chris_ Posted April 2, 2012 Report Share Posted April 2, 2012 I found this site which, although in Spanish, gives the most comprehensive explanation of the evolution and development of the 247 that I have seen. Google translate may help! http://nacho247.blogspot.co.uk/2012/02/evolucion-de-la-cota-247.html Quote Link to comment Share on other sites More sharing options...
triple_x Posted April 2, 2012 Report Share Posted April 2, 2012 Thank you. Very,very useful it confirmed my thoughts that the tail pipe was rectangular (thin slot). Regards Martin Quote Link to comment Share on other sites More sharing options...
keychange Posted April 3, 2012 Report Share Posted April 3, 2012 that's great - Chris my 247 is actually the 21M21482, may-76 Cota 247T trail, new decor red stickers. but I have the 21M25307, Jul-78: New Dimension 247T body and seat fitted at the moment. Quote Link to comment Share on other sites More sharing options...
triple_x Posted April 3, 2012 Report Share Posted April 3, 2012 Hi My original had an rectagular tube tail pie with the outlet biased to the of side of the silencer so that it missed the rear mudguard and fitted neatly between the shock mount and mudguard. The one I currently have has a round tubular outlet that requires the mudguard to be trimmed to get through the gap! It appears original, but to me seems strange as i cannot understand why the factory would produce it in this way. Are there any pictures that show the layout for 21M1800 model thet was made in April 70. Hope you guys can help, and yes I know the frame should be white!. https://lh4.googleusercontent.com/-Y63G3g9XTHw/T3tnRK1I6UI/AAAAAAAAAf0/w1ezYEZ4Ufc/s128/P1020927.JPG https://lh3.googleusercontent.com/-BnuhfgxGrxo/T3tnSgits_I/AAAAAAAAAf8/3pMm_SFEAzU/s128/P1020928.JPG Regards Martin Quote Link to comment Share on other sites More sharing options...
keychange Posted April 4, 2012 Report Share Posted April 4, 2012 (edited) I note the 247T below which is my model has a white or silver frame - mine is black which with the current 78 model tank and seat fitted works. But if I want to return it to original does anyone know if that is white or silver? Also does anyone know who can reproduce the tank decals - mine are a bit knocked around I never realised the original guards were polished - I cut mine back to bare metal but the thought of turning that into a highly polished smooth finish was daunting and so the white paint went back on Edited April 4, 2012 by keychange Quote Link to comment Share on other sites More sharing options...
chris_ Posted April 4, 2012 Author Report Share Posted April 4, 2012 (edited) I note the 247T below which is my model has a white or silver frame - mine is black which with the current 78 model tank and seat fitted works. But if I want to return it to original does anyone know if that is white or silver? Also does anyone know who can reproduce the tank decals - mine are a bit knocked around I never realised the original guards were polished - I cut mine back to bare metal but the thought of turning that into a highly polished smooth finish was daunting and so the white paint went back on The only white 247 frames were the very early ones (mk 1 & 2) up to 1971. I think that the guide that I linked to, has got the two photos for the Trails the wrong way round. The silver one would have been first before changing to black. www.vallmoto.com have got your Trail decals. I have bought bits from these guys and happy to recommend them. Martin, I believe that your silencer should look like this one The early silencers don't fit later frames and vice versa, which you have found out. I had the reverse problem, where someone had (badly) fitted a mk 1 silencer to a later frame by cutting and moving the fixing mounts. Edited April 4, 2012 by Chris_ Quote Link to comment Share on other sites More sharing options...
triple_x Posted April 4, 2012 Report Share Posted April 4, 2012 Hi Chris Picture is a great help. My original 68 Cota had a straight rectangle outlet pipe. I modded mine to match the above picture and there was a slight improvement even though I kept the IRZ carb. What I can't remember is if the tapered baffle tube remained in the centre of the silencer or was set off to the offside rear! Or remained central in the box leaving the tail pipe off set and the gasses to collect in the rear portion (curved) to creat a bit of back pressure before exiting out the tail pipe. Nostalgia is great when I can remember! If you know the answer please tell, as I am about the cut and repack. Regards Martin Quote Link to comment Share on other sites More sharing options...
