William Robison

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I have not been religious about running them dry after a flying session, nor have I been religious about after run oil. I always intend to run them dry and oil them up, but in common with my Saitos, my K&Bs, and even the little Cox engines I don't always do it.

Since I quit flying control line speed I have replaced two sets of bearings other than during an overhaul. These two were a Saito FA-120, and a K&B ringed 61 engine. These engines were both bought used, and the bearings were bad at the time of purchase. Sorry, just remembered a Saito FA-80 I changed them in also, but in another sense that one doesn't count as I did a major overhaul before putting it in service. Another engine bought used.

Bill.

1Jimbo

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I have had some of my OS engines peel but not all. I have 8 of the OS.FP engines and all are in great shape.
Has anyone EVER seen or heard of an OS.FP engine peeling?

aston70

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I have two .40 OS FPs. Both run like a champ. The carb barrel looks smaller in diameter than most of the other .40s I have, but doesn't seem to make a difference to me.

gnirwin

My Feedback: (25)

I am in the market for a .46 size engine. The local hobby shop has the OS AX .46 $10.00 off. I have been reading this post the last couple of weeks and I had at one time my mind made up on a new OS. Well I went to the Hobby Shop today and was talking to the manager. I flat out asked him about peeling liners and he said of all the OS engines he sells (This is the largest Hobby Shop, by sales, in Ohio and one of the largest in the midwest) that he has had just a couple that he can remember with bad liners out of the hundreds that he has sold. He says he has more problems with defects on all the other brands he sells than the OS. He sells all the major brands TT, Magnum, Tiger Shark, Weber, Norvel etc. etc. Well I am going back to the HS and I will buy one of OS 46's on sale. A side note. when I was at the HS today I also noticed that they had one of the new Sk engines from Kangke, a .80 size. I also asked the manager about this engine, He said that he only had a couple that he was selling and he was not going to order any more until the couple he has or will sell are out in the field and proove not to be junk. Made me think that if the liners were peeling real bad he wouldn't be selling the OS engines either.

Motorboy

Older OS engines are better than new, These OS FP engines had never problems with peeling, liner of steel with cast iron piston. I belive newer FP had ABC and does not peeling of liner.

Jens Eirik

Flyer95

My Feedback: (1)

Hi
The price of one engine has alot to do with the importer and the distributor of that engine. All modell engines are much more expensive in Sweden compared to USA, probably 50% more expensive[], because of the higher taxes and lower quantities, but some very high quality and high performance engines like MVVS, Irvine, Rossi and Saitos are almost as cheap as the cloned engines like TT, ASP, Magnum, SC..... OS engines are expensive but not much more expensive than the TT:s. Thanks/ Amir

1Jimbo

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The FP engines I have are ABN.

gnirwin

My Feedback: (25)

I feel so much better today, yesterday I went out and bought an OS .46 ax engine and I worried all night if I did the right thing or not seeing how they have the liner "peeling" issue. But today I am reading where people are replacing the bad carburetors on their Magnum xls 52a's with Os .46 carbs and the engines run great, no more deadsticks. Well I have a Mag 52a that has never quite run right so if my liner peels on my OS I'll finally have one sweet running little engine....oh boy...oh boy...oh boy![8D]

skypupmut

I own 119 running engines
23 of them OS of var.vintage
some with over 300 flights
I also have 3 Os in my engines for parts box with oealed liners
2 fx and one SF funny thing is they came from same owner
I repair and fix engines for most of the guys around here
the fx 46 with pealed liner has less than 30 flights and 4-5 years old
spare liner and piston here in Canada is 132 dollars plus taxes
so in the parts box it went

Flyboy Dave

My Feedback: (21)

.....then there's the Guys who have problems with Magnum carbs. The fact
is, they're gonna have problems with any carb because they don't know how
to set them. I use those 40-46 Magnum carbs on K&B's....I have used them
on Enya's.....I'm pretty sure the .52 carb is the same.

....fact is.....those double needle carbs are copied after OS 7B arbs, and work fine.
They are not exact copies....a slightly different casting, but the same style carb.

FBD.

AirGar

My Feedback: (7)

Looks like you have all angles covered. GOOD LUCK with the OS!

BTW, we ended up returning a Mag 52, as it just wouldn't run. It was replaced with a GMS 47 that runs like a clock. Of course, I bought 2 of them, one runs great and the other has a "WOT problem.

Maybe....JUST MAYBE.....one of these days, someone will get it right!

