anyone used a carbtune on a v4?

[lizard821000]

i lined the holes up too, id be surprised if they wernt close to balenced too already when i check tbh.

[Neosophist]

i lined the holes up too, id be surprised if they wernt close to balenced too already when i check tbh.

This is also known as the drill-bit method.

It's easy enough to do, use a small drill to wedge open the butterfly slightly and adjust until the drag on the drill bit is the same on each carb, your butterflies will now be all very close.

The benefit of a balancing gauge is that it takes account of the actual cylinder vaccum, which will vary slightly among cylinders depending on condition and airflow.

It'll be nice and smooth using the drillbit method in most cases but a gauge is the quickest / easiest and most accurate.

[lizard821000]

deffo mate^^^

especially since all the airscrews are adjusted by hand, so not going to be 100% accurate or in sync with one another. looking forward to doing mine, just need to find a decent half a day with clear light to go into shed and get it done.

[lizard821000]

just bought one of those 90 degree screwdriver jobbies.....but its a pilot screw bit!? can some one explain if thats right for the butterfly adjusters too? does it need to have the bend? or can they be got at with just a long screw driver? im sure their heads are a philips!!??

[Neosophist]

just bought one of those 90 degree screwdriver jobbies.....but its a pilot screw bit!? can some one explain if thats right for the butterfly adjusters too? does it need to have the bend? or can they be got at with just a long screw driver? im sure their heads are a philips!!??

There both

You can use a philips / flat or a 7mm hex on them.

And you won't get at them with a long screwdriver you need a bend as there vertical.

The one on it sounds like it'll be ok?

Easy enough to do anyway...

connect up gauges.

Theres 3 screws.. two at the back, 1 at the front.

Cylinder 2 (front left) isn't adjustable so you move the other 3 screws to balance the gauges with cylinder number 2... changing one will affect the others slightly so you need to go around a few times.

Let the engine get a little warm before you start but if it gets so hot the fan comes on let it cool down before carrying on.

[lizard821000]

thanks man, was thinking maybe i bought the wrong tool for a min.

[krisztian_andre]

just bought one of those 90 degree screwdriver jobbies.....but its a pilot screw bit!? can some one explain if thats right for the butterfly adjusters too? does it need to have the bend? or can they be got at with just a long screw driver? im sure their heads are a philips!!??

There both

You can use a philips / flat or a 7mm hex on them.

And you won't get at them with a long screwdriver you need a bend as there vertical.

The one on it sounds like it'll be ok?

Easy enough to do anyway...

connect up gauges.

Theres 3 screws.. two at the back, 1 at the front.

Cylinder 2 (front left) isn't adjustable so you move the other 3 screws to balance the gauges with cylinder number 2... changing one will affect the others slightly so you need to go around a few times.

Let the engine get a little warm before you start but if it gets so hot the fan comes on let it cool down before carrying on.

On inline fours there are 3 screws. First you balance the left or right pair of carbs and then you balance the the two pairs.
On the v4 you balance the front pair and then...?

[Neosophist]

just bought one of those 90 degree screwdriver jobbies.....but its a pilot screw bit!? can some one explain if thats right for the butterfly adjusters too? does it need to have the bend? or can they be got at with just a long screw driver? im sure their heads are a philips!!??

There both

You can use a philips / flat or a 7mm hex on them.

And you won't get at them with a long screwdriver you need a bend as there vertical.

The one on it sounds like it'll be ok?

Easy enough to do anyway...

connect up gauges.

Theres 3 screws.. two at the back, 1 at the front.

Cylinder 2 (front left) isn't adjustable so you move the other 3 screws to balance the gauges with cylinder number 2... changing one will affect the others slightly so you need to go around a few times.

Let the engine get a little warm before you start but if it gets so hot the fan comes on let it cool down before carrying on.

On inline fours there are 3 screws. First you balance the left or right pair of carbs and then you balance the the two pairs.
On the v4 you balance the front pair and then...?

You don't balance any pairs.

It's easier to think of them as all independant.

There are still 3 screws but carb #2 (Front left) isn't adjustable. You simply adjust the other 3 carbs to match this one.

Obviously as you change one carb it will affect the others so you might have to re-adjust a few times.

I balanced my 30 last weekend after changing all the shims (literally all 16) and it took about 3 minutes.

what I do it look at the vaccum level for carb 2 (the fixed one) and then adjust the one thats most out of sync first, and go around adjusting all 3 until they are level with number 2 :)

[lizard821000]

still havnt done mine, she really dosnt sound like she needs it either tbh......but i will hook it up at some point and see just how far out my guess is....lol

[GFRacingUK]

im just about to do my 35 in the next week, just cleaning the carbs at the mo, bought the carbtune last year and not used it yet.