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Sticky fluid 10 Mar 2024 07:29 #896248

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Hi 
I have been using my KZ for the past month without any problems but recently the throttle is not returning properly and tick over is very erratic, on taking them apart I found the bores are contaminated with a thick substance almost like tar, I have only ever used E5 petrol (in the U.K.) so was wondering if anyone else has come across this before?.
It is a 1978 KZ650 B2 import from the USA.
thanks 
1978 Z650 B2, US import to the UK
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Sticky fluid 10 Mar 2024 07:52 #896249

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Well it is the colour that ethanol fuel goes when as it evaporates but to leave that amount of shite it would need to have been E55 not E5.
It can only be fuel related, either the fuel itself or maybe shite from the tank. Are you using an ethanol treatment? 
​​​​​​Is the tank lined? Maybe breaking down.?
Was it sprayed internally with fogging oil or some other substance whilst laid up? 
Just ideas as never come across anything that bad. 

Z1000J2 somewhat modified!

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Sticky fluid 10 Mar 2024 09:36 #896251

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To me they look more like they have been sitting for some time with fuel in them.  Not like there were running.
1977 KZ650 B1
Pods and Denco header

This is my Z

OLD KAW OWNERS SMILE ALOT
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Sticky fluid 10 Mar 2024 09:47 #896252

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That goo is what remains when all the good stuff has evaporated out of ethanol fuel.
There's a chance that the petrol stations E5 pumps actually contain E10 and they are pocketing the difference.
AIR CORRECTOR JETS FOR VM CARBS AND ETHANOL RESISTANT VITON CHOKE PLUNGER SEAL REPLACMENT FOR ALL CLASSIC AND MODERN MOTORCYCLE CARBURETTORS
kzrider.com/forum/23-for-sale/611992-air-corrector-jets-





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Sticky fluid 10 Mar 2024 10:03 #896254

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Looks like a very poor cleaning job. It's a wonder it ran at all. 

Steve
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Sticky fluid 10 Mar 2024 16:00 #896261

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Looks like a very poor cleaning job. It's a wonder it ran at all. 

Steve
No kidding.  Those are some seriously dirty carbs.  They need a full teardown, and soaking in carb dip.  Spraying them down while ganged together is a fool's errand.  Plus, all new O-rings...and get rid of the multiple bowl gaskets.  

BTW, regular, non ethanol gasoline, gets grungy just the same.  
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Sticky fluid 11 Mar 2024 00:56 #896271

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The tank isn’t lined it is in very good condition, I haven’t tried ethanol treatment but I will do, I was thinking the petrol is contaminated with something, what would be the best thing to use to wash out the tank to remove any residue ?
tia.
1978 Z650 B2, US import to the UK

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Sticky fluid 11 Mar 2024 00:58 #896272

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Thanks, I have completely stripped them down now for a thorough cleaning, it was running but only just .
1978 Z650 B2, US import to the UK

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Sticky fluid 11 Mar 2024 01:01 #896273

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Thanks, I did wonder if it is E10, they are all stripped for cleaning , I will try an ethanol additive aswel , i need to find something suitable 
1978 Z650 B2, US import to the UK

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Sticky fluid 11 Mar 2024 01:30 #896274

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The marine version stays active for twice the time period. I have bikes that don't get used some years but they fire right up without issue when I do use them. 


Z1000J2 somewhat modified!

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Sticky fluid 11 Mar 2024 06:40 #896281

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The cross-point screws holding the carbs to the joining plate are completely butchered.  How did you get them out?  

And for what it's worth, a Vessel #3 Impacta is my go-to tool to remove those screws.  

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Sticky fluid 11 Mar 2024 06:45 #896282

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The cross-point screws holding the carbs to the joining plate are completely butchered.  How did you get them out?  

And for what it's worth, a Vessel #3 Impacta is my go-to tool to remove those screws.  
I think looking at the length of the float bowl screws there is a PO or two that have been "less than sympathetic" 
 

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