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04 450f problem

10 posts in this topic

I would do a search, but i don't know what this part is. I cant find it in the service manual that came with the bike either? On the head where the xhaust mounts up, directly above that There is a hole that i think use to have some sorta plug in it. There is noting there now and so oil came out of the hole. I found one picture in the manual section 4-82 that shows a bolt or plug there. What is it called and why is it not anywhere in the service manual. :thumbsup: HEEELLLLLPPPPPP

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Sounds like the hole where they used to run the decompression mech. Check in the TT store for Decompression Plug. Hope this helps.

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I was thinking that. I saw that TT has some special plug that is made not to blow out. but when i was reading the part description it was talking about a cam swap. I'll go back and check it out. What kinda of problem can occure from this plug blowing out? I think i caught it right after it happened.

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The hole was there back when Yamaha used the manual decompression lever. When they went to auto-decompression, they didn't want to spend the money to re-tool the head (expensive), so they installed a rubber plug.

Sometimes it comes out, and that's what happened to you....order the new Aftermarket one from TT, and your problems are gone.

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When they went to auto-decompression, they didn't want to spend the money to re-tool the head (expensive), so they installed a rubber plug.
Their actual reason for this was to allow retrofitting manual decompression, and they offered a complete kit to accomplish that.

They designed it out of the '06 head, since almost no one wanted to add the kit.

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Oops, my bad....Grayracer is correct. I wrote that with my three year old and 4 month old crying, and had a Brain fart.

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Their actual reason for this was to allow retrofitting manual decompression, and they offered a complete kit to accomplish that.

They designed it out of the '06 head, since almost no one wanted to add the kit.

i thought i already had that. the lever above the clutch lever

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