Jaketab

My Feedback: (2)

Recently, I have increased the Seafoam content in the gas/oil mixture from 1 to 2 ounces per gallon in my Moki 250. The reason for the increase. At the beginning of each flying session I inject an ounce or so of Seaform into the fuel tank and run the engine just enough to clean things out. Right from the start I noticed that most of the mid-range has smoothed out considerably and - #3 cylinder comes up to temp with the other cylinders much quicker. The engine just runs smoother overall. Another benefit is that it has eliminated the sticking of the #4 exhaust valve. I certainly can't tell you why it works, but can only guess that the added Seafoam helps to aerate and stabilize the mixture and oversaturation going to #3 cylinder. I would be interested to know if others have tried this and experienced the same result ????

On another note - Motul motorcycle chain lube for the rockers. It was recommended for my Valach 210 4 stroke. I am very pleased with the results. It seems to stay on the rocker train better and lasts longer between lubes.

Regards - Jaketab

Maxam

My Feedback: (62)

Yes jaketab, I have found great benefits with 1 oz/ gallon Seafoam as well as Redline oil. The Seafoam keeps the pistons, plugs and valves cleaner along with the excellent qualities of Redline oil. Stuck valves? Not in years. This early summer my newest 215 has fully broken in after around 100 flights (!) to the point where the compression is perfect on all cylinders and the engine runs cooler than ever. After a flight I can touch the cylinders nearly right away. Starts are a breeze. -Tom
Phillips 66 premium is the gas I use.

Maxam

My Feedback: (62)

Jtab, I did not read your post carefully. I have read where gasoline now goes bad in a tank within a month. This has to be an exaggeration, however, the first run of my Moki's after a couple of weeks is commonly lean on the first run and then fine the rest of the day. There is a "gelling" of the gas in the filter that clears out fairly quickly. Perhaps the extra Seafoam clears this out quicker. That ounce you add might clean out the offending cylinder plug some so you get better running. -Tom

marksp

My Feedback: (9)

Questions on the Rainbow-tronic (S250) setup - one of the listed features is rev limiter of particular interest for those with variable pitch props. Is the RPM limit pre-set? If so, at what RPM? If variable, is it infinitely variable or pre-determined steps? How do you change the max RPM? Is there an online manual?

I currently have an original top hat on 5.5v Sparkswitch that I'm thinking of upgrading to either blue box or Rainbow-tronic

Thanks

Jaketab

My Feedback: (2)

Tom,
Yes, your explanation may have hit the nail squarely. One thing I did notice on the Seafoam instructions is they recommend up to 2 ounces per gallon for 2 stroke engines and not to be used as a substitute for the oil mix. BTW - I just switched to Amsoil Dominator because that is what my Valach calls for only at a richer mix. Will try it for the first time next week.
Regards - J Tab

adec4

g'day gents

i am the proud owner of a MOKI 250 7 cyl radial and soon to be the proud owner of a 300 cc 5 cyl for my jerry bates 1/4 scale seafury ( coz im greedy ) SO im hoping one of you can tell me the correct order to adjust my valves ...
ive had 22 flights on my engine now faultlessly so i think its time for a tune up

any help would be great


heres a video of my stearman and engine

thanks gents
vince

adec4

g'day gents

i am the proud owner of a MOKI 250 7 cyl radial and soon to be the proud owner of a 300 cc 5 cyl for my jerry bates 1/4 scale seafury ( coz im greedy ) SO im hoping one of you can tell me the correct order to adjust my valves ...
ive had 22 flights on my engine now faultlessly so i think its time for a tune up

any help would be great


heres a video of my stearman and engine

thanks gents
vince

IFLYBVM2

My Feedback: (360)

Nice Vince-VERY nice...
FYI..I have a NIB Moki 257 for sale at a great savings versus current cost if you know of anyone interested. Call or text me at 843.833.0059, or PM me.
Mike O.

Greg Wright

My Feedback: (6)

Hey Mike O,

How much are you looking to get for the Moki 250 7Cylinder?

IFLYBVM2

My Feedback: (360)

Text sent-Thanks Greg
Moki

GeorgiaFlyer

Vince,
Great video, very nice looking plane. Have a BUSA Stearman as well. Love the plane. Question for you, the silver cowl section between the firewall and the back of the motor, where did you get that piece from? Also where did you get the air intake scoop?

