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Discussion Starter #1
Been looking in to TB synch. procedures, Twinmax looks nice but I don't know if it is still made, also found a Morgan carbtune that looks quite promising.

Any Hi Tech wrenches used either one of these?

Thanks,

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You've probably already seen that many people build their own manometers. There are a lot of different styles. From all the research i did before making one, depending on the liquid used, some people have said a more accurate sync can be done with a diy version
 

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I have the Morgan Carbtune and have used it several times. It has performed flawlessly. I have added extensions to the throttle body vacuum ports to make its use easier.

Here's a link to one of many sites/threads on making your own: $1.55 Carb Sync Tool by Marty Ignazito
 

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I have the Morgan Carbtune and have used it several times. It has performed flawlessly. I have added extensions to the throttle body vacuum ports to make its use easier.

Here's a link to one of many sites/threads on making your own: $1.55 Carb Sync Tool by Marty Ignazito
Mine is self made and similar. Except I used denatured alcohol and some color from a sharpie pen. Without color its too difficult to see. The alcohol will not cause any problems if it gets sucked in. No need to have any graduation on the stick or board that holds the tube. You just try to balance both levels as good as possible.

The biggest pain is to install the extension hoses, but you have to do that only once. :)

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The original mercury sticks or the homemade redneck manometer, give the best and most stable readings IMHO.
 

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Discussion Starter #6 (Edited)
more tools

Yeah, but its another tool to own. I spend all my money on alcohol, power tools and firearms then just squander the rest.

I like the Morgan unit, 46 quid ain't bad from the UK.

Seriously, your replies are genuinely appreciated.

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I have much love for my Morgan Carbtune. As a nice bonus, it also works great on three and four cylinder bikes.

I see little point in pissing around for hours building a homemade manometer that can easily lead to slurping up an intake full of oil or whatever. You can't get mercury sticks any more, and the twinmax is spendy and limited to two cylinder bikes.

Motion Pro makes a manometer that uses a mysterious fluid that's not mercury. But for the same or less money, get a Morgan Carbtune. You can stick it in a drawer when you're done, it'll last for decades with no need to fart around with fluids.
 

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Discussion Starter #8
Morgan Carbtune

Amen to that Bwringer,

They make a 2 cyl. as well...

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Just received my Carbtune Pro 2 yesterday and....

it works perfectly; much better than my old Motion Pro mercury unit. Plus, there is no liquid to spill or get sucked into your engine. Sent from the UK to California in less than 10 days. Me likes a lot! :thumbup:

Amen to that Bwringer,

They make a 2 cyl. as well...

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Another +1 for the CarbTune. No liquids, no mess, no chance of sucking fluid into the intake, all in a nice compact tool that comes in its own padded carrying case that you can keep in your toolbox. I was nervous at first about ordering something from England, but it arrived really fast, and using your credit card is hassle free.
 

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I recall making one from to bottles with a tube running down into the fluids between them, and then one tube from each going to each TB pulling from the head of air above each bottle. The low pressure would cause fluid to go from one to the other. Micro bubbles in the fluid would tell the direction of flow. A perfect balance could be achieved by having fluid level even and no motion of fluid from one to the other. The bubbles in the transmission fluid used would just vibrate in place back and forth. That was the most accurate tool I used. I now use the Morgan carb tune. It takes up less room to store, and no worries of a tip over causing issues. It does a good enough job.

I question why the air filter has to be removed to sync? It seems to me. That the sync should be better when done with air filter in place. That way the TB are in sync when operating, vs being equal with no intake restrictions.


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Never have removed the air filter, or anything else.

I question why the air filter has to be removed to sync? It seems to me. That the sync should be better when done with air filter in place. That way the TB are in sync when operating, vs being equal with no intake restrictions.


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Agree with you 100% on this!
 

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I question why the air filter has to be removed to sync? It seems to me. That the sync should be better when done with air filter in place. That way the TB are in sync when operating, vs being equal with no intake restrictions.
Funny you should mention this -- I used to sync the TBs with the airbox removed and using a looooooong screwdriver to twiddle the screw, as per the procedure in the manual.

However, at my most recent valve check a few weeks ago, I found, with some experimentation, that I could leave the airbox in and juuuuuust barely reach the sync screw with one hand and two fingers holding a little screwdriver bit holder. (The side plastics were removed.)

At the cost of a slightly cooked and scraped hand, I did the sync this way and was astonished to find the bike is now idling and generally behaving itself at low RPM far better than ever before. I mean, it is seriously a pronounced difference. (There were no other changes -- valve clearances were identical to where they were 20,000 miles ago.)

So yeah, I would say that you definitely get better sync results by leaving the airbox in. I'm now looking around for an even more compact bit holder, but so far pickings are slim. Basically, I want the world's shortest stubby screwdriver -- a knurled disc with just enough of a JIS Phillips bit sticking out to do the job.
 

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I always use just my fingers, I am wearing latex free exam gloves while doing such.
 
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