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Old 05-27-2015, 04:51 PM   #1
jayj93pgt OP
Joined: Sep 2013
Location: Suburbia Oregon
Oddometer: 58
Another DR650 surging post

I have a 05 dr650 with 1,500 miles now. It seems to surge a lot when I have just enough throttle to maintain speed, it doesn't seem to do it on the freeway but mostly at speeds under 55mph. I am basically at sea level in elevation. According to my smartphone-ometer I am at 45 meters above sea level.

The carb is completely stock

I am not quite sure where to start with questions but here goes nothing.

With this air filter, do I need to up my jets from stock sizes to something else (if so, any recommendation?)

Should I do the needle shim? (if so, how do I know how many washers to use)

Snorkel removal, yay or nay?

Anything else I can do that has proven results?

I would rather not hack my air box into swiss cheese, and I don't plan to put a pipe on it.

Also, how can I be sure whether my bike is running rich, or lean? is it just something you can tell after years of working on them? I've ridden street bikes for 3 years now, this is a new venture so any help is good.

All I am really trying to accomplish is to eliminate as much of the surging issue as possible, I do not care to increase the volume of my exhaust sound, or decrease my mpg. This bike is not my fast bike.
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Old 05-28-2015, 12:03 AM   #2
The Spoad Warrior
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Joined: Jan 2006
Location: Ridgefield, WA
Oddometer: 2,716

in short, richer up your fuel screw adjustment. will make less lean. should be all you require. leave the snorkel if you're not going to richen it up any further
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Old 05-28-2015, 01:39 AM   #3
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Joined: Feb 2009
Location: Queenstown , NZ
Oddometer: 375
Yep, she is running a bit lean bro.

You need to wind out your pilot screw a bit, probably about 1/4 turn.

If you or the previous owner, if any, have not played with the settings, there will be a brass plug that you need to remove to access the pilot screw.

If the surging is about the half throttle area, shim the needle up a bit.

There is a shit load of info about this, DR s are lean from the factory, on this site and dr
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Old 05-28-2015, 10:28 AM   #4
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Joined: Mar 2008
Location: Beaverton, OR
Oddometer: 1,367
Agree with these guys

Do not do anything to the air box unless you re-jet. They are quite lean from the factory.
For those that fight for it, freedom has a flavor the protected will never know.
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Old 05-28-2015, 11:20 AM   #5
jayj93pgt OP
Joined: Sep 2013
Location: Suburbia Oregon
Oddometer: 58
alright, thanks everyone. I know there is a ton of posts and info regarding this but I didn't feel like I was getting what I was looking for. I will install the extended screw today and see if I can dial in a little more fuel to fix the problem.
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Old 05-28-2015, 12:56 PM   #6
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Joined: May 2002
Location: Fort Collins, Colorado
Oddometer: 19,283
Adjustable non us needle + pilot jet fuel screw cleans it up nicely
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