White spark plugs - Wrist Twisters
 
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post #1 of 16 Old 06-08-2014, 11:51 AM Thread Starter
Milites Gregarius
 
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White spark plugs

Hello guys, today i inspected my spark plugs and i saw that electrod spark plugs have white color. This means that my mixture is poor?
I have 900RR headers and Tyga perfomance exhaust with oem air filter.
I am very concerned and i need help.

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post #2 of 16 Old 06-08-2014, 01:48 PM
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High heat or running lean, pictures of the plug?

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post #3 of 16 Old 06-08-2014, 04:24 PM
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yeah pics of the plug would be best.

if they truly are white you are running lean which is not good.

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post #4 of 16 Old 06-08-2014, 07:15 PM
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Hard to believe a 919 would run lean!

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post #5 of 16 Old 06-09-2014, 12:01 PM Thread Starter
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post #6 of 16 Old 06-09-2014, 12:16 PM
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Is that too lean? It looks to be what I thought was normal wear.

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post #7 of 16 Old 06-09-2014, 12:19 PM
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I think it should be a tiny bit more tan than that, but what your looking at isnt terrible or motor - threatening

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post #8 of 16 Old 06-09-2014, 12:50 PM
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Looks fine. Fuel injected motorcycles do not yield the same plug characteristics as conventional carbs do. For example you simply cannot do a plug chop in a fuel injected 4 stroke engine and expect to get accurate results like in the old days. Inspecting the plugs of a modern Fi motorcycle engine will only alert you to a problem of extreme nature.

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post #9 of 16 Old 06-09-2014, 04:39 PM
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I remember doing plug chops on carbureted race cars. Those were the days.

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post #10 of 16 Old 06-11-2014, 11:32 AM Thread Starter
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Thanks guys, now I can sleep peacefully))))))

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post #11 of 16 Old 06-28-2014, 12:55 AM Thread Starter
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Hello again, I did a post about spark plugs, thinking that the problem is in them.
The problem is this, after warm up, the bike starts to move badly, appeared in the muffler claps, when closing the throttle in high speed sound like pur-pur-pur. But on a cold engine is no such problem. The FPR replaced 6000 km ago.
Also installed PAIR plates.

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post #12 of 16 Old 07-01-2014, 01:50 PM Thread Starter
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Make a short video, please check the sound at low speed, seems fpr is dead. Am I right?
Low rpm bad perfomance - YouTube

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post #13 of 16 Old 07-01-2014, 02:26 PM
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Sorry man, audio is WAY too low to hear anything...

You'll know if you have a bad FPR if the 2/3 header pipes are colder than 1/4.

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post #14 of 16 Old 07-02-2014, 12:17 AM Thread Starter
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Hello guys.
It is written in the description of the synchronization procedure in this forum
-remove vacuum hoses from throttle bodys 1 and 4
-remove the vacuum lines closest to center line of bike on 2 and 3 (the outer vacuum lines on 2 and 3 are tied to the fuel pressure regulator and should not be removed)




In the service manual on the picture shows that the FPR hoses route another


And I found on ebay two pics, 1st is 02' 919 and 2nd is 07


Which is right?

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post #15 of 16 Old 07-02-2014, 02:05 AM Thread Starter
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Quote:
Originally Posted by g00gl3it View Post
Sorry man, audio is WAY too low to hear anything...

You'll know if you have a bad FPR if the 2/3 header pipes are colder than 1/4.
Thanks, I will try to make another video.

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post #16 of 16 Old 07-02-2014, 08:31 AM Thread Starter
Milites Gregarius
 
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Today I checked the heating pipes, 2 and 3 as hot as 1, but is colder.
And I began to search problem.
Started the engine and disconnected a plug cap on 4th cyl. nothing happened.
I swapped plug wires with cap 1 and 4 cylinder - no changes
I swapped ignition coils 2/3 and 1/4 - no changes
I replaced spark plug - no changes
I think that the problem in fuel injector 4 cyl.
What do you think?


Low rpm bad perfomance #2 - YouTube

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