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Engine Numbers #375238
05/25/11 5:54 pm
05/25/11 5:54 pm
Joined: Apr 2011
Posts: 163
NYC
D
djg42 Offline OP
BritBike Forum member
djg42  Offline OP
BritBike Forum member
D
Joined: Apr 2011
Posts: 163
NYC
Hello,
On my engine it says 71-1033. I cant find a number on the frame, near the handlebars on the right side where I would expect to see a frame number its stamped "Laughing Madness" Whatever that is...
Any idea what this engine number means and why theres no frame number? I believe my bike is a 1970 Lightning.

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Re: Engine Numbers [Re: djg42] #375243
05/25/11 6:22 pm
05/25/11 6:22 pm
Joined: Aug 2001
Posts: 3,348
Michigan, USA
BONZO R.I.P. Offline
In Remembrance
BONZO R.I.P.  Offline
In Remembrance
Joined: Aug 2001
Posts: 3,348
Michigan, USA
A few things that will tell you real quick if your bike is a '70 or not would be the swingarm, there should be a solid shaft with bronze and steel bushing rather than the earlier tube with rubber bush . Then there are the two tubes welded to the headstock for a fairing mount . If you have both of these it is a '70, the numbers should be stamped on a squared off lug on the drive side front motor mount .

FWIW-BONZO

Re: Engine Numbers [Re: djg42] #375294
05/25/11 9:19 pm
05/25/11 9:19 pm
Joined: Jun 2002
Posts: 9,965
Scotland
S
Stuart Offline
BritBike Forum member
Stuart  Offline
BritBike Forum member
S
Joined: Jun 2002
Posts: 9,965
Scotland
Hi,

Originally Posted By: djg42
On my engine it says 71-1033.

That looks more like a part number. What part of the engine is it on?

By 1970, I believe engine numbers are similar to Triumphs - stamped on a raised area ('pad') of the left-hand crankcase just below the block?

Hth.

Regards,

Re: Engine Numbers [Re: djg42] #375341
05/26/11 12:40 am
05/26/11 12:40 am
Joined: Jan 2006
Posts: 1,936
Maryland
JD Online happy

Moto-Amish
JD  Online Happy

Moto-Amish
Joined: Jan 2006
Posts: 1,936
Maryland
Stuart's right, the serial number can be found here on a 1970 A65 engine:


Josh

Moderated by  Allan Gill, Jon W. Whitley 


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