| Author |
Message |
    
Green Guava
New member
Username: green_guava
Post Number: 2
Registered: 08-2007
| | Posted on Thursday, August 09, 2007 - 11:06 pm: | 
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I have a 1998 BF90 thats acting up. I ran it three times and after about an hour the motor started losing power and the tach started jumping around from 0 to 8000 (past the max) just bouncing back and forth. I took my mechanic out the other day and ran it for 5 hours and it ran fine.(frustrating) He thinks its electrical (coil or emu/ecu), but without it acting up in front of him, he cant do anything. I changed fuel filters, cleaned and synced carbs, plugs, alternator (under flywheel) and another electrical part associated with the alternator (4'x4' box that has cooling fins. forgot name.) Has anyone had a similar problem? Any help would be greatly appreciated. the last few times i ran it on the same tank of gas. thanks for any help. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 2119
Registered: 09-2006
| | Posted on Thursday, August 09, 2007 - 11:59 pm: |
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rectifier
is the thing with fins
that would cause the problem |
Green Guava
New member
Username: green_guava
Post Number: 3
Registered: 08-2007
| | Posted on Friday, August 10, 2007 - 12:25 am: |
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thats it. i changed the rectifier also. |
Green Guava
Member
Username: green_guava
Post Number: 4
Registered: 08-2007
| | Posted on Wednesday, August 15, 2007 - 08:49 pm: |
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any other suggestions would be great. thanks |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 2158
Registered: 09-2006
| | Posted on Wednesday, August 15, 2007 - 08:57 pm: |
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why still have problem |
Green Guava
Member
Username: green_guava
Post Number: 5
Registered: 08-2007
| | Posted on Wednesday, August 15, 2007 - 09:30 pm: |
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yes. i changed all those things even the rectifier and i still have the problem. i haven't changed anything since my first post. is it possible my mechanic put in a defective rectifier? thanks |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 2165
Registered: 09-2006
| | Posted on Wednesday, August 15, 2007 - 10:39 pm: |
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check all battery connections
there is a test for the alternator
Honda dude will jump in here |
Green Guava
Member
Username: green_guava
Post Number: 6
Registered: 08-2007
| | Posted on Thursday, August 16, 2007 - 02:42 pm: |
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I run two batteries. both are new and the connections are solid. The charging system seems to be fine. it is usually around 13v-14v on my gps voltmeter. The boat runs fine for a while, then the tach starts jumping around and the boat starts to sputter a little and lose power. it never quits, but once it starts doing that i bring it back to the pier. i've ruled out gas, because i switch from my in-floor tank to an external tank both with fresh gas and fuel wouldn't make the tach sputter. thanks for your help. |
Green Guava
Member
Username: green_guava
Post Number: 7
Registered: 08-2007
| | Posted on Monday, September 03, 2007 - 02:45 am: |
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I've figured out my problem. Hope this helps others. It was my Ignition module CDI ($500). I spoke to another mechanic i my area and he had one other customer that had the same problem. ran fine for A few hours then dropped a cylinder and started missing and not getting full rpms. Once it cooled off it would run fine. Thanks for the help. |
Gaylen
Visitor
| | Posted on Friday, April 25, 2008 - 10:09 pm: |
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Does anyone know if you have a section of an impeller gasket missing if this could block something and keep the cdi unit from working. I have power going into the cdi unit but none coming out. I was out running the river when I pulled the throttle back to neutrel and the motor stopped and has not started since. 1998 BF90 |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3886
Registered: 09-2006
| | Posted on Friday, April 25, 2008 - 10:31 pm: |
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it is your NSS or ESS
neutral stop switch
or emergency stop switch |
Gaylen Fletcher
New member
Username: gaylen
Post Number: 3
Registered: 04-2008
| | Posted on Saturday, April 26, 2008 - 09:28 pm: |
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Hi, checked the stop switch by bypassing it and motor cranks but still won't start. I can put the motor in gear and it won't crank but when I put it in nuetrel it will crank but still won't start.
Does this sound correct? |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3897
Registered: 09-2006
| | Posted on Saturday, April 26, 2008 - 10:08 pm: |
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yes correct |
Gaylen Fletcher
Member
Username: gaylen
Post Number: 4
Registered: 04-2008
| | Posted on Saturday, April 26, 2008 - 10:57 pm: |
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could a thermostat malfuntion cause the motor not to start? Thanks for any info. |
JUST-IN-TIME
Senior Member
Username: justintime
Post Number: 3898
Registered: 09-2006
| | Posted on Sunday, April 27, 2008 - 01:16 am: |
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no |
