The Star-Tuner MK-2*, affectionately known as the 'Boo-Hoo', is a simple-to-use, in-house-designed and produced tool for accurately setting and tuning the low-jet needle on the Walbro WB carburettor.
It was initially designed in 2012 in a simpler form to meet the needs for tuning the Vittorazi Moster Classic engines in our workshop. After some persuasion and a rethink, we have now made it available to benefit other Walbro WB carb users. It is designed to stay permanently connected to the carburettor, allowing for adjustments on the go.
It accurately allows you to set the low jet to the factory-standard state of tune by the recommended minutes of turns out from the closed position. It also provides a way of checking the current state of tune by measuring the turns back in. There are times when the carburettor may need the slightest of adjustments before flight (bogging, constant priming to start, or deing when bending down to pick up risers). This tool allows you to achieve this easily, quickly, and 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 with the aid of the high jet post.
The tool is designed to stay on permanently, secured by a screw-down clamp and a aditinal lanyard for backup.
You may find that your current low jet slot has been de-faced if it was tuned with a mismatched screwdriver in the past, and we recommend replacing the low jet needle with a new one for the best fit. Some WB carbs have a T-bar high jet (Moster Factory). The bar (roll pin) will need to be removed from the high jet if fitting the Star-Tuner.
Due to past issues with customs and lost parcels, we do not ship outside the UK unless you have a contact in the UK who can forward it to you.
Below is a list of trusted outlets outside the UK. If you are a paramotor business outside the UK and publicly recognised as a supplier of engine parts, please contact us for potential supply.
Below, as an example, are the Vittorazi minimum low-jet settings for their factory-modified WB carburettor; for up-to-date information, please refer to the Vittorazi User Manual and Maintenance Manual, available on their website.
Atom = 22mins out from closed.
Moster Silent/Plus = 15 mins out from closed.
Moster Plus MY25 = 12 mins out from closed.
Moster Factory R = 32 mins out from closed.
Moster Classic = 15-20 mins out from closed.
Fly Easy/Evo = 15-20 mins out from closed.
When removing the tool, do so without wiggling or applying side load to the internal blade. Doing so will damage the tool, rendering it useless and preventing it from being fixed due to the assembly process.
* MK-2 Updated version. Precision fit ground steel internal blade, anti-vibration O-ring and a screw-down clamp fixing.
Also, consider our Walbro High Jet Tuning Tool for accurate high-jet factory settings.
Walbro carburettor and images are for illustration purposes only; the actual item may differ slightly.