Author Topic: carb setup after rebuild  (Read 1277 times)

Offline chaz

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carb setup after rebuild
« on: 12.07. 2012 21:33 »
having just rebuilt a 6 50 twin motor with twin carbs , fishing for ideas or feelings with regards to setting up after a complete strip down. is it best to stick to service manual carb settings or jet up or down to run the engine in.?
allways willing to learn
United Kingdom

Online bsa-bill

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Re: carb setup after rebuild
« Reply #1 on: 13.07. 2012 10:53 »
I'm no expert Chaz and still have a bit of tinkering to do on my Rocket carb to get a reliable tickover ( probably never going to be as good as the Flash)

However today's fuel does seem to result in a rich looking plug - sooty but that could be additives
So I would think you should be safe enough with factory settings for running in, if worried lift the needle a notch and screw the pilot jet in just a tad for the first run then check.
More experienced Amalites will probably give you the benefit of their findings
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 muskrat

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Re: carb setup after rebuild
« Reply #2 on: 13.07. 2012 21:42 »
 G'day chaz, a new motor does like to be a bit rich to run in. The easiest way is to lift the float height a mm or two, easy with the new stay up floats. That will richen it across the range. Then drop'em back down after a few hundred miles.
 I used an old bowl plug with a small tube fitting and clear hose to test the height, and marked the bowl with high and low marks.
http://www.amalcarb.co.uk/TechnicalDetail.aspx?id=14
 Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
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Offline chaz

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Re: carb setup after rebuild
« Reply #3 on: 13.07. 2012 23:00 »
thanks for that, both. its running a bit rich at the moment so will probably leave it then.
allways willing to learn
United Kingdom

Offline muskrat

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Re: carb setup after rebuild
« Reply #4 on: 14.07. 2012 02:30 »
 Having just re-built it the plugs will look sooty till the rings bed in.
Cheers
'51 A7 plunger, '57 A7SS racer now a A10CR, '78 XT500, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7