26-10-18, 07:50 AM
I don't know if they still do it but manufacturers always used to quote max BHP figures taken from the crank rather than the rear wheel which is most likely where the 143 BHP figure comes from. The rule of thumb is that you get about 15% power loss from the drivetrain between the crank and the rear wheel so from 143 at the crank you would expect around 121.5 at the wheel. Hence if you check Ivan's Dyno Charts you'll see that his benchmark bike at stock made 121.7.
As dazza says with an Ivan's kit you can expect mid 130's or higher if you invest in (if you can find one) a top quality replacement exhaust system.
As dazza says with an Ivan's kit you can expect mid 130's or higher if you invest in (if you can find one) a top quality replacement exhaust system.