bultaco model ?

[rusty nuts]

33 minutes ago, lorenzo said:

As others have already pointed out, it's a bitsa.

I can see parts from several different models there.........don't let that put you off, as it doesn't make it any less rideable or enjoyable.

However, if the serial no. stamped on the frame headstock is the same as the engine it's a re-stamp.......

I've  got a 175 sherpa t knowing my luck they made 361 mines number 500 ?

[section swept]

No matter what it is the bike looks to be in relatively good shape and as you say you like it, so that’s a good thing. So what if the engine and frame numbers don’t match, it has an engine that works and a frame that is in god shape. 

I think you have a 158 frame which might have left the factory with a 325 engine in it and at some stage another engine has been put in. But you must bear in mind that around the 60’s and early 70’s it was the done thing for dealers to have two or more bikes of the same type and model, then remove both engines and swap them about. This meant that purchase tax was avoided as the none matching numbers allowed the dealer to declare them a kit form bike. This is just to indicate how you might end up with what you’ve got. The RM letters at the front of your engine number indicate R = 238cc engine capacity M = Motor and then numerals for production quantity. The 158 has a frame just as you have, it was the revised version of the M80 with additional side brace frame tubes. The letter R was introduced about 1973 when Bultaco started changing engine capacities to meet worldly demands etc so there will be engines with different capacities identified by a letter in front of the M. But that doesn’t stop people fitting different length conrod and pistons and barrels to increase or decrease engine cc. So the 1980 part of the engine number is the model and not s year designation, it’s an engine from a 198 whatever. 

Finish rebuilding/restoring it and enjoy, and as already mentioned earlier contact Dave Renham at Bultaco UK In Motion who will no doubt be able to help or point you at someone who can? Or go to Google and type in identify my Bultaco which should get you to Team Bultaco. 

Edited July 19, 2018 by section swept

[rusty nuts]

19 minutes ago, section swept said:

No matter what it is the bike looks to be in relatively good shape and as you say you like it, so that’s a good thing. So what if the engine and frame numbers don’t match, it has an engine that works and a frame that is in god shape. 

I think you have a 158 frame which might have left the factory with a 325 engine in it and at some stage another engine has been put in. But you must bear in mind that around the 60’s and early 70’s it was the done thing for dealers to have two or more bikes of the same type and model, then remove both engines and swap them about. This meant that purchase tax was avoided as the none matching numbers allowed the dealer to declare them a kit form bike. This is just to indicate how you might end up with what you’ve got. The RM letters at the front of your engine number indicate R = 238cc engine capacity M = Motor and then numerals for production quantity. The 158 has a frame just as you have, it was the revised version of the M80 with additional side brace frame tubes. The letter R was introduced about 1973 when Bultaco started changing engine capacities to meet worldly demands etc so there will be engines with different capacities identified by a letter in front of the M. But that doesn’t stop people fitting different length conrod and pistons and barrels to increase or decrease engine cc. So the 1980 part of the engine number is the model and not s year designation, it’s an engine from a 198 whatever. 

Finish rebuilding/restoring it and enjoy, and as already mentioned earlier contact Dave Renham at Bultaco UK In Motion who will no doubt be able to help or point you at someone who can? Or go to Google and type in identify my Bultaco which should get you to Team Bultaco. 

what a mind of infomaton thats very much aprecated. can't win them all ? but frame numbers don't win twin shock competitions either haha ??

[rusty nuts]

30 minutes ago, section swept said:

No matter what it is the bike looks to be in relatively good shape and as you say you like it, so that’s a good thing. So what if the engine and frame numbers don’t match, it has an engine that works and a frame that is in god shape. 

I think you have a 158 frame which might have left the factory with a 325 engine in it and at some stage another engine has been put in. But you must bear in mind that around the 60’s and early 70’s it was the done thing for dealers to have two or more bikes of the same type and model, then remove both engines and swap them about. This meant that purchase tax was avoided as the none matching numbers allowed the dealer to declare them a kit form bike. This is just to indicate how you might end up with what you’ve got. The RM letters at the front of your engine number indicate R = 238cc engine capacity M = Motor and then numerals for production quantity. The 158 has a frame just as you have, it was the revised version of the M80 with additional side brace frame tubes. The letter R was introduced about 1973 when Bultaco started changing engine capacities to meet worldly demands etc so there will be engines with different capacities identified by a letter in front of the M. But that doesn’t stop people fitting different length conrod and pistons and barrels to increase or decrease engine cc. So the 1980 part of the engine number is the model and not s year designation, it’s an engine from a 198 whatever. 

