Jay have you used the information in the parts list and manuals area of the forum because it has detailed info on the carby.
If you can post a video of it running I might be able to point you in the right direction as I can usually tell by the sound of the engine running if it is a decompressor or not.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.