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b77 35 johnson no spark

J

jsb91010

Member
"i have no spark in either plu

"i have no spark in either plug on my engine. It ran just fine yesterday no problems at all. I went to start it tonight and it fired over, ran for a second then died...after that i tried restarting and it just cranks and cranks, but no fire. Any ideas? I pulled the plugs and i didn't see a spark. I also disconnected the black/yellow wires to make sure it wasn't the killswitch."
 
"the most common problem,is a

"the most common problem,is a bad pwr pack...ck plug-in conn for continuity,corrosion etc..
if u have a key sw,turn it on,and ck for voltage on blk/yell wire,it would blow a new pack.."
 
"35el77C is the model number..

"35el77C is the model number....also...im not sure what you mean by check black/yellow and it would blow a new pack? right now the black/yellow is still disconnected. are you saying to check to see if with key on it has voltage? if so, that's bad?"
 
"correct....w/key on.if u have

"correct....w/key on.if u have any voltage,on blk/yell wire ,then u repl key sw,and pack."
 
ok...I didn't see any volt

ok...I didn't see any voltage on that wire with the key on...Still thinking it's the power pack? I am going to buy one tommorow when the shops are open! Thanks
 
"ok guys...just recieved new p

"ok guys...just recieved new power pack in the mail and installed it...STILL NO spark on either plug
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any ideas?!?!?"
 
"make sure u have any,and all

"make sure u have any,and all kill switches,ign key etc,disc fr system.do you have a kill button on fr of eng,make sure its disc and try....if u have done all that,..your prob would presumably,be under the flywheel...a service manual sure couuld help you.another thought,is to pull the flywheel and ck things for,rubbing on flywheel,loose items,..wires rubbed raw,shorting out,..pull stator plate,turn upside down,ck wires where they r clamped..."
 
"WOW...i feel like an idiot...

"WOW...i feel like an idiot...i think i bought the power pack for no reason like you said "just buying parts" ...oh well live and learn...I retunred with a new spark tester, and multi meter ...I tested my plugs this time touching them to the head like you guys said and I have nice blue spark on both plugs!!! The engine still will not start. I also re-disconnected the black/yellow wire still no start. In regards to the black/yellow wire...I bought my control box seperate from engine and when I did I just cut the harness from engine, and spliced it with wires from control box...when i say I disconnected black/yellow wire I simply undid the splice. Is that sufficient??? Where do i start now guys?"
 
"if ur plugs are firing,then,u

"if ur plugs are firing,then,u must make sure u r getting fuel,...by cleaning,cking hs jet,and inst new carb kit."
 
"I had just cleaned carbs like

"I had just cleaned carbs like one month ago and the boat ran fine, of course until this incident. I am thinking I should mix a fuel mix and try spraying that into carb while cranking? Will that tell me if it's a fuel issue? I do know that when removing the plugs after trying to start I can see they have a little gas on them and I can smell it. Does that mean im getting fuel? Thanks for your help."
 
"yep,...test your spark,to see

"yep,...test your spark,to see that u get AT LEAST a 1/4 gap of blue...spark...it may be very weak.."
 
"do u have elect start....if s

"do u have elect start....if so,...put it on full choke,in water,or flushette,...and crank it good,then dont ck,and crank."
 
"i had the plugs gapped to rig

"i had the plugs gapped to right under .040 and on both i got a nice blue spark. It appeared like a good spark. It was definetly noticable, wasn't hard to see or anything..."
 
"what jwb means by a gap is te

"what jwb means by a gap is testing how strong the spark is by watching it jump without the plug on the wire,they sell testers for this .
if you choose not to buy one it can be a challenge, first try a screw driver,insert it into the plug wire and hold it about 1/4 of an inch away from the head(ground),you may also need
a remote to engage the starter ,then watch for spark ,.note intencity weak strong and try not to get a zap it might hurt ,until you can think fast enough to stop cranking(been there done that)"
 
"I have tried new plugs...I re

"I have tried new plugs...I rechecked compression again it's 120 on both cylinders...I am also using a spark tester to test spark, and see spark on both plugs..A nice blue spark...I'd say it's a strong spark...very noticable, and on both the spark looks the same...
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"
 
if you have 120 on both cylind

if you have 120 on both cylinders and good spark and getting gas something is surppose to happen. unless you have sheard the key that hold the flywheel in place.
 
