660 Cylinder/Piston Oiling System

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660 Cylinder/Piston Oiling System

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660 Cylinder/Piston Oiling System - 9/4/2008 6:56:26 PM

mud_dog450

Posts: 5527
Joined: 6/20/2004
From: Northeastern Indiana
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So it's been well over a year since I've had any Yamaha engine apart. I'm too familiar with KTM engines, and that get's me nowhere as I'm sitting here trying to figure out the internal oiling systems for the Grizzly engine by looking at oil-flow charts.

So this is where you guys who've had your cases apart a few times get to answer a few questions for me.

1. The cylinder and the bottom of the piston are lubricated and cooled by oil slung from the crankshaft correct?

2. The oil that the crankshaft slings is from both the lower conrod bearing and also from crankshaft dipping into the oil sump in the bottom of the crankcase correct?

3. Because of this, there is no oil jet that squirts oil into the bottom of the piston correct?

4. Finally, the wrist pin (piston pin) is lubricated from the oil from the cylinder walls which is scraped from the cylinder by the scraper ring, then directed onto the wrist pin surface via the oil holes located in the scraper ring groove, correct?

I've been thinking about this lately because I've been brainstorming/writing down all ideas I've been having about how I would like to build up my Grizzly once the rings are worn out and won't hold good compression anymore. I've been thinking of adding in an oil jet that squirts pressurized oil onto the bottom side of the piston to aid in cooling the piston and keeping the cylinder good and lubricated.

Anywho, I'm thinking of building my Grizzly to either an 800 EFI using the Hauck kit or a 727 EFI and a Microsquirt ignition and fuel management system to power it all. If I'm going to do all of that, I'm going to ensure it has everything it needs to stay together after spraying it or possibly forcing air through it.

< Message edited by mud_dog450 -- 9/4/2008 7:41:09 PM >

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Post #: 1

RE: 660 Cylinder/Piston Oiling System - 9/5/2008 1:17:27 AM

rocketron

Posts: 267
Joined: 4/5/2005
From: BC, Canada
Status: offline

Yes the piston/rod is splash lubricated.

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Post #: 2

RE: 660 Cylinder/Piston Oiling System - 9/5/2008 11:17:26 AM

mud_dog450

Posts: 5527
Joined: 6/20/2004
From: Northeastern Indiana
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Appreciate it.

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Post #: 3

RE: 660 Cylinder/Piston Oiling System - 9/6/2008 12:09:32 AM

Chase

Posts: 286
Joined: 7/17/2007
From: Senatobia Ms
Status: offline

sounds interesting!!

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Post #: 4

RE: 660 Cylinder/Piston Oiling System - 9/6/2008 8:33:58 PM

ectrip78

Posts: 111
Joined: 1/24/2008
Status: offline

hauck has my motor rite now doing the 800cc kit with all the head work and goodys set up for 50/50 race gas and 93oct pump gas there service is second to none i just hope they can do a good job see ya

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Post #: 5

RE: 660 Cylinder/Piston Oiling System - 9/6/2008 8:37:27 PM

precision705

Posts: 953
Joined: 5/20/2005
From: cenla
Status: offline

I believe all 4 are correct
but it has been awhile since I've had one apart as well

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RE: 660 Cylinder/Piston Oiling System - 9/6/2008 11:50:27 PM

mud_dog450

Posts: 5527
Joined: 6/20/2004
From: Northeastern Indiana
Status: offline

Thanks Chase!

My build, if everything goes as planned, should be done by spring of '09. It will be my winter project for sure along with paint and an oil cooler as well as well. I might start it sooner, depending on if I get my new job or not.

quote:

ORIGINAL: ectrip78

hauck has my motor rite now doing the 800cc kit with all the head work and goodys set up for 50/50 race gas and 93oct pump gas there service is second to none i just hope they can do a good job see ya

Be sure to write up a little review after you receive everything back. I'd rather purchase the kit and do the work myself because I'm a mechanic. But if they require that they do the work, then I guess I have no other choice.

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