Got a Yamaha 90hp 97 mod used a few years ago. It runs rough at low end through mid range. Last two seasons I have taken it to a shop where the mechanic soaks the carburators. Guy says that it is a mystery to him that it keeps doing it and says he has never had one act quite like this before. He has been out on a water test and says it sounds like it is dropping one of the cylinders. I see on the Yamaha home site that there are carburator repair kits available. Are there any Yamaha mechanics on here that think a repair kit for each of the three carburators is going to accomplish any more than soaking the carbs? Thanks for any advise. NV
Harry Krause 26 February 2005 19:02:46 [ permanent link ]
On Mon, 21 Feb 2005 20:03:27 GMT, "Nick VanderWal" <nvanderwal@se.rr.com> wrote:
Got a Yamaha 90hp 97 mod used a few years ago. It runs rough at low end >through mid range. Last two seasons I have taken it to a shop where the >mechanic soaks the carburators. Guy says that it is a mystery to him that it >keeps doing it and says he has never had one act quite like this before. He >has been out on a water test and says it sounds like it is dropping one of >the cylinders. I see on the Yamaha home site that there are carburator >repair kits available. Are there any Yamaha mechanics on here that think a >repair kit for each of the three carburators is going to accomplish any more >than soaking the carbs? Thanks for any advise. NV
I had three of these hanging off a 19' Baja. A blast to drive out in the open sea.
What specific tests did the tech perform on this powerhead?
There is a diagnostic procedure for most engines I have worked on and they usually pinpoint the cause of the problem. This starts with a basic visual inspection, then moves on down the line to a simple spark, compression, fuel and other simple tests. If any problems are detected, then often a teardown of certain parts of the powerhead is required in order to have a closer inspection.
It almost sounds like this tech didn't do his basic checks. I would recommend getting a service manual for that powerhead and having a closer look at other possible causes. And maybe find a new tech. Just my opinion.
