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trunkmonkey55

weird stupid plug thingy

9 posts in this topic

I have a 04 WR450F. On the front of the motor there is a weird rubberized plug that plugs a hole in the motor. anyway the plug falls out and hot oil drips all over my right leg. ive had to buy 3 plugs already. if anybody knows what im talking about and how to fix this little prob. please let me know. Thanks. Jake :D

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I think that is the decomp plug you are talking about. TT store sells them with the ability to lock them with the existing side bolt. :D

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I think that is the decomp plug you are talking about. TT store sells them with the ability to lock them with the existing side bolt. :D
Buy one of These , then check your breather to make sure it isn't pinched off or blocked.

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The TT decomp plug mentioned by Greyracer will solve your problem, just don't over tighten the retention screw. It only gets tightened to 5 ft/lbs and a drop of red loctite on the threads won't hurt either.

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What I can't figure is out it why the 03 and up still have a plug in that location. With auto decompress it's no longer used. Did Yamaha have a bunch of 426 heads they wanted to use up

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For the 03's and newer Yamaha still lists the manual decomp parts kit as an option. Some guys like both for clearing their engine after submerging it. I don't think Yamaha sold many of the kits, especially after everyone who converted their 00-02 bikes over they were giving the manual decomps away on TT.

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For the 03's and newer Yamaha still lists the manual decomp parts kit as an option. Some guys like both for clearing their engine after submerging it. I don't think Yamaha sold many of the kits, especially after everyone who converted their 00-02 bikes over they were giving the manual decomps away on TT.

Cool..... I learn something new every day :D

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For the 03's and newer Yamaha still lists the manual decomp parts kit as an option. Some guys like both for clearing their engine after submerging it. I don't think Yamaha sold many of the kits, especially after everyone who converted their 00-02 bikes over they were giving the manual decomps away on TT.

I think they were just too cheap to re-tool. Lame because they could have eliminated the plug and bolt, along with the labor to install the parts :D

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Retooling expense isn't the answer. The 450 head is already a totally different part. They provided the option deliberately. As old school as I am, I originally intended to buy the kit after I got the 450, but after owning the thing for a while, I just don't see a reason.

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