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#193202 - 11/08/04 10:35 pm A65 transmission gear ratios  
Joined: Nov 2004
Posts: 2
tom root Offline
BritBike Forum
tom root  Offline
BritBike Forum

Joined: Nov 2004
Posts: 2
My neighbor has 3 BSAs all mid to late 60s, 1 running, 1 rebuildable and one parts. He's asked me to see if there were different gear ratios available in the transmissions. He's a rider and insists that the low gear in his running bike is too high and the high gear is too low; he redlines at about 80. Could the transmission have been rebuilt with improper gears somewhere in the past? Is this a common or correctable problem?

Myself, in the middle 70s had somekind of BSA that must have been patched together before I bought it. It had the red plastic gas tank and metal side covers, it had (from photos elsewhere on the web) an A50 engine (one bbl AMAL with smooth top heads.) I was told it was a 500cc hornet. Short high rise bars and twin Lucas tach and speedometer. It may have been an A65 that a mechanic had put a 500 engine into. Is that possible? Anyway I miss it. Good luck with your forum. I'm a slant 6 man myself these days, but I retain that motorcycle designation on my driver's license ' cause you never know. My neighbor thanks you in advance.

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#193203 - 11/08/04 11:41 pm Re: A65 transmission gear ratios  
Joined: Nov 2004
Posts: 2
tom root Offline
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tom root  Offline
BritBike Forum

Joined: Nov 2004
Posts: 2
I forgot to say that all three motorcycles are 650s, twin carb, chrome gas tanks. My neighbor says the transmission gears are all close ratio, i.e. there's not much change in the ratio from one to the next. If he changed the sprockets to fix the low gear problem, he'd max out at 70mph. Or if he fixed the top end, he'd always stall in first or burn up the clutch. Hope I'm being clear. Thanks for any help. We're in Georgia, usa.

#193204 - 11/11/04 11:49 am Re: A65 transmission gear ratios  
Joined: Aug 2001
Posts: 1,869
Alan_nc Online content
Alan_nc  Online Content


Joined: Aug 2001
Posts: 1,869
Greensboro, NC
Tom,

Yes the bikes are geared very low. We usually fix this by changing the sprockets on the chain. More teeth on the front sprocket (20,21) less teeth on the rear.

Works fine and is fairly cheap.

Alan


Alan
Cleared m out....left only
59 BSA Bantam (Trials)
78 Triumph Bonny (UPS)
02 Suzuki GS500

Moderated by  Richrd 


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