Secondary Throttle Plates, who needs 'em!? - SV650.org

17-05-05, 01:05 AM

Don't know if this has been discussed here...

My SV was starting to feel a bit sluggish lately, it used to top out around 130-132 indicated. Lately, it's been showing 116-118 indicated (however, I did put on taller front tire, so this has a big influence). I switched out the 22,000 mile old air filter in favor of a K&N filter I've had sitting around forever. Top speeds are back up to 129-131 indicated. I doubt the filter makes much of a difference over a new stock filter, so don't waste your money on the K&N.

Anyways....

While I was changing out the filter, I decided to remove the secondary throttle butterflies. These butterflies are controlled by the ECU and are meant to smooth out the throttle response. Well, for some they make the throttle response worse; also, abrupt throttle changes, such as the switch from closed to open after switching gears, can be too quick for these plates and they will cause the engine to hesitate for a moment.

Removal is easy, however; I suggest you used a magnetised screwdriver with a bit sized perfectly for the screws - the metal they are made from is quite soft. The plates are located right under the air filter in the intakes, so they are very easy to get at.

You'll probably get one of two results from this. If you're not so smooth on the throttle, this will probably make it worse. If you've got good throttle control, the throttle response will be more immediate and smoother for you because there is no ECU interference.

You may want to do a TPS adjustment while you're at it.

TSM · 17-05-05, 09:28 AM

As you have done a K&N and a can change, you probably should get your bike remaped to sort out the problem.

Any other ideas, anyone?

17-05-05, 09:35 AM

Quote:

Originally Posted by TSM

As you have done a K&N and a can change, you probably should get your bike remaped to sort out the problem.

Any other ideas, anyone?

Any other ideas for what!?? Leprechaun seemed to be simply pointing out one of the mods he has done with success!?

Quote:

Originally Posted by TheLeprechaun

I switched out the 22,000 mile old air filter in favor of a K&N filter I've had sitting around forever. Top speeds are back up to 129-131 indicated. I doubt the filter makes much of a difference over a new stock filter, so don't waste your money on the K&N.

Surely the air filter should have been changed way before that as part of normal servicing!?

As for the K&N, I found that it made a noticeable difference to the bike's acceleration and I'm sure others did too... They are also cheaper than (iirc) two new OEM filters!

17-05-05, 02:25 PM

Double post, sorry about that...

17-05-05, 02:27 PM

Quote:

Originally Posted by TSM

As you have done a K&N and a can change, you probably should get your bike remaped to sort out the problem.

Any other ideas, anyone?

What problem? Did I post about a problem?

I checked my plugs after the filter swap, they are a light tan color still. I installed the filter a while back and it made no difference. In the states, many people have said that the filter makes little to no difference at all in power. Maybe you guys get different versions of the filter

Richie · 17-05-05, 06:31 PM

Quote:

Originally Posted by TheLeprechaun

Don't know if this has been discussed here...

My SV was starting to feel a bit sluggish lately, it used to top out around 130-132 indicated. Lately, it's been showing 116-118 indicated
Anyways....

Quote:

Originally Posted by TheLeprechaun

Quote:

Originally Posted by TSM

As you have done a K&N and a can change, you probably should get your bike remaped to sort out the problem.

Any other ideas, anyone?

What problem? Did I post about a problem?

I checked my plugs after the filter swap, they are a light tan color still.

Sounds like you posted a problem, then fixed it by Renewing your Air Filter which should have been replaced 14,000 miles previous...

17-05-05, 06:35 PM

Um... Maybe you're having trouble reading the thread subject. Let me put it in big letters like you did for me:

Secondary Throttle Plates - Who needs 'em!?!

I never asked about the filter, that was a preface to the actual thread topic. I never stated that I had a problem I needed advice on. I'm perfectly capable of maintaining my bike properly. At 7500 miles and 15,000 miles the air filter was still quite clean and the bike was performing like new.

This thread is about the secondary throttle plates that Suzuki put in the throttle bodies, not whether you believe I am maintaining my bike properly.

17-05-05, 07:33 PM

mmmh.. I wounder if this would work with my carbed SV, but then I'm a little unsure as to excatly has been done not have the new model SV. Would the be the same thing in them? But then my SV still gets to 130 happy even with a road can and only a 45 tooth'd rear sproket. Was doing 140ish with the original can and 46 teeth, then 130 with the race can and 46 teeth and the wife on the back. But now I have 9 points(12 means a driving ban) and 800 quid (1,469 dollars) of fines so I'll keep away from that now.

