1runs 1 doesn't

[Jimmy Red]

I have '07 F90TLR. It doesn't start and after checking fire at plugs, it seems weak. Any ideas how to troubleshoot this problem? I also have 99 VX200TLRY with OX66 fuel injection. I need to know how to adjust the oil pump linkage.

[liliepad1]

Spark problem's on that motor are not common . Unless it has no spark at all , no start on the four strokes are normally a fuel issue like water in fuel or its been sitting for the last 3 years and the fuel pump don't run . Confirm that your fuel pump is running , which i do believe runs on key up .

[Jimmy Red]

Thanks for the help. I will bring a fuel pressure gauge from work tomorrow to test fuel pressure. The boat had been sitting for about a year so fuel may be the problem. I tried spraying carb cleaner in the intake but it doesn't start so I was leaning towards ignition problems.

[rodbolt17]

that engine uses a waste spark TCI 12V ignition system.
if the battery and connections are good it either spark or it don't.
no weak.

at key on the pump should run about 3 seconds.

any time 1 plug fires the other in the pair fires.
means you gotta be careful on testing spark.
1&4 fire together and 2&3 fire together.

if you attempt to test spark individually your going to get all kinds of random funky stuff that's going to be misleading.

anytime #1 fires,number 4 fires.
anytime #2 fires #3 fires.

[Jimmy Red]

Thanks rodbolt17! Very helpful info.