Board index Flathead Power-Technical Questions, Answers, and Suggestions K-Models KR pistons

KR pistons

Moderators: Curt!, Pa

Post Sat Apr 01, 2006 4:41 pm

Posts: 104
Location: VOLUNTEER STATE
Looking for a set of LATE KR pistons('68-'69,with the dome),if not a set of pistons,I would like a set of diagrams/sketches/blueprints. Looking to have several sets made up. STROKER

Post Sat Apr 01, 2006 5:53 pm
xlr

Posts: 149
Location: calif
what dim u need i have pistons

Post Fri Apr 14, 2006 2:51 pm

Posts: 104
Location: VOLUNTEER STATE
XLR,check your private mail,your e-mail isn't working???? What about a phone#??? Also do you have any info on modifying a set of WL heads to run the late KR pistons?????? TIA STROKER

Post Fri Apr 14, 2006 3:58 pm
xlr

Posts: 149
Location: calif
hi 408 848 8935

Post Sat Apr 15, 2006 7:44 am
panic

Just a guess, but the dome height of the late KR is about 7/16", and this may weaken a 45 head too much - not enough metal in the deck.

Post Sat Apr 15, 2006 10:43 am
xlr

Posts: 149
Location: calif
very true. i have done couple set k heads but never 45. should check thickness. maby u could do heads little and for rest make head gasket. obrain told me once lot of work for 3 hp. was manily done for daytona. for top end.

Post Sat Apr 15, 2006 11:02 am
panic

If you have a stroked motor (where chamber volume is small) a spacer could be made like a thick gasket with part of the dome contour in it, and the remainder in the 45 head (#5 = more metal).
One of these days I'll drill right through a #5 in the quench area to see how thick it is; I'd like 3/16" minimum after any mods and that still may not be enough.

Post Sat Apr 15, 2006 11:12 am
xlr

Posts: 149
Location: calif
panic true. say if u have friend with machine shop. u can use drop indactor to measure with out drilling. i made a set of jaws that fit on dial calipers. that i use to check heads.

Post Sat Apr 15, 2006 12:18 pm

Posts: 104
Location: VOLUNTEER STATE
PANIC,thanks for the suggestion;the head gasket=this is a friend of mine's bike,a '41 WLDR. The cases have been replaced,due to a cracked left case,due to cracked flywheels. While we are rebuilding the engine (again) we were wanting to pump some HP into it. Several sets of #6 heads are available to use,came with the bike. XLR,thanks for the info;still trying to e-mail. STROKER

Post Mon Apr 17, 2006 2:14 pm

Posts: 919
Location: RENO,NV. U.S.A.
XR-750'S use cylinder shims under the cylinder to equalize deck height;these could be easily made to fit K/WL,possibly out of 16 ga. sheet metal. Just guessing,you could probably make shims up to .060" thick without effecting manifold fit. This would alleviate some of the cylinder head clearancing as discussed. BREWSKI


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