Logo
FULL SITE MENU

Search results

  1. N

    RPM on Cylinders 2 & 3 twice that on Cylinders 1 & 2

    I have a 2003 Yamaha F90TLRB. When doing some testing the cylinders 1 & 2 read 1300 RPM, and cylinders 2 & 3 read 3600 RPM on a digital tach/timing light. What does this mean or indicate? Ignition Coil 1 fires cylinders 1 and 4, while Ignition coil 2 fires cylinders 2 & 3. The ignition coils...
  2. N

    2003 F90TLRB - Yellow Wire to TCI/CDI and Tach Signal ???

    What is the purpose of the yellow wire that is connected to ground and the 8 pin (middle) connector on the TCI/CDI ??? I'm curious since it's the only ground wire that's connected through a bullet connector and could be disconnected by itself. It's also my understanding that this motor uses a...
  3. N

    2003 F90TLRB Water sprays out exhaust port

     I an see water spraying out the exhaust port on the back of the motor. It's not noticeable at idle, but much more apparent when running the motor around 1500-2000 rpm. Is this normal or do I have a serious motor issue, like a blown head gasket or worse? <br> <br> Bob<br> Cape Coral, FL<br>...
  4. N

    2003 F90TLRB Intermittent Tilt Problem

    I have a weird tilt problem. Can tilt full up or down once, then don't have any tilt. Let it sit overnight and I have tilt for a minute or so and it stops again. Relays and relay contacts check good. I see there is an internal circuit breaker in the tilt motor. Can it behave that way? The way it...
  5. N

    Ultrasonic Carb Cleaning

    I recently bought another boat, had problems with the carbs, and discovered they needed a good cleaning. I’ve read over and over again to use an ultrasonic cleaner. The carbs on my Yamaha F90 have a dozen or so openings and passageways so I finally decided to break down and buy one. It’s been...
  6. N

    2003 F90 Compression Test Results ??

    I got compression results of 210, 210, 210, and 175 PSI, on a 2003 Yamaha F90TLRB (61P L 1000850). The service manual says compression should be a minimum of 135 PSI. Do I have a problem with cylinder #4? I'm new to this but everything I've read says they should be within 10% of each other.
  7. N

    Honda BF50AY "NO SPARK" problem

    Hi Mike, You're right. The high resistance on the spark plug resistor cap for cylinder 2 didn't appear to make any difference. I also gapped and installed new plugs before running these tests. Digital tach rpm bounces around 1740-1930 rpm with the boat tach reading around 1000 rpm on all 3...
  8. N

    Honda BF50AY "NO SPARK" problem

    I have a 2000 Honda BF50AY that I'm getting no spark on any of the cylinders.<br> <br> I have not ohm'ed out the CDI unit yet but the exciter coil, all 3 pulser coils and all 3 ignition coils tested in spec. The service manual says you have to remove the spark plug cover to get the correct...
  9. N

    2000 Honda BF50AY Timing/Carb Issue?

    I recently installed a new tach and charging coil. I ran the motor for about an hour just fine. Coming back in it started sounding like it was missing and sputtering or coughing at low rpms. It idles high, around 1100-1300 rpm which I verified with an inductive timing light on all 3 cylinders...
Back
Top