Yes, there are some limitations. please read my blog for more details
(413) Request Entity Too Large[
^]
http://tharakaweb.com/2012/12/11/413-request-entity-too-large/[
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In addition, when you are serializing JSON also have some limitations. you can avoid this by modifying your web.config file as follows
<configuration>
<system.web.extensions>
<scripting>
<webservices>
<jsonserialization maxjsonlength="102400" />
</webservices>
</scripting>
</system.web.extensions>
</configuration>