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Just got back after a quick run of 30 miles, happy to report it's running fine sans a dead spot from 3.5 to 4.5k rpm which is jetting issue as I understand.

Agreed, these are too old now to be trusted for long trips and stuff. I'm gonna keep an eye on CDI too and perhaps plan a budget for it.

I don't do more than 50 mile trips around town so I will see how long before it dies out.

Thanks guys for all the quick responses.

I put back everything together and magically it fires up. It's still baffling to not know what went wrong although I don't see any wires pinched or anything. For now it works but I will soon need one just due to it's age.

I was fiddling around jetting on my 85 RZ350 and removed the snorkel & air-duct partition in the stock airbox when I suddenly lost spark. It may very well be that the old ignition coil gave up although I'm yet to get conclusive result. However, I wanted to see the consensus on what a good replacement is since original is NLA.

Economy Cycle has Dynatek:
https://www.economycycle.com/product/dynatek-ignition-coil-kit-yamaha-rz350/

Yambits has a cheaper plug-n-play:
https://yambits.co.uk/rz350n-ignition-coil-p-104803.html

TIA!

Hate to admit but I'm jealous. You found a absolute treasure(s). These are the best ones you can lay hands on, nothing more pleasure than hitting 7k and you feel getting launched. I semi-restored one few years ago and that was fun. Be prepared to spend quite a handful for the parts are expensive.

Should you need anything, check this out:
https://alexmichrg500.wixsite.com/rgshop

Good luck and keep us posted.

Sounds like that dude spends too much time around cows, and not enough time around people.

Or maybe vice-versa.

Indeed a strange encounter but as stated above you did handle it sensibly. These days everyone seems to be on edge so I do try to keep distance. Divorces, loss of jobs, just a bad day .... who knows what else.

Thanks for explanation, I'll post back what comes of it.

So oil seal gone bad? My apologies but if you can translate it to much simpler terms would help.

Thanks for the FAST responses. I removed the cylinder head to replace the gasket and now see right cylinder has oil in it, the left is dry. What could be the problem?

Hi guys!
So I have freshly built motor with new Wiseco pistons and just got a chance to start my RZ as the weather is warming up a bit here.

The coolant starts leaking from cylinder head likely due to a banshee gasket installed which I'll be replacing. But the main concern is the coolant seeping from the bottom from the engine bolts. I couldn't find any source. Any pointers will be much appreciated. Thanks a lot.

That is quite a deal. I have same on my RZ.
For reference, see (not mine) - https://iconicmotorbikeauctions.com/auction/1984-yamaha-rz350-5/
 

Nice! That off-white paint scheme looks neat. Southern Colorado?

Never got sold (kinda expected for the asking price). As someone noted this was 2-3k worth with amount of work needed.   

Not mine:
https://www.ebay.com/itm/317856679951

My buddy has got same issue on his RD400, we need to check on the neutral gasket switch.

Btw, that glass window for clutch looks neat.