Author Topic: Senior project for high school - 78 CB750K (Read 169620 times)

calj737 · « **Reply #975 on:** April 18, 2015, 03:55:44 am »

Bill is CB750supply.local ! Sure beats waiting on shipping and he furnishes beverages. Nothing like good old Southern Hospitality

Restoration Fan · « **Reply #976 on:** April 18, 2015, 10:56:58 am »

OK....here are the problems du jour:
1. The shifter mechanism has displayed issues before and I ended up pulling the neutral switch out the other day just so it would shift properly. We shifted up to 5th gear before we started working with the rotor. So it WAS in 5th gear....currently, we can't really tell what gear it's in. But as you can see from the video, it will shift about twice but won't go all the way down to first gear and certainly can't get to neutral. The mechanism that should only go around in a circular motion appears to be moving up and down as well.

2. The neutral light hasn't wanted to go out. We took the switch out and confirmed that it works with the electrical tester. Also, we took the neutral switch and connected it to the wire, then turned on the lights. With the wire connected, when we ground the unit to the exhaust, the light comes on while the ball is extended. With the unit still touching the exhaust or frame, if you push the ball in, the light goes out. So the unit seems to be working. I'm assuming that this problem has something to do with the shifting issue and there is some type of issue that's causing it not to get fully seated in the bottom of the unit and press the ball in enough to make the light go out. But I welcome any comments that might explain why that is. (By the way, we ended up taking the o-ring out just as a test, to make sure it wasn't the problem but it still doesn't go far enough in to depress the button even without the o-ring.)

3. The rotor itself doesn't want to go back on the tapered shaft. We put a tiny bit of grease on the inside of the new rotor and gear. Then we slide it onto the shaft and insert the bolt and run it up tight. With the bike in what we believe is 5th gear still, Logan holds down the rear brake and I use the air impact wrench to try and use the bolt to pull the assembly onto the shaft. It turns a bit but soon stops and won't turn any more but it isn't pulling it onto the shaft...proof of which comes when we unscrew the bolt and are able to just pull the assembly off the shaft by hand with no trouble.

Is there some other something that we're missing that we should be doing here? The manual just says, "Reassemble the following...." and has the AC Generator as one of the things to reassemble.

Johnie · « **Reply #977 on:** April 18, 2015, 11:56:21 am »

If the drive chain is on the bike try rotating the back wheel a little. Sometimes rotating that small sprocket a little helps when I run a bike through the gears while not running.

madmtnmotors · « **Reply #978 on:** April 18, 2015, 12:55:34 pm »

Quote from: Johnie on April 18, 2015, 11:56:21 am

If the drive chain is on the bike try rotating the back wheel a little. Sometimes rotating that small sprocket a little helps when I run a bike through the gears while not running.

+1

Restoration Fan · « **Reply #979 on:** April 18, 2015, 01:14:40 pm »

You guys are awesome! That fixed the shifting issue. Any ideas on getting the rotor back on?

Restoration Fan · « **Reply #980 on:** April 18, 2015, 03:15:06 pm »

The rotor will go onto the shaft and the screw will go in and tighten up until the air wrench can't turn it anymore. But when I back the screw out, you can remove the rotor by just pulling lightly on it. I'm thinking that probably isn't good.

However, we did try to putting it on as far as it would go and trying to see if it would crank. The good news is that the starter clutch issue is now fixed. You can hear it trying to turn over. It's now either just not getting spark or gas because it isn't firing and cranking.

Also, we got the shifter issue fixed; it was indeed something that just needed to be bumped on that rear wheel and let it remove the binding on the front and turning the wheel while it was in gear would make it move slightly and then the gear shift was freed up.

And we also got the neutral light issue fixed. Now when you put it in neutral, we get a light; when we shift into gear, there's no light.

Small steps. Now it seems we need to see what's going on with the carbs and/or spark.

madmtnmotors · « **Reply #981 on:** April 18, 2015, 04:58:00 pm »

>Make sure the kill switch is set to "run"
>Make sure the petcock is set to "on" (or reserve if you're only using a splash of fuel)

Stev-o · « **Reply #982 on:** April 19, 2015, 11:21:39 am »

Quote from: madmtnmotors on April 18, 2015, 04:58:00 pm

>Make sure the kill switch is set to "run"
>Make sure the petcock is set to "on" (or reserve if you're only using a splash of fuel)

>Confirm spark by pulling plug, reconnect plug wire, set plug against head and cranking motor.

