1990 25hp very hard to pull

[mike4764]

I recently bought the motor in question. It was running fine when I bought it. I never used it myself so I have no refrence. Over the winter I bought parts to make it electric start. A starter motor rectifier and stator. I put them on along with a new battery and cables. I tried to start it on a stand with no water hook up just to see if it will start. It barely turnes over like the compression is too high. The starter motor can hardly get it to turn. Pull starting is no easier. If I remove the plugs it spins fine with the pull starter and the electric starter. Any ideas on what could be wrong?? Im very frustrated as I tried everything I can think of.

[boats.net]

Not sure, is starter housing touching flywheel?

[phillnjack]

have you changed plugs and put long reach plugs in ?
is this with a perfectly charged battery capable of 300 cca ?

check you have correct plugs installed.


phill