They do have a decompresser built into the cam gear, i have seen one but can't remember right now. A troll through the forum should get you more info.

Entire Thread
Subject	Posted By	Posted
Scott Bonnar SX4000 Starter mechanism	sparker	23/04/16 04:58 PM
Re: Scott Bonnar SX4000 Starter mechanism	vccomm	23/04/16 05:28 PM
Re: Scott Bonnar SX4000 Starter mechanism	sparker	23/04/16 05:39 PM
Re: Scott Bonnar SX4000 Starter mechanism	vccomm	23/04/16 05:46 PM
Re: Scott Bonnar SX4000 Starter mechanism	sparker	24/04/16 10:01 AM
Re: Scott Bonnar SX4000 Starter mechanism	vccomm	24/04/16 11:53 AM
Re: Scott Bonnar SX4000 Starter mechanism	bigted	25/04/16 12:20 AM
Re: Scott Bonnar SX4000 Starter mechanism	vccomm	25/04/16 09:44 AM
Re: Scott Bonnar SX4000 Starter mechanism	sparker	26/04/16 09:07 AM
Re: Scott Bonnar SX4000 Starter mechanism	sparker	26/04/16 09:51 AM
Re: Scott Bonnar SX4000 Starter mechanism	sparker	04/05/16 04:43 PM
Re: Scott Bonnar SX4000 Starter mechanism	Jaffa J	08/05/16 04:59 PM

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