« previous next »
Pages: [1]   Go Down

Author Topic: Bike wont turn over all of a sudden..  (Read 1469 times)

0 Members and 1 Guest are viewing this topic.

Offline Burke

  • Hot Shot
  • ***
  • Posts: 469
Bike wont turn over all of a sudden..
« on: March 04, 2018, 12:11:09 PM »
Long time since I have been around but I'm back.
Recently found a 77 CB750 and brought it home. I was giving it a once over and turning it over using the kick starter (wanted to check compression with my gauge)then all of a sudden it seemed to freeze up.

I'm not sure if a freely turning engine would seize just by using the kick starter, or if it is just compression lock?

Any ideas?
Logged

Offline Trav-i

  • Has finally become an
  • Expert
  • ****
  • Posts: 930
Re: Bike wont turn over all of a sudden..
« Reply #1 on: March 04, 2018, 12:40:38 PM »
The safest way to manually turn the engine over is to take the alternator cover off and use the bolt in the end of the crank.  Try to turn it clockwise which is normal rotation, if it will not turn DO NOT FORCE IT.  See if it will turn back counterclockwise, if it will then you will need to investigate the cause.  It may be a simple fix, or might require you to pull the engine to find the issue.
Logged
Forum member #9962

I don't know a lot about anything, but I know a little about practically everthing. 

If your not first, your last - Ricky Bobby

1992 GL1500 Interstate

73 CB750 Bobber Project (Always an on going project) Sold
71 CL350 Scrambler Project (Done and riding it) Sold
78 CB750 F3 Super Sport with F 0 engine (Current project)

Offline ekpent

  • Really Old Timer ...
  • *******
  • Posts: 13,508
  • To many bikes-but lookin' for more
Re: Bike wont turn over all of a sudden..
« Reply #2 on: March 04, 2018, 01:06:57 PM »
 Did the engine turn over a few times before it 'froze' or did it stop turning on the first stroke of the kick lever. If so then you could have fuel or something in one of the cylinders. Might want to at least pull the spark plugs before trying anymore.
Logged

Offline robvangulik

  • Honda Fourever
  • Expert
  • ****
  • Posts: 1,418
Re: Bike wont turn over all of a sudden..
« Reply #3 on: March 04, 2018, 01:19:24 PM »
Quote from: Trav-i on March 04, 2018, 12:40:38 PM
The safest way to manually turn the engine over is to take the alternator cover off and use the bolt in the end of the crank.  Try to turn it clockwise which is normal rotation, if it will not turn DO NOT FORCE IT.  See if it will turn back counterclockwise, if it will then you will need to investigate the cause.  It may be a simple fix, or might require you to pull the engine to find the issue.
From the alternator side counterclockwise is the normal rotation.........(or your clocks may run different from mine  ;D )
Logged

Offline Burke

  • Hot Shot
  • ***
  • Posts: 469
Re: Bike wont turn over all of a sudden..
« Reply #4 on: March 04, 2018, 01:20:15 PM »
Yes it turned over several times before it stopped.
Logged

Offline Flyin900

  • Expert
  • ****
  • Posts: 1,032
Re: Bike wont turn over all of a sudden..
« Reply #5 on: March 04, 2018, 04:17:37 PM »
Pull all the spark plugs first to ensure there isn't any gas or water in the cylinders causing hydro lock and potential damage. Then turn it over by hand as suggested to see that the motor is free.
If it is stuck then further investigation will be needed.

On a bike that you have no real history or that has sat for sometime it is good to pull the plugs and spray all the cylinders with fogging oil or deep creep. Let this soak for awhile and turn the motor over by hand.
Any stuck rings or rusted cylinders will have an opportunity to free up and be lubricated before you are running pistons up and down a dry bore.
« Last Edit: March 04, 2018, 04:23:43 PM by Flyin900 »
Logged
Common sense.....isn't so common!

1966 CL77 - 305cc - Gentleman's Scrambler
1967 CL175K0 - Scrambler #802 engine
1972 CB350F - Candy Bacchus Olive - Super Sport
1973 CB350F - Flake Matador Red - Super Sport
1975 CB400F - Parakeet Yellow - Super Sport
1976 CB400F - Varnish Blue - Super Sport
1976 GL1000 - Goldwing Standard
1978 CB550K - Super Sport
1981 GL1100 - Goldwing Standard
1982 CM450A - Hondamatic
1982 CB900C - Custom
1983 CX650E - Eurosport
1983 CB1000C - Custom X 2 Bikes now - both restored
1983 CB1100F - Super Sport - Pristine example
1984 GL1200 - Goldwing Standard

Offline Burke

  • Hot Shot
  • ***
  • Posts: 469
Re: Bike wont turn over all of a sudden..
« Reply #6 on: March 05, 2018, 03:30:16 PM »
Pulled the plugs added some MMO and then took the alt cover off, and it turned over that way, then the kick was able to move after that as well.

Thanks guys, its been awhile since I have worked on one of these guys and it brought back some memories.
Logged

Offline Burke

  • Hot Shot
  • ***
  • Posts: 469
Re: Bike wont turn over all of a sudden..
« Reply #7 on: March 05, 2018, 03:53:23 PM »
I didn't get that far, but the oil that came out when I tool the alt cover off was pretty bad. Had that oil/gas smell.

I have moved (married divorced and re-married, had kids..) since I last worked on bikes so I plan on setting up my garage a bit better this weekend so I can really get into it.
Logged
Pages: [1]   Go Up
« previous next »