One white plug

  • Maxbou92
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One white plug

13 Oct 2024 08:47
#905061
Hello guys, my bike left the dyno like I post before.. he runs like hell, Very well!!! Today I have remove all plugs. And the right one (4) is tan/white.. all the others are similar(nice brown) ?!! Compression 150psi on all 4..  what are your thought about it? 
Kz750e 1980

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  • zed1015
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Re: One white plug

13 Oct 2024 09:04
#905062
Unless the plug was removed during a high speed plug chop the colour only indicates running conditions at idle.
If this is the case then the pilot/idle mix may need richening slightly which can usually be done on the mixture screw.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





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Re: One white plug

13 Oct 2024 09:10
#905063
They are all like the left one.. instead the 4 one at the right
Kz750e 1980

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Re: One white plug

13 Oct 2024 09:11
#905064
Thank youu man
Kz750e 1980

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Re: One white plug

13 Oct 2024 09:13
#905065
Your air corrector are soo good.. some bug at 3000rpm but its day and night if I compare it before now
Kz750e 1980

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Re: One white plug

13 Oct 2024 10:37 - 13 Oct 2024 10:39
#905066
Maxbou92 wrote:
They are all like the left one.. instead the 4 one at the right
Ideally you want a light turn of soot on the base ring and a tan earth electrode with a colour change near the bend.
The one on the right is near perfect.
The other three are slightly rich so lean off the pilot mix on those cylinders.
This could also be caused by high float levels in those three carbs.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
www.kzrider.com/23-for-sale/611992-air-c...lide-mikunis?start=0





Last edit: 13 Oct 2024 10:39 by zed1015.
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Re: One white plug

13 Oct 2024 12:07
#905068
I have turn them at 1 1/4 turn instead of 1 1/2 !! Float,needle and needle seat are brand new setting at 26mm +\- 1mm 
mercii
Kz750e 1980

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Re: One white plug

14 Oct 2024 06:38
#905084
The plugs are still black at 1 1/4 turn. What can cause that if all the carbs were at 1 1/2 turn out before?! Why the 4cylinder is perfect and the 3 others are black?! Engine is brand new..
Kz750e 1980
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Re: One white plug

14 Oct 2024 07:02
#905086
Have you replaced the choke plunger seals (Zed1015 does these also) looking at your dyno graph you look rich at the bottom end- and a little "lean" between 3000-4000 the rest of the way up looks great (are you on stock needles ?)
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca

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Re: One white plug

14 Oct 2024 07:16
#905087
Humm no the plungers are the same as 1979 and stock needle too .. my guy said that pilot transition to main is difficult to tune with stock needle?!! I Don’t know that point 
Kz750e 1980

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Re: One white plug

14 Oct 2024 07:17
#905088
Im from Canada, Quebec.. so how we change plungers? And what kind of needle should I get ?
Kz750e 1980

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Re: One white plug

14 Oct 2024 07:33
#905090
Maxbou92 wrote:
Humm no the plungers are the same as 1979 and stock needle too .. my guy said that pilot transition to main is difficult to tune with stock needle?!! I Don’t know that point 
The "transition" is around the point where you are "lean" - "Dynojet" needles may help this but I don't know for sure unless any other members have fitted the "Dynojet" parts and can comment ??
1982 KZ1000 Ltd
www.kzrider.com/forum/11-projects/617631...-82-begins?start=192
kzrider.com/filebase-alias?view=download...d-fault-diagnosis&ca

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