Raised my cylinder (.3mm)
shaved 2mm off the top of the exhaust port.
These things are truly adjusted with decimals of mm.
Jack expected that it would get thirstier at WOT - makes sense.
Some unexpected results have followed.
We agreed that figuring out WOT first made sense.
Kept moving leaner.
Kept getting faster.
Ran proper plug chop with an EQ30 - this is 1.5 ~2 points leaner than what I was running the unmodified cylinder on.
Ran a propper plug chop.
To increase time at WOT - I ran in 2nd gear for about a mile.
Editors note: have any of you run your motors at absolute max RPM and just sat on it for a mile? holly cow. My 4stroke redline self had his mind blown.
First surprising observation - it wound up to 10K RPM and just held there.
When I saw it bouncing from 9,900-10,000 - I thought - DAMN! The Koso rev counter thingy has fallen off or something.
Then I realized - holy cow (but in my mind, I spelled it wholly cause Im not very good at spelling) - this thing is doing 10K RPM!
The sound was spectacular - can't explain - shame I didnt film.
- So Jack - max RPM is not in the 8k's. It's 10K.
the 3rd gear max's we've seen are being limited by torque to pull my rig in 3rd to max RPM.
Second - as I have taken it leaner today - the max RPM has moved up to 8800 with a peak at 8900 RPM - in 3rd gear
This along with the plug chop confirms to me that the alterations we made to the motor are demanding leaner - not richer - WOT needs.
Why? I have NFI.
Third - there appears to be a little bit of loss of torque in the 3500-4500RPM range. This may seem like nothing - but will cause some subtle adjustments to how I drive. In an ideal world - this would be recoverable to at least what we had.
One note. I am using an EQ metering rod (aka jet) that I had in a 30. This is probably right for the top - but I suspect I am a little rich in the first 1/2 of the throttle. To get to a more enjoyable "smart carb esque" feel through the throttle range - and before I pass judgment on these timings - I need to get a rod in the EK range in a 30. (EK are leaner in the first half of the throttle).
Plug chop - 10K RPM mile run. Ring is only .5 ~ .75 tall - but color seams dead nuts on. Comments?
little fall off between 3500 and 4500 RPM - but this is at WOT. Once I jet lower part of throttle properly - I may find myself not in this range too often. We will see.