Brake in Zenoah 26

Egon here on the forum, wrote to Zenoah to ask exactly the right procedure. This is the response:

Its originally posted on a Norwegian forum: http://forum.radiostyrt.no/vb/showthread.php?t=12212

Dear Mr.Finstad
Thank you for your inquiry.
We would like to answer to you as follows.

1)If the carburetor setting is perfect, it is not needed to have
such break in action.

2)However in general, is is not easy to judge that the setting is
perfecvt or not.

So you may had better to have break in running as following step.


A: Carburetor setting is as it is (as our factory setting or L needle
further return by 1/16 to richer side(counterclock direction)

B:To start the engine and keeps approx.4000 rpm at no road(before clutch in
speed).
The running time is approx. 30 minutes.

C:Then run the car at the driving course at throttle less than 3/4 open.
approx. 1-2 tanks.
After the running ,reset the L needle at original position.

D:Set the car at bench(tirers should be free/no load conditions) ,then open
the throttle at full at 5 seconds or less .
Check the max rpm, and set the rpm at 18000-19000 by adjusting H needle.

ATTENTION: do not run the engine more than 5 seconds (at no load full throttle)
to prevent engine failure etc.

E:Check the quick acceleration and slow acceleration,if both are smooth,
all set, so you can enjoy the car driving.

If such accelerations are not good, adjust the L needle to richer or lean side slightly.

Proper breaking is very important, but perfect carburetor setting is also important,
it effects the engine life and keep performance.

F:Another important point is to check all of the car,such as bolt loosen,linkage aafter first
or several car running.

Thank you and best regards

Marketing engineer.
 
Sounds like a bunch of nitro tuners over here now a days lol...Doggy do some more research on this before you break in a 2 stroke either of these ways.Maybe find a good builder and go with there recommendations You should NEVER idle a 2 stroke for a full tank of fuel the amount of ring blow by will greatly increased following the above posts..Its best to break them in fast and hard but there are some guide lines to follow just to be safe..
 
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Yamadude said:
Sounds like a bunch of nitro tuners over here now a days lol...Doggy do some more research on this before you break in a 2 stroke either of these ways.Maybe find a good builder and go with there recommendations You should NEVER idle a 2 stroke for a full tank of fuel the amount of ring blow by will greatly increased following the above posts..Its best to break them in fast and hard but there are some guide lines to follow just to be safe..
Click to expand...

I would agree with you Yam.
I would be scared to run it on the bench with no load for 30 min myself. Use the directions of a builder is the best to go by. Getting it tuned in is about all the break in it needs. You could use this for tuning and about the time you have it perfect it will be broke in.

#1

Zenoah RC-style engines and clones are tuned for high performance and need to be well taken care of. Breaking-in an engine is a process of alternately heating and cooling the engine to allow all parts to properly seat themselves, and allowing 2-stroke oil from the incoming fuel to coat the interior of the engine. DDM recommends the following break-in procedure:
Use 91 octane or higher fuel, mixed 25:1 with a quality non-synthetic 2-stroke oil. (You can use synthetic oil for break-in also. Just run slightly more fuel through the engine. ) Run the engine at varying speeds for periods of 3 to 10 minutes at a time. During this break-in time, NEVER go full throttle. Always let the engine idle for 30 seconds before turning it off. Allow the engine to cool off for 10 minutes before starting it again. Repeat this process 3 or 4 times - 3 or 4 full "heat cycles".
After the break-in period, switch to a high-quality synthetic 2-stroke oil, mixed at 25:1. Be sure to let the engine idle for 30 seconds to cool before stopping. Be sure to follow the maintenance schedule included in your engine owners manual.

#2

Break In
1. You must break the motor in on 3 full tanks
2. Do not go passed 1/2 throttle
3. You should use at least 95 octane
4. The gas oil ratio needs to be 25:1
5. You should run the motor for 15-20 minutes and then let it cool down
5. Let your motor warm up before driving
7. Try to vary the speed as much as possible with out going past 1/2 throttle
8. DO NOT GO FULL THROTTLE UNTIL THE MOTOR IS COMPLETELY BROKEN IN
9. Do not use octane booster, if you can not get 95 octane use the highest octane you can get out of pump

#3 Do this one, Click to enlarge:

 
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on brand new never ran motors, i have a very specific routine i do.


set jets on carb to stock settings, unless i m starting wiht a tuned pipe, then i will make them RICH.

start and let warm up for a few minutes, once im sure its up to operating temps. (a bout 2 or 3 minutes of idle) then i start to drive it like i stole it. that is once im confident my needle setting are rich, but not TOO Rich for it to run well.

Thats it.
when im done with the first tank and i start tank 2, i put a better tune on it, and don't look back from there.

the only thing i don't Do, is run WFO until i ve had about 1/2 tank of fuel burn, then the last 1/2 tank i just don't hole it WFO all day long, thats for tank 2.
 
Different strokes for different folks. Break it in with whatever method your most comfortable with. I personally perform a similar method to the T man as I personally am not comfortable with idling a tank. Reason for this is I read a long time ago how there is a very minute stroke difference between low and high revs due the enormous forces involved at high revs so if you only idled a tank then you have not fully broken in the ring to the cylinder. How much this has any "real world" effect is entirely debatable but it makes sense to me so that’s how I will continue to run in these engines.
 
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