frdeluca1

I have (2) 46AX's as well as a 61 FX and a 25FX. All run well. The 61and the 25, besides running great, usually start with one flip after priming.

The 46 AX's are a different story. After priming, both engines kick back a few times, loosening the prop nut. A few more flips and they run backward. I then flip backward and usually get them to go the right direction after a few tries.

Both 46 AX's idle great, solid transition and fine at high speed and everything in between. No big deal, but I am wondering if anybody else experienced this problem with the AX and if so how did they fix the problem. Again , I always get the engines running, but I would like to make it less of a chore. I don't use an electric starter for any of my engines.

Kostas1

Maybe you are ruuning them very very lean?
Maybe?[sm=confused.gif]

frdeluca1

Thanks for the input. That was my thought also, so I rechecked the setting by *****g out the rpm and then richening about 300 RPM.

No change. Again these engines run great once they start.

CARTERrc

G'day
in regards to the AX try richening your low speed a minute amount this will help stop the backfire. I had this problem so I richened up the bottom end a smidgen and works fine now.

frdeluca1

Thanks for the input. Although it idles great right now, richening the idle mixture is worth a try as I would rather have to turn up the idle speed a bit if necessary and make starting easier. My only concern is the transition from low to high.

Thanks again.

CARTERrc

G'day
I understand where you are coming from with the transition from idle to full. Give the idle a tweak and sea how it goes and if it works fine keep it there if not I'm stuck for Ideas, although where is you fuel tank in relation to the carb?

frdeluca1

Now there is a thought! I am flying one on a Skyraider II with the stock tank in the stock location, but the location of the fuel pickup line is my own choice. In other words I could locate the pickup line lower or higher. There is a place to start.

Thanks

Chopper9

My Feedback: (6)

Does anyone have any idea how to get the main crankshat bearing out of a 160FX. I have heard cooking the crankcase in the over for a while may work. If true how long and how hot "Chopper"

BOLTMAN

My Feedback: (1)

Chopper

Get your oven really hot ( 300 degrees C ), make sure it has had plenty of time to warm up. The idea of getting the oven hot is you want the crankcase to heat up quickly. The aluminium crankcase will expand alot quicker than the steel bearing. Put your crankcase in for about 5 minutes, remove the cankcase & gentley tap it on a piece of timber. If the crankcase is hot enough the bearing will just pop out. I have had the bearing just drop out while the crankcase is in the oven if the motor is sitting with the rear bearing down. Make sure you have the new bearing on hand to stick straight in while the crankcase is still hot.

Good luck

Roary m

My Feedback: (67)

I use a heat gun to loosen up the case, works well.

dr looby

I have recently purchased a plane (used and only partially completed). It has an os .91 with what I assume is call a mixture control as well as the normal throttle control. Anybody know how the mixture control is operated etc.?

TimC

dr looby, O.S. makes both a four and two stroke .91. Which engine do you have? Both engines have a low and high speed mixture adjustment.

NM2K

My Feedback: (14)

--------------


Me too. Just be sure to wear some gloves when you go to pick it up! Don't ask. <G>

loughbd

Wow, an OS users Club.

Here are a few of my OS engines. These are in boxes. I didn't dig out the non boxed engines.

Edited by moderator!

NM2K

My Feedback: (14)

I'll never feel guilty about my engine collection again! <G>

You have good taste, Bruce. Nice collection.

loughbd

300 degrees centigrade is way to hot. That's 575 degrees F. You will ruin the case at that temp. Set your oven for 350 F . Put the engine in cold and when the light goes out you bearing should be out. If not rap it once on a piece of wood.


This post is answering Chopper9 back up the way added by moderator

loughbd

actually it was answering sportstar1

Rate1

loughbd

Wich one of all your OS Engines is the favorite?

loughbd

Actually it depends on what I use it for and many other things. I really don't have a favorite per se. For sound, there is nothing like the 240 pegasus running at 7500 rpm or the 300 twin on Harris ignition idling at 1100rpm. I love the very first OS60FS that I bought in 1976. The first version with the machined rockers. Love watching it run at an idle and seeing the rockers doing their thing.

