Author Topic: Help with Surfrider ID  (Read 1321 times)

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Offline Old BS Guy

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Help with Surfrider ID
« on: November 01, 2015, 10:55:23 PM »
Need some community help with a serial number. Picked up a blue 90 today with a Surfrider tank badge. The riveted vin plate reads, "Surfrider, and model BS-90M, so I have to assume it's a BS90 Mountain. The serial # is 20039026. It's non-injected, so again, I'm guessing '65-'66. Below it reads Rockford Scooter Co. Ltd.... Since this doesn't fit the mold for the usual vin decoding for model, month, year, can someone straighten me out. This thing has been on an abandoned ranch in the Idaho mountains for close to 30 years. The engine is free, and has good compression. It still has the dual sprockets and all the hard mechanical intact. I'll post pics tomorrow. Any help is appreciated.
'69 Mach II RS, '67 350 GTR, '66 Sport 90 o.i., '65 90M Surf Rider, '68 100 Trail, '71 100 TMX ,'79 Honda CBX, '82 Yam 650 Turbo, '74 Norton 850 Hi-Rider, '70 Triumph 500 Trophy, '75 Suz. GT-380.

Offline disc_valve

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Re: Help with Surfrider ID
« Reply #1 on: November 02, 2015, 10:38:05 AM »
Hi, again,

I'll confess to knowing very little about Surfriders, but I understand that they were just re-badged Bridgestones. So your beast would bea re-badged 90 Mountain, but there is something strange about the serial number for a non-injected BS90. A sertial number starting with "20" indicates a BS100 Sport, and if you take the third character of the serial as a "Q", note a zero, that fits in nicely with the serial sequence for a BS100 Sport, but the 100 Sport was an Oil Injection model.  If you are taking your serial number from the plate on the frame, has somebody swapped the frame (or just the serial plate) at some time in the bike's life? If the whole frame has been swapped, you should see evidence of an oil tank mounting on the right hand side of the frame.

The only other possibility is the BS100 SR racer, which used a 100cc motor (thus serials starting "20") but came from the factory without the oil injection system. The 100SR is a bit rare, and I know even less about them myself - there are other members on this site who are founts of knowledge about the BS Racers. Perhaps one of them could add few pointers.

Finally, a picture of the bike might help to establish its provenance.

Graham
« Last Edit: November 05, 2015, 06:37:38 AM by disc_valve »

Offline Old BS Guy

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Re: Help with Surfrider ID
« Reply #2 on: November 02, 2015, 11:40:16 AM »
Thanks, Graham. I'm working on pictures to post today. The one thing I haven't looked at yet is the engine number. More to follow.
'69 Mach II RS, '67 350 GTR, '66 Sport 90 o.i., '65 90M Surf Rider, '68 100 Trail, '71 100 TMX ,'79 Honda CBX, '82 Yam 650 Turbo, '74 Norton 850 Hi-Rider, '70 Triumph 500 Trophy, '75 Suz. GT-380.

 


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