Finish rebuilding/restoring it and enjoy, and as already mentioned earlier contact Dave Renham at Bultaco UK In Motion who will no doubt be able to help or point you at someone who can? Or go to Google and type in identify my Bultaco which should get you to Team Bultaco. 

And I believe interbreeding is healthy other wise end up with buckled wheels and slow engine ??

[stevem75]

I’d say the frame is earlier than 158.  I’d guess 124.  The give away is the gusseting at the headstock and the tube that runs from the upper frame tube to the bottom (right where the 158-159 airbox would go). As well if this was a later model frame than 158 then the swing arm and rear motor mount would have been separate pieces.  None the less still a good solid bike to be out riding on!!

steve 

[rusty nuts]

1 hour ago, stevem75 said:

I’d say the frame is earlier than 158.  I’d guess 124.  The give away is the gusseting at the headstock and the tube that runs from the upper frame tube to the bottom (right where the 158-159 airbox would go). As well if this was a later model frame than 158 then the swing arm and rear motor mount would have been separate pieces.  None the less still a good solid bike to be out riding on!!

steve 

God above it will be first flat tanker bultaco frame at this rate original engine 3hp . be doing London to Brighton ?

[rusty nuts]

5 minutes ago, rusty nuts said:

God above it will be first flat tanker bultaco frame at this rate original engine 3hp . be doing London to Brighton ?

if you have any spare wick for lights get intouch ?

[rusty nuts]

10 minutes ago, rusty nuts said:

God above it will be first flat tanker bultaco frame at this rate original engine 3hp . be doing London to Brighton ?

what is difference with this after market exhaust on the machine expansion box much difference? 

[fourex]

It looks like a Sammy Miller Products muffler from years ago, I don't know if they were good, bad or indifferent.

 

PS: Rusty Nuts, I get the impression you only want to hear what you "want to hear".  Most of the info provided so far, you could have found yourself ! Please don't be condescending to people trying to assist you.

Edited July 20, 2018 by fourex
PS added.

[section swept]

17 hours ago, rusty nuts said:

God above it will be first flat tanker bultaco frame at this rate original engine 3hp . be doing London to Brighton ?

Ah now there’s a thought, rip out the antiquated chain drive, install a riveted leather belt with oversize rear wheel pulley. Slap an armchair where the saddle fits and a red candle complete with rustic candle holder to the rear ( not too close to the seat...elf an safety) oh and a white candle between the forks. We could all do our own Lundinium to Brighton run, sidecars accepted too. Anyone who owns a Bultaco Cultivator could enter as well obviously they have to accept the fact that they may have to walk there and back! If we ditched the spark plug and used the candle for ignition we could well meet that suggested 3hp?? Bread and gruel stops at the midway point.

Edited July 20, 2018 by section swept

[woody]

22 hours ago, section swept said:

 

I think you have a 158 frame which might have left the factory with a 325 engine in it and at some stage another engine has been put in.

Just wondering why you think that.?  

The frame is probably an M91/92 series 2 but could be a 124/125 or 150/151  (250 and 325 from that era are the same visually so can't be told apart) Definitely not 158.  The forks are M92 as is the chrome exhaust (which will bolt straight onto a 250 engine from '75 onwards)

 

[section swept]

I’ve had a better look around the headstock, not just at the welds and frame number and guess what? In the same area as that G stamp I have the number 4 stamped in! Was this a way of the factory identifying which worker did what frame or was it an inspection stamp. Either way it’s intriging and now I to want to know what these extra marks are....now where’s that Mr. Miller??

[rusty nuts]

I think your quite right as a welder my self I am some times required to stamp a traceable stamp Mark to my jobs in case of any problems . it's an old practice so yes I belive your keen eye for detail is correct ??

[rusty nuts]

On 19/07/2018 at 4:42 PM, rusty nuts said:

God above it will be first flat tanker bultaco frame at this rate original engine 3hp . be doing London to Brighton ?

thanks for that I'm thinking may be welding process on bultacos might be a give away my later 175  has been mig welded  and this one seems to be very crude gas or tig welded only an idea on how might give dates on some frames ?

[rusty nuts]

On 20/07/2018 at 5:45 AM, fourex said:

It looks like a Sammy Miller Products muffler from years ago, I don't know if they were good, bad or indifferent.

 

PS: Rusty Nuts, I get the impression you only want to hear what you "want to hear".  Most of the info provided so far, you could have found yourself ! Please don't be condescending to people trying to assist you.

thanks for infomation  if I'm not sure I ask .so many of these frames look very similar I'm not a bultaco specialist archivist . would you rather have options of experience or trust your inexperienced eye ? I'm great full for any help . As far as hearing what I want to hear!  would I be taking the p*** out my own bike if I was that close minded to professionals advice  . No would be the answer