Bottom piston has blown. I haven't stripped the crank out yet, so don't know if a rebuild will be economic. Possible, if the damage is contained to the bottom pot and the crank has survived.
Hoping to get a powerhead from a motor with a knackered lower unit.
yip thats the best way to go at the moment . Strip that block and check how bad it is . It may just be a scored Bore with a damaged ring and that will be easy to replace . Bore it out to the oversize piston and away you go . let me know and pics would be great
As suspected, the bottom piston has blown and the bore is pretty badly scored too. The main bearing between mid and bottom cylinders has collapsed and there's a lot of swarf all around the bottom cylinder.
I think a rebuild may be too costly on this one, so still on the lookout for a replacement powerhead.
Still looking for a powerhead, but wll break the motor, if anyone's interested. It's 1997 and all the bits except the block, crank and bottom piston/conrod are re-cyclable. Good lower unit, PTT, control box, carbs, etc., etc.
Do you still have this?
Tentatively looking at ways to make my 1991 DT85 a bit more reliable as replacement is completely out of the question.
Possibly looking at worn carbs so if you have a price in mind and they're compatible.
Issue I have is that middle cylinder is down a little on compression and at the moment it dies when you try to put it into gear and open it up from idle. Runs OK when going!
As an aside, can I do anything to improve a cylinder compression other than rebore and oversize the new parts?
