The Carbureted engines should be 550-650 rpm idle
In Gear (in the water), and will be a little higher in neutral. Also yet a little higher when running on the cuffs because there is no back pressure on the exhaust.
The Fuel injected engines are computer controlled and should be 600 rpm in neutral or in gear. A high idle would usually only be caused by a throttle cable adjustment (not reaching the idle stop), or by a faulty IAC (Idle Air Controller). A faulty IAC often causes surging of the idle RPM.
tablerock230 wrote:
Dealer took a look yesterday. Says the cable and motor are fine. RPM are right on at 600. Says the gauge is not accurate. Says the clunk when going into gear is normal. Assures me no problem or damage done. I'll take that answer unless someone more knowledgeable thinks I'm being misled.
If it really is idling at 600 rpm and seems to be producing a loud clunk sound, I would have try to have them prove to you that this is normal. Is there another new boat there that they could demonstrate to you that it shifts the same? (with a similar size VP DP drive). Maybe it's an intermittent problem and they did not see the same rpm as you have been seeing? If not, then as Lou said, they should replace the Tach under warranty if it is reading almost double at idle.
My boat idles at 600rpm (in gear), and 1200rpm is about as fast as I can go in a "no wake zone" pushing the boat at 6-7 mph. That's a big difference.
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"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings