Awoonga:
l have had the 115 .And l now have the 115HO .pm me with any questions that you might have. l may be able to help.
PMC:
The major difference is the HO is factory worked and might be a bit sharper out of the hole The HO will use a bit more oil than the 130 is its expected that you are going to use it for sports use ;D Ie, flat out!!! Pretty much identical engine otherwise