Starting a rusty '82 KZ750

www.amazon.com/d/Motorcycle-Tool-Kits/MO...s-08-0426/B0050CGRDM

Your vaccum sync gauges need some restrictors to flatten out the vaccum pulsing.
Don´t use the gauges without any restrictor or you will destroy or de-calibrate them.

My sync gauges have adjustable restrictors to minimize the needle shaking.



Some pics of the internal parts of the adjustable restictor mechanism
If you turn the adjuster you qweez the rubber washer and minimize the bore.
bore ID of the spare rubber washer is 0,10 mm !!!

Nessism wrote: www.amazon.com/d/Motorcycle-Tool-Kits/MO...s-08-0426/B0050CGRDM

Thanks. Where do these mount exactly?

Into your rubber vaccum tube right in front of your sync gauge tube connectors.

Looks like a stupid idea but some more or less tight nods do the same effect.

Ended up using the brass restrictor/adapters that came with the air guages and coupled them with my water bottle system. I liked my adjustments to be more fluid (pun intended). With screwdriver/socket combo tool that came with the kit, I was golden. Using that tool was like night and day over a wrench and screwdriver!!

Like Scirocco shows in the photo with the brass thimbles...
It's important to have really small diameter restrictors in the hose end nearest the engine.

This isolates the volume of air in the tubing from the air in the manifold. This prevents the sync apparatus from affecting the vacuum in the manifold, and also smooths out the pulses to the gauges.

The restrictors don't need to be identical as long as they are much smaller than the tubing. Their openings need to be clear and clean. And the material needs to be rigid so they maintain their shape during the high-vacuum pulses. Some cheaper plastic ones flex under vacuum and that can affect the reading a bit. Having dirt or debris in the restrictors that affects air flow in one direction more than the other will also affect the reading a bit.

loudhvx wrote: Like Scirocco shows in the photo with the brass thimbles...
It's important to have really small diameter restrictors in the hose end nearest the engine.

This isolates the volume of air in the tubing from the air in the manifold. This prevents the sync apparatus from affecting the vacuum in the manifold, and also smooths out the pulses to the gauges.

The restrictors don't need to be identical as long as they are much smaller than the tubing. Their openings need to be clear and clean. And the material needs to be rigid so they maintain their shape during the high-vacuum pulses. Some cheaper plastic ones flex under vacuum and that can affect the reading a bit. Having dirt or debris in the restrictors that affects air flow in one direction more than the other will also affect the reading a bit.

Yeah, after some research and trial and error, I get the concept. I used the brass from the kit as can be seen in this video. I didn't like the air guages after all.

I haven't been commenting on this thread because your avatar is too distracting IMO.
Steve

SWest wrote: I haven't been commenting on this thread because your avatar is too distracting IMO.
Steve

I'm sorry Steve. Didn't mean it to offend. I'll change it up. BTW is the reaction of the guy in the background I love.

Not that it's offensive, just distracting. Can you make it a GIF image?
Steve

SWest wrote: Not that it's offensive, just distracting. Can you make it a GIF image?
Steve

Oh. You don't like it as a moving gif? I see. But is SOOO impressive. This man's amazing feat would be trivialized in a still shot! I mean, how can I prove he drank the WHOLE thing? :ohmy: