Author Topic: Cafe Project, few questions... (Read 9326 times)

shinyribs · « **Reply #50 on:** June 05, 2012, 06:06:50 PM »

I can't scientifically explain why progressive springs work so well,but it was the best $70 I ever spent on the bike.

They have a portion of the spring where the coils are wound closer. It gives the spring two different zones of strength,basically. Much smoother ride,less bottoming out on heavy bumps and a much better overall feel of the road.

Good luck with your project. I'm anxious to see what all you come up with!

kidrcth · « **Reply #51 on:** June 05, 2012, 06:57:32 PM »

im looking for a firm suspension... are progressives the way to go? i want firm in the rear and firm up front. Im used to sport bikes so i understand comfort is sacrificed.

jaguar · « **Reply #52 on:** June 05, 2012, 07:28:24 PM »

Firm is a subjective term. Bunch of those cheap junk remote res shocks on ebay are "firm". A steel bar is firm too.
As stated in this thread and others here. Call racetech, hagon, works, or progressive.
Inch longer then stock in the rear and GL forks is a nice set up that works. not sure if that will fit with your "look"

shinyribs · « **Reply #53 on:** June 05, 2012, 09:20:05 PM »

In my limited experience with CB's,they all ride firm

There is nothing plush about the ride at all. The progressive springs took mine from what i would call overly harsh down to what i call firm now. it is not an uncomfortable ride,but not Goldwing plush either.

kidrcth · « **Reply #54 on:** June 06, 2012, 03:56:35 AM »

i want to keep the stock mag wheel. i already purchased a 77 cb750f front end anyway. not going to purchase another unless they are inverted.

kidrcth · « **Reply #55 on:** June 06, 2012, 04:37:06 AM »

Got the frame back. Now Allen I gotta do is get it primered

Geeto67 · « **Reply #56 on:** June 06, 2012, 04:47:00 AM »

nothing wrong with a comstar. If I could make a suggestion though a reverse comstar from a 1981-82 cb750F DOHC is a slightly better wheel.

kidrcth · « **Reply #57 on:** June 06, 2012, 05:15:58 AM »

yeah i saw the reverse ones, i actually like the ones i have a little better in black powdercoat. You shall see soon enough. I have one of my guys going to get me some primer for the frame as we speak...

shinyribs · « **Reply #58 on:** June 06, 2012, 04:53:45 PM »

Personally,I prefer the early Comstars,too. They look more modern than the later ones...which is strange?

But they can look very much 'right' on a Cafe style build,too. Glad to see someone is going with Comstars on a Cafe,actually,and not another set of shiny spokes on black rims ( even though it does look killer). I'm anxious to see what you come up with. Keep thinking original!

Mercutiojb · « **Reply #59 on:** June 08, 2012, 01:23:08 PM »

Are those a direct bolt-on replacement?

Quote from: Geeto67 on June 06, 2012, 04:47:00 AM

nothing wrong with a comstar. If I could make a suggestion though a reverse comstar from a 1981-82 cb750F DOHC is a slightly better wheel.

shinyribs · « **Reply #60 on:** June 08, 2012, 06:38:49 PM »

I just put a SOHC Comstar on an '81C front end. You have to fiddle with the spacing,but the axle diameters are the same. Rotors lined up,too.

Geeto67 · « **Reply #61 on:** June 09, 2012, 05:06:32 AM »

Quote from: Mercutiojb on June 08, 2012, 01:23:08 PM

Are those a direct bolt-on replacement?

Quote from: Geeto67 on June 06, 2012, 04:47:00 AM
nothing wrong with a comstar. If I could make a suggestion though a reverse comstar from a 1981-82 cb750F DOHC is a slightly better wheel.

If you have an F front end they are. the front comstar on my 1978F and my old 1979 F were identical, and I used to have a 1981 comstar that I used on both before throwing it up into the attic. I am working on 1980's interceptor wheels on my 78 right now (16" front 18" rear), I'll let you know how it turns out.

I saw someone on this board has VF1000R star style comstars (16" front 17" rear) on a SOHC. I know they are a direct fit for the DOHCs.

here is a good tip - the 1981-82 rotors have extra cooling vents around the inside diameter of the disc. They are lighter, and less prone to warping, plus they look the part, and are a direct replacement if you already have the comstar front end on a SOHC:

1981-82 rotors:
http://www.ebay.com/itm/HONDA-1981-CB750-CB750F-CB-750-FRONT-BRAKE-ROTORS-/380445753408?hash=item5894558040&item=380445753408&pt=Motorcycles_Parts_Accessories&vxp=mtr

for comparison the 1979-1980 rotor:
http://www.ebay.com/itm/Honda-CB750F-79-80-GL1100-80-81-front-brake-rotor-either-side-/330527253900?hash=item4cf4f5a58c&item=330527253900&pt=Motorcycles_Parts_Accessories&vxp=mtr

if switching to the 81-82 rotors you may need to check which calipers you are using. If you are using the 1977-1980 single puck it may interfere with those vents are prematurely wear down your pads. If you are using the 1981-82 dual piston calipers then you are super groovy because they you have better brakes and a better rotor.

