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Ishampadron
Posted on Tuesday, September 04, 2018 - 11:39 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I have a dry motor and I want to gently prime the oil system by hand by going into 5th gear and manually turning the rear wheel. Does anyone know how many full revolutions of the wheel it would take to get enough oil flowing into the system? Also what would be a good way to test that we are primed? Perhaps, taking the rocker cover off and seeing the oil come up.
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Teeps
Posted on Tuesday, September 04, 2018 - 11:59 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Why is the engine "dry"?
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Ishampadron
Posted on Tuesday, September 04, 2018 - 02:58 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Oil was drained and motor has been sitting for months since I bought it.
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Teeps
Posted on Tuesday, September 04, 2018 - 03:20 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If mine, I would put oil in the bag.
Start the engine then let it idle until the oil light turns off before reving it over idle speed.
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Audiowize
Posted on Tuesday, September 04, 2018 - 04:04 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Take the spark plugs out, then use the starter motor to spin up the engine. Since you have a dry motor, just unplug the fuel pump so there's never any fuel pressure to squirt gas into the engine. I can't remember for the XB, but for some engines the oil pressure light can be extinguished with the starter motor spinning up an engine with 0 compression.
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Ducbsa
Posted on Tuesday, September 04, 2018 - 04:51 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Does firing ungrounded plugs hurt the coils or anything else?
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Livers
Posted on Tuesday, September 04, 2018 - 05:09 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I'm with Teeps.
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Griffmeister
Posted on Tuesday, September 04, 2018 - 08:02 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You can ground the plugs so thereís no change in electrical load. The engine may not be as dry as you think. When I had to fix my transmission, my engine really was dry. Good thing I pre-lubed everything on reassembly, it took a god awful time to turn the light off. Be prepared for a lot of cranking.
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Ishampadron
Posted on Tuesday, September 04, 2018 - 10:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Thanks guys but y'all didn't answer my question. Lol. The motor is not even in the frame yet. I wanted to prime it to make sure things are moving nicely before i put the engine in because it's a used motor i really don't trust it 100%.
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Shoggin
Posted on Wednesday, September 05, 2018 - 12:09 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

You have to spin the oil pump to build pressure and get flow through the engine. Your choice how you do that.

Putting in a used engine? Just put it in, fill with oil, start.

Don't be crazy cold engine revving guy.
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Griffmeister
Posted on Wednesday, September 05, 2018 - 07:10 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Maybe drill a hole in a spare filter and weld or braze a pipe nipple to it. Then plumb up some kind of hand pump that you can use to fill the system. Have to double check a lube diagram to see if thatís a good spot.
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Teeps
Posted on Wednesday, September 05, 2018 - 11:55 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Ishampadron Posted on Tuesday, September 04, 2018
Thanks guys but y'all didn't answer my question.
Lol. The motor is not even in the frame yet.

Might should have led with the engine is not in the frame.
I doubt anyone here has ever "primed" a dry engine, as you describe; hence no direct answer to your question.
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1_mike
Posted on Wednesday, September 05, 2018 - 12:24 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

To answer the original question...
NO, won't work. It's not the by "slow", hand spun "revolutions" of the crankshaft/oil pump, it's the "speed".
Turning the crankshaft/oil pump by turning the rear wheel (in any gear) is not going to do anything at all.

Most bike engines aren't like a car engine, where it normally easy to prime the oil system. You can't get to the oil pump to spin it.

As long as the engine was either running or "properly" assembled, it will have enough oil to protect the rubbing parts until the pump can push the oil thru the system.
Probably take about 2 to 4 seconds after the engine starts for the oil light goes out.

Mike
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Akbuell
Posted on Wednesday, September 05, 2018 - 04:37 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

If the engine is sitting on the floor:

Strap it down so it is stable
Hook up a battery to the starter and the engine case
Hook up an 'IV' bag to the oil inlet and return
Remove the plugs
Using a jumper wire as a start switch, spin the motor over for a few seconds at a time, to avoid overheating the starter
Look for oil coming out of the return line

A multimeter to the oil pressure switch will (should) let you know oil is flowing before it fills the return line

Hope this helps, Dave
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