79 FLH-80 Compression and Timing Questions
Thread Starter
|
Tourer
Joined: Oct 2016
Posts: 256
Likes: 36
From: Hartford, CT
79 FLH-80 Compression and Timing Questions
As mentioned in earlier posts, this is non-runner I bought at the end of the summer that hasn't run in awhile.
I recently got the bike running after fixing starter system and installing new Dyna S ignition. I set the timing statically with a test light. I bought the long clear timing plug and I'm still not able to see the the mark with my inductive timing light.
I'm running an older S&S Super E that I removed, cleaned, and added a rebuild kit.
After letting the bike warm up for a few minutes, I noticed the exhaust was hotter coming out of the front cylinder exhaust pipe vs the rear. I hit both pipes with my temp gun and the front was considerably hotter than the rear. Both plugs are getting spark and I did a compression test 100 psi front and 95 psi in the back (without WOT - I forgot).
Rear plug looks too clean. Could the rear cylinder be getting too much fuel? Maybe timing is still off?
Thoughts and input please.
Thanks!
I recently got the bike running after fixing starter system and installing new Dyna S ignition. I set the timing statically with a test light. I bought the long clear timing plug and I'm still not able to see the the mark with my inductive timing light.
I'm running an older S&S Super E that I removed, cleaned, and added a rebuild kit.
After letting the bike warm up for a few minutes, I noticed the exhaust was hotter coming out of the front cylinder exhaust pipe vs the rear. I hit both pipes with my temp gun and the front was considerably hotter than the rear. Both plugs are getting spark and I did a compression test 100 psi front and 95 psi in the back (without WOT - I forgot).
Rear plug looks too clean. Could the rear cylinder be getting too much fuel? Maybe timing is still off?
Thoughts and input please.
Thanks!
Seasoned HDF Member
Joined: Nov 2006
Posts: 12,878
Likes: 5,449
From: la la land jerzey
timing with a dyna and a centrifugal set up - put the advance mark in the hole favor to the rear just a bit ( looking for a little retard ) turn the rotor in the direction it advances in and just at the stop point the light should go on - that done check for an intake leak WAY common in a o ring manifold even if everything is new ,
now i dont know what you actually did to confirm the front is hotter but the front is hotter as the flywheels are sending oil directly up the rear cylinder, and not as much in the front by the 45 degrees design - look at the engine and think about the wheels turning counterclockwise from the left side
now i dont know what you actually did to confirm the front is hotter but the front is hotter as the flywheels are sending oil directly up the rear cylinder, and not as much in the front by the 45 degrees design - look at the engine and think about the wheels turning counterclockwise from the left side
Thread Starter
|
Tourer
Joined: Oct 2016
Posts: 256
Likes: 36
From: Hartford, CT
Thanks John.
The bike and working on shovels is new to me so I don't have a real reference point for how they run. I used an I/R thermometer and pointed it at the pipe near the cylinder head. There was around 100 degree difference.
I'll look at the timing again, check for intake leaks when its running, and try the 295/70 jets you mentioned in my other post.
The bike and working on shovels is new to me so I don't have a real reference point for how they run. I used an I/R thermometer and pointed it at the pipe near the cylinder head. There was around 100 degree difference.
I'll look at the timing again, check for intake leaks when its running, and try the 295/70 jets you mentioned in my other post.
Last edited by Nick Sorgio; Dec 15, 2016 at 06:55 AM.
Road Warrior
Joined: Jul 2016
Posts: 1,370
Likes: 439
From: va
AS said before me on the intake leaks -- do check the manifold to spacer to carb flatness on a piece of glass as they were warped on my '80 -- I made a plate that replaced the carb and aired it up then used soapy water , check out on UTube video for intake leaks -- a sweet setup
Seasoned HDF Member
Joined: Apr 2010
Posts: 9,576
Likes: 7,953
From: Long Island, New York
Do what John says, end of sentence.
But also keep in mind you are running an air cooled motorcycle in a stationary position. I would set up a fan in front of the bike to help regulate temps and try to have better real world conditions.
Last, intake leaks can cause lots of problems, check that out.
But also keep in mind you are running an air cooled motorcycle in a stationary position. I would set up a fan in front of the bike to help regulate temps and try to have better real world conditions.
Last, intake leaks can cause lots of problems, check that out.
Thread
Thread Starter
Forum
Replies
Last Post
