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If you mean the pipe coming from the top , it is the crankcase breather.
run the bike for a few minutes then check the oil level, in case it is overfull.
If this only happened after the service its the most likely cause

my man, tony, dudeski, im a yamaha mechanic in idaho. your problem my friend is a valve adjustment. your valves are loose enough when cold to run with some compression but when warmed up they become to tight...therefore not enough compression to fire. easy fix too.

Go to this site and you can download a free PDF service manual. The site may take up to 20 seconds to load the complete list of manuals. www.carlsalter.com/motorcycle-manuals.asp Most all of the manuals are in English but some are not. There is no way to be sure without doing the download. You can always delete it if in a foreign language.

There is a 2002 WR / CR 250 and WR 360 manual in the listings. The service procedures are the same for your 2004 bike. Please take a moment and rate my answer. Thanks!

The drain plug is at the bottom left corner of the center case. The oil filter is on the left case cover.

A “very helpful” rating on this answer? Thanks!

The machine thinks the yellow ink chute isn't working. The inkloader may be jammed or defective.

If you can't un-jam it, you will need to replace the inkloader.

-Whit :)