Newby oil injection question

[454man]

This might sound like a stupid question but i have to ask.
I have a 94 merc 150 xri and am removing the oil injection system, i have found a post on the site with pics and is very helpful, but it stated that you have to time the engine after this is done. I am trying to understand the reason why because it looks like i have not touched any part that would have moved it.
Any help would be appreciated
Thanks
Daniel

[samari]

I bet in the post they also removed the idle controll box. If you are only removing the oil injection there is no need to retime.

[454man]

Is there any advantage to removing the idle control box,
this is the post i was looking at http://www.screamandfly.com/showthre...ge2&highlight=, it has you removing two black boxes on the port side of the motor, not sure what they are. I just dont want to mess any thing up before i fire it up when i am done.
thanks

[samari]

They are extra parts to fail, I have herd of them failing and advancing.