For some reason it seems each hole should be the same, to give equal slip on each blade....so either all clised ,all small hole or all bigger hol or no plug.
This is called exhaust cavitation. I had the same problem with my 225 xs motor. I had no plugs in the prop when this was Happening. I put the vented plugs in and that solved the issue. The fully closed plugs bogged the boat down pretty badly.
I recently discovered these props, with holes in them. I’m pretty sure they are there to make the boat go faster top speed. I’ve got an old 17 foot checkmate with a 93 Evinrude 140 that has some “upgrades”. I have a vented SS 13.5x24. 74 mph bad hole shot. Other ones a SS 14x17 I think. It does about 45, but it gets there in about 4-5 seconds.
Trim has a larger impact on hole shot than jack plate! Trim fully in for start, begin trimming out as you near plane speed! I was hoping this would show differences in plug hole sizes, not jack plate adjustments with no plug changes!
Switch to fullly closed off you have the new stroke those have so much torque you dont need the exhaust gasses to help it get into the power band you usually use performance vent plugs on 2 strokes switch to fully plugged holes and you shouldn't blow out at all if you try it lmk ur results
what RPM are you at when the nose rolls over and you get up on plane? You typically want to shoot for 3800-3900 for optimal hole shot. Typically the blow out happens due to the engine being too high and I believe that's why you see improved hole shot when drop the engine. The other thing that can cause blow out is having too much venting on your prop..that will cause the air bubble that the exhaust creates to be too large and leave no water left for the blade to load up on. Depending on your RPM when you roll over on plane and the amount of slip you're seeing we can further improve your performance. I'm running 3 plugs in my tempest that are all solid and I see 3 second hole shots without having to manipulate the jack plate at all.
@unlock_your_dream_home . For 2 stroke yes, 4 stroke has higher low end torque so most 4 stroke leave the plugs in. I bought my boat used and had terrible hole shot ( Mercury 150 4 stroke) all plugs were out and was missing the prop ring . Installed prop ring and all 4 plugs and instantly the boat jumps out of the water now ( 4 blade prop)
Thanks for this video. I've got a 2 stroke optimax 115 (Trophy Pus 21p prop) on a 2012 stratos 186xt (my son's first boat). Our hole shot stinks. I ordered four solid ones. They are a pain installing them as well..
@@davidclementsfishing-thewh3200Switch to fullly closed off you have the new 4stroke engine those have so much torque you dont need the exhaust gasses to help it get into the power band
The video was supposed to show the differences in the Plug sizes you didn’t do anything with that You were only messing with jack plate Waste of time watching sorry
It's simple....if it over revs (over4,500 rpms) the prop is getting too much venting. If it bogs down it needs bigger plugs so it will vent more. I bought solid plugs and drilled holes. Test ran and enlarged the hole till it went too far then drilled a second set at the previous size.
