Venturer Running/stalling dilemna

[BA80]

You can give that a try moto but the idle mixture screws have very little if anything to do with the fuel delivery at 5K.

Just sayin'

If it is the carbs, which I'm not completely convinced it is, at 5k your going to be almost completely running on the main circuit and there is very little to it.

[motoman]

First off, apologies for my last statement as far as idle mix screw settings on the later carbs. I just proved myself wrong.

Previously having everything 'pinched' down due to the unknowingly low voltages and weak stock coils, the sync was wacked. First off vacuum was at 10-12in. across at the mercury and vacuum advance wasn't working properly with throttel plates opened improperly. Started with evil #3 master carb bringing vacuum back up to the 20in. range rotating #3 sync pairs screw back in. this gave a lean popping in rightside exhaust. Opened up #3 idle mix from the 2 3/8 setting to 3 3/4 approx. which made it happy again. Same for #4 and #1 and #2. This brought idle up substantually. Backed idle adjustment back down and synced #4 to #3. Synced #2 to #1. Then back to number #3 sync screw which which brought the #1/#2 pairs up to the now 16-16.5in. of mercury.
Shut it off and let throttle snap shut several times to seat threads of sync screws. Repeated that a few times till mercury held even across with throttle snaps.
Put seat and tank back on and rode it. Now it just has an ever so slight shudder under heavy accelleration and is just a bit slow coming up from 5K to 8K.
Going thru all this has I believe solved the major running issue. Now I'm gonna go back thru and pull carb bank and meticulously re-set float levels at 23mm instead of the 23.5mm I had them at, then checking running fuel levels. Then go back thru and do and exact dial in on the idle mixes and go thru the resync process again, which done correctly DOES take a bit of time shutting off to cool even having a large floor fan. Hopefully, this will end the Venturer's saga, and it will be back to its old self as it was a few yrs. back.

Any more tid-bits of helpful info. is most welcome, and I'll report back any odd missed carb internal findings and changes. Definitely appreciate all the suggestions and help. Sometimes I just need a little input to stir up my interest and get the wheels turnin' upstairs. 3Phase got the interest stired up and you all have kept it going. Now just gotta finish strong for it to count....Thanks all!

[motoman]

Before removing carbs, also am going to take T.C. suggestion and try the other two 4RO modules just to be sure mechanical advance is working. While here, initially 3Phase suggested that. He told me that the continious low voltage i had could knock out the internal mechanical advance funtion.
Surely one outa' three modules will eliminate the shudder under hard accelleration, if in fact that is the issue. Easy enough to do prior to carb removal.....one thing at a time, and patience, grasshopper.

[DGXSER]

IT is always a process of elimination with these things. The more we learn and experience, the quicker we can narrow the field. But there is always more than one possible culprit, and often times more than one actual culprit.

Glad you go the H back up to running order, hopefully it will earn a more active spot in your riding.

[motoman]

IT is always a process of elimination with these things. The more we learn and experience, the quicker we can narrow the field. But there is always more than one possible culprit, and often times more than one actual culprit.

Glad you go the H back up to running order, hopefully it will earn a more active spot in your riding.

Thanks DGXSER
When its running correctly, it IS super smooth, comfy, and a hoot to ride distances. Having the STeed just at times makes it easier to ignore the ole' Venturer. Easier to just jump on the ST and go any distance I choose, plus any REAL LD ride, hard to turn down that 50+mpg@ a constant 80mph for as long as you wanna sit(340-360mi. having a 7.4gal. tank under my backside).

[motoman]

Just a bump on the thread. Rode the bike in the annual ToyRun here. Temp. was 20F and bike sounded and run smooth with no stumble, blubber or hesitation up to 5K so as to avoid any embarrasment. Haven't pulled carb bank as of yet, even though man-cave stays in the 55-60F range. Have put it off since outside temps are barely getting out of the single digits for any decent test riding. With ignition, pri/sec. checking out all correct again and installed VF coils that actually put out decent voltages now, fairly sure didn't get all the science project remove from the main circuit up through the emulsion tube and the enricher circuit. Had one fuel filter that seemed a bit restricted when blowing through it compared to the other.

Changed both the little conical filters for two new little barrel type Polaris model fuel filters just prior to ToyRun........no difference in running, just eliminating the simple things that may be in question.

As of now, at 50some degrees in the man-cave, no enricher, it'll fire off in barely a couple revolutions, almost instantly, and being cold with no choke will idle at 5-600rpm without a lope. So that's red-flag in itself.

Get a bit of a 'heat-wave', and will be pulling carb bank going back through all things suspect, including a re-setting of float levels since the seats were removed and replaced O-rings when 3Phase was here. I know a meticulous re-setting of those will eliminate any suspicious fuel levels, or different fuel levels between all four carbs.

I'll bump this again soon when I find the gremlins and murphy's that I'm sure are right next to the snake-bite kit.

[D0wn5h1ft]

Just a bump on the thread. Rode the bike in the annual ToyRun here. Temp. was 20F and bike sounded and run smooth with no stumble, blubber or hesitation up to 5K so as to avoid any embarrasment. Haven't pulled carb bank as of yet, even though man-cave stays in the 55-60F range. Have put it off since outside temps are barely getting out of the single digits for any decent test riding. With ignition, pri/sec. checking out all correct again and installed VF coils that actually put out decent voltages now, fairly sure didn't get all the science project remove from the main circuit up through the emulsion tube and the enricher circuit. Had one fuel filter that seemed a bit restricted when blowing through it compared to the other.

Changed both the little conical filters for two new little barrel type Polaris model fuel filters just prior to ToyRun........no difference in running, just eliminating the simple things that may be in question.

As of now, at 50some degrees in the man-cave, no enricher, it'll fire off in barely a couple revolutions, almost instantly, and being cold with no choke will idle at 5-600rpm without a lope. So that's red-flag in itself.

Get a bit of a 'heat-wave', and will be pulling carb bank going back through all things suspect, including a re-setting of float levels since the seats were removed and replaced O-rings when 3Phase was here. I know a meticulous re-setting of those will eliminate any suspicious fuel levels, or different fuel levels between all four carbs.

I'll bump this again soon when I find the gremlins and murphy's that I'm sure are right next to the snake-bite kit.

I'm eager to see what you come up with. As you know I've been having the same issue and haven't been able to figure anything out.

Currently, I'm going on the hunt for an electrical issue. I've got a feeling it has something to do with a weak spark with me because when I lean out the mains it doesn't miss at all. I think from our PM's that you've already gone through your electrical but I'm going to give it a shot on mine.