🔧 DR350S Rebuild - ep.11 Solving problem with the carburetor Mikuni BST33

Last time we finally found and bought DR350S for Marta.
This bike is actually not running and it spent last years in the garage not used.
It looks like it is in nice condition so we decided to buy it and rebuild it!
During first try of engine startup we've found out there is no fuel coming out of the carburetor to the engine. In this video we are going to check the carburetor.
All episodes:
🔧 Ep.1 Buying new motorcycle:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.2 - How to check ignition coil:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.3 - How to replace spark plug cap:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.4 - How to check power source coil:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.5 - How to check kill and ignition switch:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.6 - How to check pickup coils:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.7 - How to check neutral switch:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.8 - How to fix no spark issue + CDI replace:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.9 How to test engine compression:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.10 First attempt to start the engine and carburetor pulling out:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.11 Solving problem with the carburetor:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.12 First engine start up:
• 🔧 DR350S Rebuild - ep....
🔧 Ep.13 Stripping down the motorcycle, Rebuild START:
• Video
🔧 Ep.14 Preparing motorcycle frame for powder coating:
• 🔧 DR350S Rebuild - ep....
Next episodes about DR coming soon :)
You can also visit our website:
dmmotoadventur...
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/ dmmotoadventures
if you enjoyed please leave a like and subscribe :)
Have a nice day!
#motorcycle #rebuild #DR350

[@rangie944]

Absolutely the best explanation bar none with very clear demonstration of how the carb is operated and maintained. Superb, many thanks for taking the time to make and post this video.

[@mattiaturchi7249]

All your Dr350 videos are just awesome, for a Beta M4 (it mounts dr 350 motor) owner like me they are lifesaving. Thanks to you and your guides i can do all the maintenance to my bike much more faster, better, safer and on my own... putting hands on it is a pleasure like this. Thanks a lot, greetings from Italy :)

[@DawidMartasMotoAdventures]

Hi! Thanks :) We already know that there is the same engine in Beta ... you can swap the Beta's e-start engine to DR and enjoy e-start :D We hope there will be more and more useful videos about DR and XR :) Cheers!

[@timonstettler8403]

Literally the best video on carburetors I've seen so far.

[@DawidMartasMotoAdventures]

Thanks! :)

[@thibben7097]

Thanks! 1000 thanks for yours videos, specially this one. My DR haven't started during 7,8 years, and after rebuild my mikuni carbs, it don't start. This night I watch your video, so tomorrow at 8h when the neighbors are wake :D, I try to do what you show in this vids. Sorry for my English. Thx from France!!!

[@DawidMartasMotoAdventures]

Good luck! I hope it will start without any problems :) Thumbs up for this 8 years sleeper :D

[@David-jz5zp]

After years of cold starting problem on my dr250s. I plugged the vacuum on carb . Starts easy now cold .thankyou for your video marta

[@jonsmith3723]

I am reassembling one of these for a friend of mine and want to thank you for the excellent videos!

[@DawidMartasMotoAdventures]

Thanks! :)

[@cliffweinan3907]

Thank you for documenting an important repair. If carb not right, engine wouldn't run well. Carbs do need maintenance because of rubber age and ethanol in fuel. For a small engine that is user repairable, carbs are still the simpler way to go. Also thanks for documenting the correct main jet and pilot jet. I notice some of the carb rebuild kits have incorrect hole size in the new jets they provide. Let me add knowledge about that mystery vaccum port that you plugged. In the US, that port was plumbed to a special fuel tank valve that shut off fuel when the engine was not running, I guess some type of safety feature. Just get a new generic fuel tank valve without that feature, keep spare fuel tank valves because ethanol eventually eats nylon filters on the fuel tank valve. Like you I plugged my carb vaccum port but a few years latter my rubber plug cracked causing a vaccum leak. This leak would not be good if you are on a remote trail ! To more permanently plug that port, I carefully tapped it and put in a 8-32 x 1/2 machine screw . Don't know what the metric screw equivalent would be. I am also having good history with a lithium battery. Happy riding. !

