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Cyl Head Gasket


paulmac
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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.

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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.

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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) :-

BultacoPursangMk9Cylinderheadgaskets-top250bottom370.jpg

(I'm unable to photo the Sherpa ones at the moment, but they are very similar.)

Edited by Lorenzo
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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 :

BultacoPursangMk9Cylinderheadgaskets-top250bottom370.jpg

(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

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