Gary

britbrat

Not all double needle carbs are the same. Some do indeed use two needles (TT & OS for example), wherein the low speed mixture is controlled by a needle that slides into the end of the fuel jet in the throttle bore. Some others (MECOA & LEO for example) use a grooved cup that slides over the jet. Both types, however, are actuated the same way & adjusted the same way.

bigbri

My Feedback: (287)

I am a die hard OS fan. although I realize there are other decent options....I know what I am getting with OS. I fly at a field that is surrounded by trees, has many obstructions, and is next to a highway we cannot fly over. It's like trying to land on a carrier deck....a dead stick landing often results in a damaged or destroyed aircraft. When i started flying (24 yrs ago) I noticed the guys who's engines started easily and run flawlessely were flying OS. The guys were always having engine problems were flying everything BUT OS. I have heard of the peeling problem, but never experienced it myself..........and i have a lot of time on my engines !!!!
Now I am not a great fan of Hobby services, But expecting them to warrenty or send you free parts for an engine they discontinued almost 9 years ago is kind of unreasonable......don't you think ?????
my 2 cents
Brian

P.S. BTW everytime someone flying brand X engine seems to get it to run as good as an OS....It's usually because they have stuck an OS carb on it.......Doesn't seem like they saved much money that way....buy it right once !!!! you wont have to buy it agian
B

jessiej

[P.S. BTW everytime someone flying brand X engine seems to get it to run as good as an OS....It's usually because they have stuck an OS carb on it.......Doesn't seem like they saved much money that way....buy it right once !!!! you wont have to buy it agian ]

Interesting. I have never seen that done. I have seen Perry carbs as replacements but not those of other engine Mfrs.

jess

1Jimbo

My Feedback: (2)

Most engine troubles other than peeling are caused by simple easy to fix problems. Most pilots don't know how to find and fix them. Many pilots don't even know the correct way to tune an engine. I see it at my club all the time.

gnirwin

My Feedback: (25)

there is a recent post on this board (scroll down about 10 posts and you will see it) about the Magnum 52 2 stroke and there you will read about people putting carbs from old OS engines on their Magnums to get them to run right. I must admit I own 4 Magnums and 3 Os engines and they all run very good and I have no problems with the exception of my Magnum 52 2 stroke that at times just will not run correctly. It is one of my newer engines so I want to get some more flight time on it before I come right out and call it a bad engine.

Flyboy Dave

My Feedback: (21)

I was reading back throught his thread, and I saw a few mentions of....

....perhaps a grain of sand , or a spec of dirt....had been ingested into
the engine and caused the complete failure of the engine liner.

Sorry boys and girls....I ain't buying that one. If that were the case....
perhaps 75 to 85% of all those engines that flew from an asphault,
concrete, dirt or grass runway....would have suffered the same fate....
refering to the nickle liners. One spec of dirt wont blow an engine. If that
were the case, the engines would be supplied with an air cleaner.

The fact of the matter is, most engines get more dirt in the carb just sitting
on a runway all day, than they do when they are running. If you haven't realized
that fact, you might want to look more closely.

FBD.

aston70

My Feedback: (1)

I have an old Magnum Pro .45 that I had trouble with the carb. I put one on it from an old O.S. Max-H .40. Runs great.

blw

My Feedback: (3)

The only OS engine that I had was a .46 FX that gave me more deadsticks than I care to think about. I'm glad I took it off the plane and put an Evolution .46 NT on it. The NT has a lot more power and is not as sensitive/touchy to tuning both needle valves. I would take my Evo .45 training system engine over the .46 FX any day. Don't get me started on prices either......

aston70

My Feedback: (1)

Looking back, maybe I should have clearified my last post. The trouble I had with my Magnum carb was due to some broken parts, most importantly the needle valve keeper which meant that my needle valve wouldn't stay put. The vibration made the valve open. My old OS was in my parts box so I robbed it's carb because it fit. It was a fast and no expense solution that turned out to work pretty good.

Flyboy Dave

My Feedback: (21)

Dan....

....I started putting OS 7B carbs on my K&B .61 engines back in about '74.
I just looked, and I have that same original 7B carb on my Ultra Stick, with
a K&B .61. This is a match made in Heaven....the side mounting screws even
fit perfectly. This carb has been through Hell and high water....I paid $35.00
for it back then. [X(]....it still works perfectly. I did change the o-ring on the
low speed needle a couple years ago.

FBD.

aston70

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Can you still get these? Looks like it might fit a K&B 65 Sportster. I was actually looking into a perry carb.

Flyboy Dave

My Feedback: (21)

No....the 7B was discontinued a long time ago, it was from the '70's.
I just realized that this is the engine I got, missing the carb....way back
when. It still exists, 5 rebuilds....and 3 crankcases later. I should reunite
the carb and engine....

Now I use the Magnum 40-46 carbs....they are excellant. They are a bit
loose in the case spigot....so I use some wraps of teflon tape tp make
up the difference. Just twist the carb in, and tighten it down. I know it
sounds Mickey Mouse, but it works fine....no leaks. The cool thing is....

....if you wreck the plane, the carb pulls out....without breaking the case.

FBD.

William Robison

My Feedback: (3)

Dan:

The ringed 61 and Sportster 65 have the same carb mount. If you're going to buy a carb, the Perry is a little less expensive (in most cases) than the OS carb. You can also get the late style K&B "Ribbed" carb, it's an update on the Perry design.

I have an email working for you.

Bill.

Flyboy Dave

My Feedback: (21)

I tried a Perry carb once....and I do mean once on a K&B .61....

....after fooling with the plastic imitation carb for a period of time....

....I took it off, put it on the ground, and struck it squarely with a 2 lb ball peen hammer.

FBD.