MOPED ARMY

Siiiick! That's Lee.

OK.... So idle to 1/2 throttle is all dialed, feels great, not tooo rich b/c the choke makes it 4-stroke immediately.

78 for main was too rich so I dropped to a 76, it four strokes a bit warming up but works out okay after that. When I go WOT for a block or so it makes a lean noise and sometimes bogs out for a second, but at 78 it did it worse so this must be some kind of new rich symptom I never had with an SHA. When I use the choke at WOT it doesn't 4-stroke, it just dies, slows down, then starts 4-stroking at like 20mph.

3/4 throttle (isn't it called "riding the needle") feels too lean, and sometimes when I pull the choke when I'm going fast at 3/4 throttle it has NO effect. I dropped the W7 needle down to position #3 (first before the richest) and it had little effect. Obviously I ought to try #4 but everyone else has theirs' set to #2 so I'm confused.

the plug however gets dark pretty fast, and with 76 jet and W7 at #2 it was BLACK after a few miles of riding, even with those weird sucking, lean feeling symptoms.

Any suggestions? thanks.

I meant to say thanks!

I don't know the carb mm to jetting ratio but everyone with a 19-21mm carb (and huge exhausts) seem to run in the 90s.

60 is my starter/coke jet, the idle/pilot jet is 50.. anyways the low end is fine and fully tunable... my mix screw is on the lean side and it's still rich enough.

I usually tune so it 4-strokes when warming up and as the engine gets hot, starts running normally.

I just put the W7 needle on the richest setting and it 4-strokes at the needle now too, and at the main jet when warming up. So I think I've got the right needle, since I could get it to 4-stroke it seems tunable enough.

When it warms up and breaks from the 4-stroking if I hold at WOT it feels really lean, sounds weird and sometimes it cuts out in a way that makes me REALLY nervous--- like a soft seize or as if I just just pulled the choke. could that be from a fouled plug? My plugs are very dark.

to compound things, my left-side pedal just SNAPPED right off, so I gotta find a replacement with metric threads, ugh.

try a 9 needle in the second leanest position.

sounds like ur on the right track now, and yeah a proper filter is always required for max performance and durability

Thanks Elliot, W9 FTW!

Mid range feels good, a bit rich warming up but pretty healthy after that.

WOT w/ 90 jet 4-strokes for the first 10 minutes or so, after that it really blasts at WOT but feels lean like it has an air leak, but I've checked with carb cleaner... do air leaks pop up suddenly when you're going 40mph? Cause I can't find any leaks at idle. Honestly, it could be that I don't know what a 70cc engine feels like at full rpms, cuz this is my first kitted bike. But yeah, seems like if it 4-strokes for the first 10 minutes, and there isn't an air leak, it shouldn't be lean at WOT.

almost done, siiick.

you're still to rich. You shouldn't 4 stroke, at all. The fact that it cleared up as the motor warmed, indicates you're just barely on the edge of running. Go leaner.