TSM · 17-05-05, 08:06 PM

Quote:

Originally Posted by Grinch

mmmh.. I wounder if this would work with my carbed SV, but then I'm a little unsure as to excatly has been done not have the new model SV. Would the be the same thing in them? But then my SV still gets to 130 happy even with a road can and only a 45 tooth'd rear sproket. Was doing 140ish with the original can and 46 teeth, then 130 with the race can and 46 teeth and the wife on the back. But now I have 9 points(12 means a driving ban) and 800 quid (1,469 dollars) of fines so I'll keep away from that now.

the curvey only have one throtle buterfly, the pointy has two, which is ment to give a smoother throtle response at low revs (the FI bikes aparently are a bit jerkey a low speed)

17-05-05, 08:10 PM

Calm down peeps.

I never used to always change the air filter at each service either. I'd check it and have one ready to go in, but if it were clean enough I would leave it till the next service.

My bike gets a service every 3 or 4 thousand miles anyway. Why waste money by changing an air filter that doesn't need changing

Anyways, secondary throttle bodies. I am assuming that the earlier models do not have such things as they don't have an ECU.

17-05-05, 01:05 AM	#1
TheLeprechaun Guest Posts: n/a	Secondary Throttle Plates, who needs 'em!? Don't know if this has been discussed here... My SV was starting to feel a bit sluggish lately, it used to top out around 130-132 indicated. Lately, it's been showing 116-118 indicated (however, I did put on taller front tire, so this has a big influence). I switched out the 22,000 mile old air filter in favor of a K&N filter I've had sitting around forever. Top speeds are back up to 129-131 indicated. I doubt the filter makes much of a difference over a new stock filter, so don't waste your money on the K&N. Anyways.... While I was changing out the filter, I decided to remove the secondary throttle butterflies. These butterflies are controlled by the ECU and are meant to smooth out the throttle response. Well, for some they make the throttle response worse; also, abrupt throttle changes, such as the switch from closed to open after switching gears, can be too quick for these plates and they will cause the engine to hesitate for a moment. Removal is easy, however; I suggest you used a magnetised screwdriver with a bit sized perfectly for the screws - the metal they are made from is quite soft. The plates are located right under the air filter in the intakes, so they are very easy to get at. You'll probably get one of two results from this. If you're not so smooth on the throttle, this will probably make it worse. If you've got good throttle control, the throttle response will be more immediate and smoother for you because there is no ECU interference. You may want to do a TPS adjustment while you're at it.

17-05-05, 09:28 AM	#2
TSM The Sick Man Mega Poster Join Date: Nov 2004 Location: Peckham.SE.LDN Posts: 4,768	As you have done a K&N and a can change, you probably should get your bike remaped to sort out the problem. Any other ideas, anyone? __________________ OTR: KTM 690 Duke R 2015 Full Akro SIDELINE: Kwak ZX636 A1P 2002, Red, R&G's, Yoshi, Double Bubble Screen GONE: Kwak ZX-7R P1, Full Akro, Undertray, Screen GONE: SV650S K2 Very Bruised & Without Fairing, Motovation Frame Sliders, R&G Ally Sprocket Toe Protector, HEL 2 Line Setup, GSXR K1 600 RWU Forks, Barnett Clutch & Springs, Penske 8981 Shock, Gilles Ti Rearsets, Steel Barends, Scottoiler, AFAM Chain & Sprockets, Twin FIAMM Horns, Skidmarx Bellypan, Full Micron Zeta Steel System, Cut down undertay. Forum Problems & Information / Site Suggestions

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17-05-05, 02:25 PM	#4
TheLeprechaun Guest Posts: n/a	Double post, sorry about that...

17-05-05, 06:35 PM	#7
TheLeprechaun Guest Posts: n/a	Um... Maybe you're having trouble reading the thread subject. Let me put it in big letters like you did for me: Secondary Throttle Plates - Who needs 'em!?! I never asked about the filter, that was a preface to the actual thread topic. I never stated that I had a problem I needed advice on. I'm perfectly capable of maintaining my bike properly. At 7500 miles and 15,000 miles the air filter was still quite clean and the bike was performing like new. This thread is about the secondary throttle plates that Suzuki put in the throttle bodies, not whether you believe I am maintaining my bike properly.

17-05-05, 07:33 PM	#8
Grinch Guest Posts: n/a	mmmh.. I wounder if this would work with my carbed SV, but then I'm a little unsure as to excatly has been done not have the new model SV. Would the be the same thing in them? But then my SV still gets to 130 happy even with a road can and only a 45 tooth'd rear sproket. Was doing 140ish with the original can and 46 teeth, then 130 with the race can and 46 teeth and the wife on the back. But now I have 9 points(12 means a driving ban) and 800 quid (1,469 dollars) of fines so I'll keep away from that now.

17-05-05, 08:10 PM	#10
Stig Guest Posts: n/a	Calm down peeps. I never used to always change the air filter at each service either. I'd check it and have one ready to go in, but if it were clean enough I would leave it till the next service. My bike gets a service every 3 or 4 thousand miles anyway. Why waste money by changing an air filter that doesn't need changing Anyways, secondary throttle bodies. I am assuming that the earlier models do not have such things as they don't have an ECU.