Author Topic: Spark plugs  (Read 1138 times)

Offline BSA500

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Spark plugs
« on: 16.05. 2018 10:57 »
Recommend me some sparks plugs please

Offline BSA500

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Re: Spark plugs
« Reply #1 on: 16.05. 2018 16:42 »
Sorry forgot the most important points. A7 with alloy head manu 1957 8:1 pistons. Mine eats the cheap NGKs from ebay surprise  :!

Offline berger

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Re: Spark plugs
« Reply #2 on: 16.05. 2018 18:39 »
i have not been to the pub, ive been using NGK B7ES and B8ES for ages with high comp pistons and skimmed head no problems....BUT not from FLEABAY , mines alloy head A7 also

Offline BSA500

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Re: Spark plugs
« Reply #3 on: 16.05. 2018 19:59 »
I have been using b6es but from ebay *sad2*

Offline Seabee

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Re: Spark plugs
« Reply #4 on: 16.05. 2018 20:36 »
Mine foul NGk's too. Champions seem to last forever?!
1961 Super Rocket
1957 Road Rocket
2009 Harley Electra Glide Classic
1993 Harley Springer Softtail
1970 Harley Sportster Chopper
1982 Yamaha XT550
2001 KTM EXC 400
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Southern Illinois, USA

Offline berger

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Re: Spark plugs
« Reply #5 on: 16.05. 2018 21:17 »
what do you mean by eats them, that is the question burnt out/ fouling etc.  and I would think a B6ES is a bit hot and I know nothing about fish, but I am going to the pub friday

Online muskrat

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Re: Spark plugs
« Reply #6 on: 16.05. 2018 21:25 »
I use nothing but NGK even when racing. B7 or 8ES in the Cafe and B7ES in the Plunger (alloy head). If you only ride down to the shop & back run a hotter plug than you would if burning up the highway.
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
Australia
Muskys Plunger A7

Offline BSA500

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Re: Spark plugs
« Reply #7 on: 16.05. 2018 21:29 »
I think its a question of where to buy quality plugs from. Some sort of guarantee that they are well made to the correct standard. Maybe the green spark plug company???

Offline Flashgreubon

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Re: Spark plugs
« Reply #8 on: 16.05. 2018 21:36 »
Hi there,
 I threw away two boxes of  10 new NGK's : faulty out of the box, breaking down when hot or stopping altogether after one or two  days.
 Missed a sale because of them, guys came for test ride, bike fully serviced, went home and could not start it : you guessed : another f...ckd up NGK.
 Trying to start my model H last week, lovely spark,myself puffed up and still no start. Had an old 1920's 18mm plug lying around : started 1st kick.
 Champions for me anyday

Offline worntorn

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Re: Spark plugs
« Reply #9 on: 16.05. 2018 22:45 »
I bought some EBay NGKs in 2 boxes of ten, separate purchases, different vendors.
Used them for a few years with ok results then read about fake NGKs
Went to the NGK website and got the critical facts.
My eBay plugs are all fakes.
For fun, I checked for any resistance between terminal and tip. There shouldn't be any.
Their resistance values were all over the map.
Quite a number were open circuit.
I threw all of the eBay plugs out and ordered some Champions.
I'm also using some NGKs from Napa auto. They are authentic. And zero resistance

Glen

Online duTch

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Re: Spark plugs
« Reply #10 on: 16.05. 2018 22:51 »

 I tried B8ES, B7ES, BP6 7 & 8ES, and I think some Champions and Bosch, but seems to like B6ES best so save the long nose ones for the GuTzzi
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
Australia

Offline morris

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Re: Spark plugs
« Reply #11 on: 17.05. 2018 09:44 »
NGK B6HS from a reputable dealer for me. Absolutely zero issues on the magneto equipped  plunger or electronic ignition swing arm. I just change them as a matter of precaution every 2 years or so.
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Offline BSA_54A10