[@DawidMartasMotoAdventures]

Thanks for the clarification on the vacuum port. We have never rechecked this rubber plug, but it seems like a good idea. Anyway the idea of threading the vacuum port and plugging it with a screw seems good :) Cheers!

[@billbright1755]

My DR 92 has 30,000 miles runs great. Vacuum operated petcock line port. Constant velocity diaphragm type carburetor. Oiled foam air cleaner. A premium iridium plug will last virtually for life.

[@DawidMartasMotoAdventures]

My DR got manual petcock, rest is the same. Can you send me type/name of this iridium spark plug? Thanks!

[@billbright1755]

Dawid&Marta's Moto Adventures NGK iridium BR8EIX. Put a bit of high temp anti seize on threads, do not cross thread, a bit of dielectric grease in boot. My faithful old DR starts on third kick. Will run all day no problems. I use premium O ring chain and chain wax for each run. I enlarged air box opening and use UNI filter. The mount screw is a bit of a pain to access so my wife Julie get the call with her small hands. I sold my 82 KE 175 to get my DR 350 in 92. Had over 10,000 miles on it ran as new. Wish I would have kept it as well. But I have 5 motor cycles. Hard to keep them all.

[@DawidMartasMotoAdventures]

Thanks for info, we will try this spark plug :) Yes, it is hard to mount air filter in airbox. We changed air filter from paper to sponge and we oil it from time to time. It is better for offroad use. Have a nice day!

[@dunemaster3179]

Thank you for this video. I also had a hard time starting my dr350 and I plugged that little hole like you did where there was vacuum leak from choke compartment and it starts a lot easier now. I used to kick it 30+ times to start it, now it starts usually 3-6 kicks. With that said, the bike is new to me, so once I figure out how to properly kick it, I could probably start it in 1 kick. I used a piece of shrink wrap to make a little cap that went over that little vacuum hose protrusion.

[@DawidMartasMotoAdventures]

Ehm ... this comment was marked as spam and hided :< That's good to hear you also solved this problem! The best way to start this bike for me: 0) Fuel on, choke on (when engine is cold), kill switch, ignition switch, neutral gear... 1) Push kickastarter until you can feel resistance. 2) Press decompressor lever, it should stay pressed. 3) Press a little kickstarter lever, decompressor lever should pop out after very little push. 4) Free kickstarter lever and let it move to the top. 5) Now it is time for strong kick. 6) If engine is not running - go to 1. You should use decompressor lever to avoid cracks in inner part of clutch cover :)

[@Primiguys]

I have the DR350SE with electric start, and lately it would not start on cold (I used starter spray). I have plugged the hole and now it starts fine. Thankyou.

[@cobramatt1]

Excellent Video! Thanks for posting.

[@RiggadonDan]

I had the same issue with the vacuum port cap missing on my carb!! Took a week to figure out why it was running so lean. Wish I had seen this earlier

[@DawidMartasMotoAdventures]

Luckily you found the answer by yourself, you can be proud! :)

[@RiggadonDan]

@@DawidMartasMotoAdventures found it in a forum, but thanks for the support :))

[@jimalessandra5908]

Great video! Very detailed and understandable. Much appreciated!

[@Monkeycbr1]

Excellent thank you. I have just picked up a dr350

[@gronno]

The part that you capped takes a M4 thread just perfect, then use a short M4 screw with a bit of loctite and problem solved for ever, the screw cannot fall out.

[@DawidMartasMotoAdventures]

Very smart, thanks! :D

[@TheManiacWorld]

That is what I have needed! Thanks!

[@DawidMartasMotoAdventures]

You are welcome :)

[@ilacha69]

Thank you a lot for this great video

[@laprepper]

the port on the choke line is vacuum for the stock vacuum petcock. Many owners go to a normal petcock and thus need to close that port. Nice video though! I have at least one bad o-ring in my carb causing all sorts of leaks and it won't start at all!

