It's a great feeling to own a new XR! Congratulations on your purchase and enjoy the freedom of your incredible dual sport. Glad you found the guide helpful. Take care on the road and dirt trails.
Picked up my 24 this April. Been waiting a few months to do this mod. I just did it yesterday. DeSnorkel,smog delete, 158 Main 55 pilot,shim for needle, drilled slide, shim under needle, fuel screw 2 turns out. What a huge difference in how it runs does not seem to run out of power now. Haven't checked the spark plug yet to see how it's burning but it seems very smooth.
@darrenmilliken1677 the bike doesn't seem to hold back now with these relatively simple mods. Love how the bike transforms after just a few hours in the garage. So satisfying to ride now! Glad you also had good results. I haven't checked my plug but will be doing so soon. Enjoy your new machine and the wheelies 😆
Great instructions. It's always good seeing the little steps before you tackle something. I struggled with getting that plug out of the fuel screw orifice. The old days the Welch plugs came right out Easy as they were a flat washer style plug versus a bushing insert. I'm doing another daves mod on another 650 next week. going forward I will use a hair dryer and let it expand a little. maybe it'll come out little easier . Nice video
@darrenmilliken1677 good idea with applying heat. I have never dealt with a Welch plug before so wasn't aware they used to be flatter. Good luck modding the next xr and have fun. Thanks for commenting and take care.
Update Runs fantastic. No backfire or decel popping. Pulls further in all gears, doesn't tun out of power now. Seems these things need a little more fuel for sure. Can't wait to get a good dirt tire on the back to put it to the ground.
@darrenmilliken1677 yes, same. Bike runs clean and never leaves deposits on the pipe end. Also, it doesn't backfire. I now have a few hundred miles since and have not had any issues with stalling at stop lights or running out of power. If I'm constantly racing, I get 38 mpg.. but normal spirited riding lands me at 45mpg consistently. Thanks for the update!! Enjoy the ride!
@tylerwilliams5966 Working on that video right now. Runs great with stock exhaust, uni filter, opened airbox, and 55/158 combo. Heavily debating exhaust but currently loving the sound of the air intake through the side panel. Getting about 48mpg. Thanks for watching and commenting. Have a great day. 👍
@gabrielamadeus thank you! That feeling you get when you know you broke something during a repair or mod is so bad. They make great stories 5 years down the road, but at the time, it is gut-wrenching. Definitely made my fair share of mistakes. One time, I installed an amp with the car battery plugged in. Fried the Amp. It's funny how those mistakes never leave our brains. How did you recover? Did you fix or replace it?
Wow i was under the impression this was an easy job definitely way out of my league im almost afraid to have a shop fuck it up or the jetting isn't correct and half to pay them twice to figure it out kind of a bummer seeing this detailed video.. going to sub you though
How much wrench experience do you have? I was worried about having to go in multiple times as well, but first time worked using the 55/158 combo. I want to go dyno test to see air fuel ratio, but am happy with results since she never stalls or stutters.
@XRLand im not confident or comfortable with this one i will be doing just that though 55 and 158 with full exhaust and uni and hopefully it runs like a top the first try lol going to have a shop do the work
Thank you for your compliment. You're right that I should have spent a moment to elaborate on Dave's mod. In an attempt to make the video short, I omitted what would have been useful info. I'll describe Dave's mod in the description soon. Hope your Google search was useful. Take care.
Question folks: what is the increased size of the holes in the slide accomplishing? Since this carb is vacuum actuated and the larger holes would lessen the vacuum forces on the slide, what is the change and why? Watched a bunch of XR650L mod videos and that portion isn't discussed. THX
From what I've read on the forums, it allows the needle with the diaphragm to move up and down faster for a quicker throttle response. Some also say that and the needle shim aren't necessarily needed. Main thing is to try different jets. I have and 18 that's de-smogged, de-snorkled, fmf power bomb pipes with exhaust and twin air filter. Changing the jets currently as the previous owner had 50 / 155 jets, going to try 52 / 158 and see how that goes. Have heard of some using 55 / 160 and higher. I'm only about 2000 feat above sea level too.
