Author Topic: Breather?  (Read 575 times)

Offline BSAA10

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Breather?
« on: 07.02. 2016 05:55 »
What is the tube coming from the top of the engine? some sort of breather? Should it be filtered?

Offline trevinoz

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Re: Breather?
« Reply #1 on: 07.02. 2016 21:06 »
Which tube would that be?

Online bsa-bill

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Re: Breather?
« Reply #2 on: 07.02. 2016 21:12 »
only tube I can think of is the oil feed to the rockers  definitely not a breather
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Offline Rocket Racer

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Re: Breather?
« Reply #3 on: 07.02. 2016 22:47 »
The webco rocker box covers typically include a breather fitting. My exhaust side standard cover has been modified to be my outlet breather so does go to a breather bottle and runs via a Bunn oneway valve (out only).
But as standard A10's just have the one timed breather on the drive side behind the cam as previously pictured in this thread.
So any further breathers would be non standard mods for the go-fast brigade
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline BSAA10

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Re: Breather?
« Reply #4 on: 08.02. 2016 00:06 »
Yes it appears to be a fitting with length of hose from the rear rocker cover. Should the hose go to any particular place? This is a standard A10 Super Rocket. Thanks

Online bsa-bill

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Re: Breather?
« Reply #5 on: 08.02. 2016 09:34 »
yes rocker breather - I've always wondered why, if there's excess pressure up there it's surely coming from somewhere it shouldn't or am I missing something?
All the best - Bill
1961 Flash - stock, reliable, steady, fantastic for shopping
1959 Rocket Gold Flash - blinged and tarted up  would have seizure if taken to  Tesco

Online chaterlea25

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Re: Breather?
« Reply #6 on: 08.02. 2016 12:57 »
Hi All,
THe original timed breather is designed to create a partial vacuum within the engine cases
Adding another open breather does away with the vacuum effect
as Bill says
Quote
if there's excess pressure up there it's surely coming from somewhere it shouldn't

The standard breather works very well once correctly set up

all the breathers in existance wont make up for engine problems

John
1961 Super Rocket
1963 RGS (ongoing)