New bike so I'm posting to a few forums to gather the most knowledge possible.
Hello everyone. Just bought a new to me 1981 CB750C. It's not my first carb bike (I mostly ride newer sport bikes) but this is my first old carb bike. I found the bike on craigslist and after a thorough inspection and test ride I brought it home.
Problems at pick up:
Carbs leak out the overflow (Needle and seat probably)
Front tire is cracked (cracked a bunch more on the way home... )
Runs a little rough
Horn barely works
Lever brake light switch not working
And a huge front fairing!
So far I've completed a compression check. Dry 125, 120, 125, 140. Wet 160, 150, 170, 170. After soaking the cylinders in Marvel's Mystery Oil overnight and then running the engine back up to temperature I got some better numbers. Dry 155, 150, 160, 150. I think some previous owner did a valve check because it has dried gasket maker leaking out the valve cover. I believe that's some good numbers so I'll stick with it for now.
I've also done an oil and filter change with the Shell Rotella after adding a bunch of Seafoam and MMO to the crankcase oil and running it for a good fifteen minutes, spark plug swap (looked dark and dry), added some Seafoam and MMO to the gas tank, and swapped the air filter.
My main goal is to remain nearly stock-ish looking and still be able to ride two-up next year. My wife is currently preggo with our first so no riding this year for her. It'll also be a good transportation for me when I go off to military duty all the time on the other side of the state.
To do list:
Brake fluid change
Replace front tire and put balance beads in all the tires. I love this in my sport bike
Rebuild the carbs
Running new lighting after removing the fairing
Swap the cracked coils for some F3 coils and wires
Fix brake lever switch
Reseal the gas tank
Clean up the chain and adjust
Change out the fork oil and adjust the overall height as needed.
Here she is: http://imgur.com/RZoheqX
PJ
Hello everyone. Just bought a new to me 1981 CB750C. It's not my first carb bike (I mostly ride newer sport bikes) but this is my first old carb bike. I found the bike on craigslist and after a thorough inspection and test ride I brought it home.
Problems at pick up:
Carbs leak out the overflow (Needle and seat probably)
Front tire is cracked (cracked a bunch more on the way home... )
Runs a little rough
Horn barely works
Lever brake light switch not working
And a huge front fairing!
So far I've completed a compression check. Dry 125, 120, 125, 140. Wet 160, 150, 170, 170. After soaking the cylinders in Marvel's Mystery Oil overnight and then running the engine back up to temperature I got some better numbers. Dry 155, 150, 160, 150. I think some previous owner did a valve check because it has dried gasket maker leaking out the valve cover. I believe that's some good numbers so I'll stick with it for now.
I've also done an oil and filter change with the Shell Rotella after adding a bunch of Seafoam and MMO to the crankcase oil and running it for a good fifteen minutes, spark plug swap (looked dark and dry), added some Seafoam and MMO to the gas tank, and swapped the air filter.
My main goal is to remain nearly stock-ish looking and still be able to ride two-up next year. My wife is currently preggo with our first so no riding this year for her. It'll also be a good transportation for me when I go off to military duty all the time on the other side of the state.
To do list:
Brake fluid change
Replace front tire and put balance beads in all the tires. I love this in my sport bike
Rebuild the carbs
Running new lighting after removing the fairing
Swap the cracked coils for some F3 coils and wires
Fix brake lever switch
Reseal the gas tank
Clean up the chain and adjust
Change out the fork oil and adjust the overall height as needed.
Here she is: http://imgur.com/RZoheqX
PJ