Author Topic: '76 750K: Project Gunfighter (Read 44954 times)

dhall57 · « **Reply #50 on:** November 12, 2011, 11:03:21 AM »

Go to this site and it will give you a lot of info. Looks like you have a K5 instead.

http://www.hondachopper.com/engine/engine.html

Greggo · « **Reply #51 on:** November 12, 2011, 11:09:51 AM »

Quote from: dhall57 on November 12, 2011, 11:03:21 AM

Go to this site and it will give you a lot of info. Looks like you have a K5 instead.

http://www.hondachopper.com/engine/engine.html

Well, looks like I've got an early K6 frame with a K5 motor. So, what jets should I be starting with?

dhall57 · « **Reply #52 on:** November 12, 2011, 11:27:58 AM »

I think the K5 is just like my K6 it came with 105 mains from the factory.

Greggo · « **Reply #53 on:** December 08, 2011, 04:22:11 PM »

Two steps forward, one step back

Step Forward: My 17" 77-78 rear wheel is good to go after swapping the cush drive over. I also greased up the swing arm, and the bushings feel good!

Step Forward: I received a really nice set of carbs from another member who lives in the Bay Area. I'm gonna shoot some air and carb cleaner through them, and they should be goooood to go!

Step Back: I pulled the sprocket cover to swap in a new sprocket, and was greeted by oil spewing out of the case. Is there a common seal behind all this linkage that I should suspect? Is this normal?

?

lucky · « **Reply #54 on:** December 09, 2011, 12:57:57 AM »

Quote from: Greggo on December 08, 2011, 04:22:11 PM

Two steps forward, one step back

Step Forward: My 17" 77-78 rear wheel is good to go after swapping the cush drive over. I also greased up the swing arm, and the bushings feel good!

Step Forward: I received a really nice set of carbs from another member who lives in the Bay Area. I'm gonna shoot some air and carb cleaner through them, and they should be goooood to go!

Step Back: I pulled the sprocket cover to swap in a new sprocket, and was greeted by oil spewing out of the case. Is there a common seal behind all this linkage that I should suspect? Is this normal??

You need to get four new float needles or it will never run right.
If they are the all metal float needle you will have to buy the seats too because they get ruined from vibration just like the needle. Maybe replace with rubber tipped needles and new seats.
You will see a shinny ring around the tip of the metal float needle, and if you look at it with a good magnifier you will see that the shinny ring is actually a step worn into the needle. If it has rubber tip needles then you just need four new needle but not the seats.

Greggo · « **Reply #55 on:** December 09, 2011, 12:58:04 PM »

There shouldn't be oil building up behind that outer cover, correct? All that's in the pan came from behind that outer sprocket cover.

Kanticoy · « **Reply #56 on:** December 09, 2011, 01:05:37 PM »

Quote from: Greggo on December 09, 2011, 12:58:04 PM

There shouldn't be oil building up behind that outer cover, correct? All that's in the pan came from behind that outer sprocket cover.

Looks excessive. Seems to me as if your shift shaft seal could be going bad. I'm not a 750 guy, so I'm sure someone else will be able to offer a lot better advice.

Greggo · « **Reply #57 on:** December 09, 2011, 01:11:12 PM »

Quote from: Kanticoy on December 09, 2011, 01:05:37 PM

Quote from: Greggo on December 09, 2011, 12:58:04 PM
There shouldn't be oil building up behind that outer cover, correct? All that's in the pan came from behind that outer sprocket cover.

Looks excessive. Seems to me as if your shift shaft seal could be going bad. I'm not a 750 guy, so I'm sure someone else will be able to offer a lot better advice.

Thanks. I've been assuming there was a pretty good reason someone abandoned this bike 15 years ago, and I've been waiting to find it. At least if it's just the shift shaft seal the cases don't have to be split (I think?).

Bob3050 · « **Reply #58 on:** December 09, 2011, 01:48:09 PM »

Greggo: That area is open to the crankcase and does normally have oil in it when you remove the case cover. The only seal is the shift shaft seal in the outer case cover. You don't need to remove that cover to get to the front sprocket. The cover you want is just ahead of the rear motor mount. I believe it is held on with 3 6mm screws.
Bob

MCRider · « **Reply #59 on:** December 09, 2011, 01:56:20 PM »

Yeah, Bob3050 is mostly right. The cover you are calling a sprocket cover is the shifter cover. Called Trans cover in parts books. Its wet hence the gasket. Put a shim under the foot of the center stand to lean it to the right and most of that oil would drain into the case.

If the shift seal was leaking the oil would have been apparent without removing that cover.

The sprocket cover is a rube goldberg piece (hard to fit into place) held with 2 long 6mm screws. Its still on you bike in the picture.

There is no oil behind the sprocket cover, no gasket, just the sprocket. Bob's right the trans cover does not come off to access the sprocket.

Greggo · « **Reply #60 on:** December 09, 2011, 03:09:10 PM »

Thanks Guys. I knew the real sprocket cover could come out without the shifter (I now know the correct nomenclature) cover coming off, I just didn't know to expect oil when I pulled the shifter cover. When I saw the gasket on the removed cover, I thought that may be a 'wet' area - but it's best to ask and then know for sure!

Nothing surprises me on the 500 anymore, but I'm just beginning to learn about these 750's

I need to buy Mark's book!

