About a year ago I finished completely rebuilding my project bike. It looks great and sounds great with completely rebuilt engine and carbs, a Delkevic 4:1, paint, modern headlight, etc.
However, I've ridden it less than 500 miles.
It's fussy, and I've struggled to get the carbs tuned.
I need some "been there, done this" advice from the group. Thank you in advance.
Important Specifics
- Carbs completely disassembled and ultrasonically cleaned
- Carb internals are new - float valves, jets, etc
- "10 Cent Rejet" (shimming the needles with a thin washer) when I had the carbs compeletely apart
- K&N air filter, which some conventional wisdoms says "don't worry about your jetting" and others say "well, what else have you done"
- Delkevic 4:1 full system (with 14" Round Muffler)
- Once warm, it idles ONLY on half choke (enrichment)
- It revs fine on half-choke
- It revs fine on no-choke if I started revving it first on half-choke
- I've synced the carbs while idling on half-choke
- Idle enrichment screws are already FOUR TURNS OUT (started at two turns out)
- If I mostly cover the airbox inlet with my hand and push the choke all the way in (no enrichment), and mess with the idle adjustment knob, it WILL IDLE (carbs still decently synced)
- While riding the bike, it revs and pulls just fine with the choke all the way in (no enrichment) but conks out at every stop sign unless I keep the throttle twisted (or pull out the choke)
- Bluing on pipes 1 & 4 (see pics, below) is new from tuning on the bike today - was a nice straw/stainless color previously. Indicates excessive temps, which means lean conditions, right?
- Bluing on pipes 2 & 3 was from earlier poor-sync situation within the first 100 miles
- I have NOT done a plug chop test since right now I'm focusing on getting it to idle (I'll worry about maximizing performance at WOT later.)
Perhaps I need to step up the pilot jets? Or push it into the lake?
Who else is running a K&N air filter and a 4:1? What did you do for carb tuning?
Pics for fun...