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Author Topic: Cb750 fresh build dark oil  (Read 366 times)

Offline quadracer351

  • Posts: 540
Cb750 fresh build dark oil
« on: Oct 28, 2017, 04:12:00 »
The only thing I've done since the rebuild is turn the bike over and let it idle the bike has yet to be ridden and this is what the oil is looking like. It's bored out to 811, It doesn't smell like fuel has and doesn't seem metallic at all. Is this normal and I'm over thinking running penzoil 10w 40 for now it?

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« Last Edit: Oct 28, 2017, 04:14:11 by quadracer351 »

Offline cxman

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Re: Cb750 fresh build dark oil
« Reply #1 on: Oct 28, 2017, 08:29:51 »
fresh build with new walls and a new rings has a lot of carbon will  slip by the rings in the crevices of the hatch pattern and low spots

that could be what has stained the oil

how long have you run it

1978 CX650 Super Deluxe
1979 XS1100 Special
1974 xl350
1983 cx650 Custom
1973 cb750
1980 cb750
1981 cb650
1982 cb900 c
1974 kawasaki 350 bighorn
1983 GL1100 aspy full dress
1983 GL1100 Nekid
and a bunch of others

Offline quadracer351

  • Posts: 540
Re: Cb750 fresh build dark oil
« Reply #2 on: Oct 28, 2017, 15:30:51 »
fresh build with new walls and a new rings has a lot of carbon will  slip by the rings in the crevices of the hatch pattern and low spots

that could be what has stained the oil

how long have you run it
On and off less than an hour total just to check that things are working properly

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Offline teazer

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Re: Cb750 fresh build dark oil
« Reply #3 on: Oct 28, 2017, 17:20:28 »
Mine comes out darker than that after a single 1/4 mile run.   Run it some more and see how it looks after a few hundred miles.  Typically oil comes out almost black after a few thousand miles.  Some of that is carbon, some is clutch plates and some is from parts slowly wearing and mating.

Offline quadracer351

  • Posts: 540
Re: Cb750 fresh build dark oil
« Reply #4 on: Oct 29, 2017, 00:38:18 »
Mine comes out darker than that after a single 1/4 mile run.   Run it some more and see how it looks after a few hundred miles.  Typically oil comes out almost black after a few thousand miles.  Some of that is carbon, some is clutch plates and some is from parts slowly wearing and mating.
Sounds good, thank you

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