One Mans Junk.... '72 CS5E (RD200) Build.

WideAWAKE

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Have to wonder if you could really get $6,500 of that bike if I would have been better off buying a couple when new and then store them in a nice dry place if I would have done better than playing the stock market? $1,000 for a head for a 2-stroke? I recall the guy I bought my RD400 off used told me about someone who had a "Gold Head" to fit it. Forget the asking price back then but know it was no where near $1,000!

Can’t tell from the pic, but if that’s a 250 or 350… where I live 6500 would be a average price, maybe even a great deal depending on the build.

They collect big bucks in California.
 

willis

xsive compulsive disorder
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It’s a 350. I cleaned up the fuzzy pic.
1FA1A6E1-DF1C-431A-A6DD-B5CB84F960BA.jpeg
 

Jim

Beyond the edge is the unknown. Here be Dragons
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So I think I got lucky with the motor. Book says rocking at the con rod little end should be 2mm or less. Got a half on one and a mm on the other. Center crank seal is of the labyrinth variety, so should be just fine. Just need to replace the end seals.
Looks like it was bored a half a mm over and never run.... good thing too.


RD200 pistons..png





Cylinders still have the crosshatch from honing.... light surface rust that will clean up easy....



1656986150061.png




So here's why I said luckily never run. Any 2 stroke aficionados out there?




1656986290333.png
 

WideAWAKE

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So I think I got lucky with the motor. Book says rocking at the con rod little end should be 2mm or less. Got a half on one and a mm on the other. Center crank seal is of the labyrinth variety, so should be just fine. Just need to replace the end seals.
Looks like it was bored a half a mm over and never run.... good thing too.


View attachment 218112




Cylinders still have the crosshatch from honing.... light surface rust that will clean up easy....



View attachment 218113



So here's why I said luckily never run. Any 2 stroke aficionados out there?




View attachment 218114

I never understand why 4 strokes don’t use pins.

I’ve had a bike that started with staggered rings, align themselves and then smoke.

Pins just seem like a smart thing to do.
 

WideAWAKE

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I will bite, I dont see any champher or relief on the ports.

WideAwake the pins are to stop the rings turning and catching in the ports you can imagine the scenario.

Yes, that I know as I’ve owned my fair share 2 strokes.

But, on a 4 stroke, your staggered rings can move, seems pins would be a very easy fix for that.
 

AUTOMAN

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Rings line up every once in a while, happens all of the time.
Staggering keeps the initial ring/bore break-in from wearing unevenly.
After 10-15 minutes it does not matter.
Easy "fix" for what?
 
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