Bike year & model = 2011 EC300E fitted with 36mm x 39mm oval bore modified Keihin PWK ASII carb and reed block spacer and fitted with modified head (squish - 1.28mm, compression ratio - 12.7:1)
Temperature (degC) = 20-25 degC,
65% - 80% humidity
Elevation (feet) = 1000f, or 100 - 300m.
Main jet = 180
Pilot jet = 42
Needle & notch =N3CH #3
Air screw setting = 1 turn out
Throttle valve/slide = 6.5 notched
Results:
Great torquey power which will happily lug just at idle all day and then respond crisply when required. Nice meaty (read fun) hit of mid-range power which builds and explodes into a screaming top end. With the 180 main and needle in clip 3 it was slightly rich throughout the needle/main jet circuits so smoothed the hit somewhat. This came at the expense of fuel economy: 5.2l fuel used for 35k's = 14.8l per 100k's.
I swapped to a 178 main and needle in clip 2. The awesome torque is still there but it now has a ridiculous hit into the mid and top end. Its fun and would be a good MX setup, but it is really hard work through tight trails. Better fuel economy but still not as good as I'd hoped. Used 2.9l for 23k's = 12.6l per 100k's.
I think I'll move up to a W diameter needle, the modded carb seems to like a leaner diameter compared to the std 36mm.
|