Author Topic: 1975 CB750 K5 "Rhonda the Honda"  (Read 94563 times)

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Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #275 on: April 03, 2017, 06:41:47 AM »
Alright suckers, I'm back. Two week hiatus for the birth of our son.

Finished up Rhonda for this year by mounting the muffler to the collector.

So it turns out that the piece of stainless exhaust pipe I bought was 409 stainless and prone to rusting anyway. So if anyone wants to buy it I'll give it for a good price.

Onto Plan B, which eliminates a clamp anyway.

Had my dad turn down a piece of stainless pipe from his boat parts bin. Fit inside the collector and then made a bit of a venturi into it. Then the cone slips onto this. Welds aren't perfect, and I cleaned up and polished what I could. I'll likely do some more polishing before long. If funds allow I may purchase another slip-on cone to fit right over the collector. Maybe next year. The fit is very tight from the cone to the bung, so I used some Nickel anti-seize (rated to 2500F) on that joint to aid in removal later on.

Fire the bike up and it sounds nice and mean still, just with a softer edge. ;) And if my exhaust tuning theory is correct, then a alight restriction means better bottom end, but the nice open collector will give more top end. Who knows. I'm not exactly concerned.






« Last Edit: April 03, 2017, 06:49:33 AM by evanphi »
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #276 on: April 03, 2017, 08:31:15 AM »
Had my dad turn down a piece of stainless pipe from his boat parts bin. Welds aren't perfect, and I cleaned up and polished what I could.
Did he MIG that weld? If so, if he used ER70s2 that weld will rust. Gotta use Stainless wire (TIG or MIG) to prevent it.

TIG
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #277 on: April 03, 2017, 09:17:44 AM »
stainless
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline BPellerine

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #278 on: April 06, 2017, 06:23:42 PM »
pipe looks good the way it is mounted!still cool in the east for riding yet!bill
1978 CB 750K ard and webers
another anfob

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #279 on: April 07, 2017, 06:38:56 AM »
Yep just getting into warmer weather now. Might try a shakedown this coming week, then hopefully start taking it to work next friday.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline WesTenRacing

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #280 on: April 07, 2017, 08:36:38 PM »
Alright suckers, I'm back. Two week hiatus for the birth of our son.


Congrats on the addition!   8)   Hope everyone's doing well.
Someone to help you in the garage!! :o

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #281 on: April 10, 2017, 08:35:15 AM »
Rhonda's first day in the sun since November! Took her for a nice shakedown run. Carb 1 was overflowing, but quickly remedied by removing bowl and replacing again. I'll be removing the stock mirrors and switch back to my bar-end mirror. They're just too tall and take away from the look I'm going for. Hand guards will come off shortly as the weather warms up. AAAAND I need to take apart the Tach and replace the damping oil. Or maybe just a shot of lube is necessary. My tach is just bouncing all over the place, especially above 3K. But DAMN does she look good.

« Last Edit: April 10, 2017, 10:32:27 AM by evanphi »
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #282 on: April 15, 2017, 05:03:27 PM »


Rhonda's updated Glam shot for 2017. The hand guards will go once things warm up a bit more.

Dang she's pretty!
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline Stev-o

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #283 on: April 15, 2017, 07:26:12 PM »
Nice job on the exhaust.  You happy with it?
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #284 on: April 17, 2017, 06:44:19 AM »
Nice job on the exhaust.  You happy with it?

Very happy. If funds were available, I would have bought a 2.5" ID new cone, but... not this year. Maybe next year's bike budget will allow!
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #285 on: May 04, 2017, 06:36:48 PM »
So my taco does this:

I would like it to NOT do that so I have some 50,000Wt silicone RC diff oil on order. In the meantime I thought I would disassemble the tach to familiarize myself.

Repro. Yay. Here's what's inside:



That 5mm nut can unscrew and that bushing comes out. It is adjustable, it seems. The slotted section + locknut. Two tiny holes, also. These were barely visible when assembled.




So my question is: WTF do I do with all this?! It feels like there was what was left of some slick oil in that little chamber when I took it apart. Makes sense that this would be the damper pot? Just refill, reassemble, and be on my way then?

Other thoughts?
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline RAFster122s

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #286 on: May 04, 2017, 09:51:11 PM »
Evan, yes the dampner pot is filled with between 30k and 50k silicone oil.

