Author Topic: Fuel issues  (Read 2284 times)

Offline CheeserBeezer

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Re: Fuel issues
« Reply #45 on: 07.09. 2024 17:11 »
Hi BSA500. Seen this loads of times recently! The white stuff is generally referred to as 'crud' !

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Re: Fuel issues
« Reply #46 on: 07.09. 2024 17:46 »
BSA the white stuff is because of moisture reacting with the zinc in the carb . edit ,,   forgot to mention the dreaded moisture absorbing ethanol doesn't help at all.

Offline BSA500

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Re: Fuel issues
« Reply #47 on: 07.09. 2024 19:03 »
Of course the ethanol. Like a chemical bath sponge. Well let's just say Thursday in weather terms was rather 'moist' at least the mag etc was unaffected. Looks likely some of that crud was in the pilot circuit.

1960 A7 (57 motor to SS spec)

Offline limeyrob

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Re: Fuel issues
« Reply #48 on: 07.09. 2024 19:57 »
I think ethanol in fuel has a lot to answer for.  Its surprisingly reactive and seems to attack quite a lot of materials and absorbing water just adds another element.  When they upped the ethanol in diesel (which they keep quiet about) my Land Rover injection pump turned into a sieve with leaks everywhere.
On my A10 the Concentric pilot circuit was solid and nothing would budge it. I drilled the fixed jet out, tapped the carb body and fitted the earlier threaded jet so I can now poke it though.
Slough 59 GF/SR

Offline RGS Chris

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Re: Fuel issues
« Reply #49 on: 14.09. 2024 05:43 »
I always turn the petrol taps off before arriving home and allow the engine to run untill the carbs empty out. this prevents crud from drying out in the pilot Jet. Seems to work so far.
Sydney 58/60 RGS rep

Offline muskrat

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Re: Fuel issues
« Reply #50 on: 14.09. 2024 07:04 »
G'day Fellas.
Australia the lucky country. Two grades of fuel with zero ethanol! 95 & 98 I use in everything plus octane boost to 107 plus Stabil ( https://tinyurl.com/5a6kw7kp ) and a bit 1:500 castrol R to keep it fresh for a year. Fill the tank today, good to go when I want (even in the lawn mower).
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

Offline RGS Chris

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Re: Fuel issues
« Reply #51 on: 17.09. 2024 11:15 »
 The Stabil looks interesting, I wonder how it would go with a tank that's been sealed.
Some tank sealing products recommend not to use Lucas stabilizer as it reacts with the tank sealer. 
Sydney 58/60 RGS rep

Offline muskrat

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Re: Fuel issues
« Reply #52 on: 18.09. 2024 20:23 »
G'day Chris.
The plunger tank is lined with KBS and no problems (yet!).
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