smelling123 Posted June 7, 2014 Report Share Posted June 7, 2014 Im renovating my 199b (which I haven't ridden yet) and Im finding some slight anomalies. The piston has been fitted without the con-rod spacers - this means the rod is floating at the big end and little end (!). I can remedy this but I am confused when looking at the transfer ducst in the crank case - these do not match the barrel and look more like motocross ducts than what I 'd have expected on a trials engine. Se picture on the link below. https://www.flickr.com/photos/76022002@N08/14179459579/ Any ideas? Have I inherited some pursang cases? The flywheel is the large type and the primary chain is single row so everything else seems to be Sherpa. It has 6 gears. Any clues folks?? 1 Quote Link to comment Share on other sites More sharing options...
bult360 Posted June 7, 2014 Report Share Posted June 7, 2014 Hi Stu , they look like pursang ducts will txt you pics of standard 199a cases and pursang case and pursang cylinder Quote Link to comment Share on other sites More sharing options...
smelling123 Posted June 7, 2014 Author Report Share Posted June 7, 2014 cheers Pat, thanks for the info. Quote Link to comment Share on other sites More sharing options...
woody Posted June 7, 2014 Report Share Posted June 7, 2014 They've been modified by smoothing them out, helps them rev a bit more I think. In smoothing them out like that it also means a little metal is lost from the edges so they end up a little oversize. Normally the cylinder would be matched to them. My modified 199b is similar as is a mate's 199a that he recently stripped for a rebuild. Standard Ossa MAR ducts are like that Quote Link to comment Share on other sites More sharing options...
ady Posted June 17, 2014 Report Share Posted June 17, 2014 I've seen the same cases used on the 198B,I think at this late stage Bultaco were using any parts they had available to assemble bikes,they are pursang or frontera cases but you will find they have the correct numbers on them. Quote Link to comment Share on other sites More sharing options...
smelling123 Posted June 18, 2014 Author Report Share Posted June 18, 2014 Thanks All Quote Link to comment Share on other sites More sharing options...
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