Yamaha HS1, 90cc twin crankshaft disassembly. 

Thanks, buddy, I get a lot of tips from my viewers too. Much appreciated.

Hi Ron, I got the piston and rings for mine from Speed and Sport in Pennsylvania, google them and call. Don't call the one in California, not the same.

No problem, Peter, yes there could have been some real problems for sure.

Thanks John, it's fun making the tools, and when they work.....its gravy! Yes, I think they were advanced for their time, bet they sold a ton of those YL1's, just because they were a twin. Nothing like the smell of bean oil, I mix it in my Lawn boy fuel so I can have the memories while I mow the grass. LOL

Hey Chris, not sure about the story, it has been years since I read anything about either of them. I'm sure the race bikes were a derivative of the street model with a lot of black magic thrown in for good measure. Oh, those were the times.

Hey Richard, sure appreciate the kind words my friend. Sorry about the audio on this one. Not sure what happened.

Thanks Ron, I will let you know what I think of the Namura rods when I get it.

It sure is Jim, very cool.

Yeah I will find another someday.

Yes I forget about my phone camera at times, I have been using it more for stills to include lately.

Wow broke your tool on that B175! Want to see what you come up with. Sounds like yours was worse than mine.... how can that be, must be that British salt air.

@@montana2strokeracer it was sitting with a full crankcase of water since 1977, so perhaps it's forgiven! Milling the new tool is proving to be hard work.

Oh boy, how are the cases? That water sure pits the aluminum.

@@montana2strokeracer I can't save the cases unfortunately. They are terrible. We have located a good used set.

Yes it could be used but will require hours of machine work.

You mean like brake shoes, normally from Ebay.

Hey Rich, not real sure what your question is here. Think you are wondering if the rod weight is critical. No not really, most of the replacement rods weigh less than the OEM ones. I have never noticed any vibration or noise associated with using them. Maybe if it was ultra hi rpm use but have never noticed anything with the old motocross or flat track machines that I have done.

@@montana2strokeracer Hi Dale, sorry for not being clear. I've watched engine balancing, and to match the rods they weighed the large end while the smaller end was supported. I wondered if one of the new rods (even though the entire rod weighed less) weighed the same on the crank end.

Hey Rich, Oh I see, I know that's how it's done, messing around with cars for all these years, but I don't get that involved with it. If it's a replacement part, then I use it. Like I said I have never run into a situation where it was too out of wack and caused vibration or other issues. That is just more than I want to mess with, above my pay grade as they say. Maybe the next time I do one I will experiment and see what come from it.

Hey Frank, waking up to 63 degrees here in the big sky, supposed to be 80 today. Good day for a ride......you want to come along?

@@montana2strokeracer OH! yeah crank them up, i would like to ride your Yamaha 360 flat tracker first, than a old favorite the Pursang.

No worries Dale, some refreshments still left.