VM22 Mikuni jetting and tuning basics

[@nathanbostic7039]

Bro!! Even when you know how to work on these, sometimes you run into an issue that you just can’t figure out. The next step is to listen to others. You saying the words “vacuum leak” made me look past the carb and realize that the gasket was ripped apart and sucked into the intake. I was over here doing everything I could to tune the carb. I noticed when the mini bike would go full throttle on choke. Thanks for the video!

[@dirty7739]

Yeah a lot of people make that mistake I've done it too

[@dexwatkins1745]

Valve cover gasket was ripped on mine. Ripped from header pipe bracket made a tear. Spent hours on installing new carb, jets, other gaskets. Finally got it going now going to try tuning.

[@RejectReality97]

Tards 😂 gaskets are the thing you check BEFORE you check the first thing

[@nathanbostic7039]

@@RejectReality97 never heard anyone recommend gaskets as the first step.

[@RejectReality97]

@@nathanbostic7039 The first step to diagnosing a bad running engine with a carb is always to soak the gaskets in carb cleaner or brake clean and see if it revs up or bogs down. If it does, that's a gasket leak.

[@Typhon888]

Wow!!! I did everything right. Then I seen your video and I didn’t line the carb with the manifold off. Thank you so much for that. Im just getting back into mini bikes after 2 years and got mine up and running with this Amazon carb.

[@seanbozek8086]

Thanks man this has been the most useful info I’ve found out of the 15 or so that I’ve watched!

[@dirty7739]

Your welcome

[@user-go4jb2ed5u]

Just slapped a 115 main on my 224. Haven’t messed with the pilot. Runs and revs great

[@kevingoon2747]

What stage are you in

[@rickhudson6743]

Thank you for spending the time and effort to share the details.

[@nickcanova1003]

Just getting into these clone engines , currently have a predetor ghost for my sons go kart . I have a ton of experience building and tuning 2 strokes and seems a lot of the info is the same . I have noticed the trend of running short open header pipes and these silly vm carbs , out of curiosity I want to try using modern 4 stroke mx design on these as well as different carb types like a flat slide or a pj . Also I remember having a carb on my HD that hat a 3rd jet for high ram wot maybe that could be used or the basics of it implemented on one of these . Definitely fun little engines to tinker with .

[@amirlincoln7183]

Perfect video thank you bro 😎

[@steveneng2787]

Great video super helpful. You said you're filming with a phone just tap on the screen where you want it to focus. Great video

[@lordion33]

If u hold up a piece of paper or cardboard as a background while trying to show something, the cam will hold the focus u want.

[@calebnoonan9600]

This helped me so much thank ya for this video

[@dirty7739]

No problem

[@ajmontgomery4564]

Try using the correct size screwdriver to get the jet out, idle to 1/4 throttle is controlled by the pilot, anything after is main, pilot flows constant after 1/4 throttle

[@larryfisher]

Great explanation your only one says look at plug,,n full throttle let off popping to lean of main🔥🔥🔥✌️

[@dirty7739]

Hands on research lol

[@layneaube6074]

Any ideas got chikuna carb kit for my mini bike installed and thing pissing gas out the overflow on the bottom, also seems like choke is reverered on these carbs or sum,

[@jojojeep1]

Your Parts carburetor is a real Mikuni, you notice the slide is much larger, All Chinese made Mikuni carburetors have the small bodied carburetor, even if it says Mikuni. Example the one on your bike is Chinese and it can’t say Makoni because I have one. Anyway your camera is fine you’re just too close to it ha ha ha

[@curtissmartin6322]

That's not a real real has the main jet in the bowel. Look it up

[@SNELLERIZED]

You have that backwards on tuning the idle air screw. Backing it out leans out the idle circuit. It's an air screw.

[@dirty7739]

Got ya

[@Deucealive75]

He has it correct in the video. When the screw is on the intake side of the carb, it's an air screw. When on the manifold side, it's a fuel screw. On these carbs it's a fuel screw. Same thing on the stock carb. On the stock carb the screw is after the pilot jet in the circuit. It's a fuel screw.

[@Try_hard509]

My pilot jet is a x36 and it just won’t idle at all unless with the bottom screw 4 full turns out do I need to change my pilot to a x20

[@Cereal_Killr]

Underneath your needle you don't have the lil plastic shim? You should...keeps needle from bouncing....tiny white plastic washer

[@rachalhollier5679]

1977 Yamaha DT175 enduro came with a mikuni vm24 series carburetors from the factory. I know cause I have one on my non hemi ducar 212cc,& a spare parts carb,vm24.

[@jayvlog9841]

when i full up and start is run quiek fix how to i have same carburator

[@chuckhuff7123]

Another video for this and another video for that, how about making videos in a series than release them😮.