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Re: Spark plugs
« Reply #12 on: 17.05. 2018 10:40 »
I use BP's in everything as they tend to stay cleaner for longer having to projecting electrode.
Now here is the rub.
New NGK plugs have no glaze on the insulation 9 Some sort of EPA regulations ) so once they get fouled they stay that way unless you burn off the deposits.
Wire brushing leaves a conductive path down the 1/3 end of the insulator that is exposed.
Modern "fuel" is not petrol and is highly conductive at cylinder pressures and sparking voltages . If the plug is not hot enough to burn off these deposits it will go bad and can only be recovered by burning off.
NGK's heat ranges are a lot tighter than a Champion.
Most Champions span 3 to 5 NGK heat ranges and 3 Bosh heat ranges.
Champions do have glaze on their insulators so are less prone to cold fouling.

As such a bike fitted with Champions might just fire after 20 or so kicks from cold where as a bike fitted with NGK's  will have fouled plugs after 3 or 4 kicks.
So the rule I use is to run the carb dry if I have been on the bike for less than 1/2 hour.
Longer than that & I can use the decompressor without worry.

As to the quality of standard spark plugs.
I get BP NGK's for $ 2.00, wholeslale.
The wholesaler runs at a 100% mark up so they are paying $ 1.00 a plug, delivered.
They order through a distributor who also gets a cut of that $ 1.00
The boxes cost 3¢ ( single plug ) the cartons 5¢ ( 10 plugs ) and the shipping box $ 2.00 ( 200 plugs )

So how much profit per plug does a spark plug company make ? 1¢ , 2¢.
Whatever it is it can not be much so the quality of standard almost no profit plugs will always be dubious.
I go through around 400 plugs a year and am yet to get one bad out of the box.
Two strokes get Champions because of their greater resistance to cold fouling while four stokes get NGK's cause they run better.
Bike Beesa
Trevor

Offline BSA500

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Re: Spark plugs
« Reply #13 on: 17.05. 2018 12:56 »
I use BP's in everything as they tend to stay cleaner for longer having to projecting electrode.
Now here is the rub.
New NGK plugs have no glaze on the insulation 9 Some sort of EPA regulations ) so once they get fouled they stay that way unless you burn off the deposits.
Wire brushing leaves a conductive path down the 1/3 end of the insulator that is exposed.
Modern "fuel" is not petrol and is highly conductive at cylinder pressures and sparking voltages . If the plug is not hot enough to burn off these deposits it will go bad and can only be recovered by burning off.
NGK's heat ranges are a lot tighter than a Champion.
Most Champions span 3 to 5 NGK heat ranges and 3 Bosh heat ranges.
Champions do have glaze on their insulators so are less prone to cold fouling.

As such a bike fitted with Champions might just fire after 20 or so kicks from cold where as a bike fitted with NGK's  will have fouled plugs after 3 or 4 kicks.
So the rule I use is to run the carb dry if I have been on the bike for less than 1/2 hour.
Longer than that & I can use the decompressor without worry.




As to the quality of standard spark plugs.
I get BP NGK's for $ 2.00, wholeslale.
The wholesaler runs at a 100% mark up so they are paying $ 1.00 a plug, delivered.
They order through a distributor who also gets a cut of that $ 1.00
The boxes cost 3¢ ( single plug ) the cartons 5¢ ( 10 plugs ) and the shipping box $ 2.00 ( 200 plugs )

So how much profit per plug does a spark plug company make ? 1¢ , 2¢.
Whatever it is it can not be much so the quality of standard almost no profit plugs will always be dubious.
I go through around 400 plugs a year and am yet to get one bad out of the box.
Two strokes get Champions because of their greater resistance to cold fouling while four stokes get NGK's cause they run better.

From what you said the champions might be my best bet. Glazed and a quite forgiving heat range. As I am not sure what exact plug to go for as a lot of people seem to change the 'recommended' grade as they don't suit their engines. So what is the champion plug I need for an alloy headed A7 running on 95 octane unleaded. Typically traveling 13 miles each way to work down and around country lanes.

Offline berger

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Re: Spark plugs
« Reply #14 on: 17.05. 2018 13:33 »
well you could try champion L85 which is very similar to NGK 6 range *dunno* see how you go