Restoration Fan · « **Reply #983 on:** April 19, 2015, 06:27:49 pm »

That's a great tip, Steve-o. Had to go out of town all day so just getting back home at the moment. Going to try that tomorrow though.

I'm wondering if the issue with getting the rotor back onto the shaft is that my air impact driver isn't strong enough? I'm thinking maybe I should go get a bigger one, just in case?

madmtnmotors · « **Reply #984 on:** April 19, 2015, 08:38:00 pm »

Oh yeah! Bigger hammer fix everything!

The starter gear isn't hanging up on the reduction gear is it? You might remove the reduction gear while installing the rotor, then reinstall the reduction gear...

just in case.

martin_uk · « **Reply #985 on:** April 20, 2015, 01:52:56 am »

Quote from: Restoration Fan on April 19, 2015, 06:27:49 pm

That's a great tip, Steve-o. Had to go out of town all day so just getting back home at the moment. Going to try that tomorrow though.

I'm wondering if the issue with getting the rotor back onto the shaft is that my air impact driver isn't strong enough? I'm thinking maybe I should go get a bigger one, just in case?

Hi Ron,I have never tried removing rotor immediatly after fitting, so not sure about how tight they are to get off after recent fitment.

I have removed 6 rotors on different CB750's using large puller bolt and some are very tight and others come off easily.

If there is no play when tightened and it is gripping the crankshaft it is probably OK.

I always use an impact wrench to do these up and providing you have good air pressure, should be OK.

You can try putting in gear with rear brake on and check tighteness with a long socket bar/torque wrench.

Restoration Fan · « **Reply #986 on:** April 20, 2015, 04:21:26 pm »

Wilbur,
Did your badges come in from Down Under yet? Mine arrived today.

danyo · « **Reply #987 on:** April 20, 2015, 04:27:26 pm »

^^^ those are from F model. Did they send you wrong ones or you just don't care??

Restoration Fan · « **Reply #988 on:** April 20, 2015, 04:37:44 pm »

Quote from: danyo on April 20, 2015, 04:27:26 pm

^^^ those are from F model. Did they send you wrong ones or you just don't care??

They sent me the wrong ones and I didn't notice until you said that.

Ron

madmtnmotors · « **Reply #989 on:** April 20, 2015, 05:32:47 pm »

Mine came today as well:

I was sure to order them by make, model, and part number (HS-27) as what was indicated on their original site:

http://www.marblesmotors.com/partsforsalehondabadges.htm

as well as what I believe is their actual Australian source:

http://www.badgereplicas.com.au/badges_honda.htm

Did you give a part number when you ordered? Randy seemed pretty good to work with, give him a call and see what he can do to help.

Restoration Fan · « **Reply #990 on:** April 20, 2015, 05:40:26 pm »

Quote from: madmtnmotors on April 20, 2015, 05:32:47 pm

Mine came today as well:

I was sure to order them by make, model, and part number (HS-27) as what was indicated on their original site:

http://www.marblesmotors.com/partsforsalehondabadges.htm

as well as what I believe is their actual Australian source:

http://www.badgereplicas.com.au/badges_honda.htm

Did you give a part number when you ordered? Ron seemed pretty good to work with, give him a call and see what he can do to help.

I'm going to call tomorrow and see about getting them swapped. I didn't give him the actual part #; I guess I should have. I told him I needed the one for the 78K model and just assumed that someone who was making the badges would know what that was. Little did I know at the time that they were just a reseller for the Australian company.

madmtnmotors · « **Reply #991 on:** April 20, 2015, 05:51:04 pm »

Yeah, normally make ,model and year is usually enough, but due to the fact that these are year and model specific (one year, one model) as well as the confusion exhibited by other members here that happen to be quite familiar with these bikes, I knew I couldn't be too careful so I made sure he understood the part number I was talking about. Add to that the number of different types of badges they are dealing with, and it was bound to happen to someone.

