furse Posted February 6, 2007 Report Share Posted February 6, 2007 I am thinking of doing a few upgrades to my 315 montesa. I've heard of a different barrel and head being put on. Boysen rad valve being put in, flat side carb, has anybody done any such upgrades to their monts and was it worth it / how much did it cost. I've put the jitsie shock plates on, different clutch plates. I don't want to throw money at it as its always only going to be an old 315, but I don't ride often now and have got money left over from selling my 4RT. Any suggestions? Quote Link to comment Share on other sites More sharing options...
mattylad Posted February 8, 2007 Report Share Posted February 8, 2007 Best mods to do are; Porting barrel send it to Haven. Modify ignition pickups to advance engine. Boysen reeds only. Keihin carb. Jitsie plates. If above is done it will feel much livelier and steer better. A couple of hundred quid should sort it. Quote Link to comment Share on other sites More sharing options...
subira Posted February 9, 2007 Report Share Posted February 9, 2007 Only additional one that might be worth a try is to change the 'S' shape pipe inside the silencer to a straight pipe. If you get hold of some punched out sheet, then you can make this up for a couple of quid. Quote Link to comment Share on other sites More sharing options...
furse Posted February 9, 2007 Author Report Share Posted February 9, 2007 Thank you both for your replys, that gives me somewhere to start, cheers Quote Link to comment Share on other sites More sharing options...
jimmyl Posted February 9, 2007 Report Share Posted February 9, 2007 I think motocross type shops stock perforated tube as standard, just need diameter required. Was going to chnage mine before SSDT last year but ran out of time. Quote Link to comment Share on other sites More sharing options...
pedronicman Posted February 9, 2007 Report Share Posted February 9, 2007 DEP Pipes make the silencer cores you require- in 3 different 2stroke diameters Any decent mx shop should be able to get them or call DEP www.deppipes.com Quote Link to comment Share on other sites More sharing options...
mad4it Posted February 9, 2007 Report Share Posted February 9, 2007 I have a second hand but only used once kiehin carb for one of these if interested ! Quote Link to comment Share on other sites More sharing options...
furse Posted February 11, 2007 Author Report Share Posted February 11, 2007 I have got a Dellorto flat side carb, but how much do you want for Keihin? Quote Link to comment Share on other sites More sharing options...
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