 tag amain has is a typo

I looked a little closer at the Rally 9 and it looks like it comes with the carb that is on the lower end engines so it's not the really good carb that comes on the B9 or the WS9. The bore and stroke are the same between the B9 and the R9 but they do use different piston/sleeve and a different crank. Most likely the power curve is going to be different and may not be ideal for offroad racing.

Thanks!!:tire:

may be an s5 with a 14mm crank and turbo plug. thanks for the look you took. still like to hear results with it..

Well I don't really think it's like the S5 either. It is a 5+2 booster port engine with the 3 MES exhaust ports so that is very similar to the B9/C6. The crank is also very similar to the B9/C6. I have a feeling the Rally 9's powerband is more similar to the Classico9 onroad engine than the B9/C6. Probably not a very good choice for an offroad buggy or truggy.

In your first post describing i had to toggle to amain and see if it were actually an onroad mill. All interestingly enouph as you say the r9 just aint gonna cut it.

I am looking for a budget italian mill preferably rb. At this point im struggling with possibly just sticking with a picco for truggy

For a budget RB I would say the either the Hobby9 or the K9. Is there a price range you want to stay under?

If the k9 was italion id be sold. not that good motors cant come out taiwan but i just dont see them pushing 10+ gallons. I run an s5 w/ceramics and turbo button now and still strong at 5+gallons although its time to be in the hunt for a good new rb. I guess im trying to stay as close to 200 as possible. Im looking at getting matching reliable investment mills for spring for bug and trug. The s5 is more my spare or buggy mill and then i run a jpx21 in my truggy at 4 gallons so i dont want to way underpower what im use to at the moment. Really leaning towards either this new picco evo or just another jpx and yeah very possibly just grabbing the k9. Iv seen a couple k9's in person and talked with there owners and they were both very pleased.

There is a link on here on the Rally 9 and this guy says it's got plenty of power for even his truggy. http://www.rctech.net/forum/nitro-of...rally-9-a.html

its a rb c5 engine thats what it said on the box,im gone to use it on the my truggy. nevermind i talked to him and he, said it was in a old box. its a s5


the rb box says c5 circuit racer but, i looked on the rb website and it said it had 3 ports? doesnt make sense. and the cooling head, is much bigger on the rb engine that i brought from ,a fellow racer . its a rb head.



the model number on the rb box says 1005-c

might have to dig one

Ok so the 1005-C box is a box for an old C5 on-road engine. The S5 is a pretty good engine, I have never personally ran one in a truggy but I have seen people do it. If you want to find out for sure what it is the serial number on the engine it's self would help. If it is an S5 it's a 5 port engine.

i looked on the side of the engine it says, s5 and he told me he ran it on his hot bodies truggy.

i never had a rb engine, just a novarossi 21bf. does the rb sound diffrent than a nova.


do you know what pipe and, exhaust works good for the s5 ? like a jp2.

Guys what is the factory needle setting for a S7 or WS7? I got mine all out of whack.....

Main needle totaly closed then out 3 1/2 turns
Low needle totaly closed then out 5 turns

What up KAT!!!!!!!!!!!!!!!!!!!!!!!

Just like Kat said it's 3.5 and 5. Before you turn the LSN all the way in to start backing it out be sure you open the throttle up. If you bottom out the LSN with the throttle closed you could actually damage the needle in there.