Airbox to get to vacuum point

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bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by 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.
Someone put it together, so I should be able to pull it apart.
tony.mon
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Joined: Wed Jul 25, 2007 10:46 pm
Location: Norf Kent

Re: Airbox to get to vacuum point

Post by tony.mon »

3k is fine, it steadies out by there.
It's not falling off, it's an upgrade opportunity.
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bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by 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.
Someone put it together, so I should be able to pull it apart.
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alanfjones1411
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Joined: Thu May 21, 2015 3:33 pm
Location: watford

Re: Airbox to get to vacuum point

Post by 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.
SO WHEN DOES THIS OLD ENOUGH TO KNOW BETTER KICK IN
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