ukmatador Posted June 29, 2016 Report Share Posted June 29, 2016 I have an original 1969 MK3 Matador running with a 428 size rear chain. Have ordered a 13 tooth gearbox sprocket, the biggest apparently that will fit with the kick start shaft in place. Is there a smaller rear sprocket available? Am trying to get some where in between stock low gearing and pure road gearing. John Quote Link to comment Share on other sites More sharing options...
bullylover Posted June 29, 2016 Report Share Posted June 29, 2016 Contact Talon as they will make a sprocket to suit you. Or try that famous Bultaco shop in England. Or just use that auction site, the famous one. Quote Link to comment Share on other sites More sharing options...
johnjsy Posted June 29, 2016 Report Share Posted June 29, 2016 Hi ukmatador,I use 428 chain on all my bikes,& have a 15 T sprocket on a Lobito plus on 2 Alpinas with no problems. The chain does get a bit close to the kickstart shaft,but does not touch. I use ordinary standard chain,not O ring. I do have a 16 T to put on a bit of a special 326 cc motor,it will fit, but there are other jobs to do first. I have just had a look at my Metralla parts list,& interesting to note the standard fitting is a 17 T. The rear sprocket was a 42 T giving a 2.47 ratio. Those bikes would do about 92 m.p.h. Fast enough for you ? The Matador mk 3,pretty much the same motor,had std: gearing of 15--50 which is a 3.33 ratio,so I think a 46 T rear sprocket would be worth a try. Hope this helps,over to you....... 1 Quote Link to comment Share on other sites More sharing options...
ukmatador Posted June 29, 2016 Author Report Share Posted June 29, 2016 Well,red face at the moment. Came to fit the 13 tooth sprocket today and found it already had one! thought it was a 12. So with a 13 front and a 46 rear, which it has. 3.53:1, (8.4:1 overall) it is just too low geared for general road use. If a 15 tooth sprocket will clear the kick start shaft, 3.1:1 is available. 7.3:1 overall with the primary reduction. Will I notice much of a difference? John Quote Link to comment Share on other sites More sharing options...
feetupfun Posted June 29, 2016 Report Share Posted June 29, 2016 A change in the front sprocket of one tooth makes a noticeable difference. Two teeth on the front makes a large difference Quote Link to comment Share on other sites More sharing options...
ukmatador Posted June 30, 2016 Author Report Share Posted June 30, 2016 Thanks for the help guys. There cheap enough to change so will try a 14 tooth. Not looking for a massive change but at the moment 40 mph and its revving too much for road use. John Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted June 30, 2016 Report Share Posted June 30, 2016 14/52 was standard on the Sherpa. We used to fit a 15 for running around but I don't recall it feeling anything but low in top on the road if that is any guide. Quote Link to comment Share on other sites More sharing options...
naichuff Posted June 30, 2016 Report Share Posted June 30, 2016 As 2stroke 4stroke says that was the norm I used 15 for trail work and 16 for long roadwork on my M49 and the 325 I had They were quick on standard gearing On 16 you could not pull 5th in town without speeding (30mph)But would sit at 70mph all day easily these used the smaller chain size but the later bikes the chain was bigger as on the 175 I have Quote Link to comment Share on other sites More sharing options...
jc2 Posted July 1, 2016 Report Share Posted July 1, 2016 You may find that your Matador does not have the usual wide ratios typically specified for Matadors/Alpinas/Lobito/Fronteras etc. I had one early Matador engine that had much closer ratios from another model. Quote Link to comment Share on other sites More sharing options...
bultacosd Posted July 2, 2016 Report Share Posted July 2, 2016 I geared up my mk3 by increasing the size of the front sprocket. Unfortunately I can't remember the size. Cruises at 55mph no problem. 4 Quote Link to comment Share on other sites More sharing options...
scot taco Posted July 3, 2016 Report Share Posted July 3, 2016 Very nice looking MK3 bultacosd. Quote Link to comment Share on other sites More sharing options...
ukmatador Posted July 3, 2016 Author Report Share Posted July 3, 2016 Nice. I see you have the SD exhaust on yours, mine has the trials type so wont breath as easily. Have fitted a 14 tooth sprocket but waiting for DVLA to send me a registration number so can try it on the road. Quote Link to comment Share on other sites More sharing options...
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