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Old 12-06-2012, 07:00 AM   #1 (permalink)
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Default Sump thing to think about

Is it worth sticking the bigger 05-06 sump (with pick-up) on an 03-04 and shimming the pump? Less windage and a few more horses or oil starvation and associated joys?
The bike's engine has a few mods, all little things add up is my reasoning for this one……...and it's cheap...if it works.

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Old 12-10-2012, 09:04 AM   #2 (permalink)
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Hmm. At least 05/06 has an cylinder head oil restrictor (in the head gasket) so it keeps more oil in the sump (and helps out with the smaller flow of the pump). 03/04 doesn't have one.

So there is a possibility of oil starvation but I don't know enough of engines to say what the chances are.
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Old 12-10-2012, 04:55 PM   #3 (permalink)
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I thought the gaskets were interchangeable, the kit ones are, I was told.
The 05-06 oil pump has a bigger impeller, but, is slower geared.
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Old 01-10-2013, 07:39 PM   #4 (permalink)
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Kawi said they reduced losses by regearing and modifying the oil pump. Less losses = less powerful oil pump = less pump displacement per rotation = less pressure.

I have to check the numbers but 05/06 has a lot lower oil pressure than 03/04 at 4000rpm. Of course after 7000rpm it's probably neglible. I have no idea what the contribution of the restrictor is but I'd guess that a 05/06 without it will have quite low oil pressure on idle.

Check the attachment for what I mean. I can't double check on the 03/04 gasket as I don't have it anymore but it's definately there with the newer gasket.
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Old 01-11-2013, 05:51 AM   #5 (permalink)
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Cheers man. Do you know if the kit gaskets are the same (the restrictor I mean)?
Or, if it would be worth drilling out the restrictor, if there is one, on a .45mm kit head gasket (05-06 RR) for my 05-06 RR headed 03 636?

Paging White Hendrix…....White Hendrix to the forum, please.

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Old 02-11-2013, 08:07 PM   #6 (permalink)
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I have absolutely no idea. I don't see any harm in running the restrictor though (except for a slightly hotter head?) as it just directs more flow to big end bearings and back to sump.
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Old 02-11-2013, 09:49 PM   #7 (permalink)
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If you can make the sump bigger without changing the pump I would. More oil means it can soak more heat and that means your cooling system doesn't work as hard and your oil will last a little longer.

It was common on the first gen 675's to shim the oil pan down 1/4" so you could run more oil when racing.
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