had a bad day at the lake sunday first i lost my muffler can then i couldnt kill the boat when i brought it in checked needles and checked arb linkage butterfly shut still kept running had to put my finger on barrel to kill it fired it up agan pow lost comp brought it home pulled it apart and to my horror bearing cage had let go ruined my cyl total teardown time real bummer i have another boat to run but it sucks my v hull will be down for the season i have never taken down the bottom end before going to be a learning exp may send the motor to someone had fastrat in the past but he doesnt bulid anymore o well

Bummer Any idea what caused the bearing failure?

This article shows a basic teardown and reassemble... it's actually pretty straight forward. You can do as in the article and use a torch to heat the cases to drop and fit the bearings or use your oven at 350-375. I use the torch myself but that's just me.

You are refering to the piston bearing that broke right? Not the crank bearing I hope...

We've seriously abused Quickdraws and Zenoahs and never had a needle bearing failure. Others have overheated (turned blue) the rod bearing from continuous high rpm operation without failure. Did you hydraulic the engine? That could bend the rod or hurt the bearing race enough to cause failure.

Lohring Miller

its a mystery as of yet i run good oil klotz kl100 80z to gal no extreme rpms i dont understand it unless i sucked somthing through the carb?

The symptoms you describe really sound like the motor was sucking air somewhere causing it to go wild (and run lean). Possibly at the carb spacer among other places...

Steve, by the way , your Email keeps bouncing back everytime the system tries to notify you of new post replies... I get them on the administrator end. Can you please update your profile with your working Email addy. If you want me to do it for you simply let me know and I will set it up for you.

im sorry marc ive been having trouble with my computer just had a new hardrive put in but still having trouble going to have to take it back to the shop . have not been having very good luck these days my main email address is This email address is being protected from spambots. You need JavaScript enabled to view it. second is This email address is being protected from spambots. You need JavaScript enabled to view it.

here is the culprit time for a bottom end rebuild bearings let go on the bottom of con rod here is a pic do any of yoy motor gurus think the crank is salvagable if i polish the shaft also how hard is the tturbo crank mod to do may do some mods while its tore down