Author Topic: 1974 cb750 fun "Spruce Goose" (STEP 2: frame/suspension) (Read 28368 times)

edwardmorris · « **Reply #75 on:** December 09, 2015, 08:54:42 PM »

Quote from: mashfu on December 09, 2015, 08:41:25 PM

Picked up one when i ordered all the case and rod bearings from yamiya! Next are ball bearings and other little trinkets!

You need to get a hold of jtmarks and save some $$. Check PMs.

mashfu · « **Reply #76 on:** December 12, 2015, 04:40:15 PM »

Worked a bit on the primary sprocket today to get the needle bearings out. When driving the bearings out i managed to knick the shaft. My assumption is that these holes are to pull oil for the teansmission, but im not sure of the impact the knicks may have. Has anyone encountered problems resulting from something like this. It looks like the bearing will seat over the end, but just want to make sure if i can reuse the sprocket or not. They are fairly cheap so replacement is fine but i also wish to learn more.

edwardmorris · « **Reply #77 on:** December 12, 2015, 05:24:16 PM »

Quote from: mashfu on December 12, 2015, 04:40:15 PM

Worked a bit on the primary sprocket today to get the needle bearings out. When driving the bearings out i managed to knick the shaft. My assumption is that these holes are to pull oil for the teansmission, but im not sure of the impact the knicks may have. Has anyone encountered problems resulting from something like this. It looks like the bearing will seat over the end, but just want to make sure if i can reuse the sprocket or not. They are fairly cheap so replacement is fine but i also wish to learn more.

I can't see much in that particular pic, have any others? Also, why are you replacing them? I'm all for new bearings in the engine, but I didn't mess with the needle rollers until 1) I had SKF replacements on hand, 2) My local machinist agreed to change them for me. These tend to be fragile and most likely can't be removed intact. Installing new ones without a proper hyd-press is a bit too risky IMHO.

mashfu · « **Reply #78 on:** December 12, 2015, 06:28:07 PM »

Just took a few more pictures rotating the sprocket.
The reason i wanted to take them off is because while i removed the clutch basket, i saw wood fragments falling into the shaft. Since they fell in i assumed smaller pieces, inevitably, must have fallen in as well and possibly came to rest on the bearings. So just to be safe i felt taking off the needle bearings would be the right choice. I was planning on installing the bearings in the same manner as extracting bearings with the puller mounted on one sprocket side and a fitting to go over the races evenly.

edwardmorris · « **Reply #79 on:** December 12, 2015, 10:44:06 PM »

I could be wrong but I see some nicks on the wall where the needles roll. May not be a deal breaker, but I can't say for sure, maybe ping Hondaman and have him take a look at the pix? Also get a set of replacement SKFs, install once and forget. The bearing number is somewhere in my build thread for the SKF.

mashfu · « **Reply #80 on:** December 15, 2015, 11:26:03 AM »

Got the clutch last night, thought i might measure the plates and see if they are still usable. Measured smallest friction plate to be 3.51mm so i will be using them for at least a little while before changing them.
Also on the topic of the primary sprocket, Hondaman pointed out that damage would inevitably occur to the transmission from the small knicks so i will order a new assay.

edwardmorris · « **Reply #81 on:** December 15, 2015, 12:20:40 PM »

Quote from: mashfu on December 15, 2015, 11:26:03 AM

......Also on the topic of the primary sprocket, Hondaman pointed out that damage would inevitably occur to the transmission from the small knicks so i will order a new assay.

I figured as much, just wanted someone with more than 1 engine of experience to confirm

. Reach out to Bill Benton, he ought to have a replacement from a low miler laying around somewhere at Bill Benton's House of Honda Funland

mashfu · « **Reply #82 on:** December 15, 2015, 12:38:12 PM »

Good catch though! I ordered a set that looks fairly decent, but we will see when it comes; extra just means i can use it on the next project or a keychain

.

mashfu · « **Reply #83 on:** December 18, 2015, 10:47:59 AM »

Today i plan to install the new guides that i got from cyclex, my uncle suggested that i pick up some dry ice to cool them down before i place them into the head. After installation Mike Rieck says the guides need to be honed for proper fitment so i will need to order a tool for that.
Grabbed the final drive out of my pile of parts and will begin soaking them aswell while i go pick up some dry ice. The next few weeks will be picking up orings and dowells and cleaning/plating bolts.

edwardmorris · « **Reply #84 on:** December 18, 2015, 11:01:50 AM »

I forget, did you get Mark's book? If you have the old guides out and aren't sending the head out to JMR/Mark, I highly recommend getting some port clean up done. Remember though, that it is VERY easy to screw up here, go slow and follow the incredibly detailed step by step in Mark's book.

mashfu · « **Reply #85 on:** December 18, 2015, 11:15:23 AM »

I did get a copy of Mark's book, have gone through it and now that you mention it will probably go over that section one more time. Its been an invaluable guide!

mashfu · « **Reply #86 on:** December 18, 2015, 01:07:33 PM »

