Reddit reviews MOTION PRO CARBURETOR ADJUSTING TOOL

Wait, cone filters? I wonder if the carbs have been rejetted to factor that in. If those cones are restricting air then that's why you're running rich. If the jets have been upgraded too large of a size then that's another reason. I'd find out what your stock carb's jet sizes are supposed to be, then I'd use an online calculator or ask a website that sells jets what size you should have given the mods you've got. And compare that with what you actually do have. So you're still gunna have to pull your carbs to check your jet values. You might even have a clogged air circuit in your carb bodies so cleaning is still imperative.

You could try making your own sync tool but if you have too strong of a vacuum then whatever liquid you're using will get sucked in. This is expensive, but a 'cry once buy once tool': http://www.amazon.com/Vacuum-Carburetor-Synchronizer-Carb-Gauge/dp/B004MSJ7E6

So is his buddy, I'm not sure if you need this for your carbs, I need it for mine: http://www.amazon.com/Motion-Pro-Carburetor-Adjusting-Tool/dp/B001DDH2ZY/ref=pd_bxgy_263_img_3?ie=UTF8&refRID=00QXJ3CH1BBWNM7K2FPZ

You could sync the side carb bodies with a regular screw driver and wrench, but once you move to the center 2 bodies that becomes almost impossible.

Here is a link to your manual that deals with the carburators: http://www.honda4fun.com/pdf_man_officina/pdf_manuali/CB350-400/CB350-400_04.pdf

I would take pictures and notes while doing this. There's not a huge wealth of information for 1972 CB350F carbs unfortunately.

You should register at this forum. Any questions you have they can help you out with: http://forums.sohc4.net/

I'd also pick up this ultrasonic cleaner from harbor freight: http://www.harborfreight.com/25-liter-ultrasonic-cleaner-95563.html Go to the dollar store, dollar general or whatever the cheap store in your area is called and buy a large bottle of LA Awesome and a gallon of diluted water. Stuff makes the dirtiest carbs come out brand new. Maybe be a total scumbag and return the ultrasonic cleaner for a full refund as soon as you're done with it. Should take a day to clean all the parts once your carbs are completely dismantled. Then spray a light hit of WD40 on the metal and polish it off with a paper towel to prevent corrosion.

This is another cool tool to have: http://cdn1.bikebandit-images.com/blog/images/2015/carb-cleaner-kit.jpg If you have an air compressor use a basket ball filling needle to blow all the passageways clean. Or a can of air. This goes without saying but carb cleaner will eat rubber, brake cleaner is almost as strong but safe for rubber.

Random tidbit here is an awesome trick for polishing the float needle seats on a carburator: https://www.youtube.com/watch?v=zlez_hdoWYk when they're dirty it can cause them to stick.

In closing this is going to be a good amount of work and money (Unless you return everything shamelessly) Rubber consumables on your carbs appear to be float bowl gaskets and a few orings, maybe some rubber fuel lines. Nothing too pricey.

By no means am I an expert so I can't say if your jets & pods are acceptable but I went through this with an 81 cb750f a couple years ago. My understanding is that bench syncing is kinda a misnomer and only gets them in the ballpark area. You need vacuum to properly sync them to your engine.

I tried to half ass it for a while but I was just driving myself crazy. I bought this kit and adjustment tool, popped the fuel tank off, ran a fuel line to a soda bottle of fuel and synced them properly in 10 mins. Night and day difference.

https://www.amazon.com/gp/product/B00T80OR52/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

https://www.amazon.com/gp/product/B001DDH2ZY/ref=ppx_od_dt_b_asin_title_s01?ie=UTF8&psc=1

If I recall correctly, there's a small screw on each carb that comes off and you'll thread on one of the long tubes from the kit then attach the vacuum lines to the gauges. There's plenty of videos showing how to do it. It seems like a daunting task but when you have the correct tools it's actually not that bad.