Question about 1999 Yamaha Royal Star XVZ 1300 A

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My Anitfreeze leak

I found my antifreeze leak. There is a ruber plug which also contains stainless steel threads in the center the plug. It is located at the vey top of the crankcase, right below where the cylinder head joins the crankcase. A parts schematic names the plug as "Plug, Special Purpose" Each cylinder has one. The two on the right hand side are seeping. Any ideas?

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Have you checked to see if your bike is building pressure in the radiator? I suspect you may have a blown or leaking head gasket. How many miles do you have on the bike?
Have you drained the coolant and noticed any discoloration? This won't always happen because the system is being "positively charged" which means it may be just getting cylinder pressure.
Those "special purpose plugs" are designed to be a "safety" plug meaning they will blow, leak or seep if the cooling system becomes pressurized from a leaking head gasket. They save the engine but are a pain because the head gasket is not fun to replace.

Posted on Nov 30, 2008

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