Greggo · « **Reply #61 on:** January 27, 2012, 08:07:37 PM »

Haven't had a chance to touch the bike lately, but I finally got some time to dig into these good carbs. I cleaned every passage, and every hole in every jet. Set the floats after installing the new needles and seats like Lucky suggested. Unfortunately Parts N More sells the Keyster parts, so I hope they work as well as stock. These carbs are now ready to throw onto the bike. I also drilled holes in the air box lower as per the advice in HondaMan's excellent book. I've got a chain, brake shoes, and sprockets to install when I get to the bike next week. The back end will be done. If I have time I'll mount the handlebar, grips, throttle, and switches. The back 17 now has some really sweet Avon rubber.

I went with the 105 mains for now, because the 120's I have are actually warped. They look melted almost.

lucky · « **Reply #62 on:** January 28, 2012, 08:41:58 AM »

Quote from: Greggo on October 01, 2011, 04:29:41 PM

I still love my 500/4, but I've been jonesin' for a 750 lately. Well, here's my fix. 1976 CB750K. 36k miles. Corbin Gunfighter seat. Nice Jardine 4-2's.

Jardine 4-2 exhaust. I need the clamps at the head.

Stacks will be sold eventually. I need an airbox with the boots.

The seat is obviously the star of the project so far. It's the first one in Corbin's run of the new Gunfighter seats. They made the seat using this bike.

16" Harley rim laced to the 750 hub. I will probably source an 18" rim. If I can get the spare wheel from my '71 500/4 to work I will do that. I imagine I need a different brake plate and spacers...

Front rim is in great shape.

Tank is incredibly clean. These shots were really hard to get.

Parking the bike in back of a car like that is a sure way to get it smashed up.

Greggo · « **Reply #63 on:** January 28, 2012, 09:01:40 AM »

It was parked there for about an hour...

Greggo · « **Reply #64 on:** February 01, 2012, 06:08:40 PM »

Got the rear wheel installed today. That included a new bearing in the sprocket carrier, new brake shoes, and a new sprocket on the back. New sprocket on the front too, that was a bigger PITA than I had expected...this engine does have the chain oiler system. Got the carbs installed, air box will go on next week.

wedoo2 · « **Reply #65 on:** February 02, 2012, 05:57:07 AM »

The Gunfighter's butt is looking real good. Don't you love new bling?

rickmoore24 · « **Reply #66 on:** February 02, 2012, 09:03:25 AM »

Ah the airbox. I curse putting that bastard on! She'll run best with it on of course, but maaaan oh man getting that thing on really tested my patients.

I hope yours goes on easily.

Greggo · « **Reply #67 on:** February 02, 2012, 09:26:40 AM »

Quote from: wedoo2 on February 02, 2012, 05:57:07 AM

The Gunfighter's butt is looking real good. Don't you love new bling?

Haha! Thanks Wedoo, it sure felt nice getting the 'butt' back together..

Quote from: rickmoore24 on February 02, 2012, 09:03:25 AM

Ah the airbox. I curse putting that bastard on! She'll run best with it on of course, but maaaan oh man getting that thing on really tested my patients. I hope yours goes on easily.

That dang thing was a big pain in the ass! Like playing a game of bloody knuckles with a motorcycle - I had no chance of winning.

rickmoore24 · « **Reply #68 on:** February 02, 2012, 09:36:05 AM »

LOL at least it on now.

Enjoy!

Old75_ratafe · « **Reply #69 on:** February 02, 2012, 12:42:39 PM »

ehh its not that bad... however new rubbers make a huge difference.

rickmoore24 · « **Reply #70 on:** February 02, 2012, 03:53:45 PM »

Very true.

Greggo · « **Reply #71 on:** February 02, 2012, 04:34:53 PM »

The box is still sitting there like in the pic. The carb to engine boots are old, but the air box boots are new and soft. I only fiddled with it for a few minutes before deciding to leave it for next time. My hands were really beat up from fitting the carbs, and lifting some heavy things helping around the shop. We were given some heavy truck equipment from a company closing a couple shops...a six foot work bench, two hydraulic hose makers, and some other pieces...unloading was not fun.

Greggo · « **Reply #72 on:** February 06, 2012, 04:57:45 PM »

More progress today. Got a chain installed, the brake linkage hooked up in back. Sprocket cover and transmission cover installed with new gasket. The air box is now installed and clamped in. I got the hole drilled on the handlebars so I can get the switches on next time...pretty productive day!

The evidence...

Obviously, she's not winning any beauty contests, and I won't be expecting a BOTM nod on this bike. But, my goal is to get a reliable rider out of this one, and make her pretty down the line.

wedoo2 · « **Reply #73 on:** February 06, 2012, 05:13:27 PM »

Just run it through the car wash and take pictures of the rear. Maybe you'll get a nomination. You know, Honda didn't get too creative with the shape of that shifter cover. It's kind of bland, but it sure would be easy to buff out.

Greggo · « **Reply #74 on:** February 06, 2012, 11:29:43 PM »

Quote from: wedoo2 on February 06, 2012, 05:13:27 PM

Just run it through the car wash and take pictures of the rear. Maybe you'll get a nomination. You know, Honda didn't get too creative with the shape of that shifter cover. It's kind of bland, but it sure would be easy to buff out.

Hey, that's Patina!!

Really though, it would be a sad month if this bike got a nod. However, the gunfighter seat, the gold/black striped K1 tank I just got from ScottS,

and the side covers I'm (hopefully) getting from Stev-o will make this bike stand out. It will look great from 10 feet away. After I get some miles out of it, and finish up a 550 turbo project or two

I'll strip it down 'n turn it into a show stopper..someday..

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Author Topic: '76 750K: Project Gunfighter (Read 44954 times)