help!!! 20 hp johnson 67-69?? no id tag how to set points

[grimlen20]

Hello all i recentally bought a 75 crosby sled and it came with a 20 hp johnson 550$ well changed the coil out at a shop and new wires. got her running was running pretty good with a slight miss. but then i shered the fly whell key and threw my points out need help getting her back in timing got good spark off both plugs had her running but keeps throwin out of timing do i set the gap by the top plate on fly wheel or wot? or idle or do where too set the gaps at what pos? any help at all would be great would love too her running smooth was tonight for bout 5 min ? then quit :/

 

[tx1961whaler]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

http://forums.iboats.com/showthread.php?t=294072

 

[sheboyganjohn]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

First off if you sheared the flywheel key, you most likely did not have the flywheel torked down to the proper setting. I do not know what the spec is for your motor, I am sure someone else will pipe in with the proper ft/lb for it.

To set the points gap, there should be a mark on the cam on the top of the crank. Rotate the crank until that mark is centered on the point arm. Then adjust the points to 0.020" with a feeler gauge. Moving the plate only advances or retards the timing, it has nothing to do with the gap on the points. You might want to search around and find a factory manual for your motor. They can usually be found on E-bay for around $20. If you post up a pick of the motor, someone on here might be able to tell you the year, or year span which will help you get the correct manual.

Also check out the top secret file at the top of the page (it is a sticky). Lots of good info in there.

 

[grimlen20]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

thanx for your info well the guy at the shop apperentaly didint tourk it proplerly pluss i notoiced there was a small bit of rust behind where the key was in terms meaning it was cracked and he faild too look at it. which agvragets me also e clips were missing holding on the points from riding up.... i will not take back too him. 160$ for his fail. but thanks for the info and help i wasnt for shur if i was too adjust too where the top cylender was allthe way out and then gap first point and then too other. thanx again i am new too the boating thing. i am a youngun... 23 the 14th was my b day so yester day...lol thanx for help

 

[grimlen20]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

let me reqoute on that rust was on the key itself not behind. what i had left of the key*

 

[tashasdaddy]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

read the TOP SECRET FILE, 1st thread in this forum. good info there for you. happy birthday.

 

[grimlen20]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

thanx for all the help i finaly found the sweet spot on the points i was trying too adjust the point in the wrong spot i found out by trial and erra that i need too set gap with the key alighen too the end of the top point arm and it fired up and ran beautifull!!!!!! now but me being forgetfull forgot too tighten the nut all the way and sheered the new pin am off tomorrow too put in a new key and should have no more problems!!!!!! thanx everybody for all the responces
john

 

[samo_ott]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

Good thing those keys are cheap! I think your engine's flywheel nut is around 50 foot lbs, but make sure this time...

 

[56 rude]

Re: help!!! 20 hp johnson 67-69?? no id tag how to set points

are the coils under the flywheel?if so ,another common error is to misalign the coils and when you pull start it you will shear off a key because your hitting the coil with the flywheel.