Author Topic: 1976 CB750F help! (Read 3191 times)

flyboy245 · « **Reply #25 on:** February 24, 2015, 08:29:48 PM »

Ooh. Good point. Either way, I'm gonna wait till it gets above 30 outside. Also until I have brakes, which again brings me to ask if anyone know of any cheap used front calipers for a 76 cb750f. Thanks everyone!

Jerry Rxman Griffin aka MuthaF'er · « **Reply #26 on:** February 24, 2015, 10:04:15 PM »

Quote from: flyboy245 on February 24, 2015, 07:27:42 PM

As soon as it warms up a little, I will definitely give it a try. I might see if I can get one or two of my idiot friends to push me. Also, I finally managed to get the piston out of the brake caliper, only to find that the bore of the caliper was rusted. So, does anyone know where I can find a front brake caliper for REALLY cheap. I don't need the guts of it, as mine are usable, so just the body. Any leads would be GREATLY appreciated.

Check in with Bill Benton. Aluminum does not rust?

flyboy245 · « **Reply #27 on:** February 25, 2015, 06:25:17 AM »

Sorry, I misspoke when I said that the bore was rusted. I meant to say that there was some corrosion and pitting. Not sure if that would affect the seal with the piston. Also, my piston does have a bit of pitting on it, so I'm going to end up replacing it. Any other suggestions?

Gooseman · « **Reply #28 on:** February 25, 2015, 07:08:08 AM »

The internal bore of the caliper should be fine as long as you clean and polish it well. Be sure to get the groove where the seal seats super clean!

If your piston is pitted, I would recommend recommend picking up a reproduced 304 stainless piston like these if you can swing one:
http://www.ebay.com/itm/Honda-CB-750K-750-K-CB750K-1977-1978-brake-caliper-piston-stainless-steel-/231473124637?pt=Motorcycles_Parts_Accessories&hash=item35e4df951d&vxp=mtr

martin_uk · « **Reply #29 on:** February 25, 2015, 07:15:40 AM »

The deposits are usually corrosion from water that is absorbed into brake fluid.

The corrosion in the seal groove is the main cause of pistons not retracting as pressure is taken off when brake released.

I usually use an a shaped tool to scrape out and finish off with 3m type abrasive pad, cut to allow it to be pushed into groove as you turn.

Make sure you clean carefully blow out with compressed air then with brake cleaner and paper towel, then brake fluid on internal areas and use special brake rubber grease on seal as petroleom based grease will swell the seals.

flyboy245 · « **Reply #30 on:** March 03, 2015, 07:06:54 AM »

Well, the front brakes are all together after rebuilding both master cylinder and caliper, but the master cylinder still seeps a bit. Any ideas? But that's not my biggest concern right now. I bought anew headlight bracket and put everything on, but it seems like my headlight is on upside down, as the hole for the wires is up near the top, making it very difficult to get them in there. But, the cutout for the turn signal buzzer is on the correct side, so I'm not sure if this is correct or not. Also, I am planning to powder coat my triple tree clamps, but I only have a vague idea on how you would go about doing it. Any suggestions on all my issues?

Jerry Rxman Griffin aka MuthaF'er · « **Reply #31 on:** March 03, 2015, 01:30:58 PM »

We can not see what you are seeing. Pictures! use photobucket. free. copy and paste the 'img' code.

flyboy245 · « **Reply #32 on:** March 03, 2015, 01:40:17 PM »

Well, thanks for the help, but the mc is leaking by the handle, so I don't know what's up. As for the triple tree, I was mainly wondering if there is any way to get the steering stem out of the lower clamp, or if I will just have to be careful about it. I will have pictures of the headlight tonight.

flyboy245 · « **Reply #33 on:** March 03, 2015, 09:15:18 PM »

Ok cool. And here's a quick picture of my headlight issue. It appears that I just have far too big of a headlight bucket somehow, as it is bumping into the bracket. Also, all the markings are upside down. And no, it does not fit the other way around. Tried already. Far too many times than I'd like to mention, actually.

flyboy245 · « **Reply #34 on:** March 03, 2015, 09:44:45 PM »

Oh f$#%ing bull?@$&. My headlight burnt out. And me, being the naive little diptard I am, thought "Oh well, I can get a new bulb!" Not realizing its sealed. So, I am pretty frustrated and I could use your guys' help. I need to find a full headlight assembly that will fit with my bracket, as I REALLY want to use the stock bracket. Otherwise, my day was pretty frustrating. School sucks, my spring break plans got canceled, and my bike just sucker punched me in the nutsack (both physically and metaphorically). Oh and guess what? Turns out my freshly rebuilt master cylinder likes to leak out of both ends! Joyous joy! That being said, I did polish and rebuild one of the forks, and it looks very nice, but otherwise this day was a monumental waste of time, effort, and my decreasing sanity. I'm sorry if I sound like a whiny little turd, but I just needed to say that to feel a bit better. Hopefully I will have better posts in the next couple days. Hope you guys had a better day than me.

goldarrow · « **Reply #35 on:** March 03, 2015, 10:02:08 PM »

The bucket in the picture does look like it's upside down.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #36 on:** March 03, 2015, 10:40:54 PM »

Yeah but it's too cold, too dark and too late in my garage to double check right now. What imprints does your bucket have? That'll be the telling. If you need another bucket you can find NOS ones on EBay as a 500T bucket.

