Motor starts hard/ won't shut off

sancheta0624

Recruit
Joined
May 18, 2003
Messages
2
I have a 1979 Johnson 175 that was recently rebuilt when I purchased it. It is very hard to start it takes alot of cranking (5-10 minutes) and it will eventually start. It then blows lots of smoke for 1 min or so then it runs great and it starts great after that. It also has an issue where it will not shut off with the key, I have to choke it to stop. I am at a loss for what it could be. Please help.
 

ob1jeeper

Petty Officer 2nd Class
Joined
Feb 24, 2002
Messages
167
Re: Motor starts hard/ won't shut off

Sanchet...<br />The long cranking time is REALLY draining your battery, not to mention what it is doing to your starter... Sounds like the primer is not enrichening it during cranking... try turning the key to the ignition "on" position, then pushing in, and holding the key in for approx 5-10 seconds before cranking it over. That should give it a primer shot of fuel to get it going, with out the LONG crank times. If that doesn't fix it, get it looked at befor you end up adding a $500 starter to your parts needing replacement list...<br /><br />Typically the reason one continues to run on, after being shut down is that it has developed hot spots in the cylinder that are acting like spark (or in this case glow) plugs. This is typically caused by running a bit too lean, but can also be caused by too sharp of edges in the ports, wrong head gaskets over-hanging into the cylinders, or any small piece of metallic material that could get hot enough to "glow" and cause ignition...<br /><br />I'd start by re-building the carbs (in case they MAY have crud in them, causing some leanness, which for two-strokes is NOT a good thing...), then have the carb sync checked.<br /><br />I'm sure there are other things, but that's where I'd start looking...<br /><br />One final thought, BOTH issues might... a slim chance, but might... be caused by a faulty ign switch...<br /><br />Good Luck, Obiwan...
 

sancheta0624

Recruit
Joined
May 18, 2003
Messages
2
Re: Motor starts hard/ won't shut off

The motor will shut down when choked it is just for some reason the key and kill switch have no effect on shutting it down. Could both issues be related to a bad powerpack? I took the right one off today and the plastic casing is cracked at the top, I am not sure what effect this would have but I am looking for anything here.
 

ob1jeeper

Petty Officer 2nd Class
Joined
Feb 24, 2002
Messages
167
Re: Motor starts hard/ won't shut off

I suppose it might be somehow related to the powerpack, but at this point I dont' have enough experience iwth them to speak eloquently enough.<br /><br />If you've already gone through the carbs, then I'd dig out the old trusty service manual, and start looking at the diagnostics sections for both issues... Then I'd go work on those "possibles" that were COMMON to both problems...<br /><br />I'm still hung up on the carbs, which are at the root of most of the problems you've described...<br /><br />Good Luck, Obiwan...
 
Top