If I recall correctly, the Boyesen bowl is a pretty roundy thing. Would be hard to put in an access with no boss to put it into.
Gee..you keep good track! Your setup is so different from average..big bore, ported and all..you may well be in your own speshul place as far as jetting goes.
I put in a rad valve two weeks back. I dropped from a 150 main (which had WOT checked OK) to a 148 based on the 'drop a size or two' notes from Boyesen. Not a good idea. For one thing, I went on reserve @ 50 miles. THAT was a surprise. Later did a WOT with the 148. Oops! Plug was clean as a pin. Spotless. No color at all. Wasn't a brand new plug, but fairly. I'd just fouled one probably 45 minutes earlier (a B7ES).
What a strange juxtaposition of circumstances!
Rode the next weekend: 42-150-AEN/3-AS/.5. Didn't foul a plug during the ride. Didn't get to a decent WOT check spot, either. I went out 5/8 on the AS. Response took a dive. @ .5 it was perfect.
The 5/8 out setting made the bike a tad slow on the uptake in 2nd gear..and when it hit it hit hard! Too hard to be able to control it well on a granite, slippery, rooty, rocky uphill. Too much of an inadvertent wheelie opportunity (read, 'he looped it!'). With just 1/8 in..completely different story. Lost the 'slow on the uptake' part. Traded the 'hit' part for an electric motor-like strong pull in 1st and 2nd. Incredible response. It was great!!
Which is a long and boring way of saying I don't see how going to a 40 is going to work for me. I'll change plugs every weekend to keep that consistent, hard, even pull on uphills that I can barely even STAND on!!
We rode in a few spots last weekend where wheelspin was a bad thing. You wouldn't make it! And the uphills were long enough that there wasn't a 'head start' sort of chance.
Anyway..currently @ 42-150-AEN/3-AS.5
Temps: 75-85º
El: 2000-3500' (from GPS)
Slide: Still the #7. I have a #6. The 'shutup and ride' applies to
that. Haven't taken the time to know more than it would take some
work to get that setup right.
FMF KG-35
PC S/A
Boyesen rad valve (carbon pro reeds..all they have for a kdx)
I know the RB mod makes the pilot circuit act funny. I'll try the 40 just to see if I can clean up the plug and still keep the strong pull I have now.
Oh..this is going to be important. I retarded the timing one 'notch'. The wonderful bottom end my bike has now is certainly due in part to that. Don't know how much, as I haven't changed the timing back to 'stock' (middle mark) except at my house. That's about 1300' el..and I know from past experience that I cannot jet the bike at the house and have it run for diddle just a couple thousand feet up! At the house though, I changed the timing back and forth a few times (all the fun of rejetting without the gas!) and really liked the retarded setting. I think that (timing) would be less of a 'environmental' (el, temp, humidity) issue, so I would expect the improvement to be better 'up' as well as 'down' at home.
Head to head with a similarly setup 200 (my riding buddy has a DeltaForce block that they made specially for him to check out), he couldn't catch me if I got ANY jump on him..I couldn't catch him likewise. Pretty close. His timing is 'stock'. My bike pulls MUCH better (sez me) in the off-idle area. He's probably 20# lighter than I am. That's gotta figure in there somewheres.
This KDX has really gotten under my skin. I swear I live for the weekend! I haven't had my honda out but once this year! I bought a vehicle and a trailer JUST to haul it around. Talk about a 'black hole'....oh YEAH!!