I can't view the pics to see what you have posted, my device problem with outdated browser, so, I will take a look after a while, gotta fininsh up adjusting PTO on mower and greasing the chassis before dropping thit to pull the wheels and repack the  bearings.
Sharpen inga few blades  will wait until tomorrow...
David- back in the desert SW!

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #287 on: June 22, 2017, 06:00:52 AM »
Rhonda had an interesting afternoon yesterday.

As some may recall my ignition switch has been flaky as of late. First tumbler pin popped out so I could sometimes insert the key, turn ignition on, then remove the key. I was just waiting for it to fail so last week I ordered a new Honda ignition/lock key set.

Well on the ride back to work from lunch the bike died at an intersection. Kaput. Pulled over to a parking lot. Started fiddling with the keyswitch to make sure that wasn't the issue, and it got stuck in the lights only setting. Fark. So I decided to unhook the battery and lo and behold the negative battery cable bolt was loose. That's what had killed the bike, and I forked with it for nothing and now I'm stranded an hour from home.

Or so I though!

I checked my phone to see where my newly-ordered ignition set was. When I had checked that morning it hadn't updated and it was still on the other side of the country. BUT. HOORAY it was out for delivery. Problem: I'm at work. Wife is out running errands with the baby.

I called her and begged and pleaded for her to drop everything and run home for the postman. Turns out when she got home he had JUST finished writing the missed delivery notice and was about to leave our house. Talk about perfect timing.

So she then drove out to meet me at work with my new Honda parts. I managed to push the bike back to work and still see all my afternoon patients, albeit SOAKED in sweat from pushing it back to work in 27C heat. Once the patients were seen I was able to remove the old switch, reconnect the battery, and off I went.

Wife saves the day!

Rhonda is like new again. Now I just have to put in the seat latch and then it'll be one key for the bike and I'll be able to keep a spare at home.

Whew. What a day it was. Now to get something for the wife to say thanks.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #288 on: July 06, 2017, 08:03:10 AM »
Rhonda is awesome and the new keyswitch is kicking ass.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #289 on: August 25, 2017, 07:30:33 AM »
Had a bad day yesterday...

That's all I can say for now until insurance process is over. I was inside at work at the time so no worries there. Limped her home but riding is done for now.

« Last Edit: August 25, 2017, 07:32:42 AM by evanphi »
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline redknight44

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #290 on: August 25, 2017, 07:34:00 AM »
Had a bad day yesterday...

That's all I can say for now until insurance process is over. I was inside at work at the time so no worries there. Limped her home but riding is done for now, though.



Faack, dude!

I've been following Rhonda from the beginning, this kills me.

Good luck man, hope she's back on her feet soon.


Sent from my iPhone using Tapatalk

Offline Stev-o

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #291 on: August 25, 2017, 07:42:45 AM »
Wow...sorry to see that.  Guessing someone ran into it.  Hopefully they have good insurance....
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #292 on: August 25, 2017, 08:08:08 AM »
Wow...sorry to see that.  Guessing someone ran into it.  Hopefully they have good insurance....

Yup.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline edwardmorris

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #293 on: August 25, 2017, 11:29:06 AM »
Had a bad day yesterday...

That's all I can say for now until insurance process is over. I was inside at work at the time so no worries there. Limped her home but riding is done for now.



Fcuking siht!! Why does this keep happening to good folks I know >:( >:( >:(

Sorry Evan, hope you sort this mess out and get back on the road soon. You seem to be as resilient as Rhonda ;D

Offline BPellerine

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #294 on: August 25, 2017, 01:30:29 PM »
and it just had to be the exhaust side,how much damage?bill
1978 CB 750K ard and webers
another anfob

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #295 on: August 25, 2017, 05:24:58 PM »
Effing bastards!  People have not care to watch for bikes in parking stalls!!! 
1975 CB550K1 "Blue" Stockish Restomod (http://forums.sohc4.net/index.php?topic=135005.0)
1975 CB550F1 frame/CB650 engine hybrid "The Hot Mess" (http://forums.sohc4.net/index.php/topic,150220.0.html)
2008 Triumph Thruxton (http://forums.sohc4.net/index.php/topic,190956.0.html)
2014 MV Agusta Brutale Dragster 800
2015 Yamaha FZ-09 (http://forums.sohc4.net/index.php/topic,186861.0.html)

