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  1. S

    MFS6D observations

    Retired my M5B, circa 1995ush is my guess, for the SailPro ULS... Man what a difference. Some observations to anyone contemplating one... I'm 4 hours into break-in. Had PDI done by local dealer. Running mix of ethanol and ethanol free for now. 1) Much, much quieter of course, more so at...
  2. S

    Gear case fix

    Just documenting the replacement of my prop shaft seal on my mid-90,s vintage M5B workhorse…. I have factory and aftermarket manuals. 90% done… likely the seal is original, but not sure as I’ve only owned motor for 7 years, it sat for 8 years before that in storage as prior owner was in...
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    M5B throttle not holding mid-range

    Have a 1995ish M5B. Have factory and after market manuals, etc. Have owned for 8 years now and have done a bit of work on it with help from this forum. Generally runs good. Starts on 2nd pull religiously, even on first pull at times! The issue I’ve had for years.. the throttle holds...
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    Whistling Dixie...oops i mean Tohatsu...

    Have a 1996ish M5B. Have factory manual and i maintain the engine... Since owning it in 2014 it's been running ok. Starts on 1st or 2nd pull more or less. Idles ok. Over the years i've rebuilt the carb (full rebuild), new valve cover, new water pump, etc... last year it ran fine. this...
  5. S

    Trouble keeping throttle at “low-mid rpm..”

    Engine: 1994ish M5B Note: I own factory service manual, have rebuilt carb (using carb dip), new plugs, new plastic throttle friction component installed. ever since I owned this motor (before and after carb rebuild), when I go from idle to mid throttle range the throttle will back off down to...
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    Lower unit water in?

    Have a 1994ish M5B ULS. Noticed when I drained oil in late early December it looked like this the attached. Note that it has been in the jar since December 5th or thereabouts. It doesn't appear the "milky white" - but it didn't come out clean either...assuming this is water infiltration...
  7. S

    M5B sanity check...

    This 1995 beast seems to be ok, but shakes a bit more than I expect lately. see video in gear and idle. First 10-15 seconds in gear, then thrown into idle. Tach can be seen at bottom of screen...one of the hardline techs. This seem ok to u guys?
  8. S

    Colt 1.2hp rebuild

    Getting started on a first-time total rebuild project - 1986 Colt 1.2hp. Factory service manual is on order... At this stage, main task is to clean engine block and gasket surfaces. Please see attached. I am thinking of using carb cleaner and scotchbrite/plastic scraper for gasket surface...
  9. S

    M5B Internal to External Tank Conversion

    So I am near completion of converting to an external tank . Two areas that need to be addressed: 1) See picture below as to how the fuel line routes from the connector into the carb. I need to make a 180 degree turn in order to flow this into the carb. Not liking have all this hose inside...
  10. S

    Very Long Term Storage...

    I have a friend who is moving away for about 4-5 years and thus won't be using his Tohatsu 6HP SailPro. He asked me for some long term storage advice... Other than the usual and customary winterization (change lower unit,etc), i am thinking he should: run ethanol free fuel thru system to...
  11. S

    1 spark 2 spark rev 2 rev...

    ...not a Dr Seuess quote..but... I acquired a Hardline tach/hour meter, and own a 1994ish M5B 5 HP 2 stroke cylinder. Does anyone know if this engine fires: a) 1 spark per revolution b) 1 spark per 2 revolutions c) 2 sparks per 1 revoution (wasted spark?) Also, regarding compression testing...
  12. S

    now I know why I am not getting power....(M5B 2 stroke)

    So here I am thinking....i'm not getting any higher RPM's because the carb float is wrong, or the throttle friction piece is worn.... when I worked on the motor over the winter the cylinder head looked perfect. after rebuilding the water pump and carb, I am thinking EASY...
  13. S

    Tachometer question

    I have a Harbor Freight induction tachometer I picked up for a few bucks. It has settings for 3-8 cylinders. No setting for 2 vs. 4 stroke. on a 2 stroke single cylinder could someone suggest the right cylinder setting? In fact why is there even a cylinder setting? Also should the induction...
  14. S

    M5B 2 stroke - some issues

    So I was all fat and happy rebuilding the water pump and carb. Have the factory manual, etc. Somewhere I screwed up - at least the with carb I think, the water pump is doing fine...;> 1) For some reason when the motor is OFF, i can't shift into reverse. When motor is running, I can. I find...
  15. S

    Tohatsu 1994ish M5B - throttle control arm

    The throttle control arm is acting weird, every time I try to turn it and rev the engine it keeps turning back down. i have the set screw under the arm tightened all the way. could it simply be the plastic friction piece that is worn? or, could there be something with the cable bracket...
  16. S

    Servicing Water Pump - Pulled Shaft out...MB5 2 stroke...

    ...or as Paul calls them "the Flintstone outboard...:> Following the official manuals i am having trouble getting pump lower case off the gearcase - finally got it off - it prob hasn't been serviced in 10-15 years other than a new impeller... Problem is two-fold. 1) Go the lower case...
  17. S

    1994/5 M5B - troubleshooting/questions

    This is a new to me motor that came packaged with a sailboat I recently purchased. First time owning a two-stroke - as I had a diesel inboard before this, and a 4 stroke on a smaller boat in the past... On this motor toward the bottom of the Drive Shaft Housing there is a rubber grommet/plug...
  18. S

    Flushing Tohatsu M5B motor...

    Just got this motor, and in the manual it states that in order to flush the motor, you need to "Remove the Water Plug on the Drive Shaft Housing and screw the flushing plug." Two questions: 1) Where on the Drive Shaft Housing is the Water Plug? 2) In the parts kit I have what appears to be...
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