General Category > Bike Builds, Rebuilds And Restorations Only
1979 1000 SP project
Brilig:
Well, Ive been undecided about how far I wanted to take this project, but a compression test told me I needed to take the engine all the way apart.
The top end came apart with the usual stuck bolts, but with a little PB Blaster and patience nothing snapped. :thumb:
The Haynes manual says to keep track of everything so it goes back in the same place. Makes sense and I'm sure I would have done it that way anyway.
image uploader
Here is what I found. The Starboard piston and head have a series of small dents where a small object, probably a pebble, got inside and pounded the heck out of things before being blown out with the exhaust.
I think this is because the bike has dual spark plugs and one is in a vertical position and a small pebble must have rolled in while I was changing plugs.
I'm going to have to be very careful that never happens again
My magnet sticks to the cylinder bore just as strongly as it does to my steel wrenches so I am guessing these are cast iron cylinders and not the chrome or NiGuSil and that's a good thing,am I right? They can be honed back in to shape?
Also, while playing with the magnet I found the exhaust valves are made of something the magnet won't stick to. Some kind of stainless? Is this normal for Guzzi's?
The cylinder bores have some scoring but I don't think it's too serious.
Back in the 1980's when I had the bike on the road I made these carb minifolds to point the carbs straight back to create space for the rectifier, regulator, and starter relay in front of the battery. I also switched to a smaller battery.
The original owner added a second spark plug but didn't do a good job of getting it connected because it was so far down in between the fins. I made these extenders out of brass and teflon so that I could get the spark plug boot properly into place.
The original owner also chrome plated the valve covers. I never did like the look and now the chrome is trashed so I will be bringing these back to plain aluminum. Who knows, maybe I'll buff them up real shiny :thumb:
Tomorrow I will work on drifting the gudgeon pins out of the pistons.
Brilig:
This is my first time rebuilding an engine so I am moving a little slow while I figure things out.
The Haynes manual suggested putting rags soaked in boiling water on the pistons to get the gudgeon pins out.
I had my doughts about this but it worked great.
Next I modified a C-clamp with felt padding for the valve face and a piece to compress the spring retainer. Compress the spring and grab the retainer collets with a little magnet.
Now it's time to expand my vocabulary by learning new terms like Thrust Face, Ring end gap, and such.
Scout63:
Looking good Mark.
LesP:
Fantastic :thumb:
There are a few types of folk in the world, those who don't know that.. If ifs and buts were candy we would all have a merry Christmas, those that just have a crack at it and probably some others.
Anyone who has a go gets my vote. :thumb: :thumb:
Brilig:
Time to remove the crankshaft nut.
That took a while but now I have a tool for my next rebuild project! :thumb:
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