"There are some things nobody needs in this world, and a bright-red, hunch-back, warp-speed 900cc cafe racer is one of them — but I want one anyway, and on some days I actually believe I need one.... Being shot out of a cannon will always be better than being squeezed out of a tube. That is why God made fast motorcycles, Bubba." Hunter S. Thompson, Song of the Sausage Creature, Cycle World, March 1995.  (http://www.latexnet.org/~csmith/sausage.html and https://magazine.cycleworld.com/article/1995/3/1/song-of-the-sausage-creature)

Sold/Emeritus
1973 CB750K2 "Bionic Mongrel" (http://forums.sohc4.net/index.php?topic=132734.0) - Sold
1977 CB750K7 "Nine Lives" Restomod (http://forums.sohc4.net/index.php?topic=50490.0) - Sold
2005 RVT1000RR RC51-SP2 "El Diablo" - Sold
2016+ Triumph Thruxton 1200 R (http://forums.sohc4.net/index.php/topic,170198.0.html) - Sold

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #296 on: August 26, 2017, 10:29:26 AM »
Don't know exactly how much damage yet... adjuster will be coming soon and I can go over everything then likely do up an itemized list.

Thanks for the kind words... just sucks knowing she's in the garage right now and no chance of being ridden.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive

Offline RAFster122s

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #297 on: August 26, 2017, 11:15:09 AM »
Evan,  Sorry to see this...  I hope they can get it fixed in a hurry.   Did the tank take a hit too?  People are jerks anymore.  I wouldn't be surprised to see some people around here knock one over and keep going.
Hope your insurance stands behind you and makes them fix it and fix it right.  Does Yamiya make a blue tank set?  Might be cheaper than fixing.
Being in Canada you pay through the nose for your bike insurance to begin with, or at least Ontario and some other areas in the East do...  You would think it was a Ferrari or some high priced sports car hearing some of the quotes.

David

I'm going to be doing 150 miles a day very soon...the miles are going to rack up fast.
Bike has motor out and rear case removed (CX500) to do cam chain & stator and water pump seal/mechanical seal, and starter clutch parts...  The kludge of the PO is very irritating... Ujoint on the driveshaft was pretty dry when I pulled it earlier. PO and PPO apparently didn't take good care of that... They did have the rear splines and drive pumpkin greased, just not with 60% moly... Would love to change over to Krytox but 2 ounces is $50-65 depending on which formula you use.  It is a lifetime lube, it is that amazing... reduces gear heat by up to 100-150F in some studies/tests they showed that.  NASCAR drivers love it.

I hope it is a speedy recovery.
Times like this you need that 2nd bike, or one you can borrow from a buddy. Too bad they don't have rental coverage on bikes, eh? Who could afford it if they did...
David- back in the desert SW!

Offline Stev-o

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #298 on: August 26, 2017, 11:53:50 AM »
Don't know exactly how much damage yet... adjuster will be coming soon and I can go over everything then likely do up an itemized list.


Forum member ChrisP went through about a year ago, someone backed into his K3 at Starbucks.

The adjuster was really scratching his head as a lot of the damaged parts are NLA. Chris ended up doing some research finding parts where available and shared the info with the adjuster, they cut him a check, he repaired it himself and come out ahead.

I suggest you doing the same.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline evanphi

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Re: 1975 CB750 K5 "Rhonda the Honda"
« Reply #299 on: August 26, 2017, 03:44:03 PM »
Don't know exactly how much damage yet... adjuster will be coming soon and I can go over everything then likely do up an itemized list.


Forum member ChrisP went through about a year ago, someone backed into his K3 at Starbucks.

The adjuster was really scratching his head as a lot of the damaged parts are NLA. Chris ended up doing some research finding parts where available and shared the info with the adjuster, they cut him a check, he repaired it himself and come out ahead.

I suggest you doing the same.

This is likely what will happen. Hopefully they don't see a huge bill and try to write it off.

Thankfully the company I am with is known for being friendly to motorcycles. They are a major sponsor of several local/nationally sanctioned charity rides.

I'm going to start with a list, and tell them I can do the work myself.
--Evan

1975 CB750K "Rhonda"
Delkevic Stainless 4-1 Header, Cone Engineering 18" Quiet Core Reverse Cone, K&N Filter in Drilled Airbox
K5 Crankcase/Frame, K4 Head and Cylinders, K1 Carbs (42;120;1 Turn)

She's a mix-matched (former) basket case, but she's mine.

CB750 Shop Manual (all years), searchable text PDF
Calculating the correct input circumference for digital speedometers connected to the original speedometer drive