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N-Space • Pete's World "Captain Jack Harkness" was the alias adopted by Time Agent and con man Javic Piotr Thane (AUDIO: Month 25) from the 51st century. Maybe I can go over the instructions so I can make better sense of what was changed out. Since the was done, my mileage has increased but, when starting from a stoplight, there is hesitation and an occasional stalling. You will be moving more air and need to compensate with more fuel. Do you always run VP110? Explain how you get it to stumble? If you had that much fuel in the crankcase, the float became stuck open due to debris of worn float needle. I pulled off the vacuum line to the fuel valve and it was wet and had alittle bit of fuel in it. When in doubt, remove the screw and see what kind of tip it has, that will determine what it meters. This is achieved by turning the idle screw CCW. Ran amazing. Don’t those normally coincide to an extent? The bike now starts a lot easier after getting the air mixture right. Don’t use this setting other than when the carb bowls are dry to quickly fill them. The engine was smooth enough for running. Maybe the color will indicate what is going on. Used painted octanes on both sides (orange and sky blue octane) to get a “pearlescent black octane” effect. screw, and the idle screw does nothing regardless of position.. We’re at a complete loss as to what to do with it. Do the setting for them have to be the same or different. Something else is going on. Watch this video as it has a lean bog to get an idea of what it sounds like: https://youtu.be/6b9dMhgZT-c. How it sounds below:-, http://vid1277.photobucket.com/albums/y493/jgl9/yammissfire_zps2db14cb6.mp4. Engine ran fine until cracked block etc etc. I have a 2001 Yamaha f80 outboard motor. I am building a ‘97 XR70 engine with an 88cc kit, race head, 0.275” lift cam, and high-flow exhaust. Bike runs amazing if I’m flogging it. Yes, the jet needle/emulsion tubes are different. They work opposite of each other so it is important to know that before performing this procedure. Thanks again for everything. One correction to your otherwise excellent site, the Mikuni VM series carbs have both a pilot fuel screw and pilot air screw for tuning the idle circuit. This is true for most carburetors. Here is an example of a an AIR screw adjustment. ... Jack … I have been having issues with it running lean, white spark plug. Trying to escape the fallout from a wife's betrayal. When does it backfire? Wasn’t until today that I saw a coupon for 30% of any book started on the 26th and ends on the 1st. Find a different shop! I’m a female who owned a Fazer years ago and my old one never sounded or idled like this one. I have already ordered 3 of them, the one that is currently in is a size 45 (the biggest sold for this carb), and I’ve ordered a size 40, 38 and 36. All should seal if float is depressed. I test drove it and it is still boggy/skippy when taking off from a stop. So im thinking that diapragm is good. It will also do it in between gears while shifting right when I get back on the gas. Sounds like you are VERY close if not there. So i held the throttle open and it started just like before. Thanks. I don’t have exact jetting specs for your combo. But im starting to think i either have a battery issue or a starter issue. His 'good girl' wife is tempted; will she fall? https://howtomotorcyclerepair.com/how-to-tune-a-motorcycle-main-jet/. Hello Matthew, Seems like its running out of fuel or something. The fan dosnt come on till 225 the way the factory has it and drag racing it i always have that fan on to keep the temps down. Main will need to be increased by 2-4 sizes for sure. Thanks, Dunc. (on other cylinders, engine nearly stalls) I’ve got a Suzuki GSX1200 Inazuma which I modified a bit as a cafe racer. Hello, I need advice. Turning the fuel screws in or out makes no difference to the engine revs at all, you cannot hear or see rise on the auxiliary tacho fitted for the purpose of tuning. Clip is in the 3rd position and put in the 132 jet. My manual says crazy numbers for the factory setting on these carbs. Since your best idle is at almost closed fuel screw position, I would decrease pilot by 1-2 sizes and see if you can get fuel screw in the 1-3 turns out range. 185 (pilot air). So I pulled the carbs back out, completey disassembled, cleaned with Chemtool B-12 and reassembled with the original cleaned stock jets. It has an ignition advancer +2 and k&n filter. If it bleeds off, replace it. So I’m hoping to just adjust the mixture to fix it. Thanks! If you are close to 3 turns out, bump up the pilot jet 1-2 sizes. Hey Mathew, I have a 1998 Kawasaki 400 4 wheeler (actually 2 wheeler) I was not getting “high end” or fast acceleration so I rebuilt the entire engine including new carb. Thanks a lot ,now I can work from there!! I have no experience with swapping 2&4 stroke carbs. Thanks in advance. Hello. Someone is trying to destroy her marriage - who and why? My config: What are some indications of a rich pilot jet and/or screw setting? Sounds like wah wah wah wah wah all the way down the street until I give it a little more gas. I am new on here and have found it quite interesting. Electric tape, RTV, etc..never seem to hold up. I have a same year 360 stock besides aftermarket mufflers and cannot get it tuned right. Excellent video. During his early years Tommy grew interested in sports, BMX bicycles and motorcycles, in addition to soccer. So i held the throttle wide open and it turned and fired atleast. Currently the bike is hard to start and when it does the revs hang and will not idle, runs great at 1/4 and above throttle. yes indeed. I have been reading that a faulty diaphragm can cause havoc. Once it is one and I put the choke the bike turns off completely. Where do you recommend getting good jets for these bikes? So i went out and choked it and boom hydrolocked again. Brent, if it is stumbling/bogging/hesitating, you will need to go richer. But it was done at a way different altitude then where im at now. Black covered in soot. Ive actually done that like 5 or 6 times before just to make sure i wasnt missing something. If so, it might be a rich spot. Im kinda wondering if this is some of the problem. Go ahead and lightly seat your fuel screws noting how many turns it took. Will it run with choke off? I’d look to see if your float height is too high, or worn float needle. more quads that wont run to fix still.. and those are: Thanks. Yes it does. Revving the engine in neutral will result in hanging RPM’s, or RPM’s will slowly drop back to idle RPM. But plan on trying 2 1/2 but cant figure out how that would make any difference at wide open throttle. As it gets to higher rpm’s it goes crazy smooth. Hello Matthew, Still from that last long unsucessful ride and i start to adjust. What you are after when adjusting this screw, is to reach peak idle RPM and smoothness. 