martin belair Posted April 5, 2012 Report Share Posted April 5, 2012 (edited) http:// http:// Gentlemen, the square exhaust tip (on the right and on bottom) came on the first 500 units as did the IRZ carb. The flatter wider tip came after bike 21M0500. Edited April 5, 2012 by Martin Belair Quote Link to comment Share on other sites More sharing options...
keychange Posted April 5, 2012 Report Share Posted April 5, 2012 (edited) The only white 247 frames were the very early ones (mk 1 & 2) up to 1971. I think that the guide that I linked to, has got the two photos for the Trails the wrong way round. The silver one would have been first before changing to black. Chris - that photo is definitely my model (77) as the 247T was not around until 1974 ( according to montesa web) and the early 247T had gold background decals in a different pattern where as mine has dark red body decals. According to montesa web my 21M23540 is post March 77 - the Australian compliance plate is May 77 - I always thought it would take longer to get from the factory to Oz. I guess that picture may not be a factory image and could be a restore where someone (like me) have mixed and matched tanks/seats - but it sure looks like a new bike to me and apart from the frame is identical to my original 247T set up. Edited April 5, 2012 by keychange Quote Link to comment Share on other sites More sharing options...
keychange Posted April 5, 2012 Report Share Posted April 5, 2012 I just received a 247 WES muffler from SM ( good fast service thanks) and at first fitting the tail end points away from the rear guard at about a 30 degree angle - sticks out quite a bit. It is hard to get images that show this so I am not sure if that is normal or should I be adjusting the bracket to bring it close to the guard Quote Link to comment Share on other sites More sharing options...
chris_ Posted April 5, 2012 Author Report Share Posted April 5, 2012 Martin and Martin, It is interesting that you mention the IRZ carb for the first 500. My mk 1 motor (#313) has an Amal 626 I have not seen this particular carb mentioned anywhere in relation to the 247 so I can only assume that it was a period alternative to the IRZ. My understanding is that apart from the first IRZ, all 247s had the Amal 627 As to the exhaust with this engine, it is as per Martin B's post, being the squarer shape. I don't know what it looks like inside though. Quote Link to comment Share on other sites More sharing options...
chris_ Posted April 5, 2012 Author Report Share Posted April 5, 2012 Andrew Having spent more time on this, and remembering the rule of don't believe everything you see on the internet, I think that these Trails went in the following order, confirming what you said. 1) 1974-1975 21M13830> 2) 1975 21M19779> 3) 1976 21M21482> Same shape tank and seat. New graphics 4) 1978 onwards. New style seat, shares the same rear silencer (two mounting holes) as the 247c Oddball graphic Quote Link to comment Share on other sites More sharing options...
keychange Posted April 5, 2012 Report Share Posted April 5, 2012 Chris yep and 1976 21M21482> Same shape tank and seat. New graphics is mine and that bike has black frame - I wonder where the silver/white frame picture came from Quote Link to comment Share on other sites More sharing options...
chris_ Posted April 5, 2012 Author Report Share Posted April 5, 2012 Chris yep and 1976 21M21482> Same shape tank and seat. New graphics is mine and that bike has black frame - I wonder where the silver/white frame picture came from The silver bike must be either an earlier bike that has had a Trail seat fitted, or been repainted. I think that we can safely sat that all Trail frames were originally black. Quote Link to comment Share on other sites More sharing options...
triple_x Posted April 5, 2012 Report Share Posted April 5, 2012 Hi Chris Photos are a great help. Do you know the tube diameter at the silencer end of the tapered outlet. I am about to fabricate the tail pipe. Kind regards Martin Quote Link to comment Share on other sites More sharing options...
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