Topic: Esquire: This is your brake caliper

[fmctm1sw]

I couldn't figure out how to attach a photo in a PM...  I got your caliper disassembled this evening.  It was definitely stuck but moved freely as I moved it further and further out.  The piston looked a lot better than I expected.  The picture makes it look worse than it is, just a couple small pits in it.  That's right out of the caliper, not wiped or cleaned or anything.  I'm going to need to clean the caliper itself and I'd recommend a new caliper seal since we have it apart.  I thought I had one one my shelf but I didn't.  Just a couple dollars, I got mine at Honda Motorsports.  That's the good news.  The bad news is the master cylinder is seized too and I doubt it's going to be able to be "unstuck."  No idea yet if the lines themselves are clogged either.  Some may disagree on the piston but in my opinion, we got to it in time to save it.  And, in the end, if it leaks were looking at under $40 for a piston from Kevin400F anyway.  Master cylinder kits are $25 to $50 depending on whether you buy a "Honda" one or aftermarket.  I have one but it's for a 750...

[esquire]

Thanks! I'll go ahead and buy a master cylinder rebuild kit and the caliper seal. What's the best source for the master cylinder kit?

I was planning on getting some new brake lines anyway, so I may go ahead and order those too.

EDIT: It looks like the master cylinder kit might be the same for 750 or 350. The official Honda kit I'm looking at on Ebay right now says it's compatible with CB750s through 1976 in addition to CB 350F. If it's the same kit you have, I could order it and give that to you when it comes in.

The one I just found:
http://www.ebay.com/itm/Honda-CB350-CB350F-CB400F-CB750F-master-cylinder-kit-/400246959926?pt=Motorcycles_Parts_Accessories&vxp=mtr&hash=item5d3093ef36#ht_626wt_1037

[fmctm1sw]

EDIT: It looks like the master cylinder kit might be the same for 750 or 350. The official Honda kit I'm looking at on Ebay right now says it's compatible with CB750s through 1976 in addition to CB 350F. If it's the same kit you have, I could order it and give that to you when it comes in.

The piston in that kit I have is larger than the piston in the 350F master cylinder.  I ended up having to buy a another master cylinder (from someone on here I think)..

*edit*  I did some reseach on the master cylinders.  There is definitely a confusion factor (for me at least) when it comes to these.  This is how the parts fische breaks them down.  Note how the 550K2 (76) is assigned BOTH master cylinder part numbers.  I'm certain there are different piston sizes involved.  I can't remember where I got my 750 kit from... 

45500-369-671
CB350F A MOTORCYCLE, JPN, VIN# CB350F-1000001
CB350F1 A MOTORCYCLE, JPN, VIN# CB350F-2000001
CB350G A MOTORCYCLE, JPN, VIN# CB350-5000001
CB360 A MOTORCYCLE, JPN, VIN# CB360-1000001
CB360G A MOTORCYCLE, JPN, VIN# CB360-1000001
CB360T A MOTORCYCLE, JPN, VIN# CB360-2100001 TO CB360-2123938
CB360T A (76) MOTORCYCLE, JPN, VIN# CB360-2200001
CB400F A MOTORCYCLE, JPN, VIN# CB400F-1000006 TO CB400F-1038492
CB400F A (76) MOTORCYCLE, JPN, VIN# CB400F-2000001 TO CB400F-2008280
CB400F A (77) MOTORCYCLE, JPN, VIN# CB400F-2100001 TO CB400F-2104166
CB450K5 A MOTORCYCLE, JPN, VIN# CB450-5000001 TO CB450-5040742
CB450K6 A MOTORCYCLE, JPN, VIN# CB450-6000001 TO CB450-6025991
CB450K7 A MOTORCYCLE, JPN, VIN# CB450-7000001 TO CB450-7022920
CB500T A MOTORCYCLE, JPN, VIN# CB500T-1000001
CB500T A (76) MOTORCYCLE, JPN, VIN# CB500T-2000001
CB550F A MOTORCYCLE, JPN, VIN# CB550F-1109886
CB550F A (76) MOTORCYCLE, JPN, VIN# CB550F-2000003 TO CB550F-2010866
CB550K A (76) MOTORCYCLE, JPN, VIN# CB550K-1230001

45500-341-771
CB450K3 A MOTORCYCLE, JPN, VIN# CB450-4000001
CB450K4 A MOTORCYCLE, JPN, VIN# CB450-4100001
CB450K5 A MOTORCYCLE, JPN, VIN# CB450-5000001 TO CB450-5040742
CB500 A MOTORCYCLE, JPN, VIN# CB500-1000001
CB500K1 A MOTORCYCLE, JPN, VIN# CB500-2000001
CB500K2 A MOTORCYCLE, JPN, VIN# CB500-2100001
CB550 A MOTORCYCLE, JPN, VIN# CB550K-1000001
CB550K A (76) MOTORCYCLE, JPN, VIN# CB550K-1230001
CB550K1 A MOTORCYCLE, JPN, VIN# CB550K-1200001
CB750A A (76) MOTORCYCLE, JPN, VIN# CB750A-7000001 TO CB750A-7007331
CB750F A MOTORCYCLE, JPN, VIN# CB750F-1000002 TO CB750F-1015054
CB750F A (76) MOTORCYCLE, JPN, VIN# CB750F-2000003 TO CB750F-2022317
CB750K A (76) MOTORCYCLE, JPN, VIN# CB750-2540001 TO CB750-2575894
CB750K0 A MOTORCYCLE, JPN, VIN# CB750-1000001
CB750K1 A MOTORCYCLE, JPN, VIN# CB750-1044650
CB750K2 A MOTORCYCLE, JPN, VIN# CB750-2000001
CB750K3 A MOTORCYCLE, JPN, VIN# CB750-2200001
CB750K4 A MOTORCYCLE, JPN, VIN# CB750-2300001
CB750K5 A MOTORCYCLE, JPN, VIN# CB750-2500001

45500-404-671
CB550F A (77) MOTORCYCLE, JPN, VIN# CB550F-2100001 TO CB550F-2114871
CB550K A (77) MOTORCYCLE, JPN, VIN# CB550K-2000007 TO CB550K-2015308
CB550K A (78) MOTORCYCLE, JPN, VIN# CB550K-2100001 TO CB550K-2122082
MT125R A (78) MOTORCYCLE, JPN, VIN# 125R2F-1081

[esquire]

I'll put in an order for the part, then.

[fmctm1sw]

Here's an after photo of your caliper for your files... 

[esquire]

Here's an after photo of your caliper for your files...

That looks great.

[ekpent]

Feel kind of funny reading this,like I am peeking into someones window late at night-------  

[esquire]

Feel kind of funny reading this,like I am peeking into someones window late at night-------  

fmctm1sw is a true lover of SOHC bikes.

[fmctm1sw]

  It is kind of weird.  I started it just to show a photo since I didn't have an email address for Esquire.  Just kind of grew from there.   

As mentioned in the PM, here's the solved mystery of the oil light.  I also cleaned up a bit under the sprocket cover.  There was some really sticky brownish stuff under there.  Perhaps old gas?  Like said, compression was real good.  A good fuel system cleaning should have you a well running bike.  I'd get new tires though before you rack up any real mileage on it...