No, we do not have a standard compilation of such things. Putting one together would be nice.
I use the AutoReviewComments extension, which automatically adds "Welcome to Bicycles!" when replying to a new user.
For a starter, here's my set of automatic comments that I actually use:
[A] is comments on Answers,
[Q] is comments on questions,
$SITEURL$ gets automatically changed to
###[A] Nothing but a URL (and isn't spam)
While this may theoretically answer the question,
[it would be preferable](http://meta.stackexchange.com/q/8259) to include
the essential parts of the answer here, and provide the link for reference.
###[A] Comment as answer
This is really a comment, not an answer. With a bit more rep,
[you will be able to post comments](http://$SITEURL$/privileges/comment).
For the moment I've migrated this to a comment for you.
###[A] Not an answer
Please use the *Post answer* button only for actual answers.
This doesn't seem to answer the question in any way.
###[A] Needs more detail
We're looking for answers with **more detail**.
Please give us some *reasons* and *explanation*, **not just a one-line answer**.
A short answer like this with no explanation is likely to be deleted.
###[Q] Insufficient Detail
We really need more information to give you a good answer.
Could you be more specific?
Perhaps consider including some pictures, both of the overall bike and the specific areas?
Vague questions without enough detail to be answerable are likely to be removed.
###[Q] Pictures, Pictures, Pictures!
**Pictures, Pictures, Pictures!**
For most mechanical problems, it can be very helpful to include detailed
pictures of the problem areas from multiple angles, and possibly also an
overall shot of the bike.
###[Q] Q&A is hard, let's go shopping!
It's best if your question is more about how to look for what you want,
rather than looking for specific product recommendations.
Specific product recommendations can be problematic because not all products
are available in all areas and products change year to year.
See also: [Q&A is Hard, Let’s Go Shopping!](http://blog.stackoverflow.com/2010/11/qa-is-hard-lets-go-shopping/).