GL1200 GOLDWINGS

Full Version: Chug-a-lug in 4th and 5th at slower speed
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Guest

I have done everything to solve this problem except to learn how the vacuum that goes into the electronic unit works in relation to advancing the spark when the bike is in 4th and or 5th gear. The manual says there should not be any vacuum on the hose to the light (I assume this is the ODrive light on the dash. (This is an Aspencade bike)

Can anyone help me find me solve this problem. I am to the point whee I tend to believe I need to replace the electronic unit.

Thanks

mtwinger

A new member
I have never seen or heard of an electronic ignition unit going bad on a GL1200, although anything is possible. I'm more inclined to believe that if all the vacuum hoses are good then I'd be finely synchronizing the carbs and keeping the RPM above 2100 in 4th and 5th gears. The GL1200 engine does not like to lug at low RPM so keep the revs up.

Guest

The vacuum supplied to the control unit is from a "ported" source. This means there is no vacuum present until the throttle plates are opened. No vacuum at idle.
Once the throttle is open, the vacuum is supplied to the control unit. How sophisticated the control unit is, I don't know. I believe it is just looking for an "off idle" signal. The actual timing control doesn't take place unless you're in fourth or fifth gear. That input to the control unit is from your shift selector switch in the front cover.
The control unit could care less how much vacuum is being supplied. It ignores it until it see's the "top gears" position. The control unit has no "control" over the amount of vacuum supplied.
I've seen a lot replaced, but like Vic, I've never seen one bad. And don't "lug" it. Vic said 2100rpm. I prefer 3000. You can go lower, you just can't complain.
And welcome to the site! \:d/
Welcome mtwinger - you might be asking too much at to low an rpm like the guys said - somewhere on the site there are posts showing the 1200's peak torque is at 3500 rpm or so - so it likes to pull away hard at 3000 and above. You can putt putt along on flat road/street at 2000 rpm but it is not a fuel injected V-twin with 4-1/2 inch pistons that will pull away from 1000 rpm - I was taught to ride with some throttle in "instant reserve" so I tend to ride in a gear that the bike will accelerate if asked to especially in heavier traffic to miss the cell phone lane changer #-O etc.
wing&aprayer Wrote:You can putt putt along on flat road/street at 2000 rpm but it is not a fuel injected V-twin with 4-1/2 inch pistons that will pull away from 1000 rpm - I was taught to ride with some throttle in "instant reserve" so I tend to ride in a gear that the bike will accelerate if asked to especially in heavier traffic to miss the cell phone lane changer #-O etc.

I agree -- as a totally intuitive rider who tries to "feel" the RPMs from which a bike "likes" to accelerate ... kind of like tuning a guitar. When my 1200 feels like what it "prefers" in each gear that usually shows up on my tachometer as between 3,000 and 3,500 RPM.

There's another spot I call the screamer, at about 4,500 RPM which will give a big burst of acceleration by turning the throttle up to 5,500 [to miss the cell phone lane changer] -- but at those times it makes a sound like it REALLY would rather be in the next higher gear. :evil:
Granpah, you don't need to be in the next gear until a much higher RPM than 5500. At 5500 RPM the GL1200 engine is just starting to build serious horsepower and will do so until it reaches 7500 RPM. On my modified GL1200 engine I would regularly spin it up to 8000 RPM and then hit second gear at which point the front wheel would lift off the ground about 4 inches and I was gone according to my Harley riding buddies and they could not catch me no matter how hard they tried. The GL1200 engine is an incredible engine, smooth cruising power, good fuel economy and an amazing reserve of power. The only thing it lacks is bottom end torque but a smart driver knows how to make up for that.

Guest

Thanks everyone for all the great tips. Everything that was said makes sense and my bike conforms to what you all are saying.

I just sold this bike to a friend and I wanted it to be working top notch. It does really want to get out and go when at 3000 rpm or above.

I have a 89 goldwing and a 99 vulk. I enjoy both of these bikes.

mt winger