Re: More 135 Johnson problems

[wiscoboater]

Thank you rickrodt.
Compression is 154 on #1, 150 on #2, 149 on #3 and 151 on #4.
I replaced all 4 coils due to all of them being cracked. They were working, but it was just a matter of time before failure.
When I rebuilt the carbs today I found them to be very dirty inside. Lots of crud in the upper carb bowl, and one idle circuit blocked completely in the lower carb. Upper needle and seat was very worn as well. Taking out the welch plugs on the idle circuits showed some dirt in there as well.
Not having the proper tool for jet removal I blasted the high speed jets with OMC power tune and 15lbs psi compressed air and gently cleaned with a pipe cleaner. When done I soaked entire carb body in carb dip.
The idle jets I blasted out with power tune and compressed air until they flowed like new. Re assembled with the new kits and floats and test fired.
The motor is running and idling beautiful. It’s like it’s not the same motor. Throttle response is instantaneous and it comes back down with no stumbling or popping. The idle is smooth and even with no more surging. I can’t get it idle below 1200RPM right now so I’ll have to re adjust the cables again and see if I can remedy that.
When I fired it today it was with the UL77V surface gap plugs. I was told by a few members not to use them due to fouling issues. Before that I was using NGK B7HS-10 standard electrode type plugs. They both seem to run about the same, as in I can not tell a difference swapping one for the other.
The stock timing spec for this motor is 20 degrees. I currently have the timing at 18 degrees set at 4200RPM. I was told to back 2 degrees of timing out of it due to the melted piston dome issue this motor sometimes has.
So I guess another lake test is in order to see the final results of the days work. Hopefully I am getting this going in the right direction.