Spark plug colour?

bergbro · Dec 14, 2011

I am curious to know what colour other peoples spark plugs are after a plug chop.
Stock jetting was 160 mainjet.
Did a chop with a 165 mainjet and the plug was whitely white.
Next with a 170 mainjet its gone a light grey colour.
Just popped a 175 in and will do a chop on my way home in the morning. Hopefully be light tan (or reddy grey).

Running best its ever run with 37.5 pilot (ps=3.75ish need a 40 pilot maybe), Taffy's needle and a 170 main. stock air jets.

Exelent control off the bottem to a fat as midrange and what seems to be a fading top end as I increase the mainjet size (indicating an over rich state, but the plug does not indicate richness!), but I am only using the arsometer not a dynometer.
Hence my question..... what colour does your plug run under full load mainjet use?

Idle · Dec 14, 2011

I'm going to read your post now,but first I just wanted to say...Post a pic would ya?

bergbro · Dec 14, 2011

Idle said:
I'm going to read your post now,but first I just wanted to say...Post a pic would ya?

Sory idle, quiet nite at work. Thort the thousand word option better than the 2 second pic.

Truth is, I prefer books with more pictures than words so I take your point.

Reality is, I am not sure 3 photos taken on different occasions would give a true rendering of the suble colour differences between the jets. Maybe three plugs lined up in one photo?

Bollox. Too wet to risk a high speed run for a plug chop on the way home this morn but it feels so much better with the 175 main. Will prove its right in the morn on the way home.
Waiting for a 40 pilot and job will be a good un.

Obviously not many folks set their mainjet size by plug colour anymore!

So how do you fella's and fellettes do it?

Darryl

bushmechanic · Dec 15, 2011

been that long I forgot the colours I got but set stupid rich it was one colour and stupid lean it was another so inbetween was inbetween

FWIW I found everything so much easier to blend in over the rev range with a smaller main air jet :wink:

bergbro · Dec 15, 2011

FWIW I found everything so much easier to blend in over the rev range with a smaller main air jet :wink:[/quote]

Bewdy. cheers buddy.

F+ · Dec 15, 2011

Yous guy'es think I should try the 175 I have ?

I have a nice redish grey on the old plug.

And I know this has been covered not to long ago but,

The gold specks in the oil and screan ?

The inside of the engine looks great.

the piston and valves are a little caked though

Number9 · Dec 15, 2011

I always like this page plug colors
http://www.dansmc.com/Spark_Plugs/Spark ... talog.html

bushmechanic · Dec 15, 2011

F+ said:
Yous guy'es think I should try the 175 I have ?

I have a nice redish grey on the old plug.

And I know this has been covered not to long ago but,

The gold specks in the oil and screan ?

The inside of the engine looks great.

the piston and valves are a little caked though

gold flakes in mine came from the small sintered bushing inside the gearbox input shaft, you can get to it by removing the clutch slave, pull the pushrod out and check if the ends are faced off square, if not square it puts side loads on the bushing.

bergbro · Dec 15, 2011

F+ said:
Yous guy'es think I should try the 175 I have ?

I have a nice redish grey on the old plug.

And I know this has been covered not to long ago but,

The gold specks in the oil and screan ?

The inside of the engine looks great.

the piston and valves are a little caked though

Depends wot size jet you have now bro.
I am looking for redish grey colour myself, had to go from 160 upto 175 main jet to get the colour right.

As for the gold specks......... wot here said!

F+ · Dec 18, 2011

Will do Bushmech.,

And it's got a 182 was on third from the bottun.

I cut the farings out to fit the gas tank gaps under the seat for more air and dropped the clip one, those valves are look to caked to me. I'll take some pics later today and post them.

zaga · Dec 18, 2011

Hi

Here's another image of color plugs:

[attachment=0:2qjn809j]plug_colors.jpg[/attachment:2qjn809j]

:cheers:
ZAGA

F+ · Dec 18, 2011

The pushrod is not squared,

repete

The pushrod is not squared

F+ · Dec 18, 2011

picture time

Your help is greatly appreciated

bushmechanic · Dec 18, 2011

F+ said:
The pushrod is not squared,

repete

The pushrod is not squared

I mean the end in contact with the slave pushrod, the face that contacts the slave pushrod should be perpendicular to its axis like you've put it in a lathe and faced it off.

I ground a concave dish in mine

to check get a 90 degree builder square and hold it up to the light

F+ · Dec 18, 2011

not square,

Spark plug colour?

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