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old styleRCMK s520 - 11/18/2012 5:22 PM   
Jackal1983


 

Posts: 218
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Joined: 10/12/2010
Last Login: 5/24/2013
From: Preston, UNITED KINGDOM
Status: offline 		Hi Guys,

Anyone running the old style RCMK S520 bottom end??? with the split crank and coupler??? i know they where recalled when they first come out.
what was happening to them when they broke? snapping crank????


jack


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RE: old styleRCMK s520 - 11/19/2012 5:02 AM   
Ron Olson



Posts: 17516
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Joined: 5/10/2002
Last Login: 5/25/2013
From: Kalamazoo, MI, USA
Status: offline 		Bearing issues mostly. The crank wasn't the brightest idea in the world either which didn't help matters.

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RE: old styleRCMK s520 - 11/19/2012 10:54 PM   
Boss 330


 

Posts: 31
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Joined: 2/12/2011
Last Login: 1/2/2013
From: Vero Beach, FL, USA
Status: offline
quote:

ORIGINAL: Jackal1983

Hi Guys,

Anyone running the old style RCMK S520 bottom end??? with the split crank and coupler??? i know they where recalled when they first come out.
what was happening to them when they broke? snapping crank????


jack



The first version bottom ends are junk. The crankshaft was made up from two single cyl.cranks. I broke two before the boat made it off the bench. the cranks break at the center.  Only a small number were sold . Two months later Mr Park released a new design that has a single piece crank. The second version is a great engine. I have 4 and run 2-3 times a week.

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RE: old styleRCMK s520 - 11/20/2012 5:12 PM   
V8Rider


 

Posts: 253
Score: 100
Joined: 6/29/2007
Last Login: 5/24/2013
From: Cranston, RI, USA
Status: offline 		Hey Al,
I know you run your inlines a lot. So what is the trick to keeping the flywheel from coming loose? Are you using an EZ Start? I just ordered the EZ Start with the steel starter pawl that Gizmo sells along with flywheel #3! I am hoping the steel pawl will hold better than the aluminum one from the first EZ Starter.
Rick

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RE: old styleRCMK s520 - 11/21/2012 12:10 AM   
Boss 330


 

Posts: 31
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Joined: 2/12/2011
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From: Vero Beach, FL, USA
Status: offline
quote:

ORIGINAL: V8Rider

Hey Al,
I know you run your inlines a lot. So what is the trick to keeping the flywheel from coming loose? Are you using an EZ Start? I just ordered the EZ Start with the steel starter pawl that Gizmo sells along with flywheel #3! I am hoping the steel pawl will hold better than the aluminum one from the first EZ Starter.
Rick


Use a steel nut to seat the flywheel, Piston stop is a no no. I put the flywheel on before the pistons/cylinders on. Use a plastic screwdriver handle to wedge the crank and seat the flywheel with a steel nut (Tight) remove the steel nut then install the EZ start pawl using red Loctite on the threads.If you are using a thin front mount the pawl can contact  the starter with enough force to unscrew the pawl.


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RE: old styleRCMK s520 - 11/21/2012 7:59 PM   
V8Rider


 

Posts: 253
Score: 100
Joined: 6/29/2007
Last Login: 5/24/2013
From: Cranston, RI, USA
Status: offline 		The steel nut sounds like a good idea. I am using a Gizmomotors motor mount set up. It does not look to be thin but I will check for clearance between the pawl and starter just to be sure. Thanks for yor help.
Rick

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