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Old 11-20-2012, 11:42 PM   #16 (permalink)
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I read that the Mikuni requires vacuum to pull fuel into the bowl. I thought it was gravity-feed.
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Old 11-21-2012, 01:52 AM   #17 (permalink)
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Could this also be a timing issue? I didn't adjust the timing after my Dyna ICM because it said if your timing was good before the install that it should be good.

Thanks
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Old 11-21-2012, 05:06 AM   #18 (permalink)
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The mikuni is like any other carb in that it uses a float in the bowl to regulate the fuel level in he bowl - Vacuum does not even come into the discussion.

You seem to be all over the place with this problem....

You really need to slow down and check the basics like the ignition timing and jetting. Once you have a baseline picture you sand a way better chance of success.
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Old 11-21-2012, 07:09 AM   #19 (permalink)
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I'd get rid of the filter, at least until you've got it running

Do a google search for mikuni hsr42 tuning manual, that will get you a good reference and the exploded view. Big help when dealing with these.

A/f screw is on a/c side facing rider. Easy to get to even with the a/c on. Idle adjust is the big black cable hanging down with what looks like a Phillips head screw stuck in the end.

Once you have the jets set up like I posted (at this point even a 165 main is ok, which is what it should have shipped with ), and the screw set 1 turn, you can try increasing the idle a turn. See where that gets you.

If all this fails, id recheck the setup on the dyna2k, or even swap in the factory ignition just to try it out.
Beyond that, i would think it's a fuel delivery issue, so besides the filter check for any sharp bends in the line, and crack the gas cap loose in case the vent is causing issues (doubtful tho)
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Last edited by Blackened; 11-21-2012 at 07:12 AM.
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Old 11-21-2012, 07:21 AM   #20 (permalink)
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Quote:
Originally Posted by tussuck View Post

You really need to slow down and check the basics like the ignition timing and jetting. Once you have a baseline picture you sand a way better chance of success.
This is good advice, I would add that in the future add your mods one at a time, that way if there's an issue, you know exactly whats causing it.
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Old 11-21-2012, 08:07 AM   #21 (permalink)
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You do have the Mikuni purge fitting (used with emissions kit only) capped off, correct? It's the nipple directly below where the enrichener cable connects to the carb.

Last edited by cpmike; 11-21-2012 at 08:10 AM.
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Old 11-21-2012, 11:05 AM   #22 (permalink)
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Thermodyne is reading this now saying WTF is this? Thermodyne is reading this now saying WTF is this?
The VOES vacuum connection is just to any manifold vacuum source. As opposed to a ported source. At this point it's not relevant, just unplug it.

Start the scooter, just as it starts to stall, give it a spray of carb cleaner, if it revs up, you are way skinny on fuel.

So start it again and with the palm of your hand, choke the crap out of it. See if you can keep it running. If it will run, then you need more fuel or less air. Double check for a huge vacuum leak. If not, clear your calendar for the afternoon.

Pull the fuel line and make sure the line flows freely. Then pull the carb. Pull the bowl and make sure the float is set correctly and that the valve flows freely. It's messy, but I'd put the carb back in place with the bowl off and reconnect the fuel line. Open the petcock and see if it flows. It wouldn't be the first one I ever saw where the line internally kinked when the carb was bolted up.

Check the jet sizes, the list above looks good. I'm sure there are internet sites with starting jet lists.

Spray carb cleaner into each jet and verify that it sprays through into the bore.

Just for shitsandgiggles make sure the slide moves, and seats properly.

At this point, it's time for an expert. You'll be checking for drill through errors, blocking plugs, casting defects and such. With no prior experience with that carb, or any other the way I read it, you will be in over your head.

With that said, I'll bet that an old 38mm side draft would look good about now
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Old 11-21-2012, 11:51 AM   #23 (permalink)
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+1 to thermodyne for great garage style advice

Tbh I used the mik because I had it, and I'm a stubborn bastard, so I resolved to learn it inside and out and MAKE it work, and that being said, it's a little sensitive to hot/cold weather but it works very good.

If I had it to do over again I probably would have just gone with a super E. Very easy carb, basically set it and forget it.

Just my .02
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Old 11-21-2012, 10:23 PM   #24 (permalink)
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I put a Super E on my shovelhead and it was a breeze. Nothing beats these Mikunis for throttle response in my opinion. I am going to time the bike soon as my first step. I turned the idle screw all the way in and backed it off a few turns. Still no dice. HOping it's something easy here soon.
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Old 11-21-2012, 10:27 PM   #25 (permalink)
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I also have the tuning manual, and it doesn't tell you where the standards or "0's" are. Like turn this knob all the way to the right and then left two full terms. I could have had a 2 year old mess with all of these settings and I would really not have an idea where they are suppose to be set from the factory.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-21-2012, 11:10 PM   #26 (permalink)
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Quote:
Originally Posted by cpmike View Post
You do have the Mikuni purge fitting (used with emissions kit only) capped off, correct? It's the nipple directly below where the enrichener cable connects to the carb.
Isn't that vent suppose to be open for fuel overflow? Had a tube on it and ran it to the bottom of my frame to drain.
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-22-2012, 12:12 AM   #27 (permalink)
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Quote:
Originally Posted by Krowbar View Post
Isn't that vent suppose to be open for fuel overflow? Had a tube on it and ran it to the bottom of my frame to drain.
purge vent is in the back, cap is #83 on this diagram. Should be a black cap on it from factory.

http://www.mikuni.com/pdf/tm42xview121801.pdf

Think it's about time to check your ign timing though
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Last edited by Blackened; 11-22-2012 at 12:15 AM.
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Old 11-22-2012, 10:32 AM   #28 (permalink)
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Could be as simple as did you set the Dyna 2000 correctly? As in single fire vs dual fire? Why is the bowl vent pissing fuel? Fuel air spark = bang. Something is missing from that equation. Make sure both sides of the coil are firing. Just pull the plug wire off the plug and stick a screwdriver in. Hold the metal and crank it over. You will know for sure if the coil is firing. Try one cylinder at a time.
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Old 11-22-2012, 01:19 PM   #29 (permalink)
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Quote:
Originally Posted by crankyoldguy View Post
Could be as simple as did you set the Dyna 2000 correctly? As in single fire vs dual fire? Why is the bowl vent pissing fuel? Fuel air spark = bang. Something is missing from that equation. Make sure both sides of the coil are firing. Just pull the plug wire off the plug and stick a screwdriver in. Hold the metal and crank it over. You will know for sure if the coil is firing. Try one cylinder at a time.
I think I'll just see if I can get the spark to arc on the head or something... haha

I need to time the bike I think. I have to wait for my rear wheel to get back from the powder coater so I can use to help find TDC easier. Timing could very well be the issue. It only cranks and fires for a second and the bike shakes a little. Could be timing. Hopefully so. I only put 50 miles on my FXR before i started its winter makeover... haha
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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Old 11-22-2012, 01:38 PM   #30 (permalink)
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Quote:
Originally Posted by Blackened View Post
purge vent is in the back, cap is #83 on this diagram. Should be a black cap on it from factory.

http://www.mikuni.com/pdf/tm42xview121801.pdf

Think it's about time to check your ign timing though
My Mikuni doesn't have that purge vent. What's this mean? haha
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1985 FXRS: Dyna 2000 ICM, Twin Tec II Single Fire, Mikuni HSR 42mm carb, S&S intake, Progressive 11.5" rear springs, progressive front sprigs, SPF Lightningheader exhaust and bars, rebuilt front forks with brace (lowered back to 25.5"), Arlen Ness fairing, all new electrical, shyt-ton of powder coating etc. etc.
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