Fitting long stack

[ebenviljoen]

Hi Gents,

Got a long stack off Mac to replace my short one. Stupid question but thought ill ask, do I need to re-ballance my carbs once fitted?

Ive got a flow commander fitted and taking the airbox off to get to that stupid little screw is a nightmaire. Did buy a brass fitting when I balanced them a few months ago, but broke as I turnd it in , so only got the blanking screw in again.

[MacV2]

I didn't but it's worth having the carbs balance as it cuts down vibes if they are baldly out & generally improves the ride...

So No but do it anyway...

[ebenviljoen]

well they are balanced now, did them a month or so ago. so do I have to do it again even though they are spot on now?

as I understand the longer stack gives better torque mid range, but when you balance your carbs you do it low revs, bout 2k I balanced mine on. When I balanced them the air box was off completely and only had the stacks in. like on the tutorial that's on the forum. so if it affects mid range then they should still be balanced? or am I stupid? lol

[MacV2]

well they are balanced now, did them a month or so ago. so do I have to do it again even though they are spot on now?

I'd say no you wont as your not disturbing the carbs to fit the stack.

[tony.mon]

No, you don't need to balance them again.

[ebenviljoen]

Result!!!!!!!!!

thanks gents, was dreading doing them again lol

[8541Hawk]

When I balanced them the air box was off completely and only had the stacks in. like on the tutorial that's on the forum. so if it affects mid range then they should still be balanced? or am I stupid? lol

I have never heard of sync'ing the carbs this way and would think that when you re-installed the airbox you would change how the air is flowing around the carbs there by changing the sync.

Also I would say that yes you do need to re-sync your carbs when you change the stack. The reason for this is you have changed the air-flow characteristics which will change the partial pressure the front carb is now "seeing" which will change the sync IMHO.

[tony.mon]

Doesn't seem to work that way, Hawk. I've used both methods, and rechecked after the airbox is installed.
In both cases the carbs sense the same air pressure, sure the mixture's off but the slides will rise and fall equally once set, and they continue to stay in sync with the airbox reinstalled.
Otherwise you'd have to recalibrate the balance after fitting a new air filter, or cleaning/re-oiling it if it's a reusable type.

[VTRDark]

I have found that jet/needle/mixture and TPS changes are the worst at putting things out of sync.

(:-})