Removed most of the carbon build up in the exhaust ports to get rid of the debris i am going to rinse in the dish washer and while its nice and warm i will insert guides.

mashfu · « **Reply #87 on:** December 18, 2015, 03:56:52 PM »

Well i installed all four exhaust guides! Woooo but lost 3 guides along the way....
Tried 3 drivers all too small which broke the guides, so out of desperation i used a socket to cup the end of the guide and it worked... Time to ask cyclex if they sell individual guides! If not i will just buy another set and have 5 extra! Unless someone is in need of a few

Restoration Fan · « **Reply #88 on:** December 18, 2015, 06:42:51 PM »

Mash, in those exhaust ports...that copper color you see? That's the copper exhaust gaskets. They used to be round (and need to be again) but they get pressed flat as the pipes are torqued down onto them.

Take a thin, flat blade screwdriver and stick it down there and you will be able to easily pry those out. They're about 1 or 2 mm thick...try prying down from about that distance.

You need to get replacement ones to replace those.
Here's a set on eBay to show you what they should look like:
http://www.ebay.com/itm/4-NEW-COPPER-EXHAUST-GASKETS-SET-HONDA-CB-750-/181937317210?hash=item2a5c4f255a:g:UVkAAMXQxKxSASca&vxp=mtr

Ron

mashfu · « **Reply #89 on:** December 18, 2015, 06:50:18 PM »

Thanks Ron, i was having a go at them earlier with some picks but couldnt get enough leverage to get em out. Ill give it a go with the thin flat blade! I believe there are some gaskets in the yamiya kit that i got.

Restoration Fan · « **Reply #90 on:** December 18, 2015, 06:53:09 PM »

Quite possibly. Mine came in my replacement gasket kit, too although we didn't use the Yamiya kit.

mashfu · « **Reply #91 on:** December 18, 2015, 06:59:27 PM »

Worked like a charm! All four out, and i see four (in a little better shape) in the kit

Restoration Fan · « **Reply #92 on:** December 18, 2015, 07:00:12 PM »

Quote from: mashfu on December 18, 2015, 06:59:27 PM

Worked like a charm! All four out, and i see four (in a little better shape) in the kit

Outstanding. Really enjoying your build! Keep up the great work, man!

mashfu · « **Reply #93 on:** December 18, 2015, 07:08:39 PM »

Thanks, wish i had as many as you do under my belt! Having a blast, a little frustrated at times but love it!

Restoration Fan · « **Reply #94 on:** December 18, 2015, 07:15:17 PM »

Me? I'm a newb. This time last year, Logan and I were sweating through the build of Stella for his high school senior project.
Of course, since that time, I've helped Bill Benton on a couple of his, as well as Mark52 to get his running. And I've been working on this 500 and just getting started with the 550 as well. But I'm an absolute rookie comparative to some of these guys around here.

But you have what it takes: motivation, work effort and desire to ride. Looking forward to seeing yours out on the road. Because I have to admit that this past year was an absolute blast riding Stella.

mashfu · « **Reply #95 on:** December 18, 2015, 07:20:43 PM »

Well, got as much done that i could by hand on the head. Left the intake chambers alone since they looked pretty clean already. Only thing left to do is take them to the car wash and pressure wash the insides out. The dish washer did a decent job on the brunt of it, but there still is some more dirt on the inside. Got off the majority of the gasket from the deck and double checked with a straight edge and feeler gauge.

mashfu · « **Reply #96 on:** December 18, 2015, 07:38:11 PM »

Still jealous hahaha. All your projects just look super fun and i havent even gotten past the engine yet! Its true, compared to some of the guys on here who have many many builds under them, we are rookies but youve finished an entire project and have more going on! Thats what is awesome about you and everyone on here. And i can attest to this, i already feel its never just going to be one!

mashfu · « **Reply #97 on:** December 24, 2015, 08:03:51 PM »

Over the weekend, i picked up an extra head for the 750. Not sure there is much difference (the combustion chambers seem to be a little different) between the two only the fact that the original head i have is an f0 and the one i got i believe is a k4. My hope is to experiment on one and use the other. Dissasembled the head in about 5 minutes as compared to the hours it took me the first try since i actully knew what i was doing this time... From what ive been reading, i could swap the k head onto the f bottom and get some more compression but will it be a significant change? Every swap ive read had been for the later f so im not expecting much. What will definitely happen though is f cam is going in the k head if i do swap.
With this being done is it recommended to also swap rockers or keep the og?
Cleaner head(f0)
Dirtier head(k4ork5?)
I guess the real question is which head should i play around with?

mashfu · « **Reply #98 on:** December 26, 2015, 12:42:42 PM »

Got some playtime in!

BPellerine · « **Reply #99 on:** December 26, 2015, 05:47:53 PM »

try to keep the camtowers and rockers together with the cam you will use,they have worn in together,billp

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Author Topic: 1974 cb750 fun "Spruce Goose" (STEP 2: frame/suspension) (Read 28368 times)