Colourtune and spark plug condition

  • gordone
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26 May 2019 09:25 #804595 by gordone
Colourtune and spark plug condition was created by gordone
Yesterday I used the color tune to adjust the idle mix screw.
I adjusted idle approx. 2000 rpm and then I adjused the screw to full blue colour and turned slow back in until I could see some (tried to find the point where I saw yellow for the first time) yellow colour...

I took picture of the spark plugs before I tunned:

Cylinder 1:


Cylinder 2:


Cylinder 3:


Cylinder 4:

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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  • gordone
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26 May 2019 09:31 #804598 by gordone
Replied by gordone on topic Colourtune and spark plug condition
After the tunning was I installing new spark plugs and drive a tour for 62 miles and in the end of the trip it was some traffic jam.. so I was on idle for a while... rest of the trip (before end of the trip) was in 60-90km/h range.

Before taken after the trip:

Cylinder 1:


Cylinder 2:


Cylinder 3:


Cylinder 4:

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
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  • gordone
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26 May 2019 09:32 #804600 by gordone
Replied by gordone on topic Colourtune and spark plug condition
What do you think?
Is the jets and pilot screw good now?

The bike is good to drive in whole range driving !

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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  • SWest
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26 May 2019 09:38 #804601 by SWest
Replied by SWest on topic Colourtune and spark plug condition
I think it was better before. Haven't had much luck with the color Tune.
Steve
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  • gordone
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26 May 2019 09:45 #804604 by gordone
Replied by gordone on topic Colourtune and spark plug condition
I was driving in high speed before i took out the plug before the tuning...

Start to get tired of these.... :)

How bad is it?

Try to screw all four in 1/4 turn and install new sparks?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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26 May 2019 10:34 - 26 May 2019 10:35 #804613 by Warren3200gt
Replied by Warren3200gt on topic Colourtune and spark plug condition
Screwing in will make them worse. In for less air, out for more. What the mixture screw does is block the air passage. I would turn them out 1/4 then check again.
Colourtunes are good if you have some experience with them. From your description it sounds right but you had just a tad too miuch orange.


Z1000J2 somewhat modified!

Last edit: 26 May 2019 10:35 by Warren3200gt.

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  • gordone
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26 May 2019 11:02 #804623 by gordone
Replied by gordone on topic Colourtune and spark plug condition
Will try go out 1/4, how fare must I drive, all range of speed and throotle?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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26 May 2019 11:46 - 26 May 2019 12:03 #804628 by Warren3200gt
Replied by Warren3200gt on topic Colourtune and spark plug condition
Colourtune can only set the pilot circuit which to be fair is about 60 or 70% of most peoples riding. Your can not check high revs with a colourtune as they are not strong enough and the last thing you want to do is have one break whilst your looking into it. The clear partion is glass and will shatter.
So to answer your question go fo a ride without going over 3 or 4k rpm then check your plugs. If good then go for another ride trying to keep the revs above that then check your plugs again. This second check will tell how your main jet and needle jet are performing.


Z1000J2 somewhat modified!

Last edit: 26 May 2019 12:03 by Warren3200gt.
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  • gordone
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27 May 2019 15:29 #804681 by gordone
Replied by gordone on topic Colourtune and spark plug condition
Will drive to work tomorrow 10km each way, 20km total.

Will not go over 3-4 rpm.

What about the posistion on the throotle?
Is it just rpm who is important?

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine

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  • Scirocco
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27 May 2019 15:41 #804682 by Scirocco
Replied by Scirocco on topic Colourtune and spark plug condition
What is your current carb Setup, (air box or pot filter, jets size, needle Position)???

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  • gordone
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27 May 2019 15:42 - 28 May 2019 13:02 #804683 by gordone
Replied by gordone on topic Colourtune and spark plug condition
I`m running pods, the bike is going really well, some "uncerten" 2-3 range if I not have the perfect gear compare to the speed and hill, but that properly normal.. as car... change gear to hill and speed...

Pilot: 17.5
Main: 112.5
Needle: 4 position, one step from the heights point on the needle.

Bike runs really well in all conditions! I`m happy :)

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Last edit: 28 May 2019 13:02 by gordone.

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28 May 2019 12:51 - 28 May 2019 12:59 #804725 by gordone
Replied by gordone on topic Colourtune and spark plug condition
Today have I driven back and forth to job (10km * 2) 80% is on the highway so I have been close to the 3 rpm rest have I tried to be closer to 2 rpm.

I took out the spark plug when I come home, please see photo below:

Cylinder1:


Cylinder2:


Cylinder3:


Cylinder4:



I have cleaned the plug and installed them again:



I have adjusted all carb accept the one on cylinder 4, think that is good enough?

Cylinder 1 = 1/4+ out
Cylinder 2 = 1/8+ out
Cylinder 3 = 1/4+ out
Cylinder 4 = nothing

1981 KZ650-D4, with 1981 z750L engine (Wiensco 810 big bore).

Project:
www.kzrider.com/forum/11-projects/607213...sr-1981-z750l-engine
Last edit: 28 May 2019 12:59 by gordone.

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