Jump to content
shoe1151

dr 650 carb question

Recommended Posts

Hi, Fellow Thumpers,

I picked up a 2007 DR 650 Mint Condition with 1100 miles on it for 3K which leaves me a lot of room to farkle and upgrade! 

Carb and air box are first on my list. I have ordered a ProCycle jet kit for the stock carb and I am going to open the air box up but stay with the stock muffler for now, my question is Pro Cycle lists in the instructions to use the 145 jet with the stock muffler, has any one tried the 150 jet with the stock muffler? if so is there any difference or should i put in the 145 and be happy?

Share this post


Link to post
Share on other sites

I used Motolab jetting on mine,Derek is a good guy and knows DR's also. I put a GSXR muffler on and took the snorkel out of the airbox lid,next I will cut the lid and put a bigger main jet in.The bike runs great with a simple jet switch.

Share this post


Link to post
Share on other sites

In stock condition the DR is Rich on top. Opening the air box makes it about right. Don't install a bigger main jet, all you'll do is use more fuel, not gain power. If it were my bike, untill I made major changes I would remove the air box snorkel, shim the needle .030", remove the cap on the idle mixture so I could set it properly, make sure the air filter is properly cleaned and oiled, add more foam to the secondary breather filter, and route it away from the air box intake. That really is the best setup with the stock carb and muffler. Plus it costs you 30 cents for a washer.

  • Like 1

Share this post


Link to post
Share on other sites
3 hours ago, troy1160 said:

I used Motolab jetting on mine,Derek is a good guy and knows DR's also. I put a GSXR muffler on and took the snorkel out of the airbox lid,next I will cut the lid and put a bigger main jet in.The bike runs great with a simple jet switch.

 

Share this post


Link to post
Share on other sites

thanks guys for the help, looks like i need to go muffler shopping before i get too carried away! any recomendations on mufflers and best place to purchase?

 

 

Share this post


Link to post
Share on other sites
22 minutes ago, shoe1151 said:

thanks guys for the help, looks like i need to go muffler shopping before i get too carried away! any recomendations on mufflers and best place to purchase?

 

 

not.  stock muffler is fine for performance

Share this post


Link to post
Share on other sites

Pro cycle or leo Vince muffler will save weight and add jetting challenge. Then that jet kit you bought comes into being useful. Others need packing and are too loud. Stock is best for most uses, especially if you want to get along with your neighbors and other trail users.

  • Like 1

Share this post


Link to post
Share on other sites

thanks for all the info, I think i will take your advice and make the simple mods firsts and see how it feels then go from there!

  • Like 2

Share this post


Link to post
Share on other sites

I did the jet upgrade on the carb to 145 jet size and opened up the air box , put in a K&N air filter, drilled the slide out, used the tapered needle from the ProCycle kit.

Wow, that really made a difference, quicker throttle response, no lagging from a stop or rolling the throttle on, more mid range, I love what it did for the bike!

Thankyou, for all the help and quick response, you guys are awesome!

 

  • Like 1

Share this post


Link to post
Share on other sites

FYI:  I've got a GSXR 350fo muffler on my DR, works great but if you've got the money buy the Pro Cycle muffler.  Overall I believe that it's the best setup and the price is in line with the other all new systems.

Share this post


Link to post
Share on other sites

Per my butt dyno, intake mods add about 70% to the performance increase, another 30% with a freer flowing exhaust. Used GSXR cans, LeoVince,  ProCycle, Staintune cans that never need repacking are great options. Other cans like FMF need repacking so maintenance is involved. I run a LeoVince because it is maintenance free, sounds just right with the long insert, weighs 7 lbs. less than the stock boat mooring and adds noticeable performance power wise and also handling wise due to less mass.

Check out MXrob's dyno charts for some info.

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Reply with:


×