Airbox to get to vacuum point

Need advice on which oil to use or which tyre best suits you? Share your topic and get help here.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Airbox to get to vacuum point

Post by bingo808 »

Hi
Is there a way to access the front carby vacuum point to balance the carbs without removing the airbox? Or should I remove it to get to the vacuum port?
Someone put it together, so I should be able to pull it apart.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

I've just removed the airbox and can see the vacuum screw.

Is it an allen key job or something else? If I can't get to it I'll just balance the carbs by sound. Any thoughts on that approach?
Someone put it together, so I should be able to pull it apart.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

Is this what I'm trying to remove?

Image

Won't budge using a flexible extension on 4mm allen key head.
Someone put it together, so I should be able to pull it apart.
User avatar
MacV2
Posts: 17418
Joined: Sun Jan 21, 2007 12:07 pm
Location: Grain

Re: Airbox to get to vacuum point

Post by MacV2 »

Soak it in Plus Gas & try again...

Done a few from the side without removing air box, fiddly but doable...

It's probably just seized.
Making up since 2007, sometimes it's true...Honest...
User avatar
mjvw
Posts: 223
Joined: Thu Oct 22, 2020 9:29 pm
Location: North East

Re: Airbox to get to vacuum point

Post by mjvw »

http://vtr1000.org/phpBB3/viewtopic.php ... d2#p455678

I managed to remove mine using a quarter inc drive and one of them 360 type socket heads was a little tight only small turns to remove but was completed without removing airbox, fitted brass take off attached vac pipe then blanked off in under seat, so no hassle doing carb balancing.
I did use pentrating spray and the engine was still warm.
Storming About :thumbup:
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

Well, I managed to get that grub screw out.

Is there any trick to screwing in the M5 barb/brass take off? I need smaller fingers!

There is a clamp head getting in the way. May need to move that first.
Someone put it together, so I should be able to pull it apart.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

FINALLY got the brass tap screw into the thread. I used a small length of vacuum hose to hold the tap and twist it in.

Honda part used below.

Image
Someone put it together, so I should be able to pull it apart.
User avatar
mjvw
Posts: 223
Joined: Thu Oct 22, 2020 9:29 pm
Location: North East

Re: Airbox to get to vacuum point

Post by mjvw »

Great news, make sure you put a strong clip at adaptor/hose if your leaving it permently fixed,when i did mine first time its slipped off and bike started running rough so but a really strong clip on pipe.
Once its all fitted its great just doing carb balancing without having to mess around. :thumbup:
Storming About :thumbup:
User avatar
sirch345
Site Admin
Posts: 21669
Joined: Mon Aug 25, 2003 10:35 pm
Location: The West Country.

Re: Airbox to get to vacuum point

Post by sirch345 »

bingo808 wrote: Fri Oct 29, 2021 2:50 am FINALLY got the brass tap screw into the thread. I used a small length of vacuum hose to hold the tap and twist it in.

Honda part used below.

Image
Well done :clap:

Chris.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

Hooked my vacuum gauges up and started the bike.

The gauge needles fluctuate wildly at idle. Do I need to open the throttle to smooth things out?

If so, I might need a helping hand from a mate.

Image

EDIT: What I'm missing is a valve to act as a dampening tool. See pic below.

The grey parts are the dampeners. Will fit and try again.

Image
Someone put it together, so I should be able to pull it apart.
User avatar
mjvw
Posts: 223
Joined: Thu Oct 22, 2020 9:29 pm
Location: North East

Re: Airbox to get to vacuum point

Post by mjvw »

The dampers should help. My set up uses carbtune carb sync unit I have put link to PDF further down damping is discussed.
Storming About :thumbup:
User avatar
8541Hawk
Posts: 2066
Joined: Sat Jul 21, 2012 5:21 am
Location: Bella Vista, AR

Re: Airbox to get to vacuum point

Post by 8541Hawk »

bingo808 wrote: Sat Oct 30, 2021 1:04 am
Image

EDIT: What I'm missing is a valve to act as a dampening tool. See pic below.

The grey parts are the dampeners. Will fit and try again.

Image
Instead of buying a valve, what I do with my sync gauge is run a set of pilot jets in the lines. The size isn't critical, I run whatever I have around. I believe I have 38s in there right now :thumbup:
Loud pipes don't save lives, knowing how to ride your bike will save your life.
User avatar
bingo808
Posts: 83
Joined: Sun Jul 04, 2021 12:01 am

Re: Airbox to get to vacuum point

Post by bingo808 »

Thanks for your replies guys.

Well, I added the damping valves, and I think I've busted one gauge as it doesn't read zero with no vacuum.

Image

That'll teach me! No problem, I will source another gauge and refit. You live, you learn.

Stay tuned!
Someone put it together, so I should be able to pull it apart.
User avatar
lloydie
Posts: 20920
Joined: Mon Jan 17, 2011 11:16 pm
Location: In the garage somewhere in Coventry

Re: Airbox to get to vacuum point

Post by lloydie »

Just use one . Takes a little longer but will work
User avatar
mjvw
Posts: 223
Joined: Thu Oct 22, 2020 9:29 pm
Location: North East

Re: Airbox to get to vacuum point

Post by mjvw »

8541Hawk wrote: Sat Oct 30, 2021 2:34 pm
bingo808 wrote: Sat Oct 30, 2021 1:04 am
Image

EDIT: What I'm missing is a valve to act as a dampening tool. See pic below.

The grey parts are the dampeners. Will fit and try again.

Image
Instead of buying a valve, what I do with my sync gauge is run a set of pilot jets in the lines. The size isn't critical, I run whatever I have around. I believe I have 38s in there right now :thumbup:
Love that tip :thumbup: :thumbup: What could idea. :Bike:
Storming About :thumbup:
Post Reply