Yup, I've never been very good at getting on the power.
Hp makes all the difference once you start clicking up the box though.
Infact though your motor is almost identical to mine in the bottom and middle, I think it even had a touch more down around the 6K mark. Mine has to pull a fair bit more weight mind lol
You need to have a go on the latest incarnation.
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If I have to take the carbs off once more...