CHECK OUT OUR SELECTION OF PREPARED BUGEYES (AND NON-BUGEYES) FOR SALE BELOW!

How to adjust idle speed on twin SU carbs

Idle speed on an A series engine is often variable. This is partly due to the change in viscosity of the engine oil as it heats up. Your engine will idle at a lower speed when the engine is cold and the oil is thicker. Idle speed will also change when you hold down the clutch. In fact, it’s always a good idea not to sit idling with your foot on the clutch because you add stress to the thowout bearing. So idle in neutral with your foot off the clutch if possible… but regardless, it’s important all Bugeye owners know how to adjust their own idle if fine tuning is required. It’s easy to do.

Original H1 carbs have idle screws as indicated below. Later HS2 carbs have hex shaped screws as shown. Whichever type you have, it’s important to turn each screw the same amount so you don’t throw-off the synchronization of your carbs.

Look for roughly 1000 RPMs at idle. But it’s personal preference as far as what setting you like, and not all Sprite tachs are accurate. Have fun!

H1 Idle Adjust HS2 Idle Adjust

Contact us at David@bugeyeguy.com or call (203)-208-0980 during business hours