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Old 16-05-2011, 03:55 PM
BigBod BigBod is offline
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Default Might be aquiring an old 1951 Brit Bike..

Never had one before. It's a runner apparently but only just! The oldest bike I've ever had before is 1980, so what fuel do I run an old Brit bike on? Do I have to use some kind of additive?

Gonna be a whole new learning curve this....
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Old 16-05-2011, 04:20 PM
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I was advised by the then editor of Classic Bike Guide and now Real Classics to just run my '52 BSA on plain unleaded - 'the head's s'posed to come of every 3000 miles to have the valves re-lapped in, how long do you think it's likely to take you to do 3000 miles?'

I ran mine on unleaded and it was fine.
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Old 16-05-2011, 04:28 PM
wurzel wurzel is offline
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My Grandad used to be a mechanic on bikes for a road racer (i think he raced enfields) anyway he told me all engines designed early post war run fine on unleaded as Lead was too rare to put decent amounts in petrol and engines were designed for the poor fuel / poor machining tolerances. He had a rover P60 which he ran on unleaded with no problems - it was his sole means of transport other than bike from the late 60's onwards
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Old 16-05-2011, 05:24 PM
johnr johnr is offline
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ive a few bsa's and i run em on unleaded with no bother. when they ditched the lead in fuel there was a lot of talk about valve seat regression, and it is a problem, but tbh i wouldnt go to the bother of rebuilding it just for them, as they will run quite merrily for thousands of miles before they need attention. what is it exactly that you are getting? 2 stroke or 4, ohv or sidevalve?
my 53 bsa sidevalve will run on pretty much any fuel i put in it, i got some fuel from a mate whos mrs had put petrol in her diesel land rover, and ran my bsa on it for hundreds and hundreds of miles, it ran just as well as on petrol!
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Old 16-05-2011, 05:27 PM
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and you might want to save this site in your faves,

http://www.classicbikeforum.co.uk/index.php
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Old 16-05-2011, 06:16 PM
PeteHaddock PeteHaddock is offline
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as everyone else has said, unleaded will be fine and if you use "super" unleaded thats about half way between modern fuel and old 4 star as its around 95 octane and 4* was about 98 octane i think??
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Old 16-05-2011, 07:24 PM
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Because most of us oldies who rode 1950s bikes never had enough money to run a 3.6 ltr open top Bentley tourer we used to buy the cheapest petrol on the forecourt, preferably filled for us by a topless girl pump attendant..then it was a rush to use the petrol before the local godsquad put pressure on the council to make the girls put their tops back on...

John.
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Old 16-05-2011, 07:39 PM
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its not the octane rating that you need, the lead in leaded petrol was what was needed to lube the valve seats, but i wouldnt worry about anything like that, just put unleaded fuel in it and enjoy it till it breaks!!
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Old 16-05-2011, 08:24 PM
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As John says, octane rating is noting to do with lead. Different octanes give different burn rates, prevent pre-combustion on high performance engines etc.

Should be good to run on standard fuel.
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Old 17-05-2011, 08:20 AM
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A lot of money has been made by various companies doing unleaded conversions.
And to be honest unless you intend to race the bike then leave it alone. okay they sometimes benefit from an ignition timing alteration.
but unleaded conversions belong up there with the millenium bug...
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Old 17-05-2011, 08:26 AM
BigBod BigBod is offline
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Thanks guys, thats put my mind at rest, won't be doing many miles on it anyhow. Its a 1951 Vincent Comet....not quite a done deal yet but I will find out this week.
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Old 17-05-2011, 05:03 PM
johnr johnr is offline
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grrrrrrr, tell us that you payed 100 quid for it and half this forum will hunt you down!!!!!
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Old 17-05-2011, 08:59 PM
BigBod BigBod is offline
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Quote:
Originally Posted by johnr View Post
grrrrrrr, tell us that you payed 100 quid for it and half this forum will hunt you down!!!!!
It's a long story, but if it comes off it will have cost the grand sum of 30 quid!

Not going to count my chickens yet...This sort of thing just doesn't happen to me..
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Old 17-05-2011, 09:51 PM
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Quote:
Originally Posted by BigBod View Post
It's a long story, but if it comes off it will have cost the grand sum of 30 quid!
I'm gonna have to kill you...

John.
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Old 18-05-2011, 08:01 AM
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Let me know where ye live once John has killed you I will come round and offer to ease the burden by removing the cause of your demise namely an old motorbike ..of course I would offer financial compensation of a few quid .....cos bikes aint really worth that mauch ye know and what with all the laws now about having to deal with scrap in an envirnmentally friendly way .......
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Old 18-05-2011, 04:57 PM
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Quote:
Originally Posted by BigBod View Post
Never had one before. It's a runner apparently but only just! The oldest bike I've ever had before is 1980, so what fuel do I run an old Brit bike on? Do I have to use some kind of additive?

Gonna be a whole new learning curve this....
runs on:
Hope,
a couple of gallons (imperial) of hope,
loyalty
&
slow fading memories of empire,

&
of course,
torque,
big fucking grins,
conversations: 'I 'ad one o' those when I were a lad'
'is that the turner pre unit
or
did you know that in the War'
etc.
hours of tinkerin'
hours of:
should I restore it,
just the run/rip the shit right out of it
'its actually alright/fun innit'

& on.
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Old 18-05-2011, 07:25 PM
johnr johnr is offline
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Quote:
Originally Posted by BigBod View Post
It's a long story, but if it comes off it will have cost the grand sum of 30 quid!

Not going to count my chickens yet...This sort of thing just doesn't happen to me..

kids,



fetch ma gun!!!


jammy get!!!


photos when you get it though!!!
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