For boats the 46VR-M ABC was my favorite. It would idle where most boat engines don't with instant acceleration.

I used an OS45FSR ABC on a Kougar for years. Great all around sport engine. Powerful, easy to set, and ran like a dream. Still does. At least 50 hours on it. But I like all the FSR's as a sport engine. I own more of them than any other series except the four cycles. The only draw back on them was the muffler attachment. If you knocked the muffler off the 40,45,or 60 and 61 you took a chuck of the crankcase with it. Of course the answer to that was don't crash.

The wankel is neat because it's different. Sounds sort of like a vacuum cleaner when it's running. Really turns a 9x6 prop. very limited in use though. Just running somethat different is fun. Would be great in a four engined airplane like a B-17 but expensive. I only have two so maybe a B-25. Of course I'll never build one.

Then there is the old K-6 replica of one of OS' first ignition engines. I ran one and saved a NIB one for the black hole of hobbydom. Neat running engine. I keep meaning to use it in an airplane but it's like the B-25 and probably will never happen.

Right now I'm only using three OS engines. An FS26 in a little QB-20L, A 45FSR in a Kougar, and an OS61FSR in a Old Kaos. Wait I have a couple in some C/L airplanes I fly occasionally. A 35S and a 40FSR-S. They have mufflers and don't irritate the neighbors like the old old unmuffled Johnsons I use. I have a 46FX in a 40 Kaos but no radio in the plane. No it hasn't peeled.

I'm running several Saitos right now and they are a tossup against the OS. I like them both in four cycles.

Anyway I don't really have one engine that stands out as a favorite over all the others but overall, I would say OS is one of my favorite manufacturers.

Rate1

loughbd
Thanks for that

gcv_824

greetings! just joining the list of OS engine users..... my list is by year that it came out....

1. 1961 15 III
2. 1962 19 r/c marine
3. 1963 35 s
4. 1963 50 r/c
5. 1964 10 r/c
6. 1964 h35c
7. 1967 h60f r/c 4pcs.
8. 1975 40 fsr 3pcs.
9. 1979 45 fsr-h
10. 1987 32 f-h ring

by the way, its my dad who used all this engines and i am sure he is one of the loyalist to the brand. thank you. george v.

TimC

dr looby, the high speed needle on the .91FX is mounted remote at the back of the engine. The low speed needle is the screw head inside the boss opposite the throttle arm where the servo linkage connects. You can download a manual from the O.S. web site. It will cover the adjustment of both needles. There are lots of .91 owners reading this thread so help is close at hand. I have a .91FX and it's a fine engine. What kind of a plane did you buy?
The manual can be down loaded at this link; scroll down to .91FX-HGL: [link=http://www.osengines.com/manuals/index.html].91 Manual[/link]
Dang gcv_824, if you don't buy some new O.S. engines, they are going to go out of business.

gcv_824

sorry, i did not elaborate more. the list i showed are the only ones that is with me right now. the newer o.s. , .40 .61 .91 and .120 are all with my brother in canada especially the new four strokes .91 and .120 . he inherited about ten pieces or more when my father went up there high above. i am sure he is using it right now cause he is also an avid airplane buff. thanks and more power to all.

Safebet

My Feedback: (12)

Hi O.S. users:

I am getting ready to break in my first O.S., a .61 FX. What prop should I use for break-in? I was told to use one that does not exert a lot of load
during the first 2 or 3 tanks. I will be bench breaking it in. How many taks should I run thru it, on the bench?

You suggestions would really be very helpful. I am new to O.S. and have never broken in a engine.

TimC

Jim, the manual give a range of 12x6 to 12x8, so the load of a 12x6 is at the low end of the prop range. The .61FX is a ringless taper bore engine and should not be broken in slobbery rich. 3 or 4 tanks should be plently before flight. I'll find a link to Dar Zeelons instructions for a ringless break-in and edit it on to this post. [link=http://www.rcuniverse.com/forum/Tapered%2DBore_Engine_Break%2Din_%2D_Upgraded/m_1850473/tm.htm]Dar's Instructions[/link]