[@DawidMartasMotoAdventures]

I was thinking that DR350S has "normal petcock" as standard, but this carb is used also in other bikes - so there is vacuum port present for other bikes. Thanks for information and good luck! I hope your bike will start soon :)

[@Breezy-Leaves]

I've only seen the vacuum petcock / fuel tap on North American bikes, so I assume this was a regulation there that Europe didn't have at the time. Much safer to have the vacuum type, because if the float was stuck open and you left the fuel tap on, you just get a dangerous fuel leak on the floor or into the crankcase, or both.

[@hikdingle2210]

@@DawidMartasMotoAdventures its always on then

[@SheriffBo]

Very informative, thanks for posting it will help me when i rebuild my carb(:

[@DawidMartasMotoAdventures]

Hi! We recorded another video with full carb disassembly and rebuild (all jets, choke valve, orings, screws) ... but last time we are spending all the free time after work to assembly this bike, so there is no new videos :( But it is almost ready and we hope in upcoming weekend we will test it! :D

[@SheriffBo]

Dawid&Marta's Moto Adventures y’all are awesome! Keep up the good work

[@DawidMartasMotoAdventures]

Thanks! :) We will try to finish this show :D

[@KowboyUSA]

Mine seems to be having troubles getting fuel from the carb to engine, plus gasoline seems to be diluting my crankcase oil. Need to pull my carb and see if it has a similar problem to that one. Thanks.

[@Scott-ly3ch]

Hey great video! I have a 99 350se, the carb looks very similar but I notice some differences, mine doesn't have a drain plug

[@rickyl.9675]

I can't find a fuel mixture screw on mine. It's got this brass plug with a small hole in the center where the screw should be at on the carb

[@andrewbird9938]

Hi. I notice that there was a washer that wasn't original that you put on top of the needle, I think that it was meant to be under the needle clip which wood raise the needle. Someone must of thought it needed it this modification to improve performance

[@DawidMartasMotoAdventures]

Hi! There must be big washer at the top. Spring pushes down needle and slider, without big washer at the top needle can move up and down without slider :D

[@andrewbird9938]

@@DawidMartasMotoAdventures my mistake

[@acidus404]

Hej Marta. Czy macie jakieś części do tego gaźnika? Ułamała mi się dźwigienka ssania i nigdzie w sieci nie mogę takiej znaleźć.

[@shauncogger5248]

Hi could u please tell me the size of the diaphragm in your carb. I ordered one for a mikuni bst33 but it's to big and does not sit in the Ridge. I have the same carb as yours and same bike thank u

[@souf900]

My throttle valve is a little bit open when i connect my throttle cable, how can i fix this? When the cable is not connected the valve is closes nice

[@DawidMartasMotoAdventures]

I think you can adjust throttle cable near the carb. Throttle cable is hold by 2 nuts per one cable. Or the cable has wrong length.

[@evelcustom9864]

Hi, this is a great video. I have a 91 dr250s with that same carb. Could you tell me, if there was a small hole in the diaphragm, what would you expect to happen in the way the bike runs?

[@DawidMartasMotoAdventures]

Hi! There is no hole in diaphragm. When there is hole in diaphragm then bikes run lean - there is air leakage and diaphragm can't pull the needle to open main fuel jet ... but probably small hole make no big difference

[@johndawd4616]

Wow I love you, good video.

[@DawidMartasMotoAdventures]

Thanks! :)

[@johndawd4616]

@@DawidMartasMotoAdventures You're welcome ☺️☺️☺️🥰

[@mikerafonemusic6177]

Very cool but what position do I set the internal jet that has a spring?..I'm working on the same carb!

[@DawidMartasMotoAdventures]

As far as I remember after tightening, you should unscrew it by 1.5-2.5 turns. It is just starting point and you should adjust it.

[@TheBychu]

Hej, co może powodować powolne schodzenie z obrotów po dodaniu gazu na biegu jałowym?

[@unclequack5445]

You should have shimmed that needle up while it was out. You should have changed out all screws with SS allen head fasteners I fix bikes for a living do this every day.

