The BSA A7-A10 Forum
Technical (Descriptive Topic Titles - Stay on Topic) => Amal, Carburation, Fuel => Topic started by: diggerjones on 10.08. 2014 20:31
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hi all, i have a ss 500 engine in a golden flash a10. its ran ok for a few months, but recently its let me down.
it dose'nt start as it did but dose start, and then after a few miles it misses abit then maybe 1/2 later it stops. it dose'nt do this all the time. pretty sure it fuel as it has electric ignition.
so the problem i think is the carb. one thing i have noticed is the fuel coming out of the tickler has lots of bubles in it. i have had carb to bits and cleaned and tightened everything up.
any ideas
thanks dylan
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pretty sure it fuel as it has electric ignition.
You're joking, aren't you!
My first guess is that the battery voltage is too low for the electronic ignition. Stick a multimeter across the battery terminals.
But it's only a guess and doesn't address the cause of the voltage being low. Tell us how many volts the battery holds and how long it will keep the headlamp shining with engine stopped.
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I agree TT. Sounds like my non charging A7, when the battery is low any use of electrical equipment (horn, brake light) cuts the motor. The Boyer blurb says they'll run as low as 9v, rubbish, at 11v it starts advancing the timing causing starting to be a bit difficult.
Cheers
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Really weird, but had a similar problem today...!
Bike equipped with a Pazon ignition, it suddenly dropped dead. Luckily I remembered 2 things; firstly, I changed from NGK #8 plugs to #6 yesterday, and secondly, I ran the bike about 1/2 mile at very low speed and left it idling for about 5 minutes.
When she stalled I tried to restart her, but she kept on backfiring, and refused to start. I left her to cool down for 10 minutes, and she started fine after that, but the problem reoccurred after about 2 miles at low speed. She never did this before on the #8 plugs so I guessed she was running a bit hot and thus pre-igniting. I had a set of spare #8 plugs with me, so I put them in, problem solved. Rest of the journey no more problem.
Maybe worthwhile to try a set of cooler plugs? Or retarding ignition a tad?
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when it runs it runs well, i;ve had the problem with the low powered battery before and it would miss then soon stop and would not go again till you charged up again.
i always try the head light befor i go anywhere and its bright and dose'nt dim when brake light is put on.
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Condenser/capacitor..?
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First check is to look into the tank, to see if it contains fuel.
There are gauze strainers on the fuel tap and inside the carburettor banjo. They get choked.
There is a breather hole in the fuel filler cap, which can get blocked.
Some petrol taps just don't flow enough.
Simple test for a fuel flow problem-
Take the main jet cover off the bottom of the carburettor.
Open the fuel tap and let it drain into a jar.
If it flows 600ml in a minute, you don't have a problem with fuel flow.
But check that the breather hole in the filler cap is clear anyway.
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i might be the only person this has happened to but when cleaning the carb did you check the tickler was not blocked, the tickler has an air hole that acts as a breather for the fuel bowl. The air hole is quite small and on mine was blocked by an insect, which caused the engine to start, then die, and flood a fair bit as well.
Cleaning it is simple.....might ge worth a check.
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ok, will check all these things out. should there be air bubles in the fuel coming out of tickler
cheers
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I don't think it matters, whether it looks bubbly or not.
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thanks
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well sorted *smiley4*
you were all right *sad2*
i was convinced it was fuel and had disregarded the electric side. anyway tonight checked batery and all was fine. checked the spark, very good.
started it up and it run not very good and stopped after a minute or 2.
checked spark and none there. so we are on to something.
the ht leads from the electric ignition seemed loose, found the problem.
so when i thought it was fuel i messed with the tickler and the fuel dripped onto ht leads and made it worse.
been out on it tonight and seems to be running ok.
thanks for everybodys help.
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heres a pic from 4 years ago
(https://www.a7a10.net/forum/proxy.php?request=http%3A%2F%2Fi775.photobucket.com%2Falbums%2Fyy37%2Fdiggerjones%2FIMG_1396.jpg&hash=634df97adfcf4fb1eda046f36e70d13444d45430)
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By the looks on the young fella's face, you'll be fighting him for a ride in a couple of years... *smile* *wink2*
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ha ha thats not me or my kids.
my kid is in the mrs belly in the pic and the dogs are mine.
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In that case.... keep a eye on the little bloke ... He's got a EVIL GRIN... >:D
I bet he's thinking about knocking off ya bike... *wave*
*eek* & that cat is going to Pi$$ on ya wheels... *rant*
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ha ha that cat is me dog. its a jack russel. and the evil kid is 6 or 7 now and still lives accross the road..