[@THEOLYMPIAGUY360]

In my personal opinion if your turning 2 out your carbs to small especially if you plan on future modifications. You can keep jetting up but then air flow is bottlenecked from smaller carb body. Just my opinion

[@biggluke420]

Hay can you give me the link for that temp senser please and thank you

[@domturiace670]

I just installed one and i am getting a lot of kickback when starting and a little white smoke .

[@MiniMotoBuildz]

I hooked a pulse pump to it because it wasn't getting gas at all, but now it dumps gas out the overflow now when I ride it, what dose that mean?

[@SpAcEcruizer203]

hey gota stock carb on my ducar but it has the high flow air adapter so i can only run the 62mm filter right?

[@dirty7739]

Yes

[@SpAcEcruizer203]

@@dirty7739 1MONTH LATER THAT STOCK CARB SHYT THE BED TIME FOR MY FIRST VM22 LOL I GOT THE 120 HARD TO FIND PILOT JET AND A BAG OF MARKED MAIN JETS AND YES IT WAS ON THERE SO TIGHT BRO I THOUGHT I WAS GONNA BREK IT TRYING TO UNSCREW IT BRASS CHIP SHAVINGS ALL OVER DEF WORK ON THESE IN HIGH VISIBLE LIGHT LIL SHAVINGS COME OFF AND GET ALL UP IN THE PORTS EASY

[@SpAcEcruizer203]

@@dirty7739 YEA MY SHIT WAS POPIN THATS WHY MY PLUG WAS SO BLACK TOO RICH

[@gerardr4869]

Great work! What pilot and main jets do you think should go on a mikuni replica put on a Apollo 125cc dirt bike?

[@dirty7739]

It depends on where you're at and your elevation the higher elevation the smaller the main you're gonna run

[@gerardr4869]

@@dirty7739 I am at 3600 ft. The mikuni I bought didn’t have numbers on the jets. The bike would idle good but will die at 1/8 throttle, it didn’t make much of a difference if I moved the fuel screw from 0-4 turn out neither moving the C-clip up or down on the needle.

[@dirty7739]

@@gerardr4869 Probably start off with a 120 to a 125 main

[@gerardr4869]

@@dirty7739 thanks. I’ll give it a try.

[@LuisTorres-tm2jc]

Hey dirty I think pilot jets u got off Amazon fits my carb do u know the dimensions of it also do u have a link for those pilot jets u got from Amazon Also looking forward on ur 224 predator build video I picked one up on Father’s Day with a 25% coupon want to mod it as well thx

[@warrenpeas]

did you ever find these pilot jets on amazon or anywhere else cheaper? I have tried 2 different ones before finding your video both didnt fit.

[@boof6986]

Mine does nothing but leak gas out of the over flow and then shuts off when you hit the throttle can you tell me what that means

[@sandmhoder]

Do a video on the head temperature sensor please there’s like not one video on KZbin about it

[@MoHunnidzGunCollections]

I got a stock non hemi predator with governor removed and my bike has a 115 main jet stock pilot jet it bogs out full throttle

[@dirty7739]

You're gonna need better Springs and a bigger jet.

[@MoHunnidzGunCollections]

@@dirty7739 do i necessary need that ?

[@RexerYTRexer]

I have a question Why do you doubt someone would be riding up in the mountains haha.

[@rickwhitfield7617]

Good video bud! Curious if you had to run a pulse pump on that VM22 vs just gravity fed?

[@dirty7739]

Just Gravity feed.

[@scoopsf]

I have this same carb on my predator 212 stock with only a governor delete. No matter how much I tune it , it always idles high and if I don't place my go kart on stands it'll take off on me. Can u suggest any ideas on what it might be ?

[@dirty7739]

Make sure your slide is closing all the way

[@shaadow1le523]

Just picked up my vm22mm carb , what jet size do you recommend for running ethanol.. thanks in advance! Great video

[@dirty7739]

Ethanol is generally double the size of a regular jet so if you're running A120 guess you'd be like at 240 for mathenal.

[@jasonniles9938]

Where can you find jets for these at that size?

[@carlosfraga513]

I just installed a Mikuni on my minibike. 22mm I got it running took the governor out of my 212 tillotson but now, when I started it idles way too high!

[@dirty7739]

Check your idle screw and physically look in the carburetor make sure the slide is going all the way to the bottom also check for vacuum leaks

[@wonderwond]

would you know the factory main jet size ? mines burning way to rich , have it on a 80cc, my plug is pretty wet and black, new engine only ran like 15 min tops

[@dirty7739]

I believe they come with a 90 from the factory

[@wonderwond]

wow u got the 200 thats the largest one they sell, stock they say is around a 150

[@lisztomaniacgirl]

pls, help me! is it okay if my VM22 only gets settled in about 5 rounds? screw head (mixture air/fuel) sticks way out of its little house/hole

[@dirty7739]

What?

