2013 250 proxs rpm help

[mawilsoncobra201]

my motor 2013 250 proxs ser 2b010142 old lower was a torque master gen 1 lower unit. That was a replacement lower not the original. The lower unit that i am running right now came from 1999 225 opti ser 0g825892

[JOE54]

have you looked in gearcase bearing carrier for debri from blow up i found one for a guy one time that had part of a piston lodged in carrier restricting exhaust flow , fyi 1;87 is lower ratio will spin more rpm than 1;75/1;62 did youi replace tuner gasket under adapter plate , posibly blowing water into exhaust at higher rpm , has this engine ever ran higher rpm , put a known good 25 tempest on it and set boat up right for testing, im trying to help ya man

[mawilsoncobra201]

this motor has run 5800 rpm with my 26 tempest+ and torquemaster lower. the lower im running that came off the 1999 225 was a running motor its a temp until i can get a gen2 tm. the reason for the rebuild was no compression in #6 cylinder there was scaring in the cylinder but it did not blow up. #6 resleeved then used a pro marine rebuild kit all new pistons rings bearings and gaskets

[mawilsoncobra201]

I do appreciate the help

[JOE54]

your welcome ,so what if temp is 1:62 ratio

[mawilsoncobra201]

would that cause a significant loss of rpms

[JOE54]

shouldnt be 500 rpm no, 2-300 yes then add heat and humidity another 2-300, put the TM back on it verify ALL switches and sensors are working and reading correctly then lets see what it does

[mawilsoncobra201]

I dont think its the lower unit the older 225 optimax motor ran high 5000 low 6000 with this lower on it with the 26 tempest and the 25 4blade. just about ready for a suzuki 250ss

[JOE54]

all switches and sensors verified yet cyl contribution /drop test at high rpm results yet

[mawilsoncobra201]

waiting on mercury optimax diagnostic computer we have to borrow one from another mechanic friend

[JOE54]

[mawilsoncobra201]

did a compression check again today and dont understand but only have around 85 on all cylinders. new sleeve #6 cylinder. all cylinders got new pistons and rings

[castforcash]

https://www.bbcboards.net/showthread.php?t=267446

Did you follow these instructions when performing the compression test?

[mawilsoncobra201]

going to try and run motor with test computer next week. I was wondering is there a recommended coil other than the oem that you would recommend

[SilverFox579]

I was wondering is there a recommended coil other than the oem that you would recommend

Nope.

[JOE54]

2 nopes

[JOE54]

results of tests please

[mawilsoncobra201]

havent got the computer yet he went on vacation