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  #1  
Old 25th June 2017, 05:49 PM
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chopper chopper is offline
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Biker.ie Member No. 1841 from Fuck knows
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Default 1970 bsa b25s engine build pics

i said id post a few pics of this so....
the little b25 had been lying up most of its life , the engine was a bit clattery when i got it , a lot of b25 "experts" thought it sounded ok but i had a feeling there was too much noise. it sounded a bit too much like big end wear.
i had about 60 miles up on it after servicing ,cleaning carb and points etc getting it running and it started a right racket while it was flying along .
first off a few pics of stripping it down .
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  #2  
Old 25th June 2017, 05:54 PM
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Default Re: 1970 bsa b25s engine build pics

ill add more infp after getting the pics up . more pics of stripping the engine .pic with micro bearing puller is just to show this can be done if the bsa tool is not readily got. as can be seen it was fairly mank inside and the big end was toast .
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  #3  
Old 25th June 2017, 06:00 PM
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Default Re: 1970 bsa b25s engine build pics

more pics of stripping .note hairline crack in oil pump , the pump was harder to turn than it should have been .the seal for the end fed crank was not great either, this may have contributed to the demise of the big end but it might have had the crap rode out of it in the states before it came here. hard to know for sure.
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  #4  
Old 25th June 2017, 06:14 PM
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Default Re: 1970 bsa b25s engine build pics

i went -.020 on the shells , stripped the crank down and got the journal ground to suit the shells , polished up the crank and rod , new drive side and timing side bearings .lots of new clutch parts, bearing and bushes for the gearbox etc ...
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Last edited by chopper; 25th June 2017 at 06:16 PM.
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  #5  
Old 25th June 2017, 06:16 PM
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fingy fingy is offline
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Motorbike: honda tlm220 bsa c15t sherco 290 bmw r65 yamaha xt225 scorpa 250 ducati pantah
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Default Re: 1970 bsa b25s engine build pics

I have a C15T from the states bet its not a lot better inside,,,
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  #6  
Old 25th June 2017, 06:24 PM
dePeatrick dePeatrick is offline
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Default Re: 1970 bsa b25s engine build pics

Some job! great pics btw :)
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  #7  
Old 25th June 2017, 06:34 PM
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Default Re: 1970 bsa b25s engine build pics

new gaskets all round , barrel honed, new rings , piston cleaned up and hotspot areas in the design rounded out. rebuilt second hand oil pump , valves ground , port cleaned up a bit .timed up , new points , new oil pressure switch etc etc . ill get a vid of it running in a while . ive been taking it handy while running it in but its a bit of fun riding it around , think ive about 300 miles or so on it since .its a bit rough looking on the outside but the motors as good as if not better than new. oilway on crank was opened a bit and the detent in crank for oil to sit dremmeled as per rupert ratios book on the subject .
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  #8  
Old 25th June 2017, 06:42 PM
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by fingy View Post
I have a C15T from the states bet its not a lot better inside,,,
very similar engines and a lot of the b25 parts can be used to upgrade the c15t. yours is like the earlier version of the design .
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  #9  
Old 25th June 2017, 06:56 PM
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Default Re: 1970 bsa b25s engine build pics

out for a spin last jan . pic makes it look a lot better than it is but that said its an original survivor , not something you see a lot of these days . the mrs loves it , brings us back to the days when we were on 250s all the time . ya cant stop anywhere without someone coming over to talk about it .
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  #10  
Old 25th June 2017, 07:16 PM
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choppermann choppermann is offline
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by chopper View Post
new gaskets all round , barrel honed, new rings , piston cleaned up and hotspot areas in the design rounded out. rebuilt second hand oil pump , valves ground , port cleaned up a bit .timed up , new points , new oil pressure switch etc etc . ill get a vid of it running in a while . ive been taking it handy while running it in but its a bit of fun riding it around , think ive about 300 miles or so on it since .its a bit rough looking on the outside but the motors as good as if not better than new. oilway on crank was opened a bit and the detent in crank for oil to sit dremmeled as per rupert ratios book on the subject .


