Author Topic: 1980 Honda CB650: The Cash Machine - Gremlin Whack-a-Mole  (Read 161879 times)

0 Members and 1 Guest are viewing this topic.

Offline Kelly E

  • Geriatric Hooligan
  • Old Timer
  • ******
  • Posts: 2,680
Re: 1980 Honda CB650: The Cash Machine - major progress
« Reply #125 on: October 31, 2024, 01:29:15 PM »
Cool  8)


I'm trying the same get him into bikes so he won't have time or money for drugs. ;D
Never Give Up - Never Surrender

The Rust Bros. Garage Collection
1974 Honda CB 550 K0                                            1971 MGB/GT
1975 Honda CB 400F Super Sport                          1972 MGB/GT
1977 Kawasaki KZ 1000 LTD                                   1985 GMC S15
1978 Kawasaki KL 250
1980 Suzuki GS 1100E
1983 Honda CB 1100F
1984 Honda VF 700S Sabre
1984 Honda VF 1000F Interceptor
1990 Moto Guzzi 1000 Le Mans
1994 Kawasaki Concours ZG 1000A9
2005 Harley Davidson Fat Boy

Offline JimJamerino

  • Yay! I'm a
  • Hot Shot
  • ***
  • Posts: 268
  • Not rich enough to be "eