The high velocity air flow means a stronger vacuum at the needle jet for more precise metering, better throttle response.. Type - compatible with TM. Needle Jet - (389)Q-6. Throttle replacement valve Cutaway - 4.0.
Air Jet - 2.5. Needle replacement valve - 3.3.
On the continent of North America. Photos are for reference only. Actual product may differ from the item shown in photograph.