Useful Idiot
Been Around the Block
Love the idea of engines having their own forum. I'll put the rest of my (re)build in the cafe section. So here goes:
2 seasons ago at a parade my local club was in, my bike puked a ton of oil out of the top of the motor. Not sure what happened. Maybe a return got blocked? I don't know, but I had other bikes to ride so I parked it. Now it's time to rebuild.
Initially I wanted to put a 450 big bore kit in it. Boring the cyls to 73mm, but from researching on the internet it looks pretty involved. You'll need to trim around 2mm off the piston skirts, while keeping the piston weight balanced I'm assuming and raise the head via a copper head gasket. If that will even work since I haven't seen anyone do it.
Looking at the pistons, the 450 is taller and the wrist pin location is higher. From right to left: 500T, 450, 450 black bomber
All this has me kinda thinking about leaving the pistons alone. Just get new rings, hone the cylinders and call it a day. I'd like opinions though. I have a little bit of money and a lot of time to throw at this bike.
That said, if I leave the stock pistons, the motor build would look like this:
1. New rings, hone cylinders
2. Mikuni 30's w stacks.
3. Cam regrind. Mild street cam from Delta Cams.
4. Torsion bars. Not planning on switching to springs, but I don't know of a source for new torsion bars.
5. Valves. Not sure about this one. I'd like new ones, but if my current ones are ok, I'll lap 'em and call it a day (I post pics when I yank the head off)
6. Pamco electro ing. I heard nothing but good things about it.
7. Exhaust. Thinking about a 2 in 1 with a small baffle.
So anyways, enough yapping. Here's some pics.
This is how it sat before the engine with south.
Pulling it apart. Weird thing was, when I removed the last bolt on the right side cover near the oil pump, it 'puffed' some oil out like it was under pressure, even though I had the drain plug out.
Cams coming out.
Intake side out. Notice the right side. Carb not set right?
Exhaust side out.
Intake followers were in pretty bad shape. Not sure if you can see the damage or not.
So the next step is to get the head off and inspect the valves. Order a new cam chain and send the cams out.
Also, I've found some little plastic pieces in the motor, I'm assuming they're from the plastic rings around the cams. Does it hurt anything NOT replacing these?
Does anyone know if you can get your cam followers rewelded and cleaned up?
What about a source for new torsion bars?
My cam chain tensioner sprocket teeth are pretty worn. Do they have aftermarket tensioners?
Thanks to Swagger for already helping me with some of this. More pics as I get further into the motor.
2 seasons ago at a parade my local club was in, my bike puked a ton of oil out of the top of the motor. Not sure what happened. Maybe a return got blocked? I don't know, but I had other bikes to ride so I parked it. Now it's time to rebuild.
Initially I wanted to put a 450 big bore kit in it. Boring the cyls to 73mm, but from researching on the internet it looks pretty involved. You'll need to trim around 2mm off the piston skirts, while keeping the piston weight balanced I'm assuming and raise the head via a copper head gasket. If that will even work since I haven't seen anyone do it.
Looking at the pistons, the 450 is taller and the wrist pin location is higher. From right to left: 500T, 450, 450 black bomber
All this has me kinda thinking about leaving the pistons alone. Just get new rings, hone the cylinders and call it a day. I'd like opinions though. I have a little bit of money and a lot of time to throw at this bike.
That said, if I leave the stock pistons, the motor build would look like this:
1. New rings, hone cylinders
2. Mikuni 30's w stacks.
3. Cam regrind. Mild street cam from Delta Cams.
4. Torsion bars. Not planning on switching to springs, but I don't know of a source for new torsion bars.
5. Valves. Not sure about this one. I'd like new ones, but if my current ones are ok, I'll lap 'em and call it a day (I post pics when I yank the head off)
6. Pamco electro ing. I heard nothing but good things about it.
7. Exhaust. Thinking about a 2 in 1 with a small baffle.
So anyways, enough yapping. Here's some pics.
This is how it sat before the engine with south.
Pulling it apart. Weird thing was, when I removed the last bolt on the right side cover near the oil pump, it 'puffed' some oil out like it was under pressure, even though I had the drain plug out.
Cams coming out.
Intake side out. Notice the right side. Carb not set right?
Exhaust side out.
Intake followers were in pretty bad shape. Not sure if you can see the damage or not.
So the next step is to get the head off and inspect the valves. Order a new cam chain and send the cams out.
Also, I've found some little plastic pieces in the motor, I'm assuming they're from the plastic rings around the cams. Does it hurt anything NOT replacing these?
Does anyone know if you can get your cam followers rewelded and cleaned up?
What about a source for new torsion bars?
My cam chain tensioner sprocket teeth are pretty worn. Do they have aftermarket tensioners?
Thanks to Swagger for already helping me with some of this. More pics as I get further into the motor.