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Old 02-08-2011, 04:28 PM   #1
jeff_in_rc OP
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Question A question for the DR650 guys/gals

I have a buddy with one and I will be working on it shortly doing a few maintenance items. I have read somewhere that there is a carb mod that gives it better responce and I have searched until I'm crosseyed.

Can someone point me in the right direction?? TIA everyone.
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Old 02-08-2011, 05:06 PM   #2
DisTech
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Kinetech instructions.
DR650 Carb Operation (explained by eakins).
DR650 Uncork
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Old 02-08-2011, 05:10 PM   #3
NJ-Brett
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You can drill an extra hole in the slide.
That allows faster opening of the slide.
I did that mod, there is a hole in one side, I drilled a smaller hole in the other side and it helped a lot.
Too big and it might go lean as the carb was not designed to wack open at low vacuum/rpm's.

Most stock bikes are lean to start with and benefit from jetting.
There are better needles and bigger jets, but nothing comes close to the pump.
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Old 02-08-2011, 07:04 PM   #4
Wolfgang55
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The big carb mod that really helps another popular 650 is the "22 cent smile maker" for the KLR.
You didn't hear something like that, did you? Funny thing is that it also gets a 7/64" hole drilled into the bottom of the slide & then needle shiming.
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Old 02-09-2011, 02:29 AM   #5
greer
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Check out the Sticky/DR FAQ over on Thumpertalk:

http://www.thumpertalk.com/forum/forumdisplay.php?f=41

Sarah
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Old 02-09-2011, 05:16 AM   #6
gplassm
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In a nut shell: Look at the bottom of the slide, find the small hole that is offset to one side, drill another hole just like it on the other side. Shim the needle with a small washer, remove the plug and open up the fuel screw about another 1/2 turn. Done.
That will get the stock carb about as good as it is going to get, which is fine with me. The bike will start easier, respond to throttle quicker, and still offer great fuel mileage.
If you start opening up the air box, and installing a freer flowing muffler and/or head pipe, you will probably need to purchase a jet kit to get it to run well again.
JMO!
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Old 02-09-2011, 07:31 AM   #7
jeff_in_rc OP
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Thumb Thank you everyone!

Wow guys, what a responce! Thank you all very much!

I had heard something about drilling a hole in the slide now I know where to go for the info that I will pass along to the owner. I will talk to him about the problems/concerns he is having and we will go from there.

You all made my day for sure, thanks again!!!
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Old 02-09-2011, 08:00 AM   #8
eakins
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Quote:
Originally Posted by DisTech View Post
man i said alot in that post.

been happy with my setup except i've changed the fuel screw setting back in to 1 turn out. had turned out more but found over time it was causing an off idle bog. someone else posted about 1 turn and it is the best setting.

to recap my fueling setup is
-clean carb w/ pine sol soak (i was amazed how much junk came out!)
http://www.advrider.com/forums/showthread.php?t=560117
-snorkle removed from airbox (not cut open anymore)
-twin-air airfilter (quality aftermarket filter)
-ngk iridium plugs -2 (helps burn fuel better & starts easier)
-2 washer under the needle in carb slide (more/quicker fuel on the main jet)
-extra hole driled in the bottom of the slide (slide moves up faster/quicker throttle repsonse)
-replaced the fuel bowl screws w/ allen bolts plus did the throttle cable plate screws (for easier/quicker total carb removal)
-drilled out pilot jet adjustment screw plug and replace screw w/ fuel screw @ 1 turn out. you could just drill plug and turn screw to 1 turn out.
-replaced 2ndary air flter (slide filter) w/ upgraded one from procycle
-removed backfire screen (procycle says no difference but i left mine out either way)
-14 tooth countersprocket
-no jetting change


my bike came dynojetted and it ran like crap. the throttle response was very on/off and i did not like this when i needed smooth acceleration in the dirt. it also surged. i bought a used and unmolested airbox and did all the other mods. now my bikes acceleration is smooth, linear and strong, plus it works in a very wide range of elevation (10,000ft of change). i've read that CV (constant velocity) vaccum slide carbs (stock on the DR) work much better over large elevation changes vrs FCR (throttle cable directly moves the slide) carbs that people upgrade to. i've know my friends must rejet their bikes depending on where we ride, but not me. FCR does provide a better fuel hit and would think about doing that mod if i was a flat lander (but thankfully i'm not!). Stock & modified works for me, i'm happy.
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eakins screwed with this post 02-09-2011 at 08:08 AM
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Old 02-09-2011, 08:14 AM   #9
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here is the index thread
http://www.advrider.com/forums/showp...2&postcount=32
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Alaska
AZ map COBDR AZBDR IDBDR South East map
http://www.advrider.com/forums/showthread.php?t=598717
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http://www.advrider.com/forums/showthread.php?t=956350
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