Sorry to hear it happened to you. So close, and yet so far! Shipping was pretty reasonable (ten bucks from Australia?), so I don't think you'll have much trouble getting it sorted.

Stev-o · « **Reply #992 on:** April 20, 2015, 06:15:57 pm »

Quote from: Restoration Fan on April 20, 2015, 05:40:26 pm

Quote from: madmtnmotors on April 20, 2015, 05:32:47 pm
Mine came today as well:

I was sure to order them by make, model, and part number (HS-27) as what was indicated on their original site:

http://www.marblesmotors.com/partsforsalehondabadges.htm

as well as what I believe is their actual Australian source:

http://www.badgereplicas.com.au/badges_honda.htm

Did you give a part number when you ordered? Ron seemed pretty good to work with, give him a call and see what he can do to help.

I'm going to call tomorrow and see about getting them swapped.

Hope you have better luck than me. I received a broken badge for my H1 from Marble and have been waiting a month for a replacement. Safe to say I won't be ordering from him again especially since we now know they come from Oz anyway.

martin_uk · « **Reply #993 on:** April 21, 2015, 08:36:57 am »

Quote from: madmtnmotors on April 20, 2015, 05:32:47 pm

Mine came today as well:

http://www.badgereplicas.com.au/badges_honda.htm

When I try to connect to Oz site I get

"Error. Page cannot be displayed. Please contact your service provider for more details. (1)"

Maybe preventing sales to UK?

madmtnmotors · « **Reply #994 on:** April 21, 2015, 08:46:20 am »

Quote from: Stev-o on April 20, 2015, 06:15:57 pm

Hope you have better luck than me. I received a broken badge for my H1 from Marble and have been waiting a month for a replacement. Safe to say I won't be ordering from him again especially since we now know they come from Oz anyway.

Definitely hate to hear that Steve. I was thinking that in both yours and Ron case it might be worth offering to pay for shipping (at least one way?) just to get things resolved. It ain't right, but it might help, and would be a somewhat inexpensive lesson regarding a particular vendor.

Good luck guys.

Restoration Fan · « **Reply #995 on:** April 21, 2015, 09:11:40 am »

I just spoke with Randy earlier and he promised to make it right. It actually wasn't his mistake. I found the email where I had actually sent him the photo of the desired badge (the one linked earlier in the thread). And he requested the correct part number because we pulled up his email.

He did say the guy was going to be out for the next 3 or 4 weeks so it would take some time but he assured me he would make it right. I have the 77K badges on it right now, so as long as I eventually get the correct badges, it's all good.

Maurice · « **Reply #996 on:** April 21, 2015, 09:31:42 am »

Are you going to wait for the correct badges to show up before firing up the damn thing? Let me know so I can get on with my life, thanks

Restoration Fan · « **Reply #997 on:** April 21, 2015, 09:49:59 am »

Quote from: Maurice on April 21, 2015, 09:31:42 am

Are you going to wait for the correct badges to show up before firing up the damn thing? Let me know so I can get on with my life, thanks

Ha. No we are troubleshooting why it isn't starting but have been hampered by Logan needing to study for his AP Calculus finals. Why they are holding them a month early is strange but they are having them Thursday.

Restoration Fan · « **Reply #998 on:** April 21, 2015, 10:39:13 am »

Quote from: martin_uk on April 21, 2015, 08:36:57 am

When I try to connect to Oz site I get

"Error. Page cannot be displayed. Please contact your service provider for more details. (1)"

Maybe preventing sales to UK?

It's possible, Martin. If you need me to order some and send them to you, just let me know.

Ron

Jerry Rxman Griffin aka MuthaF'er · « **Reply #999 on:** April 21, 2015, 11:26:53 am »

Quote from: Restoration Fan on April 20, 2015, 04:37:44 pm

Quote from: danyo on April 20, 2015, 04:27:26 pm
^^^ those are from F model. Did they send you wrong ones or you just don't care??

They sent me the wrong ones and I didn't notice until you said that.

Ron

What are you going to do with those?

News:

Author Topic: Senior project for high school - 78 CB750K (Read 169620 times)