A friend of mine purchased a 2000 Johnson 175 60 degree looper (carbed) that we just can't seem to get running. It will run if we force it to by giving quite a bit of throttle, but won't idle. One of the main things to note is that the motor pushes air out of rather than sucking air in the top two cylinders. Both top cylinders run hot compared to the rest of the block. I would guess this is either a vacuum leak or reeds . However, seems odd that the top reeds on different banks would go at the same time (backfire???) Also, the retired omc mechanic that did the first carb rebuild said he had the starboard throttle body off and said the reeds looked good (not sure if he actually removed them though)
Things that I have checked so far. Compression good, aprox 95psi per cylinder, cleand carbs (took off) & throttle body left on, but did confirm idle circuit was clear on all starboard cylinders, cleaned float bowls resurfaced to remove warp, Lync and sunc set as per manual & timing set on specs of idle at 6 atdc, and hs 20 btdc, all colis/cylinders spark, isolated out rectifier, isolated out quick start, and a few other things which I am sure I forgot. I adopted this and did what is listed in this paragraph as the mechanic "gave up on it".
Please help!!
Thanks
Things that I have checked so far. Compression good, aprox 95psi per cylinder, cleand carbs (took off) & throttle body left on, but did confirm idle circuit was clear on all starboard cylinders, cleaned float bowls resurfaced to remove warp, Lync and sunc set as per manual & timing set on specs of idle at 6 atdc, and hs 20 btdc, all colis/cylinders spark, isolated out rectifier, isolated out quick start, and a few other things which I am sure I forgot. I adopted this and did what is listed in this paragraph as the mechanic "gave up on it".
Please help!!
Thanks