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71 Cruiser wiring

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71 Cruiser wiring

Post  Malcolm33 on Sat Oct 11, 2014 6:46 am

Hello to you all I am new to the forum, I have a 71 cruiser which I am trying to get it back running and was wondering if anyone could point me to a wiring diagram to cover this bike
thanks Malcolm

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Cruiser 71 instruction manual

Post  FB vincent on Thu Oct 23, 2014 8:02 am

The FB Instruction Manual will contain a wiring diagram. The following offer a manual for the Cruiser 75, which will almost certainly have the same wiring as the 71. Or have you contacted the FBOC librarian?

http://www.british-motorcycle-parts.com/Francis_Barnett_motorcycle_manuals.htm

Sandy Ross (no connection with this vendor)

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Re: 71 Cruiser wiring

Post  Kim on Thu Oct 23, 2014 8:54 am

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Re: 71 Cruiser wiring

Post  fulmar88 on Thu Oct 23, 2014 9:22 am

Just a point of caution having read the posts in the link above. It doesn't state exactly which 225 Cruiser that wiring diagram was taken from. As JH said in the thread Falcons of that period (1954) were positive earth. However the later Falcon 81 (1958-59) was negative earth. Is it possible that the wiring diagram shown is from a Cruiser 75 and was negative earth but the earlier Cruiser 71 was positive earth?? Clarification of the publication source of the wiring diagram would be helpful. To help identify it some (most) FB instruction manuals have one or two letters on the front cover (bottom right usually) which states year and sometimes model also. Assuming they used all letters I think 'V' is 1954.

regards,
Steve.
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Re: 71 Cruiser wiring

Post  Jack Clegg on Thu Oct 23, 2014 9:41 am

V is 1955.
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Re: 71 Cruiser wiring

Post  Kim on Thu Oct 23, 2014 9:46 am

The 225 engine is the 1h and presumably the negative earth is common to all 1h engines. The book it came from has the letters UB on the right, bottom of the cover but is just labeled "Instruction manual for Cruiser" and on the inside it states "225 Cruiser"


Last edited by Kim on Thu Oct 23, 2014 9:54 am; edited 1 time in total
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Re: 71 Cruiser wiring

Post  fulmar88 on Thu Oct 23, 2014 9:50 am

Jack Clegg wrote:V is 1955.

Thanks Jack. I was counting back from A (my bike, June 1959). As I suspected they didn't use all letters. Looks like X was missed out. We had seen evidence before suggesting X was used for prototype or eXperimental bikes.
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Re: 71 Cruiser wiring

Post  fulmar88 on Thu Oct 23, 2014 9:54 am

Kim wrote:The 225 engine is the 1h and presumably the negative earth is common to all 1h engines. The book it came from has the letters UB on the right, bottom of the cover

On that basis and with U being 1954 I'm sure you are correct and the diagram shown was correct for the bike in question. I just thought it was worth asking to avoid any issues for the opening poster.
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X frame numbers

Post  piston 197 on Thu Oct 23, 2014 11:29 am

X was used on bikes as a frame No, the 2 works trials bikes and the ISDT one I have all have frame numbers beginning with X, although one is 1952, one 1953 and one was originally a 1952 rigid that was re-framed in 1955 !
presumably X was only used on FB's own bikes as I have also come across a Plover in standard trim , first registered to Francis and Barnett Ltd with an X frame No, this was presumably a work's hack as it had no competition pretensions ?

John H
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Re: 71 Cruiser wiring

Post  fulmar88 on Thu Oct 23, 2014 11:46 am

I have checked all of the Coventry cancelled registration index cards for 1936. Of the 7 bikes registered by Francis and Barnett during 1936 two had an X in the frame number. I guess it could signify prototype, works, non-standard, or hack and therefore not to be sold? We will never know, but it seems that the previous use of X meant that it wasn't used as a year identifier when its turn came along in 1957.
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frame Nos

Post  piston 197 on Thu Oct 23, 2014 11:55 am

Yes no "X" identifier for year or "Q" for that matter, "K" finished at the beginning of the war for 1940 models and post war models recommenced with "L" so nothing for 1941 to 45 either as the production of fuses and military hardware for the war effort was of a greater need.
JH
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Re: 71 Cruiser wiring

Post  Malcolm33 on Thu Oct 23, 2014 7:07 pm

Thanks for all the replies the manual I have sadly had the page misssing but I have since found another and it is a negative earth the code on the front page is WB for reference and th bike was registered end of January 1955. I will try to get a phot of the diagram uploaded to here if I can work out how to help anyone else. Thanks again and I am sure I'll be back as I try to get it registered and on the road.

