Author Topic: xbr500 Lubricating pistons on assembly  (Read 107 times)

richardeblack

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xbr500 Lubricating pistons on assembly
« on: November 02, 2020, 02:01:19 PM »
Hello All,
Me again.
Starting to assemble my XBR engine and having checked every thing for ring gaps etc, I looked in the manual and it says to apply molybdenum disulphide grease  to the piston od before fitting.  Never heard of this before, just used oil on floating gudgeon pins. 
Does anyone else do this? 
Thanks,
Richard.

tommy

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Re: xbr500 Lubricating pistons on assembly
« Reply #1 on: November 02, 2020, 09:45:27 PM »
that's what i always use engine oil from the oil can  Richard 

johnr

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Re: xbr500 Lubricating pistons on assembly
« Reply #2 on: November 07, 2020, 03:12:26 PM »
fresh engine oil for me too.

richardeblack

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Re: xbr500 Lubricating pistons on assembly
« Reply #3 on: November 08, 2020, 08:27:40 AM »
Thank you both for that. It did seem odd but clearly says to use grease in the Honda manual. I'll stick with my intuition and your advice and use oil.
Thank you
Richard

CrazyFrog

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Re: xbr500 Lubricating pistons on assembly
« Reply #4 on: November 08, 2020, 08:44:43 AM »
Yep, I use engine oil too. Unless it's a two stroke - then I use 2T oil!  ;D
2011 Jawa 350 Sport
2016 Jawa 350 Classic

iansoady

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Re: xbr500 Lubricating pistons on assembly
« Reply #5 on: November 08, 2020, 10:19:16 AM »
There is a school of thought that says you should assemble pistons dry to help running in. Never tried it myself but I do always use ordinary engine oil not synthetic as I could see that might be too slippery.
Ian.
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themoudie

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Re: xbr500 Lubricating pistons on assembly
« Reply #6 on: November 08, 2020, 11:26:14 PM »
Plenty of ordinary mineral oil of the same viscosity, either straight or multigrade, as you are going to use for the initial running in.

PLUS, I use Oregon Red Fluid Grease on the bearing surfaces in the cylinder head and throughout the motor. Camshaft running directly in the aluminium casting! It stays in place if you have delays during the rebuild before the initial startup and I haven't had any problems during the initial 20 - 25 mile run, before dumping the oil and re-filling with another fill of mineral oil. After the first 500 miles you can put a semi-synthetic oil in, but I don't believe that fully-synthetic oil is necessary with these engines.

Also add Chainsaw 2stroke oil to the fuel at 50:1 ratio for the first tank full of fuel. It doesn't appear to effect the rings/valves bedding in and gives me peace of mind that the engine top end has lubrication.

Good health, Bill