Missing coolant passage plug on cylinder head...what to use?

[Lug Nut]

I am flushing my coolant on my 97 RSTC and when I removed the fins to access the rubber plugs to get all the coolant I found one of them missing. Is there anything I can use in place of a stock one? Non yamaha dealer in my city and don't want to wait a week to order one online

[RedRider]

House of Honda / Yamaha should be able to get it next day.

 

Part number is 90338-11152-00. I believe they are about $5 each. With the age of your bike, I suggest buying 4 and replacing them all.

 

RR

[Freebird]

It's got to be there somewhere. It it was missing before, it would have been leaking.

[Lug Nut]

Ingot a solid rubber stopper from the hardware store for .20....works great. Got it all back together and no leaks. .