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One indy I know suggests replacing intake seals every three to four years.
I've replaced them on several of our bikes as preventative maintenence as a severe leak can cause a piston or valve to burn.
It's a little work, but when you're trying to diagnose a problem you first have to know wht the problem isn't before you can find out what it is.
Also, making sure that you have a fully charged battery (with cable connectors checked on each end), fresh spark plugs and fresh fuel can make traceing problem much easier.
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