bulltaco340 Posted August 26, 2014 Report Share Posted August 26, 2014 Hi, Could someone advise please, are 199a and 199b cylinder heads a straight swap?. Quote Link to comment Share on other sites More sharing options...
pschrauber Posted August 26, 2014 Report Share Posted August 26, 2014 Haven't tried ... but: - the 199b had has no cylinder gasket, the 199a has a thick copper gasket. - the 199b has a 85mm bore, the 199a has 83,2mm. Quote Link to comment Share on other sites More sharing options...
bondy Posted August 26, 2014 Report Share Posted August 26, 2014 the copper gaskets like these. Quote Link to comment Share on other sites More sharing options...
bondy Posted August 26, 2014 Report Share Posted August 26, 2014 the 199A and 199B won't fit each other has pschrauber says. the 199B has a raised barrel and locks into the head into a groove the 199A is a flat face on barrel and head. Quote Link to comment Share on other sites More sharing options...
bulltaco340 Posted August 27, 2014 Author Report Share Posted August 27, 2014 (edited) Thanks for that guys, I've been offered a 340 motor without a head. After reading your replies I managed to find some exploded diagrams and it looks like the 340 head is a 325 head with a relief machined to take the 340 liner. Can anyone confirm this please?. In fact, it looks like the 1975/76 type 350 sherpa head has the same relief?. Edited August 27, 2014 by bulltaco340 Quote Link to comment Share on other sites More sharing options...
bondy Posted August 27, 2014 Report Share Posted August 27, 2014 am not sure on that 1 mate but i do think some off the 325 (350) did have the same groove in the head if so they may fit the 340 if not i should think it would be hard to find a 340 head on it's own. i have a 350 spare engine 199A but it wont fit a 340 all the 350 engines iv'e had have all been the same. with the copper head gasket iver come across 1 with out. unless it was the early 350 that had the raised barrel. is the 340 motor to put into a 199B frame? or just as a spare? Quote Link to comment Share on other sites More sharing options...
bulltaco340 Posted August 28, 2014 Author Report Share Posted August 28, 2014 A bit of both bondy, I've got a spare 199a without an engine and thought I might play around building a modified bike over the winter. I wonder if anyone has contact details for John Collins who has (or used to have) a trials used spares business?. Quote Link to comment Share on other sites More sharing options...
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