IAME KA100 Suggested Carburettor Settings

TILLOTSON HW-33A

Updated 20/06/2019

KA4 RESTRICTED
- Low Jet: 1 hour & 10-15 mins
- High Jet: 45-50 mins
- Inlet Spring: 31 gram (8-9psi pop off)
- Lever Height: Top of lever flush with metering body

KA3 UNRESTRICTED
- Low Jet: 1 hour - 1 hour 10 mins
- High Jet: 1 hour - 1 hour 5 mins
- Inlet Spring: 31-37 gram (8-11psi pop off depending on spring)
- Lever Height: Top of lever flush with metering body

TIP: A higher pop off pressure will generally require a richer setting on the low jet to give the engine enough fuel off the turn. As a result, due to the efficiency of the low jet circuit, this richer setting will deliver too much fuel in the mid range RPM causing the engine to feel sluggish. Therefore it is recommended to avoid using a very high pop off pressure.

TILLOTSON HL-398A

KA4 RESTRICTED
Low Jet: 1 hour & 45 minutes (1 & 3/4 turn out)
High Jet: 45 minutes (3/4 turn out)

KA3 UNRESTRICTED
Low Jet: 1 hour & 45 to 55 minutes (Just under 2 turns out)
High Jet: 45 minutes (3/4 turn out)

Idle Screw
Screw in until the engine idles at 2,000 to 2,500 RPM, this makes starting the engine very easy.

Pop-Off Pressure
8 to 10 PSI

Metering Lever Height
Top of the lever should be dead-level with the Carby body.