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BSA B25ss engine Any good ?
#814565 06/30/20 5:04 pm
Joined: Apr 2015
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Hi guys

i hope you are keeping well

i have opportunity to get Bsa B25 engine are they any good for trials . pros and con for trials please

what is difference in SS or normal BSA 25 engine :-)

i want to put in royal enfield crusader frame since it is very light .

Regards
BJ

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Re: BSA B25ss engine Any good ?
bsa_junkman #814581 06/30/20 7:31 pm
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You’d be better with a C15 or B40 Motor. The B25 is a very revy engine, geared down a lot might be ok, but if your wanting something that will plod through then the C15 or B40 motor will be best.

The B25SS Models were the oif engines, beefier cases, better oil pumps (same as the wdb40 I believe) just generally a better engine.

If your ever over in the Isle of Man whilst the MGP is on, spend the weekend (the second weekend after race week) and watch the classic trial. They run the side cars that weekend too and the modern gas gas outfits compete directly against the classics.... as far as the outfits go the vintage stuff cuts it much easier.

I’m “slowly” doing a Trials myself, after having a go on a trials bantam and finding how well it handled I’ve decided I’ll do one of those myself.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: BSA B25ss engine Any good ?
bsa_junkman #814586 06/30/20 7:40 pm
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Thanks Allan for your reply ...

I am new to trials as well . i thought i have few bits lying may be get engine. and build something .. specially these days
we need some distraction, i will plan something for Isle of Man,

Regards
BJ

Re: BSA B25ss engine Any good ?
bsa_junkman #814599 06/30/20 9:17 pm
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If it's very affordable, you could always buy it and put it to the test.


Jon W.


1957 6T Thunderbird 650
1968 T100R Daytona 500
1971 TR6R Tiger 650
1970 BSA A65F 650
1955 Tiger 100 - Project
1971 BSA A65 650 - Project
1972 Norton Commando 750 "Combat"


"Every time I listen to AC/DC, so do my neighbors"

Re: BSA B25ss engine Any good ?
bsa_junkman #814620 06/30/20 11:40 pm
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Hi Jon W Whitley

it is bit of wrecked engine. many rusted bits.. crankcase, crank piston, con rod and piston/gearbox bits ..not complete as such
trying to get cheap under hundred.euro. , cannot post pictures .. it may offend owner.

i dream everyday of british bikes,

Regards
BJ

Last edited by bsa_junkman; 06/30/20 11:42 pm.
Re: BSA B25ss engine Any good ?
bsa_junkman #814625 07/01/20 12:19 am
Joined: Nov 2011
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Michael Waller has great videos on Youtube on building B25 Trials bikes here: https://www.youtube.com/watch?v=aekA028QVLg&t=629s or here: https://www.youtube.com/watch?v=aekA028QVLg&list=PL-f-b3vlEx-xuG5ZGyDvs3Tt7aUYl9gOf

Nothing wrong with B25 motor as a trials bike. B25SS should be late model, 1971 or later, which has better con rod, and cylinder, head, and rocker box have wider flanges for better support. The late model ones have a wider rear mounting flange on the motor to fit the OIF frames, but that shouldn't stop you from making a nice custom trials bike.

Tom

Last edited by koncretekid; 07/01/20 12:22 am.

Life's uncertain - go fast now!
1 member likes this: bsa_junkman
Re: BSA B25ss engine Any good ?
bsa_junkman #814649 07/01/20 9:15 am
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Thanks Tom for your valuable feedback

i am fan of Michael Waller work. he build some nice bikes ..

Regards
BJ

Last edited by bsa_junkman; 07/01/20 9:16 am.

Moderated by  Allan G, Jon W. Whitley 

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