[@lisztomaniacgirl]

@@dirty7739 sorry LOL i'm talking about the mixture screw

[@dirty7739]

@@lisztomaniacgirl What seems to be the problem lol

[@nollidelddik]

I always thought the poping was from to much fuel and it popped from burning off in the exhaust???

[@dirty7739]

Nope its lean

[@nollidelddik]

Learn something new every day

[@alexgarvey6448]

You wanna take the washer off the plug w that temp sensor

[@johndeesfpv9289]

do you know what temp range these engines should run ?

[@dirty7739]

Ngk BPR5S is what i use its a hot plug

[@johndeesfpv9289]

@@dirty7739 I meant what Eng. temps should run. is there a safe or optimal range ?

[@dirty7739]

@@johndeesfpv9289 ARC says 400 max

[@johndeesfpv9289]

@@dirty7739 okay cool thank you

[@SpAcEcruizer203]

cant get mine to run witout the choke on i put a 115 main jet and they gave me the wrong pilot its the short one it wont fit

[@dirty7739]

115 sounds a little small I generally you want A130 depending on your elevation

[@SpAcEcruizer203]

@@dirty7739 ok ima try a 12o i picked up my bike and threw it across my yard i was so mad bro my life sucks

[@SpAcEcruizer203]

@@dirty7739 it's running like a Dream now boss how long I think I'll get out her it's been a year so far I think it will make it to summer and what's better the tilly estart or wildcat 223 I love my ducar tho it's all I know thanks for these vids man

[@dirty7739]

@@SpAcEcruizer203 All the tillison engines are made by ducar

[@l.a.m7645]

So if she doesn't start does that mean she's too lean or too rich?

[@dirty7739]

Check your spark plug if there's fuel on it you're too rich if otherwise it may be too lean

[@l.a.m7645]

@@dirty7739 took out plug it was black but not carbonized was able to wipe it clean with paper towel

[@dirty7739]

Could be too lean

[@becomingamotovlogermrgonza2300]

I have a grom cloan 125 with a 24 nibbie an I can’t get it to stop bogging from Quarter to full throttle. I have a 138 Idle Jet an I been upping the main jet thinking it was cause it wasn’t getting enough gas but my spark plug is really black . I started from a 115 an tried 120 an 125 while moving the needle clip as well . It’s still bogging . Any advice? I do have an after market Exhaust . Should I drop down to a much lower jet ? Like 100 or 110 ? Please help

[@troyholland3436]

Hey bro I’m getting super worried when I start it with the vm22 the bike will immediately take off on me I haven’t changed out any of the jets maybe it’s cuz the idle screw is too high

[@dirty7739]

The throttle cable is hanging up on the top of it check to see if your slide is closed all the way it's a very common problem

[@troyholland3436]

@@dirty7739 how would I know if it’s closed all the way?

[@dirty7739]

@@troyholland3436 You gotta take the air filter off and look inside

[@troyholland3436]

@@dirty7739 ok I’m getting super frustrated when I’m not even giving it gas it’s already at full Throddle that’s why it’s shooting off when I start it how do I fix that?

[@troyholland3436]

@@dirty7739 hey man I’m getting super pissed off and irritated ever since I did the stupid vm22 mod the bike won’t start I put everything back to stock and it will not start I’ve don’t literally everything to get it to start I’ve changed oil spark plug cleaned carb I’ve done everything and I really wanna go for a nice ride but I can’t cuz the damn thing won’t start at this point last thing I can think of is cause the linkage is messed up from me taking it apart and stuff would that make it not start ?? I’m out of options for what to do

[@tempz6962]

i cant get my main jet out

[@tempz6962]

where could i get a whole new thing the the main jet screws into?

[@dirty7739]

If it's A VM 22 car operator they're only like 50 bucks for the whole set up on Amazon

[@tempz6962]

@@dirty7739 i have the same carb but just like the video my main jet is stuck

[@SpAcEcruizer203]

he gets str8 to the meat n potatoes no brussle sprout shiiiiDT and dude i def drive into the mountains and hit dem slopes !!!!!! jk

[@claytonj9017]

ƤＲＯ𝓂Ｏ𝕤ᗰ 😚

[@randyhertzberg7549]

I don't get ANYTHING from Amazon, their descriptions SUCK, they LIE, and will say anything, to get you to click "pay now" ...and their prices aren't that great either.

[@rayjames296]

About how long do you have to run it for the spark plug to change?