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Well, this isn't going to be super pertinent now, but this is the gasket set I picked up.

https://www.treatland.tv/derbi-GPR-senda-athena-50cc-complete-gasket-set-p/athena-gasket-p400105850050.htm?srsltid=AYCX9vI3NmcYmauHzdww5jZeZqSH1lBXHcLnT-gwBti0UG6a1MkVwk27

I got a 50cc gasket set from treats a handful of years ago for a 75cc Senda. I'll look and see when I get home, but I think the only difference were the head and base gaskets.

For those I'd figure out if there are any performance cylinder kits with a similar 47mm bore, and then see if the gaskets are sold as spares.

It's like a $800 RD and a CS1 for free.

Yamaha RD 350 & 180
https://eauclaire.craigslist.org/mcy/d/arcadia-yamaha-rd/7932820548.html

Cool little bike! Not mine and I've never seen one come up for sale state side. I dig the design of these things, the angled cylinders, "down" draught carbs and 70's styling make for a pretty unique look. But this one seems like it's suffered a bit.

https://spacecoast.craigslist.org/mcy/d/mims-motobecane-125-cc-speed-1972/7916632744.html

https://www.treatland.tv/yamaha-DT-MX-mikuni-VM-intake-p/yamaha-dt-mx-intake-bolt-on.htm

I'm sure there are other places to get them, but this is the DT manifold in question.

I'm curious Mark, now that you have the LS, between the YL, HS, and this, how would you rate them?
Thanks!

That's pretty sweet! Is that the factory 75cc engine? Rare bird if so.

For stubborn studs, if there's access, I like gronking down on the stud in my vice and using the case to get more leverage and torque the stud out.

I love a good Frakenbike, and I love how yours is coming together. Keep up the good work!

Not mine of course. Hard to say if it's worth it, if you'd want to restore it, as I'd imagine finding plastics would be daunting. But it would be fun!

https://losangeles.craigslist.org/ant/mcy/d/clermont-1988-honda-ns125r-ns-125/7826067176.html

It's an astonishing amount of work, and according to google translate, still 90cc.

"This is a modified 2-stroke 90cc para-twin Yamaha HS1. It looks like the cowl is also coming out. 2021 Taste of Tsukuba It was displayed as an OSR-CDI demo car at the autumn Taste of Tsukuba swap meet venue."

Whoa,cool!

Not mine, of course. What a tremendous bike!

https://boston.craigslist.org/bmw/mcy/d/wrentham-1985-harris-performance-uk/7764230141.html

Not mine. Looks like a really nice bike for very little money. Plus 2 spare engines.

https://washingtondc.craigslist.org/mld/mcy/d/silver-spring-1972-r5-yamaha-350cc/7744065768.html

A rare bird. I'm not sure I've ever seen one come up for sale in the north east.

https://newlondon.craigslist.org/mcy/d/pawcatuck-1989-yamaha-tdr-250/7660812491.html