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November 20, 2014, 11:07:19 PM

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Author Topic: High Idle Speed  (Read 415 times)

JoeSchmofo

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Re: High Idle Speed
« Reply #15 on: November 11, 2014, 03:08:05 PM »
Thanks Steve, I'm going to pull the plug out tomorrow morning to see what that'll tell me....

These short days mean I have no time for tinkering.

JoeSchmofo

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Re: High Idle Speed
« Reply #16 on: November 12, 2014, 06:50:56 PM »
Here's my spark plug. It's obviously running too rich and will be going back to the dealer.

crock

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Re: High Idle Speed
« Reply #17 on: November 12, 2014, 09:28:25 PM »
After years of running dyno tests and doing plug chops, i am not on board with the idea that reading the plugs gives you any indication of the air/fuel ratio. You can have cars/bikes running A/F of 12:1 with white plugs and 15:1 with black sooty plugs. My conclusion was that the plug reacts to temperature more than anything else.

gremlin

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Re: High Idle Speed
« Reply #18 on: November 12, 2014, 09:47:18 PM »
........ My conclusion was that the plug reacts to temperature more than anything else.

I'm right there with ya!
1996 Trophy 1200
2011 RE B5
1979 XS11 w/vetter terraplane
1981 XS11 streetfighter
1983 Venture Royale
1982 CB750K
1971 Triumph Trident
1969 CB450
1966 Sears (puch) 250


gashousegorilla

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Re: High Idle Speed
« Reply #19 on: November 13, 2014, 12:50:45 AM »
Here's my spark plug. It's obviously running too rich and will be going back to the dealer.

   That plug looks like the bike was idling for a while and or slow speed riding.  And the motor didn't get very hot for very long.
An thaibhsí atá rattling ag an doras agus tá sé an diabhal sa chathaoir.

Arizoni

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Re: High Idle Speed
« Reply #20 on: November 13, 2014, 01:51:17 AM »
That spark plug looks like it's been run on an engine with a plugged air filter.

It's really carboned up so badly I'm surprised the engine was running.

If I was wondering why, I'd check to see if the paper air filter wasn't covered with oil before I did anything else.
Jim
2011 G5 Deluxe
1999 Miata 10th Anniversary

JoeSchmofo

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Re: High Idle Speed
« Reply #21 on: November 13, 2014, 12:23:17 PM »
   That plug looks like the bike was idling for a while and or slow speed riding.  And the motor didn't get very hot for very long.
....definately not the case, beleive me.

I'll check the air filter tomorrow.

SteveThackery

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Re: High Idle Speed
« Reply #22 on: November 13, 2014, 09:56:33 PM »
My conclusion was that the plug reacts to temperature more than anything else.

Of course!  You are spot on - that is what the colour of the plug tells you.  A rich mixture makes the plug run too cold (blackish), and weak mixture makes it run too hot (whiteish).  But you can also make the plug black or white just by installing the wrong temperature-range plug.  An excessively cold-running plug (short heat path) will run black, even when the mixture is spot on.  Ditto with a plug that has an excessively long heat path - it gets too hot and goes white.

That is why it is essential that the correct heat-range plug is fitted before trying to interpret the colour.  If it is the correct plug for the engine, then it's a reasonable indication.  But as has also been said, lots of slow running, or cold running, also makes the plug run colder than normal, so it picks up a black colouration even when there is nothing wrong with the mixture.
2014 B5, stock apart from disabled auto-decomp.  Also ride a Kawasaki Versys 650 for everyday use.

Previous:
'06 ElectraX (Good bike, had no trouble at all)
'02 500ES (Fully "Hitchcocked" - 535, cams, piston, etc - and still a piece of junk)

JoeSchmofo

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Re: High Idle Speed
« Reply #23 on: Today at 09:49:35 AM »
Ok, so I live in wet cold London, what temp plug do you think I should use. I took the bike back to the dealers and they couldn't find anything wrong. They said that my pattern of use. (a daily 5 mile commute) might not be helping as the bike doesn't have enough time to get warm.

Any thoughts?

johno

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Re: High Idle Speed
« Reply #24 on: Today at 01:36:36 PM »
I'm in Uk as well, go for the NGK BPR6Es plug (not the 8 as some sites recommend) which can be found in most auto factors so is not difficult to find. if you still have fouling problems drop down to a BPR5Es normally used for short journeys as the tip of the plug retains the heat.

NGK plugs (although some hate them!) can help smooth the idle speed as well as improve on combustion from the OEM plug in an RE efi engine.
No distance is to far, No Speed is to slow.
I ride a 2012  EFI Bullet (89mpg)