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I wasn't having a venting issue. I was having a fuel spillage issue. Both of my tanks also had the no lead nozzle baffle or whatever its called removed before I got them. I have no idea if that is a contributing factor.

I got tired of buying gas caps trying to fix this fuel slosh issue. The ZETA cap I put on the Gray Ghost that fixed the issue is unobtaimum. I have searched everywhere. Tried to contact ZETA directly in Japan. They don't reply.
In desperation I shelled out $90 for a factory Yamaha cap. Same results if you fill it too full (within an inch of the top) it pukes gas out of the key hole.
So I decided to modify one of my Chinese caps.

5/16 drill bit and the lock cylinder came right out.

A piece of 3/8 fuel line is a perfect friction fit and the same $5 vent valve I put on the Gray Ghost fits perfectly inside the 3/8 hose. Pressure tested no leaks.

  

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Took the Gray Ghost 421 out for a romp. It ran great in the cool mountain air somewhere in the George Washington National Forest.

https://youtu.be/Efckn50aqiA?is=FamudEpqvy37Mw1h

I am running Moto-Carrera chambers on my stock ported RD350B with TM32s and Vintage Smoke ignition and it runs really strong. Never had it dynoed but you don't need to port the motor to run them.

Very Cool!!!

Righteous

Re Autolite 4092s.I am hoarding up a bunch since I run them in my H2 and RD. My local Advance is the only place that still has some at their hub. I will be buying more.

Very nice  

Thanks yep it is beautiful here up on the mountain.
It is the standard size Avon. 110/90/18.
The pipes were a challenge. But they did turn out well. See the process here:
https://www.2strokeworld.net/forum/index.php?topic=7657.0

Thanks

75 miles of fun. Ran perfect. I encountered a group of young guys on new Harleys and they all took pictures of the RD. I represented well with a big power wheelie upon departure.

In hybrid form like mine,they can be made to handle and stop. In my case EX 500 Ninja wheels forks and brakes.  Light springs in the throttle and a good aftermarket clutch actuator solves the carpal tunnel issues. Proper setup and good carb synch minimizes vibration and or late model rubber mount motors. But all these mods probably actually hurt the value. That being said I love mine and it will never be sold. But it is the one of my five bikes I ride the least. However nothing quite like the feeling of gassing it up at 5 grand and hanging on tight as it comes up on the pipe.

My 421 RZ is comparable in power and eons ahead handling wise. One day I am gonna get somebody to square off with it against the H2 and see which one is faster. My money is on the Triple but I have been wrong before.