Airbox to get to vacuum point

[bingo808]

Finally got another gauge to add for more accurate and easier readings.

The how-to linked above states to open up the throttle to get a more stable vacuum reading.

How many revs? 2-3000rpm? Or more?

I'm assuming that the vacuum reading goes up as revs increase? This is with the vacuum port coming after the throttle butterfly.

[tony.mon]

3k is fine, it steadies out by there.

[bingo808]

I think I have balanced the carbs - but at startup it still pops back once or twice thru the carbs from cold.

Also, I hardly get a decent vacuum reading. I adjust the damping valves but the needles change only slightly.

[alanfjones1411]

[quote=bingo808 post_id=495007 time=1636328978 user_id=15794]
I think I have balanced the carbs - but at startup it still pops back once or twice thru the carbs from cold.


Carb farts and are a normal thing with vtr's.Nothing to worry about.I just turned the idle up on mine to between 1100/1200 revs to prevent engine stalling at traffic lights etc.