Hi ,
Please take picture of you ignition and place here.

Jan

EVO 58, Bisson muffler, 24 X 10 Menz, breakin oil that was provided with the engine, 82 degrees outside, 6875 rpm. This thing is a mule! I don't care if they are the same or not.

I don't think it means jack either way. Some people will buy them and like them and other people will buy them and not like them. If you've got questions call the factory.

I don't see any "BS", or "problems companys and advertisements usually have". What I see now are three people that have good tach readings from these engines and two that don't, oh and the other three you "heard" about. Kinda sounds to me like you are in the minority now.

Let me see if i've got it right. The Evo is not the Evolution except that some use it when they mean the Evolution even though its not the same engine as the MVVS which the Evolution appears to be even though the MVVS allegedly turns a higher RPM than the Evo which is not the Evolution except when referred to as the Evo (which is made in Spain!) and has nothing to do with either engine. I need a drink!

Phil

Dang, thats really good, in fact you are getting more then an MVVS58 on factory Canister system? IS the engine still breaking in? Pics would be nice...

Jan,

Here is my Evolution ignition.

Well, I got my Evolution 58 back and we had good flying weather so I went and flew. We got 6600 RPM after setting the needle the first time and then later we got 6660. This is with a Mejzlik 23x10 and the engine has less than 2 gallons through it.

Discowings if you are only getting 5600 rpm out of this motor then it is very apperent that the motor is not broken or the needle settings are so out of wack it's not funny. The other possibility is that you have a motor with a soft crank or other possible issues. I would go back to factory settings and start from new. These motors have plenty of ability to pull 6800-6900 with any 24x10 out there. Best wishes and get the needles right and maybe even try a new plug.

A couple of issues have recently come to light regarding the EVO 58 from our service department at Horizon this past week.

1. There are occasional instances where drawing fuel to the carb is very difficult, even with the choke closed. We have discovered that with some of the walbro carbs included with our 58cc engines, the sprung loaded automatic mixture control needle under the vented plate (opposite the pumper side of the carb) will occasionally stick, almost like there is a preservative used in the manufacture of the carb. If you attach a clean piece of fuel tubing to the aluminum 90 degree elbow and blow lightly into this chamber, you will free the sticky needle and you should see fuel readily move through the carb. This usually only needs to be done once.

2. The one common cause of apparent low power output is a hi-side needle setting that is too lean. What we have discovered is that while the base line settings for the high side (1 turn, 10 minutes, or not quite 1-1/4 turn) were correct when we first introduced the engine and published the manual, it does seem that the proper new baseline setting for the high side is 1 turn 45 minutes (or 1-3/4 turn) from closed. This will put both needles at the same spot to start the engine and adjust from there. We are in the process of updating our manuals to correct the error.

The two engines under debate are indeed identical engines, as we at Horizon have been boasting all along. You should easily see numbers in the 64-6600 rpm range with quite a few different aftermarket mufflers. With the cannisters we did indeed test the EVO 58 at 6900 rpm on a Mejzlik 24 X 10 prop. The actual best torque curve for the engine is in the 6100-6400 rpm range, yielding a very flat response. For performance that requires the maximum torque (not necessarily the maximum horsepower) prop your engine for this range and we think you will be astounded by the hovering power available to you. We actually were very happy with a wooden 26 X 8 prop turning in the 6300rpm range on one of our 33% Edge 540's Awesome performance.

If anyone is still having issues such as very low power output after trying the above suggestions, please don't hesitate to contact our service department and/or send in your engine for evaluation. That is what our warranty is out there for. We are ultimately interested in your long term satisfaction with each of our products.

Pete Bergstrom
Category Manager
JR Radios and Engines
Horizon Hobby Inc.

Thanks for the update Pete. I have been VERY pleased with my 58GX. I did richen it from the start and have had no problems. I just switched to 40:1 mix 2 weeks ago and was swinging a 24x10 at about 6500 using a stock BCM pitts. After cutting the rolled tube ends off ... the engine REALLY woke up ... spinning the 24x10 in the high 6700 range.

According to one poster you and I must be mistaken....maybe his expert tuners ran it out the box without opening up the needles. Your numbers are very much the same as mine.
What prop are you using, I have an NX 24/10 on mine

I am running an NX 24x10 also. A friend with a 58GX in a TOC 30% Yak is running a Mejzlik 24x10 and seeing the same numbers.

I just purchased an Evolution 58 and have been having trouble with my engine. The max rpm with a 24-8 prop is 6000, seems like it should be a little more. I have the setting correct too. I have been having other problems and the engine won't idle down and likes to run in reverse. When hand propping about every 4th or 5th start will be reverse. Fuel seems to be dripping from the carb and it is hard to start. I have to crimp the fuel line until it hits to get it running. Anyone else had any trouble like this?? I'm thinking the motor may have low compression for one and a metering adjustment problem allowing fuel to flow too rich while running.

Hi,

You have to start faster. I have 58 ccm with original canister. Engine turns 6000 rpm with 26/10.
What kind of mufler do you have?

Fuel dripping from the carb means the inlet needle is leaking...Starting in reverse means the timing is wrong or the ignition is defective...PERIOD...
People who rely on "factory" needle settings often have carb problems...If you start out with the needles 2 turns open and adjust them correctly the engine will run as it should if the carb is not faulty....

NO engine will be harmed by learning to set your own carb, it will not freeze up or stick if it gets too lean while testing, it will just stop running from lack of fuel...

I agree.....but how about the one manu. that loctites their carb needles on place!!!

Still running the last 1/2 of the break in oil through it. Running rich, 2+ turns out on High end with bisson pitts / cut off tips, turning a NX 24-8 at 6800 rpm's.

Also check the screws that hold the carb mount (the small angled piece between the carb and engine) mine came loose and was sucking air whistled/wheezed a little when it got real loose.

This sounds exactly like the problem I had with my new 58 Pro Sport. I sent it back to MVVS and they said I had the pressure tube connected to the atmospheric vent. I thought, what the *%^$$#? How could it even run with that set-up? Freshly back from MVVS, I fired it up today and it runs superbly - 6500 rpms with a 24X10 Mejlik at a rich setting.

Double check your hose connections, I had fuel dripping out of the carb with the set-up I had before but it would not make it to full power. I fell like an idiot, but this carb simply has too many nipples to chose from! All is good now.. Good luck.

Hey off topic but I have an MVVS 58...I can't find a socket that fits between the recepticle and the spark plug in order to remove the plug...is there a specific tool needed and where would I find it?

Yes there is a spark plug socket that fits that. I bought mine as part of a set of deep sockets at Home Depot. They had a set of spark plug sockets that had the more thin wall on them.
I wish I could provide more details, but I can't as it has been a while. But it might have been this set here http://www.homedepot.com/p/Powerbuil...0855/204505161 or similar. I think that there are several different branded sets of these sockets out there too.