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Author Topic: Won't Go Up and Down  (Read 370 times)

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Offline Phoenix

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Won't Go Up and Down
« on: March 26, 2023, 03:27:30 PM »
Doing a slight rebuild and FINALLY got the cylinder fitted.  Went to cycle it.  ! and 4 are up and 2 and 4 are down.  As I apply pressure, the jugs come up with 2 and 4.  I'm afraid the rings will pop out if the jugs come out too far.  Any idea what to do next without selling it.  Getting frustrated.
Thanks.
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Ed Spengeman
Indy
1971 CB750K1 (Stock)
1973 CB350 Twin  (Gone)

Offline newday777

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Re: Won't Go Up and Down
« Reply #1 on: March 26, 2023, 05:12:43 PM »
You are trying to rotate the crank without the head on and bolted down?
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Stu
Honda Parts manager in the mid 1970s Nashua Honda
My current rides
1975 K5 Planet Blue my summer ride, it was a friend's bike I worked with at the Honda shop in 76, lots of fun to be on it again
1976 K6 Anteres Red rebuilding project, was originally my brother's that I set up from the crate, it'll breath again soon!
Project 750s, 2 K4, 2 K6, 1 K8
2008 GL1800 my daily ride and cross country runner

Prior bikes....
1972 Suzuki GT380 I had charge of it for a year in 1973 while my friend was deployed and learned to love street riding....
New CB450 K7 after my friend returned...
New CB750 K5 Planet Blue, demise by ex cousin in law at 9,000 miles...
New CB750 K6 Anteres Red, to replace the totaled K5, I sold this K6 at 45k in 1983, I had heavily modified it, many great memories on it and have missed it greatly.....
1983 GL1100A, 1999 GL1500 SE, 1999 GL1500A

Offline bryanj

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Re: Won't Go Up and Down
« Reply #2 on: March 26, 2023, 05:33:02 PM »
Lets assume you an 2 and 3, were they the last pistons you fitted? If so you have possibly trapped an oil ring scraper thin piece
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Offline ekpent

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Re: Won't Go Up and Down
« Reply #3 on: March 26, 2023, 05:47:38 PM »
Sounds like a good suggestion Bryan, may be a piston binding.
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Offline HondaMan

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Re: Won't Go Up and Down
« Reply #4 on: March 26, 2023, 07:35:13 PM »
+3. Sounds like a snagged oil ring.
:(
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