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Author Topic: Airbox mod on a "unmodfied" DR 650?  (Read 337 times)

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Offline Copius

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Airbox mod on a "unmodfied" DR 650?
« on: May 28, 2018, 11:21:15 am »
Hi guys,

Just a quick question:

Would it be wise to do the air box mod (Even just removing the snorkel) on a DR that still has a standard Carb and Exhaust?

Regards!
 

Offline IanTheTooth

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Re: Airbox mod on a "unmodfied" DR 650?
« Reply #1 on: May 28, 2018, 11:38:11 am »
The induction noise will drive you crazy and you won't notice much change in engine output.
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Offline lecap

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Re: Airbox mod on a "unmodfied" DR 650?
« Reply #2 on: May 28, 2018, 02:48:07 pm »
It's worthwhile to check if your bike tends to stall on hard decel. to a stop. if it does that remove the tamper proofing from the idle mix adjustment screw nd back the screw out 1/8 of a turn. Besides that lift the main jet needle by half a clip height by inserting a 3mm washer (standard 0.5mm thick).between the needle clip and the nylon washer. make sure that teh main jet needle is fitted correctly when you assemble (sitting straight not skew on the D - shaped shelf.

If you want more power get a KTM 690
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Offline Copius

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Re: Airbox mod on a "unmodfied" DR 650?
« Reply #3 on: May 28, 2018, 03:52:02 pm »
Thanks for the feedback Jürgen & Ian.

I merely ask as every video and forum I've accessed , makes this out to be the first & most important mod.
.. And I quote : " Suzuki DR650 are known for a smouldering / restricting air box"

Hence , me asking the question as I'm not convinced its crucial.
I believe the OEM would know best, and would not touch and have not changed anything.

And No Thank You I do not want a KTM 690 or more power , Making assumptions is dangerous - again I only asked a question.....

 

Offline Dux

Re: Airbox mod on a "unmodfied" DR 650?
« Reply #4 on: May 28, 2018, 06:46:07 pm »
Thanks for the feedback Jürgen & Ian.

I merely ask as every video and forum I've accessed , makes this out to be the first & most important mod.
.. And I quote : " Suzuki DR650 are known for a smouldering / restricting air box"

Hence , me asking the question as I'm not convinced its crucial.
I believe the OEM would know best, and would not touch and have not changed anything.

And No Thank You I do not want a KTM 690 or more power , Making assumptions is dangerous - again I only asked a question.....

All of the bikes out there suffer from this , and it is due to emission laws so the bike runs lean from the factory , to get it running at the correct air/fuel ratio it will be necessary to change the main jet , needle position or needle and the air screw , with all that done the bike will run better , cooler and should to all intents and purposes be more fuel efficient seeing as the engine is running more efficiently .
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Offline Alphat

Re: Airbox mod on a "unmodfied" DR 650?
« Reply #5 on: September 11, 2018, 03:26:55 pm »
Hi guys,

Just a quick question:

Would it be wise to do the air box mod (Even just removing the snorkel) on a DR that still has a standard Carb and Exhaust?

Regards!

The single biggest improvement to the power output on my DR650 was to grind away the exhaust manifold weld seam. Before I did that the airbox mod and carb jetting made very little difference. I also matched the exhaust port in the head at the same time. See the pics below.
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Offline chopperpilot

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Re: Airbox mod on a "unmodfied" DR 650?
« Reply #6 on: September 12, 2018, 07:01:44 am »
I did all the carb and airbox mods, except the slide drill and spring cut mods.

I had a once off tapered needle fitted. Custom made by Matie Spearo.

Mains and pilot were changed, D-shelf mod, and needle height adjusted.

Did the fine tuning myself, by running it on the road, with a plug spanner in my hand, to check plug colour.

I had an aftermarket cannister on, but left the grind intact.

On gravel, accelerating, a 690 could not leave the DR behind! (traction)

My airbox mod consisted of removing the snorkel, and cutting a 50mm hole.

It really comes alive by doing the above.

If you are technical inclined, its only the cannister that cost a few $$$!
Current Bikes : KTM 990 R, Husqvarna 610 TE, KTM 500 XCW

End of an Era : Suzuki DR 650 SE.
 

Offline Alphat

Re: Airbox mod on a "unmodfied" DR 650?
« Reply #7 on: September 12, 2018, 01:36:25 pm »
I did all the carb and airbox mods, except the slide drill and spring cut mods.

I had a once off tapered needle fitted. Custom made by Matie Spearo.

Mains and pilot were changed, D-shelf mod, and needle height adjusted.

Did the fine tuning myself, by running it on the road, with a plug spanner in my hand, to check plug colour.

I had an aftermarket cannister on, but left the grind intact.

On gravel, accelerating, a 690 could not leave the DR behind! (traction)

My airbox mod consisted of removing the snorkel, and cutting a 50mm hole.

It really comes alive by doing the above.

If you are technical inclined, its only the cannister that cost a few $$$!

I also did all the same mods you mention and they did make a small difference, but is was not until I ground the exhaust header weld that it all came together. I would say 15% power increase after the removal of the weld. However I had already done all the other mods first. Also, the header weld bead on my bike was ridiculously big. I wish I had a photo but it must have been close to 5mm, resulting in close to 10mm reduction in overall diameter!

IMHO the mods you mention are really worth it, especially up here on the reef where the stock bike lacks poke.
Ride, Crash, Fix, Repeat
 

Offline chopperpilot

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Re: Airbox mod on a "unmodfied" DR 650?
« Reply #8 on: September 12, 2018, 01:42:21 pm »
I did all the carb and airbox mods, except the slide drill and spring cut mods.

I had a once off tapered needle fitted. Custom made by Matie Spearo.

Mains and pilot were changed, D-shelf mod, and needle height adjusted.

Did the fine tuning myself, by running it on the road, with a plug spanner in my hand, to check plug colour.

I had an aftermarket cannister on, but left the grind intact.

On gravel, accelerating, a 690 could not leave the DR behind! (traction)

My airbox mod consisted of removing the snorkel, and cutting a 50mm hole.

It really comes alive by doing the above.

If you are technical inclined, its only the cannister that cost a few $$$!

I also did all the same mods you mention and they did make a small difference, but is was not until I ground the exhaust header weld that it all came together. I would say 15% power increase after the removal of the weld. However I had already done all the other mods first. Also, the header weld bead on my bike was ridiculously big. I wish I had a photo but it must have been close to 5mm, resulting in close to 10mm reduction in overall diameter!

IMHO the mods you mention are really worth it, especially up here on the reef where the stock bike lacks poke.

 :thumleft: :thumleft:
Current Bikes : KTM 990 R, Husqvarna 610 TE, KTM 500 XCW

End of an Era : Suzuki DR 650 SE.