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huge amount of smoke...
- Jackson
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looking for some advice. have a kz650 1979 and for a while now its been running rough but fine once warm.
if i leave it over night, when i start up its very hard to start and when it does it only runs on 2/3 cylinders.
with huge amounts of thick smoke that smells like oil. its so bad i actually had a neighbor come out and ask me to turn it off.....
when i checked the oil it was almost 2 ltrs over the top!
anyway meanwhile i quickly changed the valve seals before i noticed the oil level...
since then it still smokes , especially when you rev it...
today i pulled off my exhaust (harris 4-1) to see what cylinders were smoking and its clearly all from cylinder 3.
Ive put a bore scope in and cant see any signs of damage to the piston or the bore itself?
so the only thing i can assume is head gasket?
I don't mind doing a head gasket but don't want to keep throwing money at it if its not.
compression across all cylinders are the same.
any advice will be greatly appreciated.
thanks
J
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- Scirocco
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- Never change a running system
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Do a longer ride with a lower oil level. Clutch cover oil level control Window , oil level between the markings with the bike On center stand
My 1975 Z 1 B 900 Project
www.kzrider.com/forum/11-projects/605133...ears-deep-sleep-mode
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- SWest
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- 10 22 2014
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Steve
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Jackson
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Anyway I dropped the oil and done it again
But still smoke from cyl 3??
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- 650ed
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1977 KZ650-C1 Original Owner - Stock (with additional invisible FIAMM horn)
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- Jackson
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So took the head and barrels off today.
Again no signs of wear or damage...
Just to be safe, having the head cleaned
Skimmed and tested tomorrow morning.
All new gasket and we’ll try again.
I’ll report back but has anyone got any ideas?
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- Street Fighter LTD
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Improperly installed oil control ring
Worn oil control ring
Since you said compression is good and or equal when you tore it down also make sure all rings are indexed properly so oil and or compression doesnt sneak past rings
Dave
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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- SWest
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Steve
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- Jackson
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Done a whole lot of work -
Head and barrels off
rings
barrel gasket
Head was crack tested, light skin
Inlet seats - all valves lapped.
Head gasket
Then since obviously the valves were done the shins where all too tight. Got round that with what I had but now there a little loose but bike started up straight away...
So been riding now problem, smoke gone and had good power.
Although it would sometimes ‘pfttt’ back through the pod filters, and (not just when it ‘pfttt’)
But it would run terrible! Engine noise and spluttering all over the place. Got to work, left it and when I left work it wouldn’t start... after about 20minutes it run badly but I headed home... got 5 minutes Home and it picked back up and ran perfectly fine again and has been for the last couple days... till last night it went back to rubbish!?
So I would say timing but that’s defiantly right and the timing chains good and tensioned.
So maybe weak? But why is it changing between good and rough whenever it likes?
I’m stumped
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- Street Fighter LTD
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Bad connection ,
Bad coil.
ect/ electrric problem
Might be fuel , but electrical needs to be looked at to prove all ok
check manual
DaveB)
Original owner 78 1000 LTD
Mr Turbo Race Kit, MTC 1075 Turbo pistons by PitStop Performance , Falicon Ultra Lite Super Crank, APE everything. Les Holt @ PDM's Billet Goodies . Frame by Chuck Kurzawa @ Logghe Chassis . Deep sump 5qt oil pan. RIP Bill Hahn
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- toolmaker
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SWest wrote: Don't forget valve guide seals.
Steve
That's what my KZ900 had - bad valve guide seals - and it did the same thing.
I live near Portland, Oregon and my rider is a '76 KZ900 I bought new. I'm also in the process of restoring another one and a '73 Z1.
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