SPARK PLUG Electrode Colours?

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DKWW2000
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SPARK PLUG Electrode Colours?

Post by DKWW2000 » Mon Apr 24, 2017 9:58 pm

Removed my 2 NGK Leading plugs to check & clean & found that the rear plug was a lot lighter coloured than the front which I think shows the rear is running a lot hotter than the front, any suggestions?

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Image
Both the trailing are the same normal golden colour.
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander

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Re: SPARK PLUG Electrode Colours?

Post by spirit r » Tue Apr 25, 2017 9:29 am

Check your Nikki, Pete.

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Re: SPARK PLUG Electrode Colours?

Post by TOOL » Tue Apr 25, 2017 6:30 pm

Rear chamber is lean.
Listening to the cowbells

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Re: SPARK PLUG Electrode Colours?

Post by DKWW2000 » Tue Apr 25, 2017 7:46 pm

TOOL wrote:Rear chamber is lean.
That is what I thought, what is the best way of rectifying this? The mixture screw adjusts both rotors so is there another adjustment for each individually or is it a carb rebuild?
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander

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Re: SPARK PLUG Electrode Colours?

Post by spirit r » Wed Apr 26, 2017 9:07 am

Clean the sparks. Make a Test drive on the primaries only.(3000U/min)Control the rear trailing spark.
Clean the sparks. Make a Test drive on the secondaries (full throttle :D) Control the spark.

The spark is lean on both test. Rebuilt the carb. Otherwise cleaning the Primary or secondary fuel Jet of the rear chamber inside the nikki.

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Re: SPARK PLUG Electrode Colours?

Post by TOOL » Wed Apr 26, 2017 10:00 am

As above. Pull the jets out and hopefully one's a bit blocked on the rear rotor side.
Listening to the cowbells

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Re: SPARK PLUG Electrode Colours?

Post by DKWW2000 » Wed Apr 26, 2017 11:45 am

Thanks guys, I have a spare Carb & a Re-Build kit so I think I will do a straight swap once done.
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander

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Re: SPARK PLUG Electrode Colours?

Post by spirit r » Wed Apr 26, 2017 1:49 pm

DKWW2000 wrote:Thanks guys, I have a spare Carb & a Re-Build kit so I think I will do a straight swap once done.
Pete do not change the two needle, seats and float. Only clean them and put a little two Stroke oil inside. I made my own caburator Kit and take dirko paper as you can read in my post. Remove the two little fuel filter before the needle they are crap. I am mounting an extern fuel filter before the carb fuel horn for a better flow.

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Re: SPARK PLUG Electrode Colours?

Post by DKWW2000 » Wed Apr 26, 2017 7:51 pm

spirit r wrote:
DKWW2000 wrote:Thanks guys, I have a spare Carb & a Re-Build kit so I think I will do a straight swap once done.
Pete do not change the two needle, seats and float. Only clean them and put a little two Stroke oil inside. I made my own caburator Kit and take dirko paper as you can read in my post. Remove the two little fuel filter before the needle they are crap. I am mounting an extern fuel filter before the carb fuel horn for a better flow.
Vielen Dank Thomas, Ich werde mich erinern
RX7 FB S3 - RX7 FC TII Vert
Rotaries Previously Owned:-
2 x NSU Ro 80s - 2 x S2 RX7s - Suzuki RE 5 - DKW(Hercules) W2000 - Norton (Krauser) Commander

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