I get a lot of queries as to 4 Stroke Engine weight. I weighed some of mine last night and you can draw your own conclusions.

I should also add that, for what it’s worth, I believe that this whole ultra-light engine stuff is really not that critical.

Unless noted, all engine weights include factory muffler.

From light to lard, in ounces:

SAITO .30               9.4
SAITO .40               10.8
SAITO .30 open rocker, no muffler*      12.4
ENYA .35 open rocker, no muffler*      12.8
Surpass .40            12.9
ENYA .40 open rocker, no muffler*      13.1
SAITO FA-45, no muffler*         14.6
ENYA .53               15.4
SAITO .56               15.6
ENYA .90               28.3 

From a standpoint of raw power for their size, the two that seem to have the most are the ENYA .53 and the Surpass .40.      

I have quite a few more to weigh and will do so in the near future.

As I recall, the SAITO .80 that I splattered on the Red Baron was about 18 ounces – I wasn’t too impressed with it.

* as far as I know, these were never offered with mufflers.

Hope this helps,

   Bob Z.

Hi, Lee - the .40 that I have on my weight list is the 40A, not the FA-40. They are totally different, the 40A being very small and light. It is a brand new design.

The FA-40 is a nice engine but power to weight was an issue. That's why they went to the FA-45.  A little more displacement made a lot of different.

I had an FA-40 but gave it away - I still have the  FA-45. As far as I know, virtually all the parts are interchangeable.

I recently made another post giving some info on the FA engines.

Bob Z.

ps - check out my reply #7 in "Speaking of Four Strokes"

Hi, Ron - yep, really nice weight.
As you saw, I weighed my 40A at 10.8 ounces - close enough for cheap scale accuracy.

Bob Z.

I dug up a few more 4S engines and weighed them.

ENYA 46 -------- approximately  15.1
OS Surpass .26 -------------------10.0
OS 20 ------------  approximately 9.6
HP VT .21 ---------------------------11.9 
WEBRA .60 --------------------------22.7 
OS .40 ----------- approximately 13.0   
OS .60 - open rocker, no muffler 21.5 
OS Surpass .52 --------------------15.2
OS Surpass .48 --------------------14.5
OS .90 rear camshaft -------------25.1 

Bob Z.

           

Gordon - I'm  sure you're correct on that. I have heard the same from a number of people who were looking for .30s and .40s.  They are apparently still available in Japan but not imported here.

It's a shame as they are two of my all-time favorite engines. The .30 especially is, in my opinion, one of the best and most user-friendly engines I've ever used in stunt and sport. 

Bob Z.