Just for reference, the YDS5 and YDS6 actually use different cases as the cylinders are not interchangeable. The YDS6 has a wider stud spacing to accommodate the extra port. While most of everything else can interchange, the important stuff doesn’t really making it a different generation…
Your the man jer,you know your stuff 
I see your td1 relisted again today.Did you change your mind?
Brad
Lol! Just trying to keep traffic coming to the site 
BTW, it would be great to see some YDS’s on the track…I might be able to help with YDS3 parts.
Hey Jeremy,
Not disputing your DS6 comment, but the YDS-3 and YDS-5 cylinder base gaskets are the same P/N, so shouldn’t the DS5 cylinders fit on the DS3 cases… which was my suggestion wan’t it?
Ya the DS6 stud spacing was the same as the RD’s up to the RZ, wasn’t it -the “notorious” DS6 cases? But that stuff is all a bit new for me - I faded out around 1976 and by curious coincidence, have the Doobie Bros blasting away in the other room and I think they faded out around the same time. Smell the polyester, touch the platform shoes…
Pat
Hi Pat,
I was only referring to Brads post. DS3 and DS5 are the same. DS6 (last of the vertically split 250’s) is the same architecture as 3 and 5 but different stud spacing. 3, 5 and 6 all look the same. I suspect you are confusing the DS6 and the DS7. The DS7 is the piston-port horizontally-split predecessor to the reed-valve RD350. They were the engines that shared many parts. Brad was talking about retro-fitting DS6 cylinders onto a DS5, which for reasons stated above won’t work.
I hope you ride out that polyester flashback okay!
Right you are about DS7 cases - horizontally split, DS6 vertical split. Not polyester poisoning, more like Pabst overdose LOL.
Anyway, back to P1: get to look at the Kaw 175 next week - I’ll let you know how it turns out.
Pat
Not mine, but the price is right…
Well everybody, checked out the 175 barn job and its too new - a KE175 not a F7.
Oh well.
Pat
Hey Pat,Colin (the man that started this post) has two F7’s.If you talk nice to him
he may let you have one. 
Brad
Hi Colin,
Sent you a couple of emails and a PM - did you get any of them?
Pat.
He doesn’t get on here very often.You will have to be patient.
Brad
Have had my second brush with an F7 - the price is higher than I want to pay, considering I’ll be discarding most of it and… the transmission had so much water in it, the oil had turned milky…
Oh well - there’s still my daughter’s 175 twin if I change a few things on it to make it P1-legal…
Pat
Hello Pat,
Thanks for the email, as Brad said I am rather slow on the forum…( & the track). I have yet to dig out the project as the street Daytona is still on the stand. It should be done in a couple of weeks, then I will see what I can do with the F7. I also got a set of 32 mikunis for my race daytona, does anybody know where I should start with jetting? It has DG pipes, some transfer port work & not much else…the stock carbs ran well at 250 mains.
Cheers, Col
No sweat Colin,
When you dig into the F7 a bit and see what you need, let me know what you feel like discarding. As I said, just a (more or less complete) motor would be a place to start.
Pat.
Here we go…got a mock-up started.
Machining the front hub.
The front end is coming off a Honda enduro. The only change was to remove the F7 stem and weld it into the Honda lower triple.
The swap meet in Barber yielded some goodies
Ya gotta leave the decal on the gas tank Rick.
Pat.
Subtitle: “Pat’s search for a P1-200 Bike is Over…for Now”
Was perilously close to driving up to Arnprior to check out an F7 in pretty rough condition when a project bike presented itself to me this afternoon. The seller and I have come to “an agreement” and if all goes well should have it in my realm Tuesday night.
On the down side, I sold almost all of my racing parts along with an identical bike a couple of years ago and now have to start beating the bushes again for 50+ year-old go-fast parts.
But what the hell, it’ll be another P1-200 bike on the grid, which was of course the object of the exercise, even if the thing will probably be the slowest one out there (especially with me on it LOL).
Wish me luck.
Pat
Hey Pat, Glad to hear you were successful in your quest for a P1 bike.Now the big question.
What did you come up with?
Brad
Progress on the swap meet front wheel
I picked up my wee beauty last night. Carried it down from the guy’s attic and consequently, am taking pain killers for my neck and back today. Engine in a box - ah a seized piston, how lovely! A gas tank so rusty, it sounded like maraccas when I shook it.
How she glistened in the moonlight - her purple metalflake paint job peeling off the frame like a snake shedding its skin and apehanger handlebars so tall, they looked to be longer than the swingarm - but perfect for the tiedowns to hook onto. The pair of yellow spotlights slung low on the front forks was the crowning styling touch - or maybe coup de gras, I dunno. They matched perfectly with the white naugahyde seat cover, which I tore off this morning to find the original Honda seat cover underneath it in great condition. The seat’s probably the best part of the bike and I can’t use it LOL.
No restorer would have touched this bike in a million years, that’s for sure - so it’s perfect to make a race bike from. Needs a rebuild but a lot cheaper than a couple of bikes I was offered and I can probably sell off some of the redundant parts to a restorer. I’m still amazed that just because a bike is old(er), sellers think it’s worth a ton of money, regardless of the condition, but this one fit the budget perfectly.
On another subject, outstanding front wheel Rick. The shouldered Akront wheel I have, looks like it was chewed on by wolverines - but it’s a real Akront, so I guess I better polish the basta up the best I can. I’m using a Yam 350 DLS for mine unless I can find another CB72/77 front brake to keep it in the family.
Right now, my plan is to make the bike look exactly how you would have seen it on the track about 1963.
Wish me luck; I think I’m gonna need it.
Pat