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Engine Knock On Start Up? Whats Cuasing this..
- Bullitt03737
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Ive got some info that may help solve this. It was low on oil. But I topped it off quickly after realizing this. Spark plugs are perfect. When I opened up the oil fill plug a little smoke? maybe came out. The oil looks dirty and thin. I searched and saw that thin oil may cuase it. Would my best bet at this point be to change the oil and see what happens? And the motor seems hot. What should the temprture of the heads be? Also oil leaks out from the valve cover where it meets the head. It it just a bad gasket, or is there pressure building up inside forcing it out? I removed the smog system, could this be cuasing a build up of pressure?
Thank you..
Ian
1980 CSR 1000. New dyna Coils, Vacumn Less Petcock, Various Handle bars depending on the day, (Drag and Clubman.)
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- anarki650
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09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- Bullitt03737
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1980 CSR 1000. New dyna Coils, Vacumn Less Petcock, Various Handle bars depending on the day, (Drag and Clubman.)
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- anarki650
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I run Belray semi-synthetic in all my bikes. It's a little pricey but good oil is worth the cost. If you dont' want to use Belray use a motorcycle specific oil (car oils have cleansers in them that aren't necessarily good for wet clutch systems).
09 Kawasaki ER6n
77 kz650b1 cafe rebirth project
"Being shot out of a cannon will always be better than being squeezed out of a tube, that's why God made fast motorcycles..."
Dr. Hunter S. Thompson
Omaha NE
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- Bullitt03737
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1980 CSR 1000. New dyna Coils, Vacumn Less Petcock, Various Handle bars depending on the day, (Drag and Clubman.)
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- bountyhunter
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Definitely.Would my best bet at this point be to change the oil and see what happens?
Bullitt03737 wrote:
I hope you didn't remove the crankcase vent system. They have to be vented or they will have pressure from the piston stroke. All crankcases are vented in some way or another.Also oil leaks out from the valve cover where it meets the head. It it just a bad gasket, or is there pressure building up inside forcing it out? I removed the smog system, could this be cuasing a build up of pressure?
Thank you..
Ian
1979 KZ-750 Twin
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- bountyhunter
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Castrol GTX 10-40 is pretty good and available almost everywhere for reasonable price.Ill have to see if I can find a good bike oil.
Bullitt03737 wrote:
Definitely.What about the filter. Should that be changed as well?
Bullitt03737 wrote:
If you still hear a knock on startup that goes away after five seconds.... the fix might be ear plugs. Seriously, old engines get lower oil pressure from wear and they sometimes make noise at startup until the pump gets filled and gets full pressure up and oil to all parts of the engine. As long as it goes away quickly and there are no symptoms during normal operation: I'd ride it.If this dosent slove the problem what should my next step be?
1979 KZ-750 Twin
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- 76 LTD
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- Bullitt03737
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1980 CSR 1000. New dyna Coils, Vacumn Less Petcock, Various Handle bars depending on the day, (Drag and Clubman.)
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- Patton
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... When I opened up the oil fill plug a little smoke? maybe came out. The oil looks dirty and thin....
Would also sniff-test crankcase oil for any gasoline odor.
1973 Z1
KZ900 LTD
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- violentvintagecycles
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- Bullitt03737
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1980 CSR 1000. New dyna Coils, Vacumn Less Petcock, Various Handle bars depending on the day, (Drag and Clubman.)
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