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OS 120 E four stroke Engine

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tigerman10/08/2018 16:20:42
116 forum posts

Need a new good 120 four stroke engine .My favourite four stoke engines are almost hard to obtain and are always out of stock so I will have to find a replacement and OS are the next best engines but it looks like OS no longer do a 120 four stoke but I see there are a few OS 120 E four stokes available still, just wonder what they are like ?

Jon - Laser Engines10/08/2018 18:06:54
3914 forum posts
151 photos

The 120E is similar to the original surpass and is a good general purpose engine but its no power house. The exhaust supplied is also small and loud so will need replacement if you have a noise limit at your site.

Beyond that they are good engines. A friend has the pumped version but its effectively a 120E as the pump gave up the ghost and its now got a standard asp120 carb on it. It runs a 15x8 prop in the 8300-8500 range and powered his 70 inch spit quite nicely.

If you can find a non pumped surpass III you will be better off but they are pretty spendy if I recall.

tigerman10/08/2018 19:52:54
116 forum posts

The other 120 four stroke someone suggested was the ASP 120 but I thought this was a budget type engine and not sure of the quality of this engine but I could be wrong

Don Fry10/08/2018 21:02:35
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2543 forum posts
30 photos

You are wrong. Nice motor.

Percy Verance10/08/2018 22:07:33
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6730 forum posts
133 photos

About 10 years ago I bought an ASP .61 four stroke simply to find out how they perform. I fitted the engine to a model and flew in relentlessly. Ok, after a couple of years of solid regular flying it was beginning to show the early signs of getting slightly tired, but as far as the actual running and throttling went, an OS couldn't have done better........

ASP spares prices are very reasonable, so a refurb wouldn't cost a fortune unlike an OS......

Bob Cotsford10/08/2018 22:10:35
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7320 forum posts
419 photos

The ASP 120 is a good engine but from my experiences with that and one of the OS's, the OS will beat it both on output and carburation. My OS would turn a 16*8 APC quite happily while my ASPs were better on 15*8, the OS was easy to tune for a smooth throttle action, the ASPs were harder to setup for a smooth midrange transition. The ASPs were still very good engines just not as refined as the OS.

John Duncker10/08/2018 23:26:57
9 forum posts
7 photos

Saito 125s are available of the shelf AFAIK.

Not cheap though but quality rarely is.

Jon - Laser Engines11/08/2018 02:10:07
3914 forum posts
151 photos
Posted by tigerman on 10/08/2018 19:52:54:

The other 120 four stroke someone suggested was the ASP 120 but I thought this was a budget type engine and not sure of the quality of this engine but I could be wrong

If you want it to last for ever, has great performance/quality and a nice finish then its the wrong motor. if you want an inexpensive power plant that works and you throw away when past its best then crack on.

Just ignore the ASP run in instructions, there is a better way to do it.

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