I have ran the X2 for a full year now and its a GREAT motor with a TON of power and its all so good on fuel i get about 8-9 min on a Big out door track.

The Pro to the X2 its a Smooth motor makes GREAT Power.
The Con to the X2 is its a Little Soft on the bottom end i like a little more punch on the bottom.

The Pro to the Cobra 25 its a MONSTER TON of power.
The Con to the Cobra 25 its not as good on fuel as the .21 motors.

I have sold the X2 and the Cobra .25 to guys and most guys running Truggy Like the Cobra .25 better. You can get a Fuel Mod done to the Cobra .25 and it will get all most as good of fuel time as the Cobra .21 and has MONSTER POWER.

:D I hope i have helped and if you would like a price on a X2 are Cobra .25 just send me a PM and i will send you a price on the X2 and the Cobra .25 THANKS.

I am getting my first engine. I am looking at the Mamba X1 Evolution Competition Off-Road Engine w/EFRA 2050 Tuned Pipe from Amain.

I see that the throttle arm is on the opposite direction compared to my RTR engine. Is it possible to rotate the carb? How is the carb fixed on the case?

If not how to modify throttle linkage?

I see the carb has a metal body. What are the advantages or disadvantages of a metal body compared to a plastic body like in some Novarossi?

Yes you can Rotate the Carb. I am a dealer for Axe Rossi i am all so a Sponsored driver for Axe Rossi and can make you a better deal on a Motor & Pipe then you can get from Amaine.

The Carb has a Plastic Sleeve that goes between the Carb and the Motor to keep it from Heat Soaking and helps it seal off better.

Just read back a couple of Pages and you can see wear i helped a guy get a motor sent back to Axe Rossi to have Warranty work done to it if you get one from Amain and something goes wrong with it i am suer you will not get that kind of help from them.

If you would like a Price just send me a PM and i will get you a Price for Motor & Pipe.

Sent PM to all you guys Looking for Price on Axe Rossi Motors. THANKS

Look on Pages 3-7 and you can see some Work Mark Of Power House Did on a .25 Cobra. He dose GREAT work and Makes the .25 a MONSTER with Smooth Power and GREAT run time.

what's the power gain?
 

Powerhouse,
What's the gain and how does it work when you blade the crank?

You will need to get on the Power House Thread and Ask Mark what Blading the Crank dose i am not sure all i know is i have a Axe Rossi Cobra that has been Modded and it was Crazy Fast and got good run time.

Most of the time i don't Mod motors but i had to try one and see how it was and i like the work Mark dose and this motor ran GREAT after the Mod so give Mark Try.

The gains from the bladed crank are faster spool up, higher peak rpm amd hp and better run times. The full race porting adds all of those elements over stock engines but the bladed crank takes it up a couple notches. Think of it as an internal super charger. It adds additional case pressure to aid in charge pack and delivery. I also helps to keep the incoming charge from deatomizing and puddling in the bottom of the case. The bladed cranked engines tend to get an increase in runtime over the race ported engines because of its function and efficiency. Most people find that the turbo cranks run at a leaner setting than they are used to because of the efficiency of the engine. I have had Picco and Novarossi .28's that were getting 5-7 min stock on a good day to getting 9-11 minutes confortably with more power and rpm across the entire powerband.

An engine that is timed, piped and tuned correctly has the ability to make more usuable horsepower across the board while getting a noticable gain in runtime because if the engine can scavage better, it runs cooler, tunes easier and wastes alot less fuel. Engines that are using too short of a pipe will have to be run alot richer due to the pulse returning too soon and pushing the fresh charge back down into the case so naturally the engine needs alot more fuel in the mixture to compensate for the expelled gases being reintroduced back into the cylinder. Those returning gases bring heat which raises the internal chamber temp which in turn raises overall running temp and the only way to control that is by richening up the mixture which results in reduced performance all around and wasted fuel. A pipe that is too does the opposite but requires the same adjustments which will give similar results.

The pulse in a pipe that is too long takes too long to return to create that invisible barrier at the exhaust port to hold the charge in the chamber until the port seals creating a lean condition. The incoming charge short circuits and exits the exhaust port with little to no resistance and when the pulse finally does arrive at the ports opening, some of the fresh charge burns in the pipe creating additional heat which in turn becomes an increase in running temps and once again, a richer mixture is needed to control temps and again the engine loses performance and efficiency.

There has been alot of debate if whether or not what I do with the crank actually works and I can confirm it does work and works well. The only real drawback to it all is because of the added case pressure, comes added fuel signal which will make the engine more needle sensative and depending on how well the overall carb and engine design will determine how the engine reacts. I have had engine from name brands that tuned easy and held a great tune most of its life and I have had cheap bottom feeder engines that were a nightmare from start to finish but those same engines were nightmares in stock trim as well so it goes without saying.

The turbo crank mod package is something I recommend to people who are drag racing or speed running. I have run turbo cranks in my offroad setups but most of the time they are overkill. The full race packages I offer are definately a great way to go as they offer an nice overall increase in power and runtime while keeping a nice linear feel and good tunability.

THANKS Mark that should help some of the guys asking me about Mod work on Axe Rossi motors. All i know is Mark takes an Axe Rossi that runs great and has a Ton of power and makes it even better.

hey chris i was reading and i heard that the cobra was a fantastic motor and my lhs had it in stock so i bought one i was just curious on the best way to break it in

Just as it says in the Paper work that comes with the Motor.

Kyosho17 www.kcengines.com
and I offer a Motor Brake in for New guys are guys that just don't have time PM me and i will get you a Price for the brake in if you would like use to do it. THANKS

What plug do you use ?
In my view OS P3 give more bottom and stability regulations but you loose end power

I run cold plugs in my cobra x2, mamba they run very well and have consist run times this also depends on wher u live and the humidity levels hope this helps

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