Fuck me your really turning into an old anorak.
lovely little yoke all the same.
nice job on the rebuild , if only I could borrow yer brain for some of my crap

Last edited by choppermann; 25th June 2017 at 07:17 PM.
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  #11  
Old 25th June 2017, 07:23 PM
speedy joe speedy joe is offline
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Motorbike: 61 bsa road rocket,
Default Re: 1970 bsa b25s engine build pics

Nice to see another survivor and more so you enjoying it, great crack off these little engines, a lot of negative stuff written about c15s and their variations but for their time they were near enough to any other bike that you paid the same money for. back in the day I remember stripping my c15ss to fit a new set of rings and if I kissed it couldn't get it to fire after reassembly, after a lot of head scratching I discovered I had fitted the pushrods upright instead of criss cross,btw any remedy for releasing clutch plates that are stuck together after a long lay up, have tried serious bumping.
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  #12  
Old 25th June 2017, 10:24 PM
faz1 faz1 is offline
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by chopper View Post
out for a spin last jan . pic makes it look a lot better than it is but that said its an original survivor , not something you see a lot of these days . the mrs loves it , brings us back to the days when we were on 250s all the time . ya cant stop anywhere without someone coming over to talk about it .


it looks lovely there, something different
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  #13  
Old 26th June 2017, 12:36 PM
knightrider knightrider is offline
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Default Re: 1970 bsa b25s engine build pics

That's some work well done. Would love to have the ingenuity for that and time
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  #14  
Old 26th June 2017, 01:54 PM
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Biker.ie Member No. 1841 from Fuck knows
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Default Re: 1970 bsa b25s engine build pics

If theres any interest ill do a few more brit engine build thread .ive folders of pics from over the years .t120/t140,t100r ,trw 500 ,b33 etc .hapes of jap stuff too but id find the jap stuff a bit boring .
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  #15  
Old 26th June 2017, 04:33 PM
Valiant Thor
Default Re: 1970 bsa b25s engine build pics

savage work done there
must bring back a few fond memories being out on her
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  #16  
Old 26th June 2017, 05:58 PM
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SoulX SoulX is offline
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by speedy joe View Post
btw any remedy for releasing clutch plates that are stuck together after a long lay up, have tried serious bumping.
I usually bump start and drive around with the clutch pulled.That normally frees them up.In extreme cases you'll have to pull it apart and separate them by hand.

@Chop,does that engine have the eccentric valve adjusters?Weird set up if you don't know about it
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  #17  
Old 26th June 2017, 06:07 PM
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bonzoid bonzoid is offline
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by Vjmc.Cork View Post

@Chop,does that engine have the eccentric valve adjusters?Weird set up if you don't know about it
Thought that set-up was only on the Gold Stars?....
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  #18  
Old 26th June 2017, 06:24 PM
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SoulX SoulX is offline
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Default Re: 1970 bsa b25s engine build pics

Originally Posted by bonzoid View Post
Thought that set-up was only on the Gold Stars?....
I had an old Triumph 250 with a bsa engine that had that set up.
It was some kind of C15 unit.
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  #19  
Old 26th June 2017, 07:14 PM
chopper's Avatar
chopper chopper is offline
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Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 1841 from Fuck knows
53,987 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Default Re: 1970 bsa b25s engine build pics

Originally Posted by Vjmc.Cork View Post
I usually bump start and drive around with the clutch pulled.That normally frees them up.In extreme cases you'll have to pull it apart and separate them by hand.

@Chop,does that engine have the eccentric valve adjusters?Weird set up if you don't know about it
Yea it does .great idea and works a treat .
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  #20  
Old 26th June 2017, 07:15 PM
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Original Poster of This Thread Topic Starter
 
Biker.ie Member No. 1841 from Fuck knows
53,987 posts since May 2005
My Motorcycle Pics Motorbike: jap brit and euro
Default Re: 1970 bsa b25s engine build pics

Originally Posted by Vjmc.Cork View Post
I had an old Triumph 250 with a bsa engine that had that set up.
It was some kind of C15 unit.
Tr25w the triumph badged bsa b25 :-) .same engine frame etc .
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