I wouldn't try it. Get a proper gasket. It's a long, narrow bead and doing it fast enough to keep it wet without over or under doing any part would be difficult. There's also a double coolant passage under pressure that has special sealant on the gasket. RTV silicone squeeze out likes to ball up, break off and dam oil passages if over applied.
I agree with Greywolf. Silicone is a real problem when it gets inside an engine! If you simply must try to get the bike back together till the new gasket comes in, I would try using Hylomar around the coolant ports. I done this during testing with no coolant leaks. I used one gasket 7 times! But they were only on there for at most a couple hundred miles.
Im just impatient but am learning patience.. This week is suppose to finally be a good sunny week with some warmer temps and I just put this engine in so I was hoping to get some seat time with the better weather.. I do a lot of alone long distance riding and don't want to risk either of the water ports leaking. I will wait, I just don't want to.. :frown: Guess I'll ride the KLR..
If your old gasket came off without really falling apart (the teflon coating kind of flakes, no matter what), re-use it. What's the harm if it doesn't work? It'll leak a little. Big whoop...you have another on order when the new one shows up put it on and there ya go.
I re-used mine that way, and 2,000 miles later it's still leak-free, just fine. Plus, I have a spare or one for the next time I have to pull it.
I wouldn't re-use prior to a trip or something, but for me it was worth the small gamble.
I reused mine too with a very light coat of black RTV at the water jackets. I have no leak problems. I also have been assembling engines for years and have used the RTV silicones in many applications with out any trouble. If you go gooping it on there in large blobs I can see trouble.
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