Posts: 311
Location: Ontario | Mine hasn't given me a hiccup in five years of heavy use. Long runs, rough water, early season ice, late season ice and a lot of trolling. This year there's definitely something not right. It clunks a bit at low idle (not a piston clunk, just runs rough) and is very sloppy out of the hole. Hesitates, instead of jumping right out. At the RPM range I normally run at, about 3500 to 3800 (@ 26 miles an hour) it runs rough, like it's starving for air, gas or both. If I jump up to 4000, it runs fine. A few things I have eliminated so far:
1. Last year's gas with stabilizier. Used the same exact routine every year for five years, no changes. Ran thru 2 full, fresh tanks since ice-out and it runs the same, crummy.
2. New plugs this April. Swapped them out after they ran rough with last year's plugs. Still runs rough no matter what plugs, this years new or last year's old.
3. Added a bottle of gas line antifreeze to burn out any moisture this past wknd. Still runs rough.
4. Fuel filter is a sediment bowl that's easy to get at. Clean as a whistle.
5. Air intakes are clean.
Guys I've talked with say that the carbs might need a cleaning after 5 years. I think more and more of the gas I burn is inferior quality, too. There are also little bowls off each carb that might contain water if I pull the covers. I'd like to avoid a $200 bill for a guy hooking me up to the diagnostic machine at the marina for a five minute session. Any tips or places to look that I haven't? Thanks in advance. The motor is a 2003 Yamaha 4 stroke on a 17' Lund console. |
