rough idle

Posted By: Richard Dickerson, P19#1370 Lubbock, TX------WebKitFormBoundary1w9bPAhs+EporkBY
Date: 7/4/08 10:54a.m.

Report: outside forum guidelines

In Response To: Stale gas? (Dave Kautz P-15 #1632 & O'day 192 #313, SF Bay)

I had the same problem with a 5hp 4-stroke until I replaced the carb with one for a 6 hp nissan 4-stroke.
Apparently, the only difference between the nissan-tohatsu-mercury 4-5-6 is the carb. measuring the throat of the carb for the 5 versus the 6 showed no difference with a ruler. I'd bet the only difference is the jet size allowing more fuel and a higher top end. Anyone want a 5-hp carb? After the change, the motor idles beautifully, runs great and still gets about 8 hours on three gallons of gas at hull speed.

Messages In This Thread

Rough Idle 4 stroke 4 hp Nisson -- George Angelini -- 7/4/08 8:37a.m.

an idea.............. -- Fred Gilbert Sanibel "Peorian" -- 7/4/08 9:55a.m.

Stale gas? -- Dave Kautz P-15 #1632 & O'day 192 #313, SF Bay -- 7/4/08 10:05a.m.

rough idle -- Richard Dickerson, P19#1370 Lubbock, TX------WebKitFormBoundary1w9bPAhs+EporkBY -- 7/4/08 10:54a.m.

The venturi is probably different.... -- Dave Kautz P-15 #1632 & O'day 192 #313, SF Bay -- 7/4/08 1:29p.m.

Venturi size IS different between 4 HP and 6 HP. -- Bill Nolen, WWPotter Owner's Web Site -- 7/4/08 8:55p.m.

Venturi -- Richard Dickerson, P19#1370 Lubbock, TX------WebKitFormBoundary1w9bPAhs+EporkBY- -- 7/4/08 9:09p.m.

Diff between 4 - 5 - 6 -- Tohatsu Guru -- 7/5/08 7:15a.m.

Venturi size -- Bill Nolen, WWPotter Owner's Web Site -- 7/5/08 7:42a.m.

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