Geeto67 · « **Reply #62 on:** June 09, 2012, 05:14:09 AM »

the brake setup I would like to figure out is how to get a CBX pro-link rotor and calipers to work with the SOHC 77-78F forks. If you haven't seen a cbx prolink rotor this is what it looks like:

http://www.ebay.com/itm/1982-HONDA-CBX1000-CBX-1000-CBX1050-SUPER-SPORT-1050-20-front-brake-rotors-NIce-/320920728630?hash=item4ab85db436&item=320920728630&pt=Motorcycles_Parts_Accessories&vxp=mtr

vented between the brake surfaces like a car rotor. heavy and def overkill but kinda cool. however, the best way to improve braking is to lower rotational mass as well as mass overall so I am not working that hard on fitting these to a SOHC.

jaguar · « **Reply #63 on:** June 09, 2012, 11:11:55 PM »

I wonder if the CBX rotors could be made to work
You would need to use the CBX calipers as they are much wider casting to clear the rotor.

kidrcth · « **Reply #64 on:** June 11, 2012, 05:55:23 AM »

Been busy since last week, should show some progress tomorrow.

Browneye · « **Reply #65 on:** September 24, 2012, 09:20:18 PM »

So, what happened here? This project die?

kidrcth · « **Reply #66 on:** October 06, 2012, 12:47:24 PM »

project very much still being built... negative feedback kinda made me stray away from posting updates... ill update when i get home from work tonight

Duke McDukiedook · « **Reply #67 on:** October 06, 2012, 02:06:56 PM »

Quote from: roach carver on June 05, 2012, 05:15:49 PM

I think the emulators are used with straight rate springs not progressives. Consult race tech.

+1. If you plan on putting emulators in the stock forks you want single rate springs.

kidrcth · « **Reply #68 on:** October 06, 2012, 03:00:54 PM »

I got my Benjie Tank/Seat Combo Finally...

in the back ground u can see a lot of work is happening

kidrcth · « **Reply #69 on:** October 06, 2012, 03:15:26 PM »

Disassembled the engine, it looks to be in great shape. almost like it was previously apart. however not being sure of its previous condition i wanted to make sure i did a thorough inspection and reassembly. Bores were all still perfectly to original spec. no taper. even had factory hash marks still.

as you can see looks pretty damn good...

i get to work on it a couple hours a weekend... sometimes a full day...

last weekend i started rebuilding the calipers. its going well. noticed i had a broken off bleeder. nbd. easy fix.

tires have been ordered. Avon Roadriders in 100/90/19 and 120/90/18. I shall have those mounted up next week.

kidrcth · « **Reply #70 on:** October 06, 2012, 03:16:02 PM »

more...

kidrcth · « **Reply #71 on:** October 06, 2012, 03:23:26 PM »

Yesterday i purchased a parts bike because i have been coming into trouble thinking about how the bike will be going together in the future. just because i started off with a frame and have never worked on one of these bikes before. i have no clue how stuff actually goes back together besides the shop manual. So i have been on the lookout for a parts bike / example for assembly. So i found this gem on craigslist for $100.. its a 78 cb750k - tank and seat. its great for the parts i will need in the future and for assembly guide.

Browneye · « **Reply #72 on:** October 06, 2012, 03:27:01 PM »

Yes indeed, looking good.

Interesting on these motors...I just tore mine down for he same reason. Bores look like glass, ring gap at 17 thousanths. Just going to re-use everything after decarboning, cleaning up. Even the valves hold solvent - no leaks. This one has 38K on the odo.

Did you split the cases? I'm going to put a new primary and cam chain with new tension sliders.

Looking at the same tires. Hmmm...

I was going to get new gauges but I see you can still get the chrome under rings and new faces on ebay, so that saves me about half on those.

I'm going after the 'witchey' look here...

kidrcth · « **Reply #73 on:** October 06, 2012, 03:46:31 PM »

ill be sending the head and cylinders off to the machine shop next week so they can be properly cleaned, decked, and a valve job on the head.

I'm not going to be splitting cases. I haven't really any reason to at this point. The motor has 8k miles on it. The original owner stated he used only full synthetic. But he barely every rode it. he eventually turned it into a chopper project and then i bought it from him.

i never took an end gap measurement, however i did use a bore gauge and checked the bores. they are perfectly straight. 61mm all the way up and down. I purchased new honda rings so they will be brand new rings and a brand new hone before assembly.

Im going minimalistic. If you need anything from that parts bike let me know. Im not needing it for many of the parts.

Browneye · « **Reply #74 on:** October 07, 2012, 10:56:31 AM »

Quote from: kidrcth on October 06, 2012, 03:46:31 PM

I'm not going to be splitting cases. I haven't really any reason to at this point. The motor has 8k miles on it. The original owner stated he used only full synthetic. But he barely every rode it. he eventually turned it into a chopper project and then i bought it from him.

Oh my, 8K. I would tend to agree. It should still be like new inside.

Quote from: kidrcth on October 06, 2012, 03:46:31 PM

If you need anything from that parts bike let me know. Im not needing it for many of the parts.

Thank you for the offer. I can't think of anything right off. Well, maybe a couple of things...

I have a chip in one of my fork tubes. It's pretty high up, but a replacement would make sense.

What kind of condition is the front fender?

Rims? If they need re-chroming I can do that to mine, or buy new ones. They are straight though. Haven't removed the old tires to see how much rust there is on the inside.

Gauges? Mine are rough but restorable.

PM for an email address if that's easier.

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Author Topic: Cafe Project, few questions... (Read 9326 times)