I have a 865 I do not know about the 790 I would Email Thunderbike and ask as they are very helpful.I can't imagine the 790 cams are anything like Tbike cams as they are dramatically different and I have never heard a 790 sound anything like mine does now.
Here is their Email FYI Jason Howcroft [tbikeproducts@thunderbike.co.nz]
