Scratch that. the dodgy plug was the issue, choking is fine
The 1,000 KM break in is a little ambitious. With a few more miles/thrash under the bridge, the old girl is transformed. I rarely go near WOT or over 5,000 RPM but did last night to get around a lorry. The nose lifted, intake roar increased (in 5th) and I was looking at the lorry's lights in my mirrors in a very respectable time. The speedo said [SLOW DOWN] so I did.
As a 650 I compared her to a 250. That is about right. I can image the 450 is indeed comparable to a 125.
I understand squish, forged pistons, porting, carb sizes etc, but this conversion is absolutely spot on. Pulled the plugs (the replacements) tonight and they are perfect. I've avoided lugging the motor (and will continue to do so) but if you want that 'Harley' moment in town, it is there. I keep to premium gas and put small amounts of lead replacement in, but it doesn't seem to care in winter.
Forecast is 9C and no rain tomorrow, so off to work on the bike