Virago250 V star 250 Carb Rejet Full Walkthrough. 6 Sigma Jet Kit Review.
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- Опубликовано: 1 янв 2023
- Complete how to for rejetting the carb on any XV250 model. For my bike with K&N air filter and drag pipes I found a 120 main and 20 idle jet worked best.
I don't recommend you buy the 6 sigma jet kit. Far too expensive for what is included. Here is what I would buy instead:
115, 120, 125 main jets -
www.jpcycles.com/product/403-...
www.jpcycles.com/product/403-...
www.jpcycles.com/product/403-...
20, 22.5 idle jets - www.jpcycles.com/product/400-...
And a basic carb rebuild kit from ebay -
www.ebay.com/itm/184978264140... 
Хобби
![Carburetor jetting trick [YOU NEED TO KNOW THIS!]](/img/1.gif)
Have to say Thank You!! I pulled my bike out this spring and it's not running well. It has always had a terrible cold idle, wanting to stumble for the first mile or two of riding. Always wanted to tear carb apart and check or change jetting. This video helps me out tremendously!! I never knew what jets sizes to even look for!! Thanks a Million!!
Man you're the best, I was looking for something like this for so much time, I've got an Intruder 250 with a MIKUNI BDS26 (same as yours)with some idling issues, and this video was super helpful, i really appreciate the content!! Thank you very much =D
I had never heard of that model of bike. Looks cool. Doesn't look like they sold them in the US. Glad the video helped!
That was the most helpfull video on xv250's i've ever watched. Thank you for your attention to detail. It is straight to every info one needs.
Thanks! I was disappointed by the lack of documentation and how to videos when I bought my XV250 and figured the community needed some useful tutorials. Making a good how to video is much harder than it seems. It's encouraging to hear that they are actually useful for xv250 owners.
The best guide I have seen so far. Thank you!
VERY nice video! I'm looking at $350 from the local bike shop. My main hesitation was removing the carburetor because of the limited space and everything connected to it. Your video showed me I can do it without taking out the carb. Thanks SO much!
Im looking forward to do this on my 2023 vstar 250, best video to take notes from and learn, thank you so very much .
Thank you very much for this very thorough and easy to understand installation video
Suoerb video. Perfect description of the work needed . Well done sir .
Thank you
Great video. Do you have the exact Amazon kit sku/item number that you show here? Thank you in advance.
How many turns out did you set your mixture screw? I’m having trouble setting mind and I just wanna ballpark it for now. Thanks!
Without checking my bike I think I currently have it at 4 or so turns out. This is at sea level with a 20 idle jet.
at 12:58 do the metal shims come with the sigma kit or can i get it with the kit you posted in the description?
They come with the 6 sigma kit. It's the cheap way to do it but entirely valid. The kit in the description comes with an adjustable needle that you move the clip up or down on as opposed to having to use shims to get the same effect
@@helloish12321 awesome thanks
19:21
Is the idle rpm in this scene about 1300-1400 rpm?
Thanks for your useful videos.
It's right about there. I didn't have my tach on me but I am used to the sound enough. Go a bit higher than my rpm just to be safe
@@helloish12321 I just watched a video of another bike has 2 cylinder engine and tachometer. Indeed, the idle rpm of your bike seems to be around 1400.
The correct RPM was much higher than I expected. Your insights into battery charging and oil pressure are excellent.
Have fun with your nice bike!
You have a nice looking helmet, what brand/model is it?
Sedici Strada 2. It's one of the cheaper graphic helmets out there but it gets lots of attention regardless. Got mine on sale with 2 visors for around $220.
On the adjustable needle that comes with the rebuild kit... Since you're not using shims, how do you recommend we set the adjustability?
You can set it side by side with your stock needle and figure out where the clip would need to be for them to have about the same effective length. Then move the clip one notch closer to the point of the needle.
That will make the needle sit higher in the body of the carb and allow more gas to flow through the main jet sooner.
@@helloish12321 ok one noch from stock got it! Thank you
Does the re jetting do the same thing as a thorough cleaning? I'm new to this.
