Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 237044 times)

edwardmorris · « **Reply #875 on:** April 11, 2015, 07:44:02 pm »

The crank oil drain caps got new o-rings and torqued down. Was installing the NOS primary tensioner and realized I don't have an extension for the 1/4" torque wrench, so decided to tighten it in place for now, then surprise! my trusty Carftsman set already had one

edwardmorris · « **Reply #876 on:** April 12, 2015, 11:41:27 am »

Quick Q: Neither my K2 nor my K3 have item #15 spline washer on the clutch. Should I worry?

http://www.cmsnl.com/honda-cb750k2-four-usa_model14362/partslist/E09.html#results

edwardmorris · « **Reply #877 on:** April 12, 2015, 02:25:09 pm »

Started a thread about it here, looks like cases won't be going back together today

Apparently something changed with the K2 about that splined washer, but can anyone with a K1 confirm that the K1s had it? I think I've got one of the left over K1 engines so its possible mine's a K1 clutch and primary shaft. I'll dig through some pix to see if the primary shaft has a groove for it (don't recall seeing it).

Moving on, I started mocking up the trans after I finished installing the kickstart assembly. I know there's supposed to be about 1mm gap on the last two gears, but mine seems to be a tad more. Also noticed there's about 1mm or more on the shaft spline itself where the spacer goes. Is this normal or is something off? I'll try and check the gaps again with the shifter forks in place.

Davez134 · « **Reply #878 on:** April 12, 2015, 02:27:58 pm »

I wish I could tell you what the tolerances are for movement in that last picture. I do know on mine, there was VERY little side to side after putting that clip on. Also the gap in your first picture looks fine to me, but again do not have any exact numbers to go by. Wish I could be of more help, I want you to get this thing done!

edwardmorris · « **Reply #879 on:** April 12, 2015, 02:45:23 pm »

Quote from: Davez134 on April 12, 2015, 02:27:58 pm

I wish I could tell you what the tolerances are for movement in that last picture. I do know on mine, there was VERY little side to side after putting that clip on. Also the gap in your first picture looks fine to me, but again do not have any exact numbers to go by. Wish I could be of more help, I want you to get this thing done!

Me too! I have it all here, wanted to wrap up the bottom end today and the top end by mid week

I tried this: Once the C4 is fully engaged, there is no side to side movement and the gap between the C1 and drive gear is almost exactly 1mm. Call it good?

Davez134 · « **Reply #880 on:** April 12, 2015, 03:24:59 pm »

That's what mine was like, shifts smooth, no resistance or noises.

edwardmorris · « **Reply #881 on:** April 12, 2015, 04:12:50 pm »

Cool, I'll leave the counter shaft as is for now, thanks!

Back to the damned clutch, I take back my earlier post, the K3 DOES have that splined washer on it. Somehow its missing on the K2, and I don't have a definitive way to confirm if it can live without it. I'll wait for Mark or Terry to swing by. It wasn't there when I tore it down, and I followed this article at the time. The article makes no mention of it either so I never bothered to check. Just saw it today on the fiche AFTER I torqued it all down and bent new tabs

http://www.salocal.com/sohc/tech/clutch/cth4.htm

jerry h · « **Reply #882 on:** April 12, 2015, 06:46:55 pm »

Quote

Quick Q: Neither my K2 nor my K3 have item #15 spline washer on the clutch. Should I worry?

Digging through my old pics, mine had #15. Don't think your clutch can live without it. What's one more parts order...

Quote

HondaMan · « **Reply #883 on:** April 12, 2015, 07:32:59 pm »

Quote from: edwardmorris on April 12, 2015, 11:41:27 am

Quick Q: Neither my K2 nor my K3 have item #15 spline washer on the clutch. Should I worry?

http://www.cmsnl.com/honda-cb750k2-four-usa_model14362/partslist/E09.html#results

Hmm...interesting. That's a drawing of the K0-K1 clutch.
More of the K2 engines came with this clutch (now being called the "K3" version, for whatever reason) than with the K1 type.
http://www.hondaparts-direct.com/fiche_section_detail.asp?section=2560020&category=Motorcycles&make=Honda&year=1973&fveh=132837
(Hint: click on the "PRINT" instruction for a full-page view.)
The splined washer is the spacing for the basket vs. hub.

edwardmorris · « **Reply #884 on:** April 12, 2015, 08:08:02 pm »

Jerry! Glad your still subscribed! Yep, looks like I'll need one, thanks Mark, for confirming as well!

Got some lead on a replacement, but if I make time before it arrives, I'll redo the clutch basket using the one from my K3. Since things have been delayed a bit, went ahead and ordered some F2 connecting rod bolts and nuts as well. The old ones went on fine but just didn't "feel" right (hard to explain). Work's been killing me with scheduling all over the place, so I think I'm just going to have to insist on some time off and get the engine done. Rest of the stuff shouldn't require as focused an effort (hopefully).