[@DawidMartasMotoAdventures]

It was only temporary fix to start the bike. This carb was completely rebuilt with new parts :) But changing screws from cross head to allen head is good idea 👍

[@jonjones754]

Hi..my vaccuum stub port has a 30cm rubber hose connected to it but its open at the end..should I remove the hose and cap off the port?? Thanks Jon

[@DawidMartasMotoAdventures]

Yes, it should be closed. Anyway there is "vacuum", so it sucks dirt to the carburetor/engine. It is not good :)

[@jonjones754]

@@DawidMartasMotoAdventures excellent..thanks for your quick reply I'll look at fixing this tomorrow..I wonder why the hose was attached in the first place?? Love your videos..very clear and very informative..thankyou. jon

[@cheba4786]

🔥👍

[@themightycrfs5491]

Hi I have problem with my carb Do not think choke is working properly You say the port hole next to the choke should be blanked off I will try this But also, on the top of my carb there is another port hole that has already been blanked off Is this correct 🤔 It is a Mukuni carb on Dr 350 ( 1991 ) Is this correct Many thanks Roy

[@chomper4x4]

Did you find out the answer? Does the port/ nipple get plugged or capped thats on the very top of the BST33 carb? On a 1991 DR 350S

[@Саша-Сама-то]

hello, I’m your friend and I have the same Suzuki motorcycle, would you be wet to tell where you can buy a repair kit for this carburetor

[@DawidMartasMotoAdventures]

Hi friend! I bought this kit in Polish online motorcycle parts shop. This rebuild kit is much cheaper at aliexpress (~10$). You can find it while searching "Carburetor Carb Repair Kit For SUZUKI DR350SE"

[@Саша-Сама-то]

@@DawidMartasMotoAdventures ok thanks

[@DawidMartasMotoAdventures]

You are welcome :)

[@kikipikify]

Which carburetor repair kit do you recommend for the DR350S? Cheers

[@DawidMartasMotoAdventures]

Hi! I used "Psychic XU-07362" kit. It is for DR 350 SE 1994 - 1999, but it works fine with DR350S 1993 :D

[@kikipikify]

@@DawidMartasMotoAdventures Thank you for your help, and thank you so much for your videos!

[@DawidMartasMotoAdventures]

You are welcome :) I found out that "Psychic XU-07362" kit looks similar to www.aliexpress.com/item/33027146875.html but I'm not 100% sure. Price is much better :D

[@kikipikify]

@@DawidMartasMotoAdventures Very nice! Maybe I'll try this one :D

[@mybacer]

Doesnt that "hole" need for fuel pump?

[@DawidMartasMotoAdventures]

This is possible. Sometimes motorcycles uses vacuum operated equipment, like: fuel pump, petcock, chain oiler... . It is only vacuum port, providing vacuum. Basically in DR350 there is nothing to connect (sometimes there is only vacuum operated petcock), so in this case it should be capped. :)

[@mybacer]

@@DawidMartasMotoAdventures I ride dr750 BIG and he has same carbs like dr350 only two in a row. I have problem with cold start something like you explained in video. This hole that you are capped leads hose to fuel pump. One guy told me that thin pipe for extra fuel is clogged so it makes problem when cold start. Everything is cleand and replaced but cold start problem. Is there any more hole that i need to cap?

[@mybacer]

@@DawidMartasMotoAdventures What is the hose that you attach to another hole?

[@DawidMartasMotoAdventures]

I think it should be ok. You got one connector at the top of this black cap, but it leads to nowhere, no idea why it is there. There are 2 overflow connectors: one at the bottom of floater bowl, and one at the side of carb 6:14 There is also one vacuum port and one fuel line. And that's all. Are you sure this fuel pump is ok? Maybe you can bypass it and close both vacuum holes (two carbs)? Only make sure that tank is full of gas.

[@mybacer]

@@DawidMartasMotoAdventures thanks a lot. I will try to close all and see what is happening.

[@idahopotato5837]

Clean that carb bowl.

[@DawidMartasMotoAdventures]

It is glass blasted now :)

[@Саша-Сама-то]

?

[@everready19373]

Lose the ridiculous background music. It's annoying and distracting.

[@DawidMartasMotoAdventures]

Thanks for the tip :)