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X30 Carburettor

X30 HW-27A – springs & pop-off

Standard: 37 g Pop-off ≈ 0.75 bar (≈10.9 psi) • Reseal ≈ 0.55–0.60 bar (≈8.0–8.7 psi) on a healthy HW-27A.

At a glance: Lower grams = earlier opening (richer low/mid). Higher grams = later opening (leaner low, sharper top). Always start at 37 g and adjust needles before changing springs.

What each spring does

26 g 24-B323X – lowest pop-off

Effect: Very early opening → clearly rich low/mid; eager off corners.

Use when: Mini Swift standard; rarely X30 unless low temp/low grip demands extra fuel down low.

31 g 24-C296X

Effect: Richer than 37 g in low/mid; better bite in cold/low grip.

Use when: Common in restricted classes (e.g., TAG Restricted).

37 g 24-B299X – X30 standard

Effect: All-round balance. Pop-off ~0.75 bar / reseal 0.55–0.60 bar.

Use when: Default baseline.

42 g 24-C298X

Effect: Later opening → leaner low/mid; cleaner transition with high grip/warm air.

Use when: Fast tracks/high grip to “tighten” the bottom end.

46 g 24-C297X

Effect: Latest opening → leanest low; sharp top, often needs richer L to avoid hesitation.

Use when: Specific high-RPM scenarios — measure pop-off.

Practical tips for HW-27A

Standard spring is 37 g — Check with a carb tester (open ~0.70–0.75; must stop at ~0.55). If it still drops, replace the needle valve.

Factory baseline: Junior L: 1.00 • H: 1.20–1.25 — Senior L: 1.00 • H: 1.30–1.35 (minutes on the screw).

Need more punch? Cold/low grip: try 31 g and/or open L slightly.

Too rich down low? Hot/high grip: consider 42 g and close L back.

Maintenance: Replace diaphragm kit regularly; every other time use the kit incl. needle valve.

KA/X30 note: Higher pop-off often needs richer L and can soften mid-range response.

Throttle plate fully vertical at WOT

Important: At WOT the plate must be fully vertical. 90–95% opening shadows the airflow → lower top speed. Consider this template tool for quick, precise setup.

X30 HW-27A – Federn & Pop-off

Standard: 37 g Pop-off ≈ 0,75 bar • Reseal ≈ 0,55–0,60 bar.

Kurzfassung: Niedrigeres Gewicht = frühere Öffnung (fetter unten/mitte). Höheres Gewicht = spätere Öffnung (magerer unten, schärfere Spitze). Starte bei 37 g.

Wirkung der Federn

26 g 24-B323X – niedrigstes Pop-off

Wirkung: Sehr frühe Öffnung → klar fett unten/mitte; sehr willig am Kurvenausgang.

Einsatz: Mini Swift Standard; selten X30, außer bei wenig Grip/niedriger Temp.

31 g 24-C296X

Wirkung: Fetter als 37 g unten/mitte; besserer Biss bei kalt/wenig Grip.

Einsatz: Häufig in Restriktor-Klassen.

37 g 24-B299X – X30 Standard

Wirkung: Ausgewogene Basis. Pop-off ~0,75 / Reseal 0,55–0,60 bar.

Einsatz: Baseline.

42 g 24-C298X

Wirkung: Spätere Öffnung → mager unten/mitte; sauberer Übergang bei hohem Grip/warmer Luft.

Einsatz: Schnelle Strecken/hoher Grip, um den unteren Bereich zu straffen.

46 g 24-C297X

Wirkung: Späteste Öffnung → am magersten unten; scharfe Spitze, oft reichere L nötig.

Einsatz: Spezifische High-RPM-Szenarien — Pop-off messen.

Praxis-Tipps HW-27A

Standardfeder 37 g — Test mit Vergaser-Tester (Öffnen ~0,70–0,75; Stopp ~0,55). Fällt weiter → Nadelventil tauschen.

Werks-Baseline: Junior L: 1.00 • H: 1.20–1.25 — Senior L: 1.00 • H: 1.30–1.35.

Mehr Punch? Kalt/wenig Grip: 31 g testen und/oder L etwas öffnen.

Zu fett unten? Warm/hoher Grip: 42 g erwägen und L zurück.

Wartung: Membransatz regelmäßig; jeden zweiten Service Satz inkl. Nadelventil.

Drosselklappe senkrecht bei Vollgas

Wichtig: Bei Vollgas muss die Klappe senkrecht stehen. 90–95 % → Schatten im Luftstrom → weniger Topspeed. Werkzeug-Schablone: hier.

X30 HW-27A – muelles & pop-off

Estándar: 37 g Pop-off ≈ 0,75 bar • Reseal ≈ 0,55–0,60 bar.

Resumen: Menos gramos = apertura más temprana (más rico abajo/medio). Más gramos = apertura más tardía (más pobre abajo, punta más afilada). Empieza en 37 g.

Qué hace cada muelle

26 g 24-B323X – pop-off más bajo

Efecto: Apertura muy temprana → claro enriquecimiento abajo/medio; muy ágil a la salida.

Uso: Mini Swift estándar; raramente X30 salvo poco agarre/baja temperatura.

31 g 24-C296X

Efecto: Más rico que 37 g abajo/medio; mejor “bite” en frío/bajo agarre.

Uso: Común en clases restringidas.

37 g 24-B299X – estándar X30

Efecto: Equilibrio general. Pop-off ~0,75 / reseal 0,55–0,60 bar.

Uso: Base por defecto.

42 g 24-C298X

Efecto: Apertura más tardía → más pobre abajo/medio; transición limpia con alto grip/aire cálido.

Uso: Pistas rápidas/alto agarre para “tensar” el fondo.

46 g 24-C297X

Efecto: Apertura más tardía → lo más pobre abajo; punta aguda, suele requerir L más rico.

Uso: Escenarios de alto régimen — medir pop-off.

Consejos prácticos HW-27A

El muelle estándar es 37 g — Verifica con probador (abre ~0,70–0,75; debe parar ~0,55). Si sigue cayendo → cambia la válvula de aguja.

Base de fábrica: Junior L: 1.00 • H: 1.20–1.25 — Senior L: 1.00 • H: 1.30–1.35.

¿Más salida? Frío/bajo agarre: prueba 31 g y/o abre L un poco.

¿Demasiado rico abajo? Calor/alto agarre: considera 42 g y cierra L.

Mantenimiento: Sustituye el kit de membranas con regularidad; cada dos servicios usa el kit con válvula.

Mariposa vertical a gas a fondo

Importante: A fondo, la mariposa debe estar vertical. 90–95 % sombrea el flujo → menos velocidad punta. Útil esta plantilla.

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