77 70hp low rpm problems

[Forgotten]

Last week my motor started running kinda cruddy. It sounds like its picking up a cylinder every now and then. It pretty much just does it below 2000 rpms. I thought I had some bad gas, but that doesnt seem to be the case. Ive changed gas, replaced the plugs, cleaned the carb bowls and sprayed carb cleaner in the carbs.

Any ideas?

 

[tashasdaddy]

Re: 77 70hp low rpm problems

have you check spark and compression? info in the TOP SECRET FILE.

 

[Forgotten]

Re: 77 70hp low rpm problems

I have spark on all cylinders or at least I did last week. I havent run a compression test since it runs great when its on plane. I was kinda wondering if there could be something wrong with the power pack or something like that

 

[Forgotten]

Re: 77 70hp low rpm problems

OK, checked the compression. I have 130 in the bottom 2 cylinders and 135 in the upper cylinder. I checked the gap on the plugs, and 2 of them were about .040, so I gapped em all to .030. I fired it up in the driveway (with hose attached), and it seemed to run fine, but I just know its going to cut up on me as soon as it touches the lake again. What else could it be?