Carb stix, new one on me...

[4everFJ]

I did a side by side test between the CarbTune and the Motion Pro. I adjusted the carb's first with the Morgan, as close as I could get it, then put on the Motion Pro stick to see how close I came according to the readings on the wet stick. I was close with the Morgan, the columns being about 1/2" off as shown on the Motion Pro wet stick. The Motion Pro wet stick with it's longer columns allowed just a tiny bit more fine tuning.

Just curious.. How do you know that it was the Morgan that was inaccurate and not the Motion Pro? Did you verify with a calibrated vacuum source?

I have both the Morgan and one with dial type gauges (can't remember the name). They do not show exactly the same readings and I find that my bike runs smoother when synched with the Morgan.

[FJ1100mjk]

How do you know that it was the Morgan that was inaccurate and not the Motion Pro? Did you verify with a calibrated vacuum source?

Good point. But who has access to a known calibrated vacuum source? I don't. Or for that matter, there's many of us that have 30-odd year old engines with multiple previous owners, that with the exception of valve lash adjustments and carb rebuilds, have been left as-is, so the conditions of their vacuum inducing components are questionable/unknown anyways.

Motion Pro, Morgan Carbtune, homemade manometers, dial gauges, whatever you are using, in my opinion, doesn't matter so much as having the vacuum readings of each cylinder as close to each other for the particular RPM you are adjusting at, as long as their base value is not grossly off from what is stated in the bike's particular Factory Service Manual.

I've gotten away from using liquid type manometers years ago, and transitioned to the Morgan Carbtune. Very happy with it too.

Mis dos centavos.

[4everFJ]

Motion Pro, Morgan Carbtune, homemade manometers, dial gauges, whatever you are using, in my opinion, doesn't matter so much as having the vacuum readings of each cylinder as close to each other for the particular RPM you are adjusting at, as long as their base value is not grossly off from what is stated in the bike's particular Factory Service Manual.

Agree, but it is important that all 4 gauges/columns shows the same with the same vacumm source (i.e. connecting all 4 to the same source). This is where I have found the Morgan to be more accurate than the dial type one I have.

[Ranman85FJ]

Randy, thanks for the info and suggestions, as always!  I'll make some adjustments, check the o-rings and fluid level, and have another go.  I do agree, a nice gauge set would be much easier to work with.

[Pat Conlon]

Motion Pro, Morgan Carbtune, homemade manometers, dial gauges, whatever you are using, in my opinion, doesn't matter so much as having the vacuum readings of each cylinder as close to each other for the particular RPM you are adjusting at, as long as their base value is not grossly off from what is stated in the bike's particular Factory Service Manual.

Agree, but it is important that all 4 gauges/columns shows the same with the same vacumm source (i.e. connecting all 4 to the same source). This is where I have found the Morgan to be more accurate than the dial type one I have.

Yes, I agree with both of you. The Motion Pro stick I used was the old mercury version. I did check all columns on both the Morgan and Motion Pro sticks to see that they were reading correctly. I did this by connecting each of the 4 hoses up to my #1 cylinder vacuum port. The readings were identical on the wet stick. This is how I found that the #3 column on the Morgan had a hanging rod.

I still use my Morgan, my Motion Pro now resides with Leon.

I just noticed the longer columns on the wet stick gave a *tiny bit* better resolution for fine tuning.