November 13, 20169 yr Hi I am building a 1976 Montesa Cota not a full resto just so it works good so I can ride and ride. My question is the engine has 2 oil fill caps. What oil does it take and how do I check the oil level or drain the old oil. Need to get this right so figured this is the best place to get the correct info.
November 13, 20169 yr Inner filler cap is for the gearbox, outer one for the clutch. There is a similar plastic drain plug under the engine for the gearbox, the clutch case is drained by removing the flat headed chrome screw on the outside of the casing. I use the following: Clutch: 200cc automatic transmission fluid Gearbox: 300cc 75w gear oil There is no level plug or sighting glass, just fill with quantities above. This info is for the Cota 247, which I have presumed to be the bike you have. Edited November 13, 20169 yr by cleanorbust
November 13, 20169 yr The drain plug under the gearbox uses to be a 19 mm screw. The original oils were a 10w30 for the clutch (Motul Transoil can be a choice) and a SAE 90 for the gearbox, but you'd better refill with an API GL-4, because API GL-5 will corrode the yellow metal parts in the gearbox.
November 13, 20169 yr Is that true about API GL-5 as I've just spent a paranoid half hour googling it and apparently it's a bit of myth? I use Morris API GL-5 in my Cota
November 14, 20169 yr Couldn't you use something like the Motul Transoil in both the clutch and gearbox as that's what it does in a modern bike ?
November 14, 20169 yr Author Awesome thanks so much for the info. Almost done just a few pieces to sort out then ride and ride and hopefully a good run before any other repairs. I recon I will have to grin like Malcolm Smith " that was really neat Malcolm "
November 14, 20169 yr Good to know you'll soon be up and running. Any chance of posting a photo or video for our interest?
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