The jets are the brass parts that gas flows through to mix with air and go into the engine. There are typically 2; a main jet and idle jet. The larger the hole in the jet the more gas goes in. The jets with bigger numbers have larger holes.
You can use this guide to help take out your factory jets to clean them but if your bike is stock (no intake or exhaust work done) then you don't need to change the sizes. If you do intake or exhaust work then you get more air in and need to adjust the jets accordingly.
@@helloish12321 ok thanks. My daughters 2013 v star 250 sat for a long time. It'll start barely but gas is flowing out air box area. I assume this is stuck float? Etc. your video is very clear thanks.
@@desotopete mine had the same issue. Stuck float or bad float height. Start with the float and make sure to clean all jets as well as the idle air mix screw. That circuit gets clogged very easy and it will never idle right
@@helloish12321 thanks a million. Your video gave very clear description and instructions about the carb. Good editing.
you mentioned you put a 125 main middle jet , but you failed to mention the jet size for the pilot jet , would you please let me know what size pilot jet that you used please, i have a 2003 v star 250 , merry christmas
There was only one idle jet in the kit in the beginning, a 20. Additionally I listed in the description my current setup. After trial and error I found a 20 idle ,120 main and 1 needle shim worked best on my bike.
Your bike may like a little more or less gas so try a few setups
@@helloish12321 ok great where can i go to get the 20 jet pilot &120 middle main jet 120 & 1 needle shim to work best on my bike , thank you for your time please forward me where i need to go to get these parts , happy new year, Trey
what web site do you recommend ???thank you again
@@treyatkins358 jp cycles typically has jets in stock. If you can't find any there then you can usually get generic jets on Amazon in a big kit. Just search xv250 jets on Amazon to find some
is it fine to use the stock idle and then 120mains or does it need to be 20 or 22
You may be able to get away with the stock of you screw the idle mixture screw way out. My bike had trouble with lean idle mix even when it was stock so I would definitely recommend a 20 jet for the extra $5-7
I used a 22.5 in mine for a test and it was WAY too rich. Can't imagine you would need anything other than 20
@@helloish12321 thank you. do you happen to know anywhere else that sells a size 20 the one on the description doesnt have it in stock
@@jesusrios9630 www.amazon.com/gp/aw/d/B07ZH43PT3?psc=1&ref=ppx_pop_mob_b_asin_title
This is what I bought since they can be a bit tricky to find and I wanted a bunch of options for other bikes if I needed in the future. They are knockoff parts but the 20 in this kit matched my other genuine 20 jet
@@helloish12321 thank you so much
Excuse my ignorance. But what is the goal or hope for installing this kit? For someone with a functioning carburetor that has no noticeable problems, is this not needed or is it recommended for performance increase.
Only recommended if you have done exhaust or intake changes. It adjusts your fuel mixture for the additional airflow. If you don't do this after a new exhaust or intake then you will have a lean mix and it causes higher temps which is a no no on these air cooled motors.
Info in this video can help with basic carb cleaning as well since I show how to access the jets and slide.
@@helloish12321Forgive my ignorance I understand needing bigger jets when the intake is modified as you get more air intake requiring more fuel, but exhaust pipes are only removing exhaust gas not affecting intake? Thanks for the great videos on a great bike.👍
@@helloish12321...I'm curious as I have just bought a 250 Vstar and got some loud pipes for it. Whenever I put loud pipes on a carby car I never changed the jets? I am interested in your thoughts. Thanks again for the great videos.👍
@@caprilover6391 I can't say for certain since I have no experience with carbureted cars. Having just switched the pipes without rejetting really upset the running condition of the motor and probably more than it does on other bikes. Yes it will start and run, but the control of the throttle won't be smooth and it will backfire a lot.
It's worth noting that this bike is also sold as a 125cc with the same mikuni carb. It might have something to do with the carb being slightly undersized for a 250 already.
@@helloish12321 Thanks for the reply and very interesting. Thanks for explaining your experience. You're the man with the hands on experience, so I'll go with your advice and rejet mine when I fit the pipes. Thanks for a great channel and community of XV250 enthusiasts, I'm subscribed. Keep up the good work my friend.👍
i relized when installing it the gas just keeps coming out any help with that
Where is the gas coming out of. The petcock?
