Leo100 Posted February 6 Report Share Posted February 6 Good afternoon just wondering if anyone can help me find out the year of a Montesa cota I have just purchased frame and engine numbers are 51M5994 cheers Jeff Quote Link to comment Share on other sites More sharing options...
majesty Posted February 6 Report Share Posted February 6 Hi Jeff, Welcome to the forum. This site should help : https://cybermotorcycle.com/marques/montesa/montesa-numbers.htm Quote Link to comment Share on other sites More sharing options...
Leo100 Posted February 6 Author Report Share Posted February 6 Cheers for that I will take a look 1 Quote Link to comment Share on other sites More sharing options...
woody Posted February 6 Report Share Posted February 6 Unfortunately prefix 51 covers the 348 and entire 349 model range so without knowing which number range was used for which model you can't tell what it is from the number Quote Link to comment Share on other sites More sharing options...
Leo100 Posted February 7 Author Report Share Posted February 7 Ok thanks for that I will have to keep on investigating Quote Link to comment Share on other sites More sharing options...
woody Posted February 7 Report Share Posted February 7 Put a picture of the bike on here or one of the facebook groups as it's a lot easier to identify the actual bike itself than from a frame number Quote Link to comment Share on other sites More sharing options...
nh014 Posted February 12 Report Share Posted February 12 51M5994 is a 348 Cota, probably a late 1977 or early 1978 model. Here is a chart of 348 Cota improvements from the start of production in 1976 through 1978. 51M000 First mass produced 348 Cota 51M3132 Change in filter housing is added deflator antiwater screen. 51M3699 Step is added chain guard on engine crankcase forwarding. Change speedometer. 51M3790 Change elements of the carburetor. 51M4722 New front fender. 51M5059 The 3rd speed gear on the secondary axis from 15 to 16 teeth to shorten development. 51M5599 Amending the bottom flange of the triple tree to open a passage for the cables. 51M5707 Improved gearshift by ensuring the pinion is free and moveable. 51M6828 Chain guide fixing hole diameter reduced. Spacers fixed to prevent wear. 51M7200 New Telasco “Hydrobag” rear shocks. Improved front suspension with gas. Improved spring tube protectors. New brake and clutch levers. Eccentric chain tensioning step further reduced. 51M10107 New rubber grips on handlebars. 51M11307 New black and gold tank decals. New fixing system and roller rocker gear which ensures the positioning of the new shifter and rear brake rigid optic headlight. New flywheel. New front suspension with air pressure suspension arm protector 51M12305 Rear shock suspension modified. 1 Quote Link to comment Share on other sites More sharing options...
Leo100 Posted February 14 Author Report Share Posted February 14 Thanks for that I don’t suppose you could tell me where I can get a new set up piston rings from could you it is a (STD +0) piston on the bike Quote Link to comment Share on other sites More sharing options...
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