February 1, 20251 yr Introducing myself because I've just brought a '82 320. Haven't rode for 20 years, now live in S.Wales so thought I'd buy a bike to do some trail riding before I get too decrepit (I'm 68!) to ride. Used to ride a Ossa MAR, never in comps though. Don't know much about the brand, apart from it's a pretty bike (shallow reason to buy, but you know!). The bike seems good for the price I paid. It's a bit visually challenged, seat vinyl torn, frame paint missing etc., but seems to run well. Has been used in trials, so I think it's ok mechanically. And some questions! Neutral seems hard to find when the engine is running, OK when engine stopped and slightly easier down from 2nd, rather then up from 1st? The decomp lever is broken off, still available or is there an alternative? Best oil for the gearbox, how much do I need and where is the drain and filler? And finally, fully, semi synthetic or mineral 2 stroke oil and what ratio? To be honest, don't know much about single cylinder 2 strokes. Plan is to spend spring and summer using, then a restore/rebuild over next winter. Thanks Andy
February 2, 20251 yr 👍 In vintage events we use to call them cheater bikes because they could do so much more compared to a 70's TY or Bultaco etc. Gearbox oil is nothing special, as with any the more frequent you change out the clutch/transmission oil the better. For premix I would run full synthetic at lean ratio to keep the exhaust clean. Rotary valve 2-strokes are extremely powerful and about the most common way to destroy one is to not keep the intake air clean, or to over-rev the engine. You don't know what you are missing by not riding in winter ⛄ studded tires are a game changer and can extend your riding season to 10 months of the year 😎
February 2, 20251 yr Gear oil , use automatic transmission fluid, 1200ml. On the sump there is an alan key sump plug to drain ( do not touch the 17mm hex beside it, you will regret it if you do) Neutral is never easy to find on this model, but easier with TQF. 50 : 1 - any quality 2stroke. Decompression levers available from motoswm. Probably get a replacement seat cover there too. SWM's won a world championship, and the ssdt. Very capable bikes. Edited February 2, 20251 yr by b40rt
February 2, 20251 yr If you have heavy equipment or farm tractors and typically have ISO 46 hydraulic oil on hand that works equal or better to ATF.
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