A technical forum for Model 7 to Mercury
I'm rebuilding a 99 600cc (SS?) and just taken the barrels off.
You can see the damage in the attached photos.
The pistons are stamped +020 so it's had one rebore. From the cylinder scoring it needs another.
What are my options with regard to the damaged skirts?
Many thanks,
Derek
Can anybody advise the correct length for an Atlas exhaust valve? I believe they are the same as the Dominator as the parts list indicates.
Thanks.
This morning I pulled the crankshaft apart on my barn find Domi 99. In a previous post I mentioned that a large chunk of the drive side oil seal support face in the left-hand crankcase was missing. Well I think I found a lot of it today - the sludge in the crankshaft was solid and much of it sparkled more than Fools Gold. The ‘best’ bit was a chunk of aluminium 5mm long and 1mm thick (photo below). It should make a good doorstop :-)
After seeing the state of my Domi 99 engine I’m starting to question every item in there.
Just for historical accuracy does anyone know what was in the toolkit sited under the seat, got the tool tray but no tools!
Hi.
I’m going to be needing some new pistons once my barrels have been repaired. I’ve heard lots of different opinions about various brands. I’ve been warned about GPR ones - someone said that the pistons are ok but the rings are rubbish. Someone else said that he’d had problems with JP pistons and I’ve been advised not to go anywhere near Hepolite ones unless they are genuine old stock. (I was told that Hepolite are now made somewhere in the Far East and are of dubious quality).
After fitting an experimental oil catch tank to the crankcase breather on my 1956 Dominator 99 to check on the amount of oil that drips out of the breather pipe, I intend to reposition the catch tank and fit a breather valve prior to the catch tank. Can anyone recommend a suitable neat one way breather valve ? I think that they are called a PVC valve.
George
My single carb 650SS starts well enough from cold, and performs very well. I had the mag rebuilt in 2012. Recently I have been suspecting that, after a 3 year lay-up, the spark was a little weak, so the other week I took it to a mag specialist who dismantled it, checked everything through, cleaned it, tested it and declared that even if he rewound it, a better spark would not be achieved; good as new.
Just clocked-up 500miles on my rebuilt Mercury. I have been allowing the revs to build slowly over this period and yesterday let it go to just shy of 5,000 rpm. Wow! Really starts to fly over about 4,000rpm.
This got me thinking where peak torque lies on this 650 single carb engine.
Anyone got any relevant figures, or graphs of torque/BHP for this engine?
Best regards,
Chas