IFLYBVM2

My Feedback: (360)

Hi Maxam-
Sent you a PM.
Cheers-Mike

adec4

hiya georgisflyer

i got the front engine cowling from performance specialties over your part of the world ...

the silver cowling that you see was added on to the fiberglass cowling , i used a foam glued to the outter ring then carved sanded and severly coughed through it all to make
the outter ring then fiberglassed over it and took the foam out after it dried so the moki had the effect of being set back into the fuse
the fire wall as shown in the plan was put in the exact place shown and i cut a large hole for the engine back plate to sit further back into the new ring and i made an engine mount
out of 3mm alloy plate so moving the engine back ,, the exhaust ring was about 15mm of the fire wall [img]"C:\Users\user\Desktop\mobile pics\2015-12-23\450.jpg"[/img][img]"C:\Users\user\Desktop\mobile pics\2015-12-23\450.jpg"[/img]

the silver ring you see is painted with 2k paint

ive tried attaching pics but im buggered if i can make it work


hope this helps you

regards vince [img]jpeg282[/img][img]C:\Users\user\Desktop\mobile pics\2015-12-23[/img]

muzzgail

What brushless speed controller are people using on their electric starter 250's. Instructions call for a hard start speedy.

GeorgiaFlyer

Vince,
Thanks for the info. The pictures would be great if you can get them to upload.

midastouch_73

My Feedback: (27)

Can anyone show me how to wire the ignition box? I have the blue ignition box which did not com with a plug. I'm located the green plug but I will need to solder the positive (+) and negative (-) leads onto it. I don't want to cross the wiring on it and fry something....

IFLYBVM2

My Feedback: (360)

Are the Moki 215 and 250 identical in external dimensions, to include exhaust locations ?
Thanks-
Mike O.

GeorgiaFlyer

See the pictures I uploaded.

midastouch_73

My Feedback: (27)

AWESOME!!!! Thank you

Greg Wright

My Feedback: (6)

Yes they are the same diameter Mike. They used the same motor to update from the 215 to the 250..

affas

Bought a new Moki 180 and I was not able to get it running good. The engine was sent back to Airworld, changed some coils and came back again. It did start but I was never able to get it running good as teh sparks was very weak. Bougt a new ignition with pickupsystem from Adrian at www.ch-ognitions.com and the engine now runs so smooth. The old system have to de removed but I wanted to test the new before removing the old one.
The engine was warm and just shows how good it runs now even without pump. Will also install the EMcotec pump I have on my Moki 215/250 and they even runs better then. Just easier to tune good.

The propeller is a little to big but even three bladed 28x10 runs quite good.

https://www.youtube.com/watch?v=PX9C...ature=youtu.be

Jaketab

My Feedback: (2)

APS Powerfuel Pump Question,
Just acquired my 2nd Moki, a used 250 with the APS 380 pump. The top return inlet line valve does not accept return fuel. So like my older pump, I just looped the return back to the gas tank and plugged the top inlet.
Anyone else noticed this on the APS Powerfuel 380? Is the top return optional if as long is the fuel is recirculated to the tank.

Thanks - J Tab

GeorgiaFlyer

From what I can tell from your picture, I believe that would work, though not ideal. I would think best to have a three line tank and have the third line from the pump return direct to the tank. But like I said, looks like your picture setup would work though I am not sure it would build the proper pressure on the carb if its constantly pumping back to the tank on the same line. You are losing some of the advantage of using an electric pump.

Howie-RCU

150 cam timing.
Does anyone know the correct timing for an old 150? There is a drill mark next to one of the magnets visible through the ignition sensor port. Does this mark need to be in the center at #1 TDC or the magnet next to it?

frankyy54

In your configuration you will not have the specified fuel pressure of 0.3 bar in the fuel line. So, the pump is useless. Did you disconnect the original pressure tube for the internal walbro pump? I assume, you have not. Otherwise the Moki would not run and now it is pumping by himself without the help of the APS pump.
When you disconnect the original pressure tube and connect the APS pump correctly (as in Manua describedl) to the carburetor and if the Mokis is still not running, the spring of the Walbro pump is too strong. The APS pump needs the 0.3 bar to press open the Walbro pump membrane.

regards
Franky