2006 DR650 all stock (lean on bottom end)

I just bought a 2006 Suzuki DR650 this week with 800 miles on it.

It is showroom condition, the only problem is it is lean around 1/8 - 1/4 throttle or so.

Another person replied and stated I needed to go up 1 on the pilot jet, does anyone know where I can buy one at or what size the factory is?

Also, do I need to 'unplug' the air-screw and adjust it out a bit as well?

Any help would be great, the 'lean' condition on bottom end makes it kinda hard to ride...

*Update I found this site*****

http://www.procycle.us/bikepages/dr650.html#jetkitdr650

There is a jet kit on there, has anyone used it before???

2011-05-03_DR650.jpg

Edited by ar2stroke

Putting aside everything else......I'm very familiar with this carb!

First thing is yes, you do want to remove the cap from the mix screw. 1/8 - 1/4 throttle response on this carb is usually a combo of 3 things. One, the mix screw is for sure set to lean. Two, the needle should be swapped out for a KTM LC4 needle that is adjustable unlike the one you have. You can shim yours a little but the taper is a little off too. I have one in the shop still in the OEM KTM package I'd sell dirt cheap. 3rd is the slide mod. It helps balance the pressure for that lag time. A last resort 4th option is to clip the spring. I've had to do this in other CV carbs but not this one.

CV carbs can be great when properly sized but this is a little small for a 650. Work the areas above and you can get some blood out of this turnip.

I found this when I first started playing with the BST40. The guy did an outstanding write up. Read it top to bottom. It's for the KTM version but they're near identical.

http://www.advrider.com/forums/showthread.php?t=347184

Putting aside everything else......I'm very familiar with this carb!

First thing is yes, you do want to remove the cap from the mix screw. 1/8 - 1/4 throttle response on this carb is usually a combo of 3 things. One, the mix screw is for sure set to lean. Two, the needle should be swapped out for a KTM LC4 needle that is adjustable unlike the one you have. You can shim yours a little but the taper is a little off too. I have one in the shop still in the OEM KTM package I'd sell dirt cheap. 3rd is the slide mod. It helps balance the pressure for that lag time. A last resort 4th option is to clip the spring. I've had to do this in other CV carbs but not this one.

CV carbs can be great when properly sized but this is a little small for a 650. Work the areas above and you can get some blood out of this turnip.

I found this when I first started playing with the BST40. The guy did an outstanding write up. Read it top to bottom. It's for the KTM version but they're near identical.

http://www.advrider.com/forums/showthread.php?t=347184

Thanks a million!

It is so lean stock it almost back-fires when letting off the gas and taking off is challenging...

I am looking at this link, it is GREAT!

I found this to while searching:

http://www.procycle.us/bikepages/dr650.html#jetkitdr650

Also, seen people who used the Dyno-Jet kits.

I am getting excited now, I can't wait to do the mods, almost like Christmas!:thumbsup:

Yes, buy ProCycle's jet kit and follow the detailed instructions. It's the best kit out there for the money because it includes a few extra little goodies like the stainless Allen head bolts for the bowl and the extended fuel screw. It even includes the proper size drill bits for the brass plug and for drilling the extra hole in the slide.

It's not the pilot jet you need to change... it's the main jet, and just as importantly, the needle. The kit includes a shorter, slimmer, tapered, adjustable needle that performs much better than the OEM fat needle. It's also assumed that you will cut open a fairly large hole in the top of your airbox, drill the brass plug in the bottom of the carb to expose the fuel/air screw (and replace that screw with the longer one provided in the kit), and drill an extra hole in the plastic slide for quicker response.

There's a very good thread over at ADVRider that gives lots of good info on jetting the DR's stock carb:

http://www.advrider.com/forums/showthread.php?t=635786

and you should also read this, as it contains some really good info:

http://www.procycle.us/info/questions/dr650/fuel_system.html#pc_jet_kit-1

Thanks a million!

It is so lean stock it almost back-fires when letting off the gas and taking off is challenging...

I am looking at this link, it is GREAT!

I found this to while searching:

http://www.procycle.us/bikepages/dr650.html#jetkitdr650

Also, seen people who used the Dyno-Jet kits.

I am getting excited now, I can't wait to do the mods, almost like Christmas!:thumbsup:

Don't use the Dyno Jet kit, they have a very messed up way of dealing with this issue. I have 2 of those on the shelf I took out of CV carbs. Back-firing on decel is a sure indicator that your low to mid circuit is lean. Your main may need a tweaking too but it's effect on 1/4-3/4 is very minimal.

I have not used the Pro Cycle kit but I have ordered other parts from them and they've been a solid place to order from. Last bit of advice here is that all of this is just to optimize your stock carb. There are proven power and response gains to be had by tossing it for an aftermarket unit. They are costly but if your ultimate goal is to pull everything you can out of this motor (within reason) then you might want to just start looking in to that route.

I've got a lot of pics of this carb and some parts so PM me if you need anything.

Use the DynoJet kit, just don't use their settings.

Backfiring on decel is a sure sign it's a DR650.

You could even look here for 675 posts about the DR650's BST, inc dyno charts and everything...

http://www.thumpertalk.com/forum/showthread.php?t=467615

Don't use the Dyno Jet kit, they have a very messed up way of dealing with this issue. I have 2 of those on the shelf I took out of CV carbs. Back-firing on decel is a sure indicator that your low to mid circuit is lean. Your main may need a tweaking too but it's effect on 1/4-3/4 is very minimal.

I have not used the Pro Cycle kit but I have ordered other parts from them and they've been a solid place to order from. Last bit of advice here is that all of this is just to optimize your stock carb. There are proven power and response gains to be had by tossing it for an aftermarket unit. They are costly but if your ultimate goal is to pull everything you can out of this motor (within reason) then you might want to just start looking in to that route.

I've got a lot of pics of this carb and some parts so PM me if you need anything.

I did order one from Pro-Cycle, I talked to the guy and I will give it a try.

In stock condition it is a mess, I can't see how a dealer can sell these new and watch someone ride it...

It needs to be 120 degrees to start it, and forget about it being cold!

:thumbsup:

I will hollar at ya on some other things on the bike it is ALL stock since it only had 800 miles on it, I can understand why the guy did not ride it much. He was saying how cold nature it was.

Did you trim your air-box or leave it stock and remove the door???

Any tips would be great!

Better to remove the snorkel and cut a hole in the top of the airbox.

This shows how most people cut the top...

http://www.kientech.com/DJDR650AbMod.htm

It works well, but just keep in mind the bigger the hole you cut, the more intake noise you will get (an airbox can be quite loud). But as long as you don't get carried away, the noise will be tolerable and performance will be good.

You should also be considering an exhaust system that flows a bit more air. The stock muffler is extremely restrictive. Get yourself a modified Two Brothers midpipe from Kientech, and a 2001-2003 GSXR muffler. Lots of info on this great mod if you look around. It will be the perfect compliment to rejetting the carb.

:thumbsup:

You should also be considering an exhaust system that flows a bit more air. The stock muffler is extremely restrictive. Get yourself a modified Two Brothers midpipe from Kientech, and a 2001-2003 GSXR muffler. Lots of info on this great mod if you look around. It will be the perfect compliment to rejetting the carb.

Super thanks!!!

I got the jet kit ordered today, I am not even going to try to ride it since it spits/sputters so much it is really not to much fun.

Do you know where the 2001-2003 GSXR mufflers would or links to the setup?

You are correct on the exhaust it is HUGE...

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