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spark plug query

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dave cullen
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spark plug query

#1 PostAuthor: dave cullen » Sat Sep 01, 2018 6:37 pm

If you find your bike is fouling up a wee bit after prolonged low speed running in town or traffic and you don't do a lot of high speed stuff, would it be worth dropping down a grade of plug, eg B8ES to B7ES??
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Charlie
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Re: spark plug query

#2 PostAuthor: Charlie » Sat Sep 01, 2018 6:50 pm

It should not be fouling up. You might want to check your fueling and carb settings
Why do I persist in debating with idiots ? I really should know better :)

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Re: spark plug query

#3 PostAuthor: compo z1r » Sat Sep 01, 2018 7:22 pm

dave cullen wrote:If you find your bike is fouling up a wee bit after prolonged low speed running in town or traffic and you don't do a lot of high speed stuff, would it be worth dropping down a grade of plug, eg B8ES to B7ES??


take Charlie's sound advice or u may well as drop down from semi synthetic to fry crisp and dry and from super 97 to 2 star :shock:
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Re: spark plug query

#4 PostAuthor: dave cullen » Sat Sep 01, 2018 8:55 pm

yeh,

This is all a bit odd, as I have posted before re my ELR, I got a refurbed set of carbs from Wired George in the states, the bike is running brilliantly on the motorway, and A roads, and it had a good dyno run, but it just does not like getting stuck in traffic, and it's fouling up, I AM running it on super unleaded to try and stave off ethanol storage problems, maybe I should go back to regular unleaded for a bit?

I really don't want to have more workshop time, so I can put up with it, was just a thought re the plugs

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Re: spark plug query

#5 PostAuthor: compo z1r » Sat Sep 01, 2018 9:04 pm

dave cullen wrote:yeh,

This is all a bit odd, as I have posted before re my ELR, I got a refurbed set of carbs from Wired George in the states, the bike is running brilliantly on the motorway, and A roads, and it had a good dyno run, but it just does not like getting stuck in traffic, and it's fouling up, I AM running it on super unleaded to try and stave off ethanol storage problems, maybe I should go back to regular unleaded for a bit?

I really don't want to have more workshop time, so I can put up with it, was just a thought re the plugs

Dave


dave what u running pods or standard air box ?
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Re: spark plug query

#6 PostAuthor: zed1015 » Sat Sep 01, 2018 9:50 pm

Over fueling on the low end.
Try weakening the mix slightly with the air screws.

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Re: spark plug query

#7 PostAuthor: dave cullen » Sun Sep 02, 2018 8:16 am

standard air box,
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Re: spark plug query

#8 PostAuthor: dave cullen » Sun Sep 02, 2018 8:17 am

zed1015 wrote:Over fueling on the low end.
Try weakening the mix slightly with the air screws.


thanks, will do some tweaking in due course
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Re: spark plug query

#9 PostAuthor: compo z1r » Sun Sep 02, 2018 9:37 am

dave cullen wrote:
zed1015 wrote:Over fueling on the low end.
Try weakening the mix slightly with the air screws.


thanks, will do some tweaking in due course


rob's correct but one of the things ive done in the past is use a less restrictive filter k&n or better and drilled the air box then set up with a colour tune had it spot on ? but not on a elr box :D
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Re: spark plug query

#10 PostAuthor: ZedHead » Sun Sep 02, 2018 12:20 pm

Spark Plugs for Classic Engines.pdf
(57.5 KiB) Downloaded 37 times
dave cullen wrote:If you find your bike is fouling up a wee bit after prolonged low speed running in town or traffic and you don't do a lot of high speed stuff, would it be worth dropping down a grade of plug, eg B8ES to B7ES??


Yes!

This is the advice from NGK... read attached

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Re: spark plug query

#11 PostAuthor: warren3200gt » Sun Sep 02, 2018 12:49 pm

7's are hotter than 8's. They run better at lower speeds. KHI changed from 8 to 7 after the first year on 650's.
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Re: spark plug query

#12 PostAuthor: dave cullen » Sun Sep 02, 2018 5:41 pm

I think i am going to try dropping the plugs to B7's, i got a dyno print out for new carbs and it was great i am told. When i was on run friday, it ran great but previously i got stuck in a big jam and it fouled up. Will report back thanks guys
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Re: spark plug query

#13 PostAuthor: King of Kings » Mon Sep 03, 2018 11:48 pm

Possibly try a set of Brisk plugs, though nowt wrong with dropping to B7s, as per the workshop manual :)

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Re: spark plug query

#14 PostAuthor: Big Fluff » Tue Sep 04, 2018 3:50 pm

Sounds like it's running too advanced ignition... i.e retard not functioning etc.
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