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Re: 71 Cruiser wiring

Post  Malcolm33 on Thu Oct 23, 2014 7:26 pm

I found some clues to putting up the image and hope this is a link to the diagram in the instruction manual I now have
IMG]http://i61.tinypic.com/2dlrmhe.jpg[/IMG

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Re: 71 Cruiser wiring

Post  alf barnett on Sun Oct 26, 2014 7:17 pm

fulmar88 wrote:Just a point of caution having read the posts in the link above. It doesn't state exactly which 225 Cruiser that wiring diagram was taken from. As JH said in the thread Falcons of that period (1954) were positive earth. However the later Falcon 81 (1958-59) was negative earth. Is it possible that the wiring diagram shown is from a Cruiser 75 and was negative earth but the earlier Cruiser 71 was positive earth?? Clarification of the publication source of the wiring diagram would be helpful. To help identify it some (most) FB instruction manuals have one or two letters on the front cover (bottom right usually) which states year and sometimes model also. Assuming they used all letters I think 'V' is 1954.

regards,
Steve.
so is my 81 falcon (1961 amc)positive or negative earth.if negative it would explain why the resister wire gets hot as the bike came positive earth
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falcon 81

Post  piston 197 on Sun Oct 26, 2014 7:21 pm

If it is 1961 and AMC engine suggest it is a Falcon 87 ?? the 81 has the Villiers engine ( 10E) and is 1958/59 only model ?
JH
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Re: 71 Cruiser wiring

Post  alf barnett on Sun Oct 26, 2014 9:13 pm

piston 197 wrote:If it is 1961 and AMC engine suggest it is a Falcon 87 ?? the 81 has the Villiers engine ( 10E) and is 1958/59 only model ?
JH
sorry john it is an 87 falcon amc 197cc
it old age creeping up
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Re: 71 Cruiser wiring

Post  alf barnett on Tue Oct 28, 2014 8:42 am

alf barnett wrote:
piston 197 wrote:If it is 1961 and AMC engine suggest it is a Falcon 87 ?? the 81 has the Villiers engine ( 10E) and is 1958/59 only model ?
JH
sorry john it is an 87 falcon amc 197cc
it old age creeping up

but i,m still not sure if it,s - or + earth for my falcon 87..i,ve not run my bike since i found the resister wire got hot without the lights on ??????
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Wipac electrical system Falcon 87

Post  FB vincent on Tue Oct 28, 2014 4:42 pm

alf barnett wrote:
alf barnett wrote:
piston 197 wrote:If it is 1961 and AMC engine suggest it is a Falcon 87 ?? the 81 has the Villiers engine ( 10E) and is 1958/59 only model ?
JH
sorry john it is an 87 falcon amc 197cc
it old age creeping up

but i,m still not sure if it,s - or + earth for my falcon 87..i,ve not run my bike since i found the resister wire got hot without the lights on ??????

The Wipac electrical system is positive earth. The resistance wire is only cut in when the headlight is off. The system is complicated, the coils being brought into circuit to meet the load. You need to look at a wiring diagram - I am sure the SEARCH function will bring up several threads for this system which was used on the Falcon 87 and Cruiser 80/84 (and many other AMC engined 2 and 4 stroke bikes of the period). If properly maintained, the Wipac system will cope with the full load with no problem even at low engine speeds. Sandy Ross

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Re: 71 Cruiser wiring

Post  alf barnett on Thu Oct 30, 2014 9:10 am

thank you sandy.that explains to some degree that everything maybe ok with my 87 falcon..
eg the resister wire gets hot when the bike is running with no lights on.
but once the headlamp is on the wire cools down straight away.
i,ve only run the bike up the backs a few times over the years and the amp metre works as i would expect (same as my c15 one does)
I just thought more 87 owners would have noticed this resister wire getting hot.
i suppose that,s why the wires in it,s own sheath and not binded into the main loom.
thanks again...alf........................
ps has anyone got a photo of the original air filter of the falcon 87.as mines got a bantam d7 amal filter on and i,d like to keep my eyes open for the original whilst out and about at auto jumbles........
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Falcon 87 air cleaner

Post  FB vincent on Thu Oct 30, 2014 5:01 pm

alf barnett wrote:thank you sandy.that explains to some degree that everything maybe ok with my 87 falcon..
eg the resister wire gets hot when the bike is running with no lights on.
but once the headlamp is on the wire cools down straight away.
i,ve only run the bike up the backs a few times over the years and the amp metre works as i would expect (same as my c15 one does)
I just thought more 87 owners would have noticed this resister wire getting hot.
i suppose that,s why the wires in it,s own sheath and not binded into the main loom.
thanks again...alf........................
ps has anyone got a photo of the original air filter of the falcon 87.as mines got a bantam d7 amal filter on and i,d like to keep my eyes open for the original whilst out and about at auto jumbles........

If you look at the last photo in the thread http://fboc.niceboards.org/t3012-rectifier-position?highlight=rectifier
you will see the correct air filter. The key feature of the AMC Falcon air cleaner is that the inlet to the carb is not positioned centrally in the air cleaner, the offset being required to clear the coil. The dimensions are 4 1/2" od x 2 7/8" long. The air inlet to the carb is 2" od over the clamp. Sandy Ross



http://fboc.niceboards.org/t3012-rectifier-position?ghlight=rectifier

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Re: 71 Cruiser wiring

Post  alf barnett on Fri Oct 31, 2014 8:28 am

thanks for that sandy Laughing
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Re: 71 Cruiser wiring

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