compression / depression
compression / depression
Rebuilt my 1982 xl1000 with new crank, bored out jugs to 50 over with new pistons and had new valves and guides put in, But only get 50lbs of compression in both cyclinders, Why?
Rehoned cyclinders, new rings agin. checked timing agin, installed new gasket set agin, still same compression problem, and no one seems to have any good answer as to why.
Outstanding HDF Member
Joined: Feb 2009
Posts: 2,551
Likes: 22
From: Jacksonville Beach, FL.
Extreme HDF Member
Joined: Nov 2006
Posts: 13,702
Likes: 38
From: Houston area
two posts 4 minutes apart? did you put the heads back on?
You might try reposting in a tech section where it is more likely to have a good wrencher see the post. If you put the heads back on....right size pistons... then it pretty well narrows it to valve timing...or pushrods are not correct length holding valves open but that seems unlikely if engine turns ok....maybe a search would turn up some good suggestions...
You might try reposting in a tech section where it is more likely to have a good wrencher see the post. If you put the heads back on....right size pistons... then it pretty well narrows it to valve timing...or pushrods are not correct length holding valves open but that seems unlikely if engine turns ok....maybe a search would turn up some good suggestions...
Last edited by flibuoy; Aug 30, 2009 at 08:02 AM.
Seasoned HDF Member
Joined: Apr 2006
Posts: 10,675
Likes: 95
From: Billings,Mt.
I would check the cam timing also.
You could also remove the valve covers to see if the the valves are closed at TDC.
You could also remove the valve covers to see if the the valves are closed at TDC.
Trending Topics
Seasoned HDF Member
Joined: Dec 2008
Posts: 19,735
Likes: 1,178
From: Jamestown, CA
HD Forum Stories
The Best of Harley-Davidson for Lifelong Riders
8 Best Harley-Davidson Motorcycles Ever
Pouria Savadkouei
10 Worst Harley-Davidson Motorcycles Ever
Pouria Savadkouei
Killer Custom's Jail Break Is The Breakout That Refused to Blend In
Verdad Gallardo
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Verdad Gallardo
Harley-Davidson Reveals Super Cool Cafe Racer Concept
Verdad Gallardo
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Verdad Gallardo
10 Motorcycles You Should Never Buy
Joe Kucinski
10 Things Harley-Davidson Needs to Fix in 2026
Verdad Gallardo
Southpaw Super Glide: A Left-Hand-Drive 1979 Harley FXE Built to Fit the Rider
Verdad Gallardo
Thread
Thread Starter
Forum
Replies
Last Post