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Catalina/Capri 25/250 Sailor's Forums

General Sailing Forum

brand new Honda 9.9 "problems"

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josgood
1st Mate

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USA
57 Posts

Initially Posted - 01/04/2009 : 17:39:13

I sail at just above 9000 ft above sea level. I bought a new Honda 9.9 and had it jetted for the higher altitude by the dealer.
running it (on my C-25)it has no more power at full throttle than it does at 2/3rds(or less) and only gets me up to 5 knots with no wind. sometimes it stalls when at low power entering or leaving the slip if I "gun it" some for prop wash turns...
any thoughts besides removing it and bring it back would be helpful

John Osgood
MastConfusion
'87 C-25 Std. WK
Lake Dillon, Colorado

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dave holtgrave
Captain

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USA
427 Posts

Response Posted - 01/05/2009 : 10:40:19

i'm trying to remember how mine is but, i don't run it wide open.
i can tell you the most variations in speed are in the 2/3 to 3/4 range.

i don't know about the speed but i think i push hull speed at 2/3 throttle.

not much help but, again the biggest variation is in the lower throttle speeds.

dave holtgrave
5722 sk/tr
hard and dry near carlyle lake in southern illinois.
elev around 442ft

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 01/05/2009 : 10:44:00

John,
Did it run all right after the dealer rejetted it? It sounds like either dirty jets or a malfunctioning choke. If you can remove the idle and high speed jets you can soak spray some carb cleaner in a cup and let them soak a few minutes and blow them out with compressed air. You can use a small diameter wire to assist in cleaning also. The Honda jets have incredibly small orifices and they clog easily. If you need help finding them let me know. Make sure your choke is turning completely off also.

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/05/2009 : 10:45:43

I have other Catalinas pass right by me with their motors running. does yours ever stall when entering or leaving the slip when you gun it a little? mine famously does when I enter the slip slowly in forward, put it in neutral for a moment and then reverse to stop it. when I hit reverse with some good throttle, it stalls 90% of the time.

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/05/2009 : 10:49:14

I had it jetted as brand new. it "runs good" in the sense that it always starts with one short push of the electric start button and get's me in and out of the "harbor" are ok... just at low idle and "full" throttle it seems off

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Happy D
Admiral

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921 Posts

Response Posted - 01/05/2009 : 11:35:24

It sounds like it was jetted too small. Talk to the dealer that did it. Take them out with you and show them. Obviously they didn't get it right.
If you take it apart, that might casue problems with the warranty.
Dan

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/05/2009 : 12:26:17

any chance that the high thrust prop is too much for the motor at that altitude? someone suggested changing it to a lower pitch..

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 01/05/2009 : 17:22:32

I doubt many of us have experience with high altitude settings and how they might interact with a high thrust prop but it is my understanding you should still be able to reach hull speed with a high thrust prop. Since this is a new setup I would call the dealer and get his input. The engine is not working properly. A normal Honda 9.9 engine would reach hull speed at just beyond half throttle. If you mess with it your dealer will be looking at you as the problem. I know its a pain but you need to stay on the dealer until he gets it right.

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/05/2009 : 17:27:51

ok, seems like what I need to do. can you tell me what effect the high thrust has (compared to a regular prop)when powering the boat?

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Sloop Smitten
Master Marine Consultant

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USA
1181 Posts

Response Posted - 01/05/2009 : 18:14:20

More power at lower RPM's so you should have more control around the dock. It also burns more gas to achieve the same speeds as a standard prop. More strain on the engine also. At high speed you are still limited by the boat's hull speed.

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/05/2009 : 18:24:35

ok, got it. power around the docks is good. gas is not a problem by any means.. uses almost none..
thanks for your help

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Dave Bristle
Master Marine Consultant

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Djibouti
10005 Posts

Response Posted - 01/05/2009 : 20:23:12

The high-thrust prop <i>is</i> lower pitch than "standard", so actually less strain on the engine at any RPM. It's like a lower gear in a car transmission--better at low speeds or from a stop, but requiring somewhat higher RPMs at cruising speed. Standard props are generally pitched to efficiently drive smaller boats to higher speeds, and are less effective for starting and stopping a heavy displacement hull.

Since your dealer altered the engine (on his recommendation?), I think he owes you a look at what's going on. And besides, it's still under warranty, right? Don't mess with it--let him get it right. Honda has pretty high standards for their dealers--they're supposed to get it right. (Correspondingly, you can't buy a Honda from a mail-order or web dealer.)

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Jefffriday
Navigator

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USA
198 Posts

Response Posted - 01/09/2009 : 10:00:35

I have basically the same problem with my Tohatsu 9.8 on Ruedi resv (about 8000 ft) I re jetted it with the recommendations from Tohatsu, still not great, in fact,I don't think it changed at all. 2 other C-25's on our lake have the same motor (they have electric start, wish I did) and seem to have no problems at all. I am going to compare props next spring. I can still make 5.7 or 5.8 knots, but every once in a while, Murphy makes sure it's at a critical juncture, it quits....

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josgood
1st Mate

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USA
57 Posts

Response Posted - 01/25/2009 : 23:07:19

yep, sounds like my motor. wonder if I should put the original jets back in...
don't think that using high test or putting in the red stuff (to keep it from going stale) to the gas would do anything? do you guys put this in during summer season?

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