@ront2786 Thank you for the sub. I appreciate it. And congratulations on getting the 30th anniversary 2023! It's not necessary to rejet. The reason why this mod became popular is because the bike is restricted from the factory to pass emissions, and there is some more power to be had by opening the airbox ("desnorkling"), and installing larger jets. Some claim the bike runs a bit cooler with more fuel going in. The main benefit is a slightly more powerful bike at the expense of fuel consumption. I went from 52mpg down to 45mpg after jetting. I like the added power, so it's worth it to me. The bike tends to start easier and warm up quickly now, too. If you're happy with the power, then no need to rejet. You can purchase Keihin jets from PJ motorsports or jetsrus. Hopefully, they have them in stock. You can buy them individually. If you decide to go that route, grab a 55 pilot jet and 158 main to start. That's what I'm running at sea level with stock exhaust and larger air intake hole in side panel. Let me know what other questions you have if they come up, and take it easy.
I bought a 55/158 combo from jet r us. Do I also have to shim the needle? And if so, what is the size of that washer? I am running the bike stock, but would like it to be running a bit more rich
@@jeroom98 The needle placement dictates fuel deliver from 1/2 to 3/4 throttle (approximately). So it may lead to a lean spot while accelerating if you don't shim the needle. I installed a single 0.5mm shim. Part number JRU-8032 from jetsrus (size: 3.2mm ID x 7mm OD x 0.5mm thick). It might run fine without the shim, but most places I have read recommend it. Thanks for asking and good luck with carb work.
![How To: Dave's Mod on XR650L [5 Minutes - fixed audio w. additional tips]](http://i.ytimg.com/vi/4Aewa59FvH0/mqdefault.jpg)
this the most clear and concise explanation and steps for daves mod. thank you
I just picked up a 2024. Thanks for making this guide!
It's a great feeling to own a new XR! Congratulations on your purchase and enjoy the freedom of your incredible dual sport. Glad you found the guide helpful. Take care on the road and dirt trails.
Picked up my 24 this April. Been waiting a few months to do this mod. I just did it yesterday. DeSnorkel,smog delete, 158 Main 55 pilot,shim for needle, drilled slide, shim under needle, fuel screw 2 turns out. What a huge difference in how it runs does not seem to run out of power now. Haven't checked the spark plug yet to see how it's burning but it seems very smooth.
@darrenmilliken1677 the bike doesn't seem to hold back now with these relatively simple mods. Love how the bike transforms after just a few hours in the garage. So satisfying to ride now! Glad you also had good results. I haven't checked my plug but will be doing so soon. Enjoy your new machine and the wheelies 😆
Great instructions. It's always good seeing the little steps before you tackle something. I struggled with getting that plug out of the fuel screw orifice. The old days the Welch plugs came right out Easy as they were a flat washer style plug versus a bushing insert. I'm doing another daves mod on another 650 next week. going forward I will use a hair dryer and let it expand a little. maybe it'll come out little easier . Nice video
@darrenmilliken1677 good idea with applying heat. I have never dealt with a Welch plug before so wasn't aware they used to be flatter. Good luck modding the next xr and have fun. Thanks for commenting and take care.
I did everything on mine without drilling out the holes and it still seemed to work okay!
Update
Runs fantastic. No backfire or decel popping. Pulls further in all gears, doesn't tun out of power now. Seems these things need a little more fuel for sure. Can't wait to get a good dirt tire on the back to put it to the ground.
@darrenmilliken1677 yes, same. Bike runs clean and never leaves deposits on the pipe end. Also, it doesn't backfire. I now have a few hundred miles since and have not had any issues with stalling at stop lights or running out of power. If I'm constantly racing, I get 38 mpg.. but normal spirited riding lands me at 45mpg consistently. Thanks for the update!! Enjoy the ride!
Very well done. Thanks for
Very good video.
I have no desire to do this task.
Post a video of how it works now ! Thanks man!
@tylerwilliams5966 Working on that video right now. Runs great with stock exhaust, uni filter, opened airbox, and 55/158 combo. Heavily debating exhaust but currently loving the sound of the air intake through the side panel. Getting about 48mpg. Thanks for watching and commenting. Have a great day. 👍
Great instructions. Did the mod a few months ago and drilled the center hole. 🤦♂️
@gabrielamadeus thank you! That feeling you get when you know you broke something during a repair or mod is so bad. They make great stories 5 years down the road, but at the time, it is gut-wrenching. Definitely made my fair share of mistakes. One time, I installed an amp with the car battery plugged in. Fried the Amp. It's funny how those mistakes never leave our brains. How did you recover? Did you fix or replace it?
@@XRLand it's been running but not well, ordered a new diaphragm piston and some different jets.
Wow i was under the impression this was an easy job definitely way out of my league im almost afraid to have a shop fuck it up or the jetting isn't correct and half to pay them twice to figure it out kind of a bummer seeing this detailed video.. going to sub you though
How much wrench experience do you have? I was worried about having to go in multiple times as well, but first time worked using the 55/158 combo. I want to go dyno test to see air fuel ratio, but am happy with results since she never stalls or stutters.
@XRLand im not confident or comfortable with this one i will be doing just that though 55 and 158 with full exhaust and uni and hopefully it runs like a top the first try lol going to have a shop do the work
Very nice clear vid but needs an explanation of Daves Mod. Now i have to google it myself 😮
Thank you for your compliment. You're right that I should have spent a moment to elaborate on Dave's mod. In an attempt to make the video short, I omitted what would have been useful info. I'll describe Dave's mod in the description soon. Hope your Google search was useful. Take care.
Question folks: what is the increased size of the holes in the slide accomplishing? Since this carb is vacuum actuated and the larger holes would lessen the vacuum forces on the slide, what is the change and why? Watched a bunch of XR650L mod videos and that portion isn't discussed. THX
From what I've read on the forums, it allows the needle with the diaphragm to move up and down faster for a quicker throttle response. Some also say that and the needle shim aren't necessarily needed. Main thing is to try different jets. I have and 18 that's de-smogged, de-snorkled, fmf power bomb pipes with exhaust and twin air filter. Changing the jets currently as the previous owner had 50 / 155 jets, going to try 52 / 158 and see how that goes. Have heard of some using 55 / 160 and higher. I'm only about 2000 feat above sea level too.
I subscribed. Thanks
Question I purchased 2023 xr650l. Is it necessary to rejet carb ? If so, where did you buy the jet kit ? Thanks Ron
@ront2786
Thank you for the sub. I appreciate it. And congratulations on getting the 30th anniversary 2023! It's not necessary to rejet. The reason why this mod became popular is because the bike is restricted from the factory to pass emissions, and there is some more power to be had by opening the airbox ("desnorkling"), and installing larger jets. Some claim the bike runs a bit cooler with more fuel going in. The main benefit is a slightly more powerful bike at the expense of fuel consumption. I went from 52mpg down to 45mpg after jetting. I like the added power, so it's worth it to me. The bike tends to start easier and warm up quickly now, too. If you're happy with the power, then no need to rejet.
You can purchase Keihin jets from PJ motorsports or jetsrus. Hopefully, they have them in stock. You can buy them individually. If you decide to go that route, grab a 55 pilot jet and 158 main to start. That's what I'm running at sea level with stock exhaust and larger air intake hole in side panel. Let me know what other questions you have if they come up, and take it easy.
I bought a 55/158 combo from jet r us. Do I also have to shim the needle? And if so, what is the size of that washer? I am running the bike stock, but would like it to be running a bit more rich
@@jeroom98 The needle placement dictates fuel deliver from 1/2 to 3/4 throttle (approximately). So it may lead to a lean spot while accelerating if you don't shim the needle. I installed a single 0.5mm shim. Part number JRU-8032 from jetsrus (size: 3.2mm ID x 7mm OD x 0.5mm thick). It might run fine without the shim, but most places I have read recommend it. Thanks for asking and good luck with carb work.
I didn’t catch the thickness of the shim?
@@MrSpeed396 I'm pretty sure it is 0.5mm.