VMX1200 Carb Question
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- เผยแพร่เมื่อ 8 มิ.ย. 2013
- Just had a question to other Vmax owners, if your carbs act the same way. Trying to get her back on the road after having cleaned Carbs pump and tank from crap that formed after using Sta-Bil and E10 Gas over the winter.
- วิทยาศาสตร์และเทคโนโลยี
I'm about to finish my total rebuild V-Max......looks brandnew. I did the carbs on the bench, total rebuild and synchronised them as precise as I could. 3 turns out and tomorrow when the battery comes it's first start after i previously tested the carbs before taking the bike apart....at that time it ran on choke only and I discovered they messed with the settings and on the bench I could see the carbs where not in sync. So I hope the bench sync works. Off course I use Haynes, the big book with coloured pictures.
The carbs are way easier to get off and work on than it looks,, don't be afraid!!
Drill out the brass plug at the bottom of the carb cap. Count the turns in on all 4, then play around backing them out. Mine were all out at 5 turns, I know,,,,,too many but at 4 turns out it was starting to bog. Time for a cleaning.
Air leak suggest right bank of carbs
Check rubber mounts for cracks and tighten clamps
Got the bike last year to save gas. It was running much better then. Used Sta-Bil for the winter, (my mistake). Left a bunch of crap in my tank and needing a tow truck. Cleaned out the tank. Removed the carbs for a good cleaning, found a lot of crap in there. New diaphragms. Checked & cleaned fuel pump. Synced carbs. Checked plugs. Power loss around 4K RPM and above (Boggs down). 4K and below, has horse power. All other jets were seated. The pilot screw seems to be the only adjustable one(s).
vmax is not a bike to save gas , you meant burn gas efficiently ?
fernominal is mistaken. All 4 carbs are feeding their respective cylinders at all times. V boost kicks in at 6000 rpm and the butterfly valve between cylinders 1 and 2 and the one between cylinders 3 and 4 open up which allows 2 carbs to feed each cylinder during their intake strokes. Opening the butterfly valves from idle actually detracts from horsepower because the cylinder cannot process that much raw fuel at low rpm. Someone made a lot of money selling the idea of bypassing the servo motors.
If all of your carbs are Synchronized, (I hope that you used a mercury filled synchronizer for synchronizing all four carbs at the same time) only two carbs are being used at idle engine speed. That's why whn U cover up the lower carb on the right shown, it increases the vacume or the left carb. There's a cable running underneath the carbs (from throttle) that opens all four carbs at the same time. I set mine for all four cabs to be always open. (uses more fuel but sounds and runs awesome)
Working on it again tonight trying to resolve this power problem. While sitting there, tried to rev it up over 5K and it sound like it sucking in too much air and not enough fuel to burn. Sounds almost like all air around 5K. So tried to cut down on some of the air intake by putting the air box on and it rev’d consistently over 8K but still had no power when I test rode it in 2nd gear. If weather permits tomorrow, will check the new diaphragms
I put the stock main jets in she’s running like a bat out of hell. Last weekend was the 1st time I've ever felt the V-Boost kick in.. DAMNNNN that thing is fast.. You'd better hold on tight cause it’s a kick in the ass.. I’m just doing some other fixes now. The previous owner put some compound on the screws around the bike and locked the parts in place. I had to use a jig saw to remove one that was stopping me from removing my fuel tank.
Fuel tank is in the frame under seat. Follow the fuel line (from tank) to your fuel pump, and make sure its ok. It looks like the bottom right carb jet (on video) could be clogged.
I'd say clogged pilot circuit. If the carbs are synched and the idle is at 1000 rpm and everything is right it should not take so long to drop to idle. Sounds like the idle screw is turned in to compensate for the poor tune state. I'd check the pilot circuit. There are 2 pilot air jets and like 4 holes under the vacuum chamber cover that are part of it. They are easy to get blocked and will cause all sorts of troubles.
Well, Mercury filled tubes are no longer legal to sell. I used the Sync Master Pro (blue liquid). I got them all synched up.. The real problem I found was that the previous owner put too small of main jets in the carbs. I thought I had it nailed down when I found my carb boots were cracked but it made no difference until I found the jets installed where WAY too small for that size engine and power. Not the bike has plenty of power.
$15 bucks to get back and forth to work for a week vs $60 using the car.
i tried to reply to yourquestion on the video you commented on but was having issues. From the factory, they were all at different turns. If all you're doing is backing them out 2 full turns, to put them back you just turn them in 2 full turns. I can give you MY specific factory settings if you want
RPMs on tach should be 1500 rpms. when it gets to 6500 rpms is when the V-Boost kicks in, and all four carbs are open together. (Try sticking your hand underneath the carbs, and manually moving the mechanism (with cable attached) and (standing on the left side of the engine) open and hold it there for a min and if your engine sounds like it has a full race cam, then it's OK. Drive it around and get all that bad fuel out. then clean spark plugs, and it should be fine.
jetting/ fuel mixture is off
Why did you buy a V-Max to save on gas?? (mine only got 110 miles per five gallon tankful??)(The new Harley Dynaglide gets around 325 miles per five gallon tankful.)
These tanks are almost 4 gallons or 15 litres.