OS Max FS-20 4-Stroke OHV RC Model Engine with Exhaust Muffler & Motor Mount Vintage! 

One vintage OS from Japan!

A high quality 1985 vintage OS.  The smallest capacity production OS 4-stroke engine. 
Tech Specs (from OS & Peter Chinn*):Displacement: 3.56 ccBore: 18.0mmStroke: 14.0mmRPM range: 2,500 ~12,000 rpm
Weight: 265g
*Power output: 0.31 BHP @ 12,500 rpm
*Torque: 28 oz-in at 9,000 rpm
*Model Airplane News, Feb 1986
*Peter Chinn in his review, found the FS-20 to be "a very practical small 4-stroke, well able of compete with popular 2-strokes of similar size and weight but with much more acceptable noise levels, even without a muffler".
Condition wise, this engine is new & turns over smoothly with new engine compression.  Engine comes with box, packaging, papers in their sealed packet (instructions, safety instructions, OS Engines catalogue, decals & mounting card template), tools set, optional OS exhaust muffler & OS motor mount.

International bidders are welcome!  Shipping worldwide at cost with tracking number.

The OS Max FS-20 4-Stroke; perfect for the RC flyer! 

Don't forget to check out my other items on eBay, for Graupner OS Skeleton Wankel, Graupner first model 1800, 49-PI model 1801 & OS 49 PI Type 2, Saito FA-90 R3 radial, G-Mark 5 radial, Enya 35-4C & Enya 40-4C open rocker, Saito FA-30 Mk1 open rocker, OS Max FS-60 Mk1, Mk2 & Mk3, OS Max 61 RF Hanno Special & other fine vintage engines...

Happy bidding & good luck!


About the new "ebay payments" interface just introduced by ebay & its effect on dispatch time
We all got used to ebay purchases with PayPal payments, that cleared immediately, resulting in fast dispatch.  Ebay have now introduced "ebay payments".  Ebay are saying "The payout will generally be initiated within 2 business days from the order confirmation. Once initiated it typically takes up to 4 business days for the funds to clear in your account and become available to you".  The onus is on the seller to keep checking when payment has cleared.  Thusly, this new "ebay payments" interface could add up to 6 working days to dispatch time compared to the aforementioned PayPal payments.  I imagine somebody will get a bonus for this.  This new payments thingy forced upon us (you can't opt-out of it) has therefore added 5 working days to my dispatch time.  Please bear this in mind before placing your bid.


Please note the item is for sale by a private individual & in accordance with section 2.18 of the DTI (Department of Trade & Industry) OFT (Office of Fair Trading) Distance Selling Guide Sept 2006, the guidance for UK implementation of the EU consumer DSR (Distance Selling Regulations), so this item is NOT subject to return nor refund. By placing a bid on this item you fully understand (1) no return of item, (2) no refund for said item & (3) stated postage & packing charges.  Most hobbyists understand that even some manufacturers in this hobby do not accept warranty claims due to "the nature of the hobby" & set their expectations accordingly