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"I really hope you guys can give a hand."

"I own a 1977 CB 550 SS which I'm looking to rebuild into a Cafe-racer. Something along the lines of a Matchless G-50. Although it will be imposable to get it to look just like a G-50, I want something with the same look."

"Some history on my bike. I bought it about 5 years ago, just as I left high school. I have always had a thing about pre-70 bikes. So when I heard about my bike, I jumped at the chance to buy it. I paid R2000 ($275) for her. Visually she was beautifully stock. The engine was dead though. I spent a further $250 on fixing the motor. After the original fix-up, she never gave any problems even though I drove her for daily transport. It stayed like this for 2 years. We moved to another town, And since I didn't have anyspace to work on the bike myself, I took her in for a service. Let's just say that from there on in, it has been nothing but problems. After about a year of overheating, timing problems and oil-leaks. She went and died on me. The electronics burnt out and although I got her running, when ever you placed any amount of load on the engine she would stall."

"This is now two years later, and finally I have enough room to strip her and rebuild the motor. And the terror that awaited me once I got the head off was boundless."

"Instead of replacing the oil-line o-rings between he head and cylinder block, the guy that worked on my bike simply replaced the worn-out o-ring and added some red-rubber gasket maker. It clogged up the oil-port between the engine block and cylinder block. Getting down to the crank, there were little damage to the white-metal bearings. But the bearings on the conrods where almost total worn out."

"I'm not rebuilding the motor from the bottom up, using a 'new' manual as reference."

"But what need to know how I can lower the bike. I have already dropped the front of the bike by adjusting the clamp height of the double T's. But this is too little. And I'm at a loss concerning the rear. All I can think off is getting a spring maker to coil me a new shorter set."

"Any help will be appreciated."
 

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With an engine that has been trashed like that one, throw it out and find another one. Don't bother rebuilding it, it'll cost more than a decent running used engine.
 

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Check with Progressive Suspension or Works Performance, they both make rear shocks in different lengths to your specifications.

It's a little tougher lowering the front, you generally have to disassemble the forks and modify the damping rods and/or install shims.

In either case you don't want to just shorten the springs without modifying the shock/fork suspension travel.

FR
 

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Discussion Starter #6
quote:Check with Progressive Suspension or Works Performance
"I'm in south Africa so that cold be a problem."

quote:have shorter shocks made.
"Can I just get shorter springs, or will that mess with the dampaning?"

<pre id=code>With an engine that has been trashed like that one, throw it out and find another one. Don't bother rebuilding it, it'll cost more than a decent running used engine.</pre id=code>
"Damage on the engine is a follow."
1. Conrods (Piston 3) destroid the bearings and seat area on crank. Have to regrind and have new white metal bearings made.

2.Also lost top ring on piston 3.

3.Primary drive chain ate about 2mm out of the bottom of the block. But didn't damage the oil line coming from the filter.

4.Timing chain guide (the on mounted on the inside of the chain) has a little bit of damage.

5.Need new head gasket, i think. I always replace the head gaskets when rebuilding.

As for getting a new motor that might be problem considering that I paid $ 150 for a secondhand head a jear ago and that I'm only paying $70 to regrind the cranck."

"I'm also thinking of getting a lower profile tire for the front, instead of working o the forks. I found a old picture ofthe bike, when she was stil running. Will post."
 

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Discussion Starter #7
OK, Just got of the phone with just about the only place that still have lost of parts for these old bikes in SA.

Tell me what you guys thing abut the prices.
* GASKET SET $120
* PRIME. Drive chain $70
* Timing chain Guide $21
* Complete CB550 engine $650 (That's about two month's pay<img src=icon_smile_sad.gif border=0 align=middle>)
* Complete CB750 Engine $790

Do any one know what pressure on the outlet of the oilpump should be?


Edited by - Ruin on Jun 02 2005 05:02:06 AM
 

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Discussion Starter #8
Picture of a low rez picture. Just before she went in for the 'service'. Please note that she red and not yellow. The printer ran out of red while printing.

 

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quote:
OK, Just got of the phone with just about the only place that still have lost of parts for these old bikes in SA.

Tell me what you guys thing abut the prices.
* GASKET SET $120
* PRIME. Drive chain $70
* Timing chain Guide $21
* Complete CB550 engine $650 (That's about two month's pay<img src=icon_smile_sad.gif border=0 align=middle>)
* Complete CB750 Engine $790
Gasket set looks a little high, but the chains look to be about what I've seen. Then engines.... I guess we just have a ton of motorcycle junk yards around here...

quote:
Do any one know what pressure on the outlet of the oilpump should be?
No idea.
 
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