DR650 Carb Swap (Pt. 6) - Improving Poor MPG
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- Опубліковано 7 лют 2025
- Finally fixed my poor fuel economy. Replaced some worn/incorrect sized parts with some new appropriate sized parts.
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Thank you! Best info I've come across regarding this carburetor. Help me out a lot
I just learned that screwdriver and wrench trick about a month ago on a yt tool channel and i have tried it and it works great, not that you ever need to do it very often. Bike looks great.
Tip: instead of your screwdriver cheat, most autozone or oreiley's sell *mini ratchets that take 1/4 bit drivers* (instead of 1/4 sockets). Combo that with a metric allen bit set + JIS driver bits. You will be amazed how much better using proper JIS bits works for those JP style "+" bolts. Which the little driver, you can push a lot of holding force with one hand and easily pop screws loose with the handle's torque. Much better than trying will all your might on a screwdriver.
In an extra tight space where the ratchet can't fit, you can use the bits with a wrench instead, and you can even use a screwdriver to pry holding force onto the end of the bit.
JIS bits can be surprisingly hard to find in town, despite the obvious fact that most JP bikes use them all over! They sell JP bikes but not the basic tools to even remove the plastics properly?!?
*I got JIS #1 #2 #3 sets from Procycle and a longer **#3JIS** from jetsRUS or amazon (don't remember). It's very handy for taking off plastics.*
I'd recommend getting all 3: the most used are
#2 is the main size for things like carb bowls
#3 is for plastics and large external attachments
but #1jis for dealing with tiny screws, like _locktighted_ carb slide screws etc (exactly where you would hate to accidentally strip a screwhead by using Philips instead of JIS)
Final trail tips:
if you don't have one of those nice mini-bit driver ratchets, you can clamp a needle nose vicegrip to a screwdriver.
For larger things, you can take just the few sockets you need and grind/sand flats onto the sockets, so you can use the same wrenches as your bike already requires. A 1/2 ratchet is nice, but rather heavy & bulky to take for most of my riding. I'd only bring tools like that for longer trips or events (with a base camp to leave things at).
I had no idea what a JIS bit was until I owned a DR650. Great suggestion.
Great vid. Thanks for showing us your progress. 42mpg still sounds pretty rich to me. A properly tuned DR should be somewhere in the 47-55mpg range. I wonder if you should raise the clip / lower the needle. Also, do you have the correct accelerator pump? If it came off a Harley, you’ll want to swap. All of that is said with the caveat that I’m far from expert in these matters. Thanks again!
Thanks. I swapped out the Acc pump nozzle in part 5 video. I think I’m going to drop to the 145 main when I get some time and then try to tune the needle position a bit more.
@@DustinRogersinMO again, for reference, I installed a TM40 set up by Procycle and got 48mpg right out of the gate. That’s on mixed-surface riding and flogging it a bit, plenty of wheelies and lots of time in 1st gear.
@@RGB872 What is your setup? Main jet? Pilot Jet? ACC nozzle? Needle clip position? Stock or aftermarket exhaust? Cut airbox? What air filter?
@@treyoliver8911 Procycle set mine up as: 145 main, 22.5 pilot, needle 2nd groove from the top. I have since moved the needle clip up one to the top groove with good results. I don’t know about the accelerator pump-it’s just whichever one they use (Procycle has posted this info somewhere). Stock exhaust, fully cut airbox, DT1 filter with Bel Ray gooey filter oil. I live at sea level. I only have about 2,500 miles on the TM40 and so far I am not back to my prior mileage with the BST, running about 46-49mpg so far.