@@helloish12321 its from the tube from the very first step
Make sure the petcock is set in regular or reserve. The handle should be pointing up or down. If it's pointed sideways it's the "prime" setting which just allows gas to come out with gravity. If it's set on regular or reserve and gas is still flowing out then you may have a faulty petcock. Either rebuild the seals inside or you could drain the tank or put a bolt in the pipe to plug it while you do the work
I have stock exhaust, the bike seems really low on power. Running on both cylinders, and i have access to the adjustment screwm but the adjustment screw on the carb seems to do nothing...
Have you cleaned the carb or done any other work to it? My stock carb gave me all sorts of trouble when I got the bike which is why its on the workbench in the video and an amazon chinese carb is on the bike. Often times you need to clean more than the jets on the carb to get it all running right depending on how the previous owner fiddled with it or let it sit.
@@helloish12321
yeah, i put carby cleaner through it, completely disassembled the carb and cleaned it out and put the air compressor there to clean out any passageways
@@qwertyui90qwertyui90 what jet sizes are in there? Should be 17.5 and 110 stock. Did you make sure to take out the idle mix screw and blast that out?
Aside from that you can check your float height.
@@helloish12321 ill check today the sizes. Yes they are clean.
@@helloish12321 it was wrong main jet. Swapped to a 110 main jet.
The idle smaller jets have no labels on them to see. No markings at all.
The bike now idles with a deep orange flame with a glass spark plug.
Gunson colortune spark plug is being used to see.
Light blue lean. Blue is okay. Orange is rich and yellow is way too rich.
is that "slide" a choke valve??
No. The slide in a cv style carburetor like ours is what actually controls the airflow to the engine, not the throttle valve. When you open the throttle plate you actually cause a pressure change in the carburator that then moves the slide up by pulling a negative pressure on that rubber diaphragm. Our bike also doesn't use a butterfly valve choke, the choke plunger controls some other pressure system that I don't entirely understand, but the end effect is more vacuum to suck more fuel through the jets.
The alternative is a slide style carb where your wrist directly controls the slide and there is no throttle butterfly valve at all. Pull the throttle and the slide goes up. These typically have a butterfly valve style choke. You see these on dirt bikes for instant throttle control.
Many street bikes use cv carbs because they are somewhat altitude adjusting. They figure street bike riders are less likely to want to constantly adjust tuning. They also add a slight smoothing effect to the throttle making the ride less choppy.
@@helloish12321 Ok, that made the most sense. much appreciated. thanks. I know for the fact that it has a throttle plate valve as oppose to this slide. Even tho, that thing does act like a choke which is why I assumed that what it is the function for it to run rich and lean. Didn't realize its a slide as a slider whatever it is but slides. Wonder why they use that than the plate. Anyways, when i had it wide open, the idle is so high... so I move it to nearly middle to the point it idle lower before it stalls out. tho the bottom line is it acts like a choke! haha
@@HighAway do you mean you were messing with the slide with the cover off while the bike was running?
@@helloish12321 No no, when the choke lever were still on the bike's bar, assembled. Was doing 'em while idling and or riding... just to see how it runs.
What is the gas mileage with the jet kit and different exhaust system? How many miles are on your motorcycle?
I like small motorcycles and want one that will last forever, even if it is kept stock. Yamaha has a good reputation for reliability. Do you think one of these would make a great motorcycle for a couple of decades of riding for perhaps 100,000 miles?
From what I understand smaller motorcycles don't last as long as large ones. Overstressed engines and all that. Also this being air cooled doesn't help.
I have almost 10k on mine with no severe issues. Only the usual 15 yo outside kept motorcycle things. I consider it very reliable so far and its an old simple design. Not a lot to go wrong.
Completely stock I got routinely 72 mpg. After the pipes and rejet it went down quite a bit to low 50s. I was running a Chinese aftermarket carb and swapped back to the OEM mikuni and once I got that completely dialed in I get high 50s.
It's a large mpg drop but the bike feels much faster afterwards.
Thank you for your information. It was helpful.
@@helloish12321