XV1100 Virago

[motoman]

Hi BA80,
Just curious, does that occur during WOT application from a lower rpm up through the upper rpm range, or just in motors upper top-end rpm WOT application.

[BA80]

Any time the throttle is over 3/4 EXCEPT when sitting in the garage without being under a load. It runs perfectly until it's on the road.

I'm gonna pull the TCI out and open it up and see if something is going on in there.

If it was an XS I'd be all over the pick up coils on this one.

[3Phase]

An electrical problem on WOT. <scratching head>

Bad primary ignition circuit, not enough voltage at one of the coils or the TCI.

Bad secondary ignition circuit - coils, spark plugs, plug wires. Swap the plugs/wires/coils and see if the problem follows the swap.


Bad boost sensor, like the XJ11. Does it stop if you disconnect the harness from the Boost Sensor, not just the vacuum line?

Bad TCI.

One of the safety interlocks is loose, out of adjustment or broken, a relay is intermittently cycling the ignition power On/Off, or something is grounding the TCI kill wire, like the XS11 tip over switch wire, when you move the throttle/throttle cable at WOT.


Does the tach run from a junction in one of the TCI wires from the negative side of one of the ignition coils, like the coil for the rear cylinder, or is it like the XS/XJ and runs off the stator?

Bad tachometer. Does the problem go away if you unplug the tach?

Bad rev-limiter, if it has one. Unplug the tach.

Bad pick-up coil/loose wire/connector. Check the harness/connector. Last resort, swap the pick-up coils. I don't know what the air gap should be on your Virago but I'd check everything else before messing with the pick-up coils.

.

[Bonz]

Is the popping a noise like lean pop on deceleration, or is the bike "popping" like its lurching and surging?

I keep watching and listening to the video you posted, you sure it's not running really lean up top on WOT application? Like the needle could use another shim or the main could go up a size?

I just went through a month and 1500+ miles of adapting ZZR1200/ZX11 40mm downdraft carbs onto my 2001 ZRX1200. I had to start with the proper main jet as the first step. I knew about where to start, but with your springs being back alley, per se, and not sure, you may need to chart some new territory?

Have you gone up a size or two in main jet size, for grins if anything, and see if that helps? It would be helpful to establish a trend. I.E. more jet equates to better or worse?

Nothing else is working that you have tried and that is where I would spend the next couple on/offs of the carbs.

Pardon my post if I missed something earlier in the thread that already talked about what I said.

[BA80]

An electrical problem on WOT. <scratching head>

Bad primary ignition circuit, not enough voltage at one of the coils or the TCI.

Bad secondary ignition circuit - coils, spark plugs, plug wires. Swap the plugs/wires/coils and see if the problem follows the swap.


Bad boost sensor, like the XJ11. Does it stop if you disconnect the harness from the Boost Sensor, not just the vacuum line?

Bad TCI.

One of the safety interlocks is loose, out of adjustment or broken, a relay is intermittently cycling the ignition power On/Off, or something is grounding the TCI kill wire, like the XS11 tip over switch wire, when you move the throttle/throttle cable at WOT.


Does the tach run from a junction in one of the TCI wires from the negative side of one of the ignition coils, like the coil for the rear cylinder, or is it like the XS/XJ and runs off the stator?

Bad tachometer. Does the problem go away if you unplug the tach?

Bad rev-limiter, if it has one. Unplug the tach.

Bad pick-up coil/loose wire/connector. Check the harness/connector. Last resort, swap the pick-up coils. I don't know what the air gap should be on your Virago but I'd check everything else before messing with the pick-up coils.

.

All the same questions in my head Scott. I'll be checking each one. I've already done some checking with the VOM on the coils, caps and load sensor but I'll be going back over it. All the switches were corroded from sitting in the weather so I'm gonna check ALL connections. The safety switches (clutch and sidestand) seem to have been bypassed already.

[BA80]

Is the popping a noise like lean pop on deceleration, or is the bike "popping" like its lurching and surging?

I keep watching and listening to the video you posted, you sure it's not running really lean up top on WOT application? Like the needle could use another shim or the main could go up a size?

I just went through a month and 1500+ miles of adapting ZZR1200/ZX11 40mm downdraft carbs onto my 2001 ZRX1200. I had to start with the proper main jet as the first step. I knew about where to start, but with your springs being back alley, per se, and not sure, you may need to chart some new territory?

Have you gone up a size or two in main jet size, for grins if anything, and see if that helps? It would be helpful to establish a trend. I.E. more jet equates to better or worse?

Nothing else is working that you have tried and that is where I would spend the next couple on/offs of the carbs.

Pardon my post if I missed something earlier in the thread that already talked about what I said.

It's fine on decal and below about 3/4 throttle. The problem is ONLY above 3/4 throttle and ONLY under load. As far as I know it was running good until it was laid down hard on the right side and then parked since 09. In the weather.

[motoman]

It's fine on decal and below about 3/4 throttle. The problem is ONLY above 3/4 throttle and ONLY under load. As far as I know it was running good until it was laid down hard on the right side and then parked since 09. In the weather.

........faulty cap vent?.......JAT.

[BA80]

The tank isn't even on it. It's running off the reserve tank and the hoses are open. Besides, this thing has a fuel pump.

[3Phase]

The tank isn't even on it. It's running off the reserve tank and the hoses are open. Besides, this thing has a fuel pump.

Is the fuel pump pressure and volume okay? The tank/pump aren't clogged with a tiny piece of ethanol Jello (or worse)?

[BA80]

Yup, yup, and yup. Flushed out the reserve tank good, new lines and filter.

I'm starting to lean towards an ignition issue. I've had the carbs apart 3 times and they sparkle inside and are adjusted perfectly and never has it made a difference.

I wish XS parts interchanged, I don't have any known good XV parts to swap out as a test.

[Bonz]

Ok, what about your plug wires? I had a plug wire shorting out under load on another vehicle, and gave the symptoms you have. The more load, the worse it was.

[BA80]

It's definitely a possibility Bonz. When I was having an issue with #2 plug today, if I pulled the wire off the plug the spark jumped through the insulation to the carb strong. The problem is the coils are like our XS coils. The wire is integral.

[Bonz]

Gotcha! Thanks for being so thorough in follow up to my questions!

[3Phase]

Gotcha! Thanks for being so thorough in follow up to my questions!

+1 what Bonz said!

[BA80]

Anyone got a #1 coil cheap? (rear cylinder)

That's what I meant to say before. I can't get used to the rear cylinder being #1.