Topic: performance parts (Pics)

[78 k550]

Hey All,
Are these performance retainers?

Paul

[78 k550]

this cam is it stock?

Paul

[MCRider]

Could be, or just polished stockers. Proof is in the weight.

[78 k550]

I'm tearing into it tonight so I should know more.

Paul

[BLUE71TURBO]

Use a magnet. Stock is steel, aftermarket is either aluminum or titainum and the magnet won't stick to either of those two. 

[Turbogrimace]

Those look like Ti retainers and thats an RC 327 cam.  It's a monster.  

Here's Axel's web page for information on the cam.  

http://www.satanicmechanic.org/rccam.shtml

Looks like you might find some more goodies in there before yo're finished.

[MCRider]

TG is correct. What's the backstory? Is it motor only, come in a chassis, who owned it? That cam implies at least an 836cc kit, head work, maybe rods.

Or maybe just a cam.   

[NitroHunter]

That's bad a$$ stuff there - IF the head can flow it, AND the motor's got enough static compression to compensate for the duration & overlap induced blowdown and low rpm reversion...
But man are they fun when you get it all right.  

[MRieck]

Yes those retainers are Ti and the springs are old RC pieces with the damper spring. That 327 isn't that heavy a cam. I received a Cobra head yesterday for assessment....there are some interesting things I noticed off the bat. I'll tear it down tomorrow night.

[78 k550]

Here is the story.
I always wanted a 750F and local junkyard sold me a titled frame (76) for 150.00 and that night put an add up on craigslist. I posted a  wanted 77-78 parts bike. I got a response that night. 400 no title and said it ran the year before he parked it. let it sit for a year cause 2 carbs where puking fuel. The drain lines where clogged and didn't overflow after the lines where on. Rode it for about 400 miles then had it up to about 9,000 to catch up to someone. Then smelled oil looked down and my knee to my boot was soaked with oil.

so basically got me a bike for around 450.00.

I'm excited to tear into this. Might not be tonight it is getting cold again.

Paul

[MRieck]

Here is the story.
I always wanted a 750F and local junkyard sold me a titled frame (76) for 150.00 and that night put an add up on craigslist. I posted a  wanted 77-78 parts bike. I got a response that night. 400 no title and said it ran the year before he parked it. let it sit for a year cause 2 carbs where puking fuel. The drain lines where clogged and didn't overflow after the lines where on. Rode it for about 400 miles then had it up to about 9,000 to catch up to someone. Then smelled oil looked down and my knee to my boot was soaked with oil.

so basically got me a bike for around 450.00.

I'm excited to tear into this. Might not be tonight it is getting cold again.

Paul

Well at laest some of those parts can be reused. That valve tip looks rough but you really won't know until you pull the rocker arm

[78 k550]

I'll pull them off tomorrow, kinda settled in for the night now.
I hope the previous owner or someone down the line put a kit in it and not just a cam.
After pulling the valve cover. The circled red bolts and nuts where finger loose. 2 I had to use a wrench and they weren't far behind the others.

Paul

[MCRider]

Yes those retainers are Ti and the springs are old RC pieces with the damper spring. That 327 isn't that heavy a cam. I received a Cobra head yesterday for assessment....there are some interesting things I noticed off the bat. I'll tear it down tomorrow night.

Yeah I was looking at the numbers and even tho its the full race RC cam, the lift is only 10thou higher and the duration is the same as the bottom tier street cam I got from webcam for my project.  Course I realize there are differances in how things are measured, but still...

But its all fun. Hope you find good stuff.

[MCRider]

Here is the story.
I always wanted a 750F and local junkyard sold me a titled frame (76) for 150.00 and that night put an add up on craigslist. I posted a  wanted 77-78 parts bike. I got a response that night. 400 no title and said it ran the year before he parked it. let it sit for a year cause 2 carbs where puking fuel. The drain lines where clogged and didn't overflow after the lines where on. Rode it for about 400 miles then had it up to about 9,000 to catch up to someone. Then smelled oil looked down and my knee to my boot was soaked with oil.

so basically got me a bike for around 450.00.

I'm excited to tear into this. Might not be tonight it is getting cold again.

Paul

Interesting, wonder why the oil. Also interesting that the heritage of a bike/motor gets lost over time. SOunds like the PO didn't know he had at least a cam in that motor.

[78 k550]

So not knowing much about this engine other than when it ran It Ran pretty good, the 750 for about 400 miles. I started out on a 78 550 then a 72 500 then a 75 Wing and still.
I was just going to change the top end gaskets and call it good.
Should I need to go farther into it then the top end gasket set? I don't think so unless I find problems.

Paul

[78 k550]

I just peeked in. There is slight porting in the head on the intake side.

Paul

[MCRider]

So not knowing much about this engine other than when it ran It Ran pretty good, the 750 for about 400 miles. I started out on a 78 550 then a 72 500 then a 75 Wing and still.
I was just going to change the top end gaskets and call it good.
Should I need to go farther into it then the top end gasket set? I don't think so unless I find problems.

Paul

Have you identified the oil leak?

To your question, I vote that you do as little as possible to get it back on the road. There's too many engines on the forum in pieces right now including mine. Fix the oil leak. Make sure the cam chain tensioner is operating properly, maybe replace the rollers.

Then you can study and save up for a bigger rebuild if necessary. If not that'd be good too.
JMHO

[78 k550]

I'm pretty sure it is just the flat puck seal/washer under the cam towers. Look's like everything from valve cover down is soaked.
I have it at TDC on #4 that shouldn't matter as long as it goes back that way correct?

Paul

[MCRider]

I'm pretty sure it is just the flat puck seal/washer under the cam towers. Look's like everything from valve cover down is soaked.
I have it at TDC on #4 that shouldn't matter as long as it goes back that way correct?

Paul

If its the pucks, you'll be removing the cam and cam stands. YOu can retorque the head nuts, put in fresh pucks and o rings and reinstall. TDC on 4 is also TDC on 1, and thats where you want to be.

I'd remove the cam chain tensioner from the back of the block. YOu may need a new gasket. Sometimes the gasket sticks to the tensioner cleanly and you can reuse it.  YOu can disassemble it and make sure it is working smoothly, no indentations on the stem where the lock bolt contacts it. THey often hang up that way. THat will assure quiet running as much as possible with old parts.

To your question, you're right. But you are on TDC 1 so you can use the manual instructions as well.

[Jerry Rxman Griffin aka MuthaF'er]

Is the cam chain sprocket slotted to better time the cam?

Remove the oil pan and check for rods.

[cb650]

The cam gear is slotted.      APP on the head.

[78 k550]

Me and Terry tore into it a little more.

whats this on the head.
not going down any further.

I should pull the pan just to take a peek huh?

Paul

[78 k550]

I tried to get one of the porting.

Paul

[78 k550]

Terry,
Washers are the same size. Look's like we will be going up with it tomorrow.

Paul

[Jerry Rxman Griffin aka MuthaF'er]

Tried to open the port picture to enlarge but wasn't able.

The APP is part of the casting. One of mine has A O. Probably like a casting lot number.

You should pull the pan anyway to "clean the screen", yeah, that's it  . Good enough reason in itself.

Had you done a compression test before? No sense to crack it farther if it's good.