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crankcase oil blow-by
- 1015bill
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The pistons, rings and bore has 35k, bottom end has 60k miles. Oil level is correct. There is no exhaust smoke, or other problems. Runs fine, plugs are clean.
1975 900 Z1B, ZX6 REAR SWINGARM & FRONT END, 1015 KIT, ANDREWS CAMS,DYNA IGNITION, MIKUNI 36 RADIAL FLATSLIDES, K&N AIR FILTERS, KERKER EXHAUST & OIL COOLER, LED INTERGRATED TAILLIGHT & BLINKERS, GSR REARSETS, CORBIN GUNFIGHTER SEAT,ETC.
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- gane
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[img][/img] 1977 KZ1000A1
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- Old Man Rock
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1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- kzz1p
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- One Test Is Worth A Thousand Expert Opinions!
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I my personal opinion! 35,000 miles on some top ends, are alot. And 60,000 miles on the bottom end, thats alot. If you are the second, third or tenth owner, who knows? Thats why they can't talk.
If you love the bike and plan on keeping it? Let it rest in peace and give it a complete rebuild.
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- keith1
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Bill, This is just an offering, and hopefully completly wrong.. but, if you have an escaped wristpin circlip/worn/gone teflon button, I've seen instance (1) where wrist pin has worn cyl. causing blow-by once piston was mid-way down stroke. This would explain good comp. clean plugs, yet blow-by. Exhaust all other alternatives 1st, hope I wrong G
if he had an escaped circlip, he d know it!!....if he used buttons, they are not known for longevity...could very well be the problem.......35k.. might just be time for a top end freshening up ..good luck ....
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- 1015bill
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1975 900 Z1B, ZX6 REAR SWINGARM & FRONT END, 1015 KIT, ANDREWS CAMS,DYNA IGNITION, MIKUNI 36 RADIAL FLATSLIDES, K&N AIR FILTERS, KERKER EXHAUST & OIL COOLER, LED INTERGRATED TAILLIGHT & BLINKERS, GSR REARSETS, CORBIN GUNFIGHTER SEAT,ETC.
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- Old Man Rock
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@ 3k you should measure 2.8 lbs, not 10 lbs...???
I recently just replaced my oil pump where I measured exactly 2.8 lbs at 3k rpm... In reviving up to 4K I then went to 10 lbs...
I would think at 3k if you're already at 10 lbs then you must be developing some serious case pressures at higher rpm's henceforth blow by...
Or am I missing something here...
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- PLUMMEN
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Still recovering,some days are better than others.
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- bountyhunter
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1979 KZ-750 Twin
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- 1015bill
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Thanks for your input.
1975 900 Z1B, ZX6 REAR SWINGARM & FRONT END, 1015 KIT, ANDREWS CAMS,DYNA IGNITION, MIKUNI 36 RADIAL FLATSLIDES, K&N AIR FILTERS, KERKER EXHAUST & OIL COOLER, LED INTERGRATED TAILLIGHT & BLINKERS, GSR REARSETS, CORBIN GUNFIGHTER SEAT,ETC.
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- Old Man Rock
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One thing I can think of is a blocked cylinder passage up to the head/valves/camshafts... Meaning your oil is trapped down in the lower case, no flow...
Since you mentioned new oil leaks....
What about your oil filter itself, when was the last time you replaced... Just something to think about, no need to answer.... Possibly old gaskets and new pressures due to as Plummen menitoned, shiming the oil pump for increased flow....
OMR
1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter
Phoenix, Az
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- 1015bill
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1975 900 Z1B, ZX6 REAR SWINGARM & FRONT END, 1015 KIT, ANDREWS CAMS,DYNA IGNITION, MIKUNI 36 RADIAL FLATSLIDES, K&N AIR FILTERS, KERKER EXHAUST & OIL COOLER, LED INTERGRATED TAILLIGHT & BLINKERS, GSR REARSETS, CORBIN GUNFIGHTER SEAT,ETC.
Please Log in or Create an account to join the conversation.