RSV 04 throttle body balancing

I have just had my 04 RSV 1000 factory bike put onto map 2 as i have Alaprovic SP open cans. Dealer took under 5 minutes, so I suspect they did not balance the throttle bodies despite my request. Checked at the weekend and both the bypass screws are fully wound in. I understand what is involved in balancing the throttle bodies from the service manual but I would like to know..

1) From your experience, are there any normal settings for these screws.. eg rear out 1/4 turn, front out 1/2 turn.. that in the first instance would be better than just having them both fully would in? Has anyone got their settings after having them balanced professionally?

2) How much difference does getting these bypass screws spot on actually make? Does is significantly smooth the engine through the whole rev range or only at low revs.. i.e. useful for road riding, but irrelevant for track days?

any comments or experience much appreciated.. thanks.

It will vary between bikes and how the mechanic achieved the balance.

You start by grounding both bypass screws and then measuring the CO. Whichever cylinder is highest you bring down using the bypass screw for that cylinder until they match. On map 2 that's usually around 4 % in my experience.

The outcome is usually one bypass screw wound right in and one out a bit but which cylinder is grounded depends on which started out the highest to start with so will vary between bikes. Generally the rear cylinder is the highest but not always.

The Tb balance affects idle to 1/3 throttle.

spoonz said:

It will vary between bikes and how the mechanic achieved the balance.

You start by grounding both bypass screws and then measuring the CO. Whichever cylinder is highest you bring down using the bypass screw for that cylinder until they match. On map 2 that's usually around 4 % in my experience.

The outcome is usually one bypass screw wound right in and one out a bit but which cylinder is grounded depends on which started out the highest to start with so will vary between bikes. Generally the rear cylinder is the highest but not always.

The Tb balance affects idle to 1/3 throttle.

Click to expand...

Wot he said! :biggrin

all engines are different mate theyve all got a personality if you like ...ie theyve all been run in differently they all have different production tolerences etcetc!

a well set up will feel like a million dollars mate!

Thanks for the advice. Does opening the bypass make the mixture leaner or richer?

elbows said:

Thanks for the advice. Does opening the bypass make the mixture leaner or richer?

Click to expand...

Because both cylinders have the Tb's linked one has a direct affect on the other. Backing out the highest cylinder bypass screw will weaken that cylinder but also richen the other cylinder at the same time and vice versa.

spoonz said:

It will vary between bikes and how the mechanic achieved the balance.

You start by grounding both bypass screws and then measuring the CO. Whichever cylinder is highest you bring down using the bypass screw for that cylinder until they match. On map 2 that's usually around 4 % in my experience.

The outcome is usually one bypass screw wound right in and one out a bit but which cylinder is grounded depends on which started out the highest to start with so will vary between bikes. Generally the rear cylinder is the highest but not always.

The Tb balance affects idle to 1/3 throttle.

Click to expand...

by 'grounding' do you mean screw right in?