gpounce
CB750 Member
Hi all,
I'm a Suzi/Yamaha guy but am repairing my friend's '92 CB750. Its the usual sort of thing; he bought the bike in good shape, parks outside uncovered all the time, infrequent maintenance, rides it only the good weather etc. I rescued the bike when it wouldn't start and left him stranded at the bottom of a hill. The bike is in my gazebo & under a cover when I'm not wrenching on it- my R6 lives in the garage
I have the front caliper off- the usual everything frozen, brakes worn beyond belief, tan fluid etc, rusted slider pin and dead seals, and the pistons are stuck. 100psi compressed air isn't enough to move them, I have a removal kit on the way. I tried reconnecting the brake line and using the lever to pump out the pistons but could not get the brakes to bleed and I'm reasonably proficient at it. I used a hypodermic for vacuum alternating with the caliper drain plumbed to a can of waste brake fluid to keep air from coming back in, got lots of bubbles and moved the last of my fluid thru the system but no luck getting air purged. Are the 750's front caliper difficult to bleed or was I just unlucky?
Rear calipers and carbs will come off next, probably will be equally annoying. Tank is off and drained- had to cut the hoses they were so stuck on but no rust, battery is out and in the shop on a tender. My friend related idle/low rpm throttle trouble, I'm assuming the typical filty carbs, we'll see what horrors lurk. I read of a typical update putting a few washers on the carb needles which is fine (I did lots to my old Bandit's carbs), is that a generally desirable mod given un-drilled OEM pipes?
The controls are substantially rusted and sun-faded but nothing too bad, just kind of ugly. No rust under the tank but I'll bet its never been cleaned under there since the bike was new lol. Would much appreciate any suggestions wrt electrical upgrades or other stuff that usually needs overhauling on a poorly maintained stocker.
Thanks!
I'm a Suzi/Yamaha guy but am repairing my friend's '92 CB750. Its the usual sort of thing; he bought the bike in good shape, parks outside uncovered all the time, infrequent maintenance, rides it only the good weather etc. I rescued the bike when it wouldn't start and left him stranded at the bottom of a hill. The bike is in my gazebo & under a cover when I'm not wrenching on it- my R6 lives in the garage
I have the front caliper off- the usual everything frozen, brakes worn beyond belief, tan fluid etc, rusted slider pin and dead seals, and the pistons are stuck. 100psi compressed air isn't enough to move them, I have a removal kit on the way. I tried reconnecting the brake line and using the lever to pump out the pistons but could not get the brakes to bleed and I'm reasonably proficient at it. I used a hypodermic for vacuum alternating with the caliper drain plumbed to a can of waste brake fluid to keep air from coming back in, got lots of bubbles and moved the last of my fluid thru the system but no luck getting air purged. Are the 750's front caliper difficult to bleed or was I just unlucky?
Rear calipers and carbs will come off next, probably will be equally annoying. Tank is off and drained- had to cut the hoses they were so stuck on but no rust, battery is out and in the shop on a tender. My friend related idle/low rpm throttle trouble, I'm assuming the typical filty carbs, we'll see what horrors lurk. I read of a typical update putting a few washers on the carb needles which is fine (I did lots to my old Bandit's carbs), is that a generally desirable mod given un-drilled OEM pipes?
The controls are substantially rusted and sun-faded but nothing too bad, just kind of ugly. No rust under the tank but I'll bet its never been cleaned under there since the bike was new lol. Would much appreciate any suggestions wrt electrical upgrades or other stuff that usually needs overhauling on a poorly maintained stocker.
Thanks!