Removed the secondaries today

I've got tuneboy and opened the secondies in all gears, do I need to adjust the timing ?

Keiff said:

I've got tuneboy and opened the secondies in all gears, do I need to adjust the timing ?

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various tuneboy programmes do vary the timing, but dont worry about it if the tune your using is working well.

hogweed said:

could someone please tell me what the secondries are?and whats involved with removing them and for what gain?cheers :? :shock:

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Under the bearclaw lie the 3 throttle bodies. If you have junked the airbox & fitted triple filters, or plan to, you will have( or are going to) opened these throttle bodies & seen the butterfly valves just inside.

There are 2 sets of valves in there, the 2ndries are the first ones you get to, & are held in place with a couple of little brass screws ( easily removable). The real throttle valves lie under the 2ndries & are to be left alone. Its kinda obvious once you've actually seen them.
The function of these 2ndries is to RESTRICT the power in the first 3? gears ( cant remember if 4th is restricted). They do this by partially closing as the bike accelerates, thus limiting air flow to the cylinders..BOO! Tuneboy programmes can set their opening to 100% thus eliminating ths restriction, & physical removal of them also accomplishes this. Removal is best as even fully open they will act somewhat as a barrier.

Drag race 2 bikes one unrestricted against a restricted & you will see the free flow one smoking the other in his dust cloud :lol:

Has anyone removed the secondaries without fitting K&N filters - just replacing the existing carbuncle of a system?

perhaps the secondaries protect against a backfire blowing out the K&N'S? :?:

Mine hasn't ever backfired through the TB's.
Why would it, if its tuned right?
Had a little decible pop from the pipes
when I back off the throttle, before I got er Dynoed,
but never a backfire.

xhdskip said:

Mine hasn't ever backfired through the TB's.
Why would it, if its tuned right?
Had a little decible pop from the pipes
when I back off the throttle, before I got er Dynoed,
but never a backfire.

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Good to hear that..........I am cautious still that removing the secondaries will make the R3 a bit of a pig at slow speed in corners?Dont know really....

Gapster said:

Has anyone removed the secondaries without fitting K&N filters - just replacing the existing carbuncle of a system?

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Raask makes a sweet set of Velocity Stacks. Guaranteed to filter large birds and gravel from the air intake stream.

Gapster said:

Has anyone removed the secondaries without fitting K&N filters - just replacing the existing carbuncle of a system?

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Thats what I did. I lost a few MPG but the improved throttle response is worth it. I can get up to 100+ alot quicker now. I plan to try to time it and double check with the gps on the MPH. According to the speedo I top out at 145.