20’s and im at 1 1/2 turns. Maybe I should check something… The USB is actually a USB-NVMe converter with 64GB SSD. If the hesitation is a rich blubbery sound, try opening them up to 1.5 out. If it ran good at a certain setting and all of a sudden started running bad, it is not the settings. I’m from South Africa.I got hold of a Sachs Madass 125 with 3000 k’s on the clock.As far as I could see on the internet, these bikes are fitted with Mikuni carbs,whereas mine has a TK carb on (round/slide).Main jet=94,Pilot jet=40.Could you please tell me how many turns out, the air screw should be?Can’t get it to idle propperly THANKS. At WOT, vacuum is low, and you have a leak, so fuel delivery will suffer. Fighting my mother-in-law for the soul of my wife. Because I was idling it at 1500 before when my mixtures were way out. Your email address will not be published. Stock is 1.25 out. I am in Devon, UK and there is a lack of yamaha carb experts here! Smoked for a few minutes. I will report back my findings! the popping is finally gone (about 3 turns out on pilot screw). But I have a carb problem that no one cause solve!I have a 1985 CB700SC with low miles. Lots of people selling new engines and laughing at me! See if different needle jets are available. It will pull less fuel from pilot and jet needle at 1/4 throttle. Honestly, I don’t have much experience with TPS’s. Stuart, you should have an air OR a fuel screw, not both. 7. Would a worn needle and or needle jet give these symptoms. or is popping something i have to learn to live with? Too many armature mistakes almost caused this bike to be offered up as a eBay parts sacrifice. To be honest is was a little better but still ran similarly. It sat for about a week because it was raining. I have a 1980 Honda Xl 250S. I did try closing the fuel mixture screw all the way in, but the bike does not die. Still has good spark after dying. Also my temp is around 70s right now and altitude is 1400s above sea level, Sounds good. What should I try? More throttle does make it go away. Both pilots and fuel/air screw settings need to be the same. I could swear its a nitro rc car. Not yet, just hoped that previous adjustments would work. I like to have idle as low as possible when tuning fuel mix screws. But off idle it has a stumble I guess. You can get rid of it by richening pilot/fuel screw, but sounds like you need to go the other way, leaner, based off your fuel screw position. Oh and I didn’t know about the air screw. Any help is greatly appreciated! Matthew, first off, great site and really great and easy to undrestand articles. It’s way loud and if the mechanic tuned to proper specs, somethings off cause my old one never idled like that. Now that you have the TPS sorted out, reset your fuel screws for highest RPM, and note how many turns out you end up. I would try readjusting your fuel screw. Screwing this out richens the mix. He also put on quieter exhausts. can help me because I’m losing my mind with this thing and I’ve got 3 I am eager to hear what you think. I will tell you that some popping on decel is normal with an open pipe. If it starts fine w/o choke then it’s too rich. Also don’t go crazy in torque since the screw is brass. Try the size up you have and see what happens. If you are interested on how a carb is taken apart, check this video out: https://howtomotorcyclerepair.com/vulcancarbclean/. Hook both gauges up to one carb to see if gauges both read the same. Open up your carbs and write down what you find. Started fine next morning and has been good ever since. Can’t say I’ve looked at the plug after idling but will do at the weekend. 2-2.25 turns the engine starts to stumble. I’m gonna try 1 1/4 and see if its any better or worse. if there any possible the pilot jet was broken or the size is incorrect due imitation product? I decided to put in the 70 due the mods to both the air box and muffler. Any advice regarding this would be appreciated. You have been a huge help btw. Based on your video, I would guess that the pilot screw is too rich. I can get a so so idle at 1200 RPM with the Pilot at 3-1/2 turns out. Thanks. Thanks! I have a temp gun and all header pipes read in the same spot closest the the head in the 300-500 range so I know they aren’t foul’d completely just I’m sure very black from a few years of extremely rich mixture. So everything is fine except 1 little thing: fuel consumption. I would go through the adjustment procedure per the video. 679215 Registered office: 1 London Bridge Street, London, SE1 9GF. ©News Group Newspapers Limited in England No. A carb will have an air screw or a fuel screw 99% of the time. What are stock main sizes. It has 8 side holes on the top end, whereas the 2 stroke version doesn’t have any (it was a size 266). No sizzle mean cylinder is not firing. Leave an updated comment once you put some time/miles on the bike. I have a 1994 honda shadow vt1100c I am sitting at about 3.5 turn out. That’s what I have been experiencing with this bike. But the only thing i have changed is the mixture. I know throttle valves are pricey, but it may be worthwhile to try a larger/leaner cutaway with the 4 stroke needle jet. If you go back to the link I provided on tuning cutaway, there is a graph from Mikuni that shows each size changes fuel flow by 10%.

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