What is standard bore for a 1978 KTM 400. Thnaks.
Ron Carbaugh
My memory says 82mm with the early 400 in 75 being 81mm. If I am right do I win a prize, Brother?:D
Larry P
Larry,
You are telling me what I want to hear....I thought it was 81 on the early ones and then it went to 82. We will see what the experts say. Thanks for your post. I hope to see you on the way to the Reunion Ride little Brother.
Ron Carbaugh
Larry's the winner. The 1978 400's bore and stroke is 82 x 68mm. Before that, 400's were 81 x 69mm. The '78's stock piston is the same size as a previous 400's fourth-oversize piston.
Ron, Is this for a cart engine ?
;)
Bob
Rob,
Once again, you've beaten me to the punch. The info I have for the '78 400 is......now get this:
Enduro-355cc bore 81/stroke 69
MC-359cc bore 82/stroke 68
Short answer...........82.
GO PENTON!
Dave Withrow
Thnaks everyone for taking the time to help an ole Sachs guy. Rob...this will g in a Kenny Roberts Flat Tracker that is currently a 250. Thanks again.
Ron Carbaugh
Now I understand why those Texas guys are always so fast !! Looks like they might be disguising 400's in the 250 class. :D Now why didn't I think of that !! Just kidding Ron !!
Dave McC
I thought the 250 class went from 250cc to 399cc?? Am I missing something here? Where is that Larry Perkins....he told me that was how the class was determined.[:o)]
Ron Carbaugh
Secrets? I know nothing. I see nothing. Class? I was late for that.[8D]
Larry P