Official PC20 Carb Thread

Official PC20 Carb Thread
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Post your spec set-up of your PC20.

Brand of PC20: Keihin or Sheng Wei
Main Jet:
Pilot Jet:
Needle setting:
A/F screw turn:
Elevation:
Air Filter:
Intake pipe length:

Other Engine Mods:

How does your set-up run?

Advice that keeps your PC20 running like a champ?:

Meaningless info will be flagged or delete to keep this thread as clean as possible.

I think i ran a Sheng Wei
Main Jet: 78
Pilot Jet: 53
Needle setting: middle
A/F screw turn: 2 turns
No Air Filter just a velocity stack Polini variator port matched intake manifold, 5.5 gram weights, belt. red contra spring lightened flywheel, Dio wheels motul300V oil. Hot spark plug and advanced Timing CDI.

Advice that keeps your PC20 running like a champ?: check the plug. Want a dry dark brown. Also size of tire makes a huge difference. Bigger the tire, slower the acceleration. I still apply these methods now on my 232cc GY6

GF’s ruck
Brand of PC20: Random China eBay
Main Jet: 75
Pilot Jet: 38
Needle setting: 1 up from bottom
A/F screw turn: no idea, set with a wideband
Elevation: sea level
Air Filter: Takegawa velocity stack with pancake filter
Intake pipe length: ~3”

Other Engine Mods: Ported head, shave .020”, Ruckhouse manifold, Yoshi TRC, lightened flywheel, advanced timing pickup, Polini vari w/ 30g, OE belt, stock clutch with blue engagement spring, 12x8 140/70 rear, full met gears

How does your set-up run? 50 sitting up, high high 50s any day, low 60s when the weather is right.

Advice that keeps your PC20 running like a champ? Wideband tune it, don’t guess

My Ruck
Brand of PC20: Keihin PC10
Main Jet: 82
Pilot Jet: 38
Needle setting: I think 1 up from bottom
A/F screw turn: no idea, set with wideband
Elevation: sea level
Air Filter: 38 to 32mm reducer with Ronk stack, no filter
Intake pipe length: 5” probably
Other Engine Mods: Ported head, lightened fly, advanced timing pickup, JC cast manifold, Jst4shw EDZ overhead exhaust, Polini vari w/30g, OE belt, stock clutch with blue engage springs, NCY Dio rep wheels with 120/90, full Met gears

How does your set-up run? Decent, nothing spectacular. Engine is temporary until the 4 valve is done

Advice that keeps your PC20 running like a champ? Wideband tune it