Carb Confusion

[8541Hawk]

Rebuilt this afternoon, set front at 1 1/2 , rear at 1 3/4, runs nicely, tickover quite steady, revs well with no stutter and returns to idle well.
Went for a quick 30 mile test run (8 miles of motorway ) pulled well, definite improvement
So the washer removal in the front needle seemed to work (thanks Hawk)
So will be fine tuning next. (but not this side of xmas)

My next mini issue is filling one of the venture holes with epoxy resin.
Both my velo stacks are tall, so should I fill both front and back carbs (one hole in each) ??
Or is the velo stack hieight irrelevant to this issue

If you are running 2 long stock stacks there is no need to plug any of the lift holes.
It is done on the short stock stack and the aftermarket stacks, at least when I do the set up. You can try it out with the long stacks but I personally haven't, as it is done to correct a rich spot which I didn't see with the long stacks.

[8541Hawk]

Also to give you a little more info.
On my bike, when the airbox was stock but with the stock staggered stacks my pilot setting with 48s was right around 2 turns out rear and 1 7\8 front.

So you might want to try opening the front pilot 1\8 of a turn to see if that smooths things out a little bit.

[kev64]

Thanks for the info,very helpful, sorry to be a pain, got another question,

why is the pilot jets same front and back but the mixture screw settings are different,
also why are the main jets different sizes front to back?

[MacV2]

Thanks for the info,very helpful, sorry to be a pain, got another question,

why is the pilot jets same front and back but the mixture screw settings are different,
also why are the main jets different sizes front to back?

More fuel into the rear helps it run cooler.

[Steve97]

Then the rear pilot jet should be bigger like the others ?
and its water cooled ?

[lloydie]

Thanks for the info,very helpful, sorry to be a pain, got another question,

why is the pilot jets same front and back but the mixture screw settings are different,
also why are the main jets different sizes front to back?

And the emulsion tube are different too from front to rear

[8541Hawk]

Yes both cylinders are water cooled..... now go look at your bike.

The front cylinder is also hanging out in he wind, while the rear cylinder is blocked off for pretty much all air flow.

Which causes the front cylinder to run cooler than the rear.

This is why you set up the rear to run a touch richer than the front.

[VTRDark]

why is the pilot jets same front and back but the mixture screw settings are different,
also why are the main jets different sizes front to back?

And the emulsion tube are different too from front to rear

And needle lengths.



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