The 'Star-Tuner' is a simple, in-house-produced tool for setting and tuning the Walbro WB carburettor.
It was initially designed in 2012 to meet the needs for tuning the Vittorazi Moster Classic engines in our workshop. After some persuasion and a rethink, we have made it available to other Walbro WB carb users.
It accurately allows you to set the low jet to the factory standard state of tune by minutes of turns out from the closed position. It also provides a way of checking the current state of tune by measuring the tunes back in. There are times when the carburettor needs the slightest adjustment, and this tool allows you to achieve this confidently with a visual datum of movement.
The tool has a 360-degree turntable head with 1-minute markings around its edge. Four black cardinal points (15-minute spacings) are referenced against the head, which is held in position by the high jet post.
The tool is designed to be permanently left on, with a lanyard for backup.
You may find that your current low jet has been de-faced if tuned in the past with a screwdriver, and we recommend replacing the low jet with a new one for the best fitting results. Some WB carbs have a T-bar high jet (Moster Factory). The bar (roll pin) must be removed from the high jet if fitting the Star-Tuner.
Below are the low jets settings for the WB; please refer to the Vittorazi User Manual and Maintenace Manual, which can be found on their website.
Atom = 22mins out
Moster Silent/Plus = 15mins out
Moster Factory R = 32mins out
Moster Classic = 15-20 mins out
Fly Easy/Evo = 15-20 mins out
When removing the tool, pull it off straight without wiggling or creating a side load on the blade. Doing so will damage the tool, rendering it useless, and it can not be fixed due to the assembly process.
Also, consider our Walbro High Jet Tuning Tool
Walbro carburettor is for illustration purposes only.