1999 Johnson 130

Hi guys,

I have a 99 130 Johnson looper that I just bought - with a bad upper port cylinder. The guy I bought it from says you can hear the piston knocking around in the cylinder - I take him at his word and don't really want to fire it up for fear of doing more damage to the block.

But, based on the fact that we know it's knocking around in there, is there any chance I'll be able to repair just that one cylinder? Obviously I'll need to take a look inside to see how bad it is, but should I even bother? Is a power head swap the right thing to do from the get-go?

I'm assuming I should rebuild the carbs as well to correct for potential lean condition that caused the original failure...

Thanks!

Re: 1999 Johnson 130

Normally you may repair just the one cylinder. You will need to see what damage has been done.

Re: 1999 Johnson 130

Pull the cyl heads and take a look. If it was my mtr I'd put it on a flusher and start it up just to see how bad it sounded. You could also have a bad lower unit doing this as sound does travel.

Re: 1999 Johnson 130

Ok, I didn't start it up, but I did go ahead and compression test the 4 cylinders.

Top port - 75
top starboard - 135
bottom port - 120
bottom starboard - 120

Pretty much confirms that the suspected bad cyl is indeed bad. Next, I'll pull the head and take a look.

After that... bottom end? (sorry, if that's not the right term - I'm thinking in car engine terms)

thanks!

Re: 1999 Johnson 130

Well, here are the pictures:

I think there is some scoring even in the lower cylinder... I can feel it with my finger.