paulmac Posted February 12, 2012 Report Share Posted February 12, 2012 A dumb question maybe - should a 198b have a Cyl Head Gasket - just rebuilding mine for the first time and it dosn't have one?? Paul Mac Quote Link to comment Share on other sites More sharing options...
bullylover Posted February 13, 2012 Report Share Posted February 13, 2012 Gidday Paul. No, the later Sherpas don`t have a head gasket in them, they use the top of the barrel liner sitting in a hollow in the head to seal. Bully Lover. Quote Link to comment Share on other sites More sharing options...
paulmac Posted February 13, 2012 Author Report Share Posted February 13, 2012 Gidday Paul. No, the later Sherpas don`t have a head gasket in them, they use the top of the barrel liner sitting in a hollow in the head to seal. Bully Lover. Thanks mate Paul Mac Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 13, 2012 Report Share Posted February 13, 2012 Thanks mate Paul Mac My M198 came with a copper head gasket. It was the first time I had ever seen a head gasket on a Bultaco and assumed it was standard. What's the go? Is it meant to have it? Quote Link to comment Share on other sites More sharing options...
bullylover Posted February 13, 2012 Report Share Posted February 13, 2012 Hello Feetupfun, I am not sure on the 198`s as I have never had one apart. I know the 158`s and the 182`s all had no head gasket. All the Pursangs from the MK 4 250`s did not have one either. There was a few that had one but I am not sure which ones. If it has the liner protruding from the barrel and a channel in the head then it does not use a head gasket. The 198`s were at the starts of Bultaco`s troubles so they might of been mixing and matching parts by then. I owned a 199 A in the early eighties which I could never buy rings for. It was not until the early 2000`s that a friend restored my old one and found out it was a 340. It should have been a 326. So yours having a head gasket does not surprise me one little bit David. Bully Lover. Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 13, 2012 Report Share Posted February 13, 2012 Hello Feetupfun, I am not sure on the 198`s as I have never had one apart. I know the 158`s and the 182`s all had no head gasket. All the Pursangs from the MK 4 250`s did not have one either. There was a few that had one but I am not sure which ones. If it has the liner protruding from the barrel and a channel in the head then it does not use a head gasket. The 198`s were at the starts of Bultaco`s troubles so they might of been mixing and matching parts by then. I owned a 199 A in the early eighties which I could never buy rings for. It was not until the early 2000`s that a friend restored my old one and found out it was a 340. It should have been a 326. So yours having a head gasket does not surprise me one little bit David. Bully Lover. Yes my M198 head has no recess and the sleeve end is flush with the barrel. Quote Link to comment Share on other sites More sharing options...
paulmac Posted February 13, 2012 Author Report Share Posted February 13, 2012 (edited) quote name='feetupfun' timestamp='1329122480' post='294467'] Yes my M198 head has no recess and the sleeve end is flush with the bar Mine has the recess so thanks all. Paul Mac Edited February 13, 2012 by paulmac Quote Link to comment Share on other sites More sharing options...
lorenzo Posted February 14, 2012 Report Share Posted February 14, 2012 (edited) Isn't it true that Bultaco used solid copper cyl. head gaskets across the range for a short time? I can confirm that (at least) Pursang Mk. 9 250 & 370 and Sherpa models 198 & 199 had gaskets as standard, as I have some. They were not included in OE gasket sets for these bikes, either. However, as I am unable to access my parts info. at the moment I cannot say when they were phased out; my 199B has a spigoted head joint just like the Bulto engines of old. It's conceivable therefore that a model 198 had a gasket, "A" and/or "B" variants did not. To give you an idea, here are some Pursang gaskets (250 top, 370 below) :- (I'm unable to photo the Sherpa ones at the moment, but they are very similar.) Edited February 15, 2012 by Lorenzo Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 14, 2012 Report Share Posted February 14, 2012 Isn't it true that Bultaco used solid copper cyl. head gaskets across the range for a short time? I can confirm that (at least) Pursang Mk. 9 250 & 370 and Sherpa models 198 & 199 had gaskets as standard, as I have some. However, as I am unable to access my parts info. at the moment I cannot say when they were phased out; my 199B has a spigoted head joint just like the Bulto engines of old. It's conceivable therefore that a model 198 had a gasket, "A" and/or "B" variants did not. To give you an idea, here are some Pursang gaskets : (I'm unable to photo the Sherpa ones at the moment, but they are very similar.) My M198 gasket appears the same shape as the upper gaskets in the photo - ie both the inner and outer edges make full circles Quote Link to comment Share on other sites More sharing options...
bullylover Posted February 15, 2012 Report Share Posted February 15, 2012 Hello all. In the last two years I have had a 91,151,158,199,199A,199B,116,194,120,121 and an El Bandito apart and the only the El Bandito had a head gasket. It is starting to look like it is pot luck whether you get a head gasket or not.Bully Lover. Quote Link to comment Share on other sites More sharing options...
john collins Posted February 20, 2012 Report Share Posted February 20, 2012 One of the problems with engine numbers is that they can often not always tell you if anything other than the crankcase has been changed or messed about with As someone has already stated Quote Link to comment Share on other sites More sharing options...
paulmac Posted February 20, 2012 Author Report Share Posted February 20, 2012 One of the problems with engine numbers is that they can often not always tell you if anything other than the crankcase has been changed or messed about with As someone has already stated Quote Link to comment Share on other sites More sharing options...
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