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    2012 Suzuki DF175A dropping RPM at speed

    I changed the low & high pressure fuel filter, drained and flushed my fuel tank and filled with premium unleaded (95 octane rating with additives from Shell). Took the boat for a run and issue seems to be resolved. went through the whole RPM range multiple times, stop/start and back through the...
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    2012 Suzuki DF175A dropping RPM at speed

    to monitor the rail pressure i'd need it plugged into the laptop when running correct? (I have analogue gauges) I moved up the fuel system today checking the low pressure fuel filter, there was 1/4" of rusty coloured water. I'll change low & high pressure fuel filters, and also pull apart the...
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    2012 Suzuki DF175A dropping RPM at speed

    New to the suzuki 4-strokes and facing the following situation. While on the plane and increasing RPM to 4,000RPM the engine dropped rpm to 3500RPM, as I pulled back the throttle slowly the rpm would increase again to just under 4000RPM until it decreases further inline with pulling the throttle...
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    1996 130HP Evinrude V4 looper water pressure gauge install question

    before putting it all together i thought i'd swap the complete thermostat assy (thermostat, spring, grommet, everything). Ran outboard and found that the temperatures in the cylinders swapped! I'd verified the thermos were opening in warm water so i thought... let me swap the thermostat spring...
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    1996 130HP Evinrude V4 looper water pressure gauge install question

    I checked and dbl checked everything in the thermostat housing and the install, nithing looks suspect. Found this though: I think I cooked the impeller from trying to run in a tub but water was only inline with cavitation plate... that won't help cooling at idle 🤭 With the gearbox off I...
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    1996 130HP Evinrude V4 looper water pressure gauge install question

    Yes, I replaced the rubber grommets when I did the thermos. The motor overheats on muffs and in the water. Last test was actually on the water and I was idling out of the harbour at 2,000rpm when I could see the temperature rising (i have stuck on thermocouples near the temp sensor to...
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    1996 130HP Evinrude V4 looper water pressure gauge install question

    Is the my water pressure gauge installation correct on my 1996 130HP V4 Evinrude (looper)?? It has the line that goes to the water pressure gauge coming from top LHS of engine block (first photo) and come off a t-piece that goes to the tell tale (second photo). I'm trying to troubleshoot an...
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    1996 130HP Evinrude PowerPack test question

    Video of engine running on muffs after changing impeller, head gaskets and thermos You can see in the video the lack of steady stream of water out of the small hole in the leg near the starboard side water pickup. It was an intermittent pulse. Normal? Cheers AK
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    1996 130HP Evinrude PowerPack test question

    I changed the impeller when I dropped the leg.
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    1996 130HP Evinrude PowerPack test question

    Update I dropped the leg and opened up the water pump, everything in excellent condition including the impeller. I pulled off the cylinder heads and found alot of build up in the water passages (right photo is before cleaning left photo after) so cleaned both side, new head gasket, new...
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    Help diagnosing marks on piston + cylinder head

    All good! Not trying to doubt the diagnosis... I must've mistakedly assumed that the type of issues you pointed out would result in an immediate catastrophic failure if the motor has been running @5000RPM for periods of 30mins at a time. Count myself lucky to have made it back to the dock!
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    Help diagnosing marks on piston + cylinder head

    I've had the boat out and motor seemed to be running fine through full range of RPM over a number of hours, I would've been none the wiser had i not taken off the cylinder head as i was looking for source of overheat. Apologies if this is a stupid question,... with the potential damage you...
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    Help diagnosing marks on piston + cylinder head

    Hi there, I pulled off the cylinder heads to clean water jackets due to suspected excessive salt/gunge buildup which may be the root cause of my overheat problem and discovered the following on portside #2 piston/ cylinder head. video showing port side piston and cylinder head markings cylinder...
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    1996 130HP Evinrude PowerPack test question

    If i've got a steady flow of water out the tell tale do you still think the water pump might be at fault? I'm not set up to drop the leg so i'll need to take it to a mechanic
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    Evinrude 130HP switching from 3 blade to 4 blade

    Yep, i've since realised :) . For the price i paid it was worth trying. Hopefully by posting test data (acknowledging the limitations and mental averaging I had to do) on forums like this it'll give the next guy more info to go on when making the decision on what to try... I'll keep an eye out...
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    Evinrude 130HP switching from 3 blade to 4 blade

    just a scatter plot in Excel. Like i said i had to mentally average some of the data points because there was variation... Cheers AK
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    Evinrude 130HP switching from 3 blade to 4 blade

    Tested 3 props in the same conditions one after the other 3 bladed OMC aluminium 14 1/2" x 19" brand new, 3 blade OMC stainless 14 1/2" x 19" in good condition but been repaired in the past, 4 blade SOLAS HR4 stainless 14 1/4" x 17" brand new. Note that there were some fluctuations in readings...
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    1996 130HP Evinrude PowerPack test question

    Finally did the water test. After about an hour of cruising at varying RPMs the dreaded SLOW mode kicked in again (no alarm or light on the tacho), switched off and started again, after a little while same SLOW mode (no alarm or light on the tacho). After spending half hour at the dock i went...
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    Evinrude 130HP switching from 3 blade to 4 blade

    Thanks for the sharing everyone. I'm going to try the 4blader (found a new secondhander at 1/3rd the price of store new) and i'll report back on performance.
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    Evinrude 130HP switching from 3 blade to 4 blade

    recommended top end RPM range per the service manual is 5,000-6,000RPM Thanks for sharing your thoughts! AK
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