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OS 46 FX

new liner cylinder

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MikeQ27/02/2019 08:57:08
100 forum posts
93 photos

My OS 46 FX has gradually gone down hill over time and is spewing out BLACK exhaust residue. I'm lucky not to have dead sticks 50% of the time. Taking the cylinder head off I can see a lot of the plating has gone around the top.

I use Duraglow 10% and a 12x6prop on a mini pattern model. I'm usually tach the engine on the ground at 10K rpm. I'm pretty sure I don't run it lean in the air.

I had this years ago with and OS 46SF and apparently there was a fault with the liner. Anyway ... question is ... does anyone know if the OS 46 AX liner/piston is interchangeable with the OS 46FX. Or does anyone have a new ASP 46 liner/piston they'd like to part with as apparently that was a dodge.



Denis Watkins27/02/2019 09:27:12
3938 forum posts
64 photos

I don't know about your piston and liner Mike

But I do know that black discharge is aluminium and oil mix from rubbing

It can be just a loose vibrating silence causing the goo, so just nip up around the motor next time out to test

MikeQ27/02/2019 09:30:39
100 forum posts
93 photos


I'll have a look see.



FlyinBrian27/02/2019 10:57:57
527 forum posts

The FX range were the first to suffer from the peeling liner issue, my .46 suffered from this, eventually fixed under warranty. I do not recall any black goo though just a lack of compression.

Nigel R27/02/2019 10:58:08
3176 forum posts
487 photos

I doubt the AX will interchange with the FX, the engine looks fundamentally different, 4 bolts not 6, which indicates the porting may well be in different places.

Maybe worth searching out a parts engine on ebay, or even a complete 46 to run, a used one is around £30.

RC Plane Flyer27/02/2019 11:02:52
662 forum posts
19 photos

Did I read somewhere an ASP piston and liner fits. A call to Just Engines may answer this

Jon - Laser Engines27/02/2019 11:04:04
4900 forum posts
188 photos

Many OS's have suffered this issue with the cylinder plating. A friend has about 6 46fx's that have suffered.

While i have not been able to test it myself i believe the asp piston and liner from their 46 will fit the fx as the asp is a clone of that engine.

As a side note duraglo is dreadful fuel, switch to something more modern like model technics laser 5 or techpower 5. Its much cleaner and works better as well

MikeQ27/02/2019 12:21:10
100 forum posts
93 photos


thanks for the feedback ...If it is a common known issue do you think I might still stand a chance of getting it fixed on my FX motors ... I've actually got two with the same issue. I wouldn't care but you buy OS and pay extra for the quality and I'm sure I've never run them lean per se.

I guess its Ripmax I'd need to contact ... now that all my local model shops have gone!



PS As far as I can see the ASP piston/liners aren't available anymore or are like hens teeth.  Either that or I'm just useless at Googling stuff.








Edited By MikeQ on 27/02/2019 12:22:15

Manish Chandrayan27/02/2019 12:22:49
606 forum posts
70 photos

ASP 46 parts will fit the OS 46 FX. Give JEN a call.

Jon - Laser Engines27/02/2019 12:23:03
4900 forum posts
188 photos

The FX was discontinued donkeys years ago. There is no chance of a warranty claim at this point

MikeQ27/02/2019 12:31:25
100 forum posts
93 photos
Posted by Jon - Laser Engines on 27/02/2019 12:23:03:

The FX was discontinued donkeys years ago. There is no chance of a warranty claim at this point

Haha ... thought as much but 'shy bairns get nowt' as they say up here in the frigid north

I'll check out the JEN option too ... hate to waste what are otherwise good motors.

It is a bit annoying ... I know there are loads of engine torturers out there but I'm sure I'm not one of them ... and neither of these motors have been used to a great extent in reality.



RC Plane Flyer27/02/2019 12:58:12
662 forum posts
19 photos

My goggle link says piston and liner available If not pm me as i have an asp 46 available for spares

Nigel R27/02/2019 14:14:48
3176 forum posts
487 photos

Just Engines don't currently have any ASP stuff - until after their factory relocates - according to the JE website.

Parts engine?


Alan Gorham_27/02/2019 14:25:59
1077 forum posts
129 photos

Sorry that's not right. Just Engines say they don't have any stock of ASP engines, but they have always carried a huge amount of ASP spares - my bet would be they will have a P&L set in stock.

The ASP 46 piston and liner is a well known fix for this exact problem - see various other fora and the HK website.

extra slim27/02/2019 15:22:20
451 forum posts
48 photos

echo Jon's point on the fuel... 'orrible'.. years ago my two strokes seemed to love it instantly, but after a few weeks/months developed lots of hot runs, and my engines started to suffer.. luckily a pal I flew with was developing new fuels (Andy at Opti) so I switched a long time ago to modern formulas.

Nigel R27/02/2019 15:22:36
3176 forum posts
487 photos

My mistake.


S46203 ASP 46 Piston & Liner

Price: £37.04 (Including VAT at 20%

Engine Doctor27/02/2019 17:14:18
2344 forum posts
28 photos

Hi Not all the asp cylinders fit the OS counterpart. The SC / ASP 32 does  fit the OS 32 SX which was I believe the first of the OS engines that shed the plating when production moved to Tiawan years ago. I have never had an SC / ASP or a Magnum shed the plating ? OS definitely shot themselves in the foot then and Ripmax repaired engines FOC . Unfortunately the repaired engines very quickly went the same way . I'm not sure they do the repairs anymore .

Edited By Engine Doctor on 27/02/2019 17:16:26

Braddock, VC27/02/2019 19:22:38
1634 forum posts
82 photos

Faint heart never wotsit fair maiden, ask Ripmax if they can fix it, I had a donkey's years old 10 fp and a 46 fx with duff liners, phoned up and they renewed both the liners and pistons for the cost of postage to them. Can't remember when but it was after production of both ceased.

It was a well known fault. Try e-mailing OS direct (it's free isn't it), if ripmax don't honour their responsibility, they just might do it.

Edited By Braddock, VC on 27/02/2019 19:24:11

MikeQ27/02/2019 22:16:39
100 forum posts
93 photos


I'll try Ripmax re a freebie but it looks like JEN actually have the right spares. Emailed them and they came back confirming.

thanks for the feedback and advice re fuel.

ill let you know how it goes.



Doug Campbell28/02/2019 08:10:06
96 forum posts
2 photos

I am curious about the comments for Duraglow. I like many others have used it for years without problems. What makes a fuel more modern?

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