Jerry Rxman Griffin aka MuthaF'er · « **Reply #37 on:** March 04, 2015, 11:42:19 AM »

The correct bucket is HM32M-S. That is located under the hole for the mount on the side.

flyboy245 · « **Reply #38 on:** March 06, 2015, 01:05:28 PM »

Yeah, turns out the PO got the wrong headlight for it. just ordered a new one today. I had a rather funny moment, though, in that when i was looking for a new bucket online, I came across one that said it fit both my 750f and a 79 gl1000. Checking up on this, it turns out that the 79 gl1000 front end is quite similar to mine. This isn't the funny part, though. The funny part is that for the past 3 weeks, while I freaked out over the front end, there was a 79 gl1000 LITERALLY

flyboy245 · « **Reply #39 on:** March 06, 2015, 01:10:19 PM »

Whoah, that was wierd. Got cut off... Anyway, there was a 79 GL1000 LITERALLY sitting within a foot of my bike. I was actually bumping into the solution for some of my problems for 3 weeks and I didn't even realize it! XD Gotta love it

martin_uk · « **Reply #40 on:** March 10, 2015, 09:34:27 AM »

Bit late for you as already ordered, but this seems a good price

http://www.ebay.co.uk/itm/New-Genuine-Honda-7-Sealed-Beam-Headlight-CB450-CB500-CB550-CB750-GL1000-a45-/271800875277?pt=Motorcycles_Parts_Accessories&hash=item3f4898390d

flyboy245 · « **Reply #41 on:** March 10, 2015, 05:32:06 PM »

Yeah but from the UK shipping is like twice the price of the part. I appreciate you finding this, though, because every little bit helps! As for a status update, both forks are completely done, as noted by the picture, and I got the steering column apart, cleaned, and just about ready to powder coat, along with the kick stand and center stand (they were a bit rough). Now, I ordered an all balls bearing kit, but I heard conflicting rumors about whether you need to grind down the ridge on the steering head nut (or whatever the heck its called). Any suggestions?

oldhatt45 · « **Reply #42 on:** March 10, 2015, 07:14:21 PM »

flyboy245,

Read the attached. It explains how to do the tapered bearing change out.

Charlie

martin_uk · « **Reply #43 on:** March 11, 2015, 03:23:51 AM »

Quote from: flyboy245 on March 10, 2015, 05:32:06 PM

Yeah but from the UK shipping is like twice the price of the part. I appreciate you finding this, though, because every little bit helps!

I dont think Everett, Washington, United States is in UK

flyboy245 · « **Reply #44 on:** March 11, 2015, 07:08:40 AM »

Oh haha! I assumed that since it was on eBay UK, it was coming from the UK! Whoops! And thanks for that file, Charlie, it made everything crystal clear.

flybox1 · « **Reply #45 on:** March 11, 2015, 08:53:37 AM »

Quote from: martin_uk on March 11, 2015, 03:23:51 AM

Quote from: flyboy245 on March 10, 2015, 05:32:06 PM
Yeah but from the UK shipping is like twice the price of the part. I appreciate you finding this, though, because every little bit helps!

I dont think Everett, Washington, United States is in UK

This vendor, Everett Powersports, is a stones throw from me. Good people. Surprising the amount of NOS SOHC Honda inventory they have hiding there. A local rider w/ a CB550 here picked up a complete original exhaust for his resto they had in their parts warehouse.

flyboy245 · « **Reply #46 on:** March 14, 2015, 08:10:22 PM »

Haha! It ran! And drove! My dad took it up and down the street and it appears to be in relatively good working order. I just got the front end back together last night after I powder coated the steering head. I opted to go for flat black, as the frame isn't all that glossy anymore and I wanted to match. Looks nice. While it does run, I'm having a few issues, however. First of all, it has a very erratic idle speed. Secondly, it bogs down if you jam on the throttle too quickly. Last, cylinders 1 and 3 are running hot, while 2 and 4 are hardly warm at all, like they are only running half the time, which would definitely explain the weird idle. Any ideas? Just for information, I cleaned the carbs last week, and I'm running it with a VERY dead battery and jumping it off of a car (not sure if this would affect anything). Also, I haven't done a compression test yet, but I will do one soon.

flybox1 · « **Reply #47 on:** March 14, 2015, 08:31:49 PM »

Complete ALL 3000mi tuneup items and finish it off with a vacuum sync of the carbs. 90% of your issues will disappear if you do these items properly.

These bikes prefer ultra-clean carbs. Redo them of you think you half@$$'d it!!!

flyboy245 · « **Reply #48 on:** March 15, 2015, 10:50:03 AM »

Doi! I completely forgot to sync them! That might definitely help

. And yes, I will go through the checklist again just to double check.

flyboy245 · « **Reply #49 on:** March 17, 2015, 08:10:59 PM »

Haven't had a chance to run it again, but I have been slowly working on making it look a bit prettier. 30 years of crud does NOT like to come off easy, though... Anyway, I thought you guys might enjoy this picture a bit. I got hungry while prepping my steering head bearings. I ended up with bearing-flavored pizza and a pizza-flavored bearing. Not bad, actually...

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Author Topic: 1976 CB750F help! (Read 3191 times)