HondaMan · « **Reply #885 on:** April 13, 2015, 06:17:26 am »

Quote from: edwardmorris on April 12, 2015, 02:25:09 pm

Started a thread about it here, looks like cases won't be going back together today Apparently something changed with the K2 about that splined washer, but can anyone with a K1 confirm that the K1s had it? I think I've got one of the left over K1 engines so its possible mine's a K1 clutch and primary shaft. I'll dig through some pix to see if the primary shaft has a groove for it (don't recall seeing it).

Moving on, I started mocking up the trans after I finished installing the kickstart assembly. I know there's supposed to be about 1mm gap on the last two gears, but mine seems to be a tad more. Also noticed there's about 1mm or more on the shaft spline itself where the spacer goes. Is this normal or is something off? I'll try and check the gaps again with the shifter forks in place.

If that C4 and idler gear are backward (either or both) then they drag on each other. That's the clue something is awry.

I've seen recently a gearbox where the splined washer AND the cupped washer were missing, poor guy. Some 'chopper shop' had [re]built his bike, they said, just before he bought it 20 years ago. He rode it for 5 years, struggling with a no-shift-if-sitting-still-or-moving-slowly scenario, thought it was normal. Parked the bike, eventually pulled the engine and sent it to me for general rebuild, as it ran poorly. When I got into it, I ended up with a whole sheet of notebook paper, single-line-ruled, one item per line, of parts missing or assembled wrong inside. Somehow it still ran!

(He sure likes it better now!)

edwardmorris · « **Reply #886 on:** April 15, 2015, 08:06:56 pm »

Little time, little progress, but keeping at it. Swingarm was rebuilt by Mark, then powder coated and put away. Installed new bushings Uncle Tez style

BTW where is uncle Tez?

edwardmorris · « **Reply #887 on:** April 16, 2015, 11:40:11 am »

SOOOOOO glad I caught this before I forced the damned 22s in this weekend, local honda guy has them, will pick em up.

http://forums.sohc4.net/index.php/topic,146871.msg1672085.html#msg1672085

Davez134 · « **Reply #888 on:** April 16, 2015, 04:33:47 pm »

Yep, had to cut mine down.

edwardmorris · « **Reply #889 on:** April 16, 2015, 11:06:09 pm »

First of the two steps back done, rods got all new F2 bolts and nuts. Still waiting for the splined washer to arrive, might just use my K3 one and knock that out tomorrow.

edwardmorris · « **Reply #890 on:** April 17, 2015, 07:14:46 pm »

Clutch washer still hasn't arrived, just used the K3 one and moved on for today, clutch apart and back together. Crankcases got brand new pins, primary chains and timing chain. Soaked them up in oil before threading the crank through.

edwardmorris · « **Reply #891 on:** April 17, 2015, 07:17:30 pm »

All new bearings and o-rings and seals

Restoration Fan · « **Reply #892 on:** April 17, 2015, 07:37:23 pm »

Raphi,
I saw your new head tonight.

Bill and Trey were getting ready to remove the heavy-duty, racing valve springs from it. It's a good looking piece!

edwardmorris · « **Reply #893 on:** April 17, 2015, 08:00:10 pm »

Quote from: Restoration Fan on April 17, 2015, 07:37:23 pm

Rafi,
I saw your new head tonight. Bill and Trey were getting ready to remove the heavy-duty, racing valve springs from it. It's a good looking piece!

FTFY

Its for my K3, I just couldn't bring myself to live with the one damaged fin, so getting that one from Bill.

edwardmorris · « **Reply #894 on:** April 17, 2015, 08:05:01 pm »

Crank got a new seal, bearing groove retainers etc. all in place and just about ready. Near new shifter forks from Bill Benton (super young engine) and a really good later year shifter drum that I got from Stev-o in trade for a Kawi Z1 master. Used a ketchup bottle to generously lube up stuff, then Hondabond time!

Edit: Fixed pic 2

edwardmorris · « **Reply #895 on:** April 17, 2015, 08:06:31 pm »

Love the look of the NOS bolts, forgot to take a pic of the assembly before wrapping it up, coming soon..

evanphi · « **Reply #896 on:** April 18, 2015, 02:55:35 am »

Loooooooookin' good!

Restoration Fan · « **Reply #897 on:** April 18, 2015, 03:56:15 am »

Wow! The engine looks awesome!

Stev-o · « **Reply #898 on:** April 18, 2015, 10:21:27 am »

You get the washer? Shipped it Monday.

Davez134 · « **Reply #899 on:** April 18, 2015, 12:46:51 pm »

Wow! Looks great!!

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Author Topic: 1972 CB750 Four K2 -- Rebuilt to NEW OLD STOCK -- PIX ON PAGE 50 (Read 237044 times)