"how could i tell oscar?!?! Th

"how could i tell oscar?!?! The flywheel does engage with the starter and all appears to spin fast and good...
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"
 
"you would have to pull the fl

"you would have to pull the flywheel,it would be like a half moon key that holds the flywheel so it would be in time when you tighten up the big nut on top of the flywheel.the easy way is to take out the top spark plug and get the piston to the top of the cyl you can do this by turning the motor by hand and using a inkpen stuck in the spark plug hole when the piston is at the top your timing mark should be pointing at the numbers on the flywheel.
but i'm just a backyard shadetree"
 
"good point,..however,....it w

"good point,..however,....it would at least backfire.....if other items were good...........
have u ck'ed for water in fuel..."
 
"pull the drain plug,on bottom

"pull the drain plug,on bottom of carb,ck'ing for fuel.....make sure choke is closing all the way...ck for spark,exactly as it sits,..dont disc anything this time,as u may have some wires bass ackwards that is killing spark."
 
"yeah..it doesn't backfire

"yeah..it doesn't backfire or anything like that...doesn't even sound like it wants to fire...I don't know how water would have gotten in my tank it's an external and it's been closed? The gas inside looks normal? The choke is closing all the way with both elec. and manual choke. I am getting spark with black/yellow and without black/yellow connected. I am 100% sure I got spot yesterday on both plugs, no doubt. I am drying out a spray bottle right now im going to try spraying a fuel mix into the carb...I don't really know what else to do if that doesn't work. Probably check the flywheel key?"
 
i tried spraying the fuel mix

i tried spraying the fuel mix into the carb with no luck. I am asking around online trying to see if anyone in my town can come by and help me. I think my next step is removing the flywheel and going from there...
 
"well you have good spark, goo

"well you have good spark, good comp, and you know when you spray premix in the carb that you are getting fuel.

i wouldnt pull the flywheel until i was almost certain the key is sheered............if you do youll HAVE TO have a torque wrench because if you dont torque it properly youll sure enough need to replace the key for the flywheel.

i would pull the plugs and put an ink pen/pencil in the cyl--turn the flywheel by hand till the pencil comes all the way out as far as it will go and just as it starts to go back in check to see if the timing mark is close to lining up with 0 degreese........if it isnt even close your key or crankshaft is broken.

if it is ok i would make for sure you havent accidentally mixed up the sparkplug wires and put them on the wrong plugs...........im not trying to insult you---believe me ive seen very experienced mechs make simpler mistakes.....i fiddled with one of mine for over an hour ,sitting at the dock in the water, before i realized i had water in my gas------and it is a pull start.

you might even try hooking up a timing light to see if you are still geting spark during start up.

you also have to have a good battery that will spin your motor at least 300rpms----or you wont get any spark on a lot of models."
 
"I do have a torque wrench if

"I do have a torque wrench if need be...I did try the pencil in the cylinder and IM not too sure what I'm looking for? I got the cylinder all the way to top where the pencil almost falls out, but I don't see anywhere to lign up 0*'s or anything? Where am I looking? I do see 2 sets of #'s on the top of the flywheel in incriments of 4 or something but no number 0 and I don't see where they are supposed to line up with. HOpe i made sense. thanks!"
 
On some models it is on the to

On some models it is on the top of the starter bracket if yours has the little arm sticking up off the strater bracket and you have the piston at the top the number 8 will be right in front of the little arm sticking up.if you don't have nothing to line it with the numbers should be right over the top of the carburator.that would be the frist set of numbers turning the motor clockwise. and i hope i'm making sense too!!
 
I just pulled up a picture of

I just pulled up a picture of your starter bracket and it will have the little arm sticking up off the starter bracket. line it up with the number 8 on your flywheel and your piston should be at the top.
 
oscar...i did that and it DOES

oscar...i did that and it DOES line up...i checked the top cylinder and it lined up with the 8 exactly...what does the bottom plug line up with? 8 also? Thanks...
 
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