this is what happens when a manufacturer doesn't adhere to its own distribution agreements and starts selling directly to the largest hobby stores directly undercutting their own distributors in their own respective markets... The results are a distributor who was forced to start selling directly creating the price war we see today...short term gain for long term pain...

I am running Byrons 30/11.

I personally had tried it, if just practice, u may get 9 to 11 minutes easily. But race condition, 8-9minutes was what i got. Use 7mm venturi for better top end

try fuel with less oil. It will have more power and more run time. if you have to stick with Byrons get the worlds blend. If you're open to anything switch to Powermaster Pro 30%?

And in the end, the customers win. Can't have that, can we?

We could touch on that little "thing" called Capitalism we have here in the land of freedom. If someone broke a contract, then that is for the courts to follow, not us.

I will continue to enjoy the world of $200 mitos...Of course this happens right AFTER I sell all my nova stuff and go all OS.

First thing is I don't have any skin in this game !

Second thing is I am all for the customer winning !

A question was asked and I answered it...that is all !

So I Will weigh in here even though my advice is going to completely buck the trend of what others are recommending

currently you have your engine quite choked back with both pipe and insert, reducing the engines overall operating efficiency and dramatically educing its potential power both by insert size and pipe/header choice... From that engines full power capacity you are down roughly 35% which in turn results in you using more fuel not less fuel

My crazy sounding advice is to ditch the 41021 manifold, swap to a 41001 and run a 8 mm carb insert ! Even better swap over to a 9886 tuned pipe, the 9901 is a 3 chamber that restricts flow and forces the engine to work harder to breath, the 9886 is a 2 chamber and operates more efficiently... The end result of this is your engine is going to make a whole pile more power and operate much more efficiently , you will clear jumps easier, you will be able to run the track using far less trigger input and most likely end up with better mileage... IMO small carb inserts are not the answer, they end up just choking back the engines power too much and hurting overall operating efficiency more then anything else...

A small carb insert however can be beneficial in some cases on a smaller low speed track where you want to increase throttle low RPM throttle response and will not notice the loss of power and RPM...But on a big track the small insert is going to work against you !

I don't have a whole lot of different options as far as pipe, I have 2 9901's. I do have a 41029 header that I could use if that would work better? It is a decent sized track, I would guess its probably 140'x100'. I just bought a gallon of fuel, but I could probably take it back and swap it for 11% since I haven't opened it yet.

What is my best course of action with these combos? My other option is to put my back up motor in, but I will also need setup info for it also.

Murnan P5 that has about 3 gallons through it.

Thanks.

So what's the best Novarossi/Rex engine available now as far as runtime goes? Nova or Rex just what motor have people seen best mileage with. I personally have seen really good with the Revenge motor and heard the Legend 4 is good also. I know pipes, restrictors, driving style all that stuff plays a huge part but if you lined them all up with identical settings which would get the most runtime you think? Any info helps.

Maximo, thank you for your input!
Did you already try this new manifold 41032?
It looks similar to 41001, plus "conical".

Conical 41032 is shorter than the 41001, more top end with less low end and more fuel consuming.

Try other pipe, 9901 definitely will kill the rpm range, go efra 2072

I was able to accomplish the 8 minute qualifiers with the Keep-Off 21-4. My runs were around 8:00-8:30 plus the half lap to get to the loop to start and I made it back to the pits each time. So I was getting around 9:00 of runtime. The motor ran good, I was able to get a pretty decent tune on it. Made it through the full 30 minute main, pitting every 7:30 and no flameouts.

What is the procedure for checking bearings, and how long do they usually last? This engine now has probably close to 3 gallons through it. I was sorely disappointed in this engine the first couple of gallons and for 6 or so races, but it impressed me yesterday. Maybe I won't make the switch to OS after all.

Anyone running Morgan Sidewinder brand fuels in the Novarossi?

I have always run the Pro 30% with 10% oil and have about a little over 1/3 gallon left before winter that I want to run first few tanks breakin for the Top Elite 8 before winter hits.

I don't see many of the racers run this around here in Ontario although 2 Hobby stores in GTA that are big really stock the Sidewinder well and I have always run it before from 2001 to 2006.

Novarossi are good engines, most ppl cant get it to tune right n complain that it dont make enough power or having flameout issue. For longevity never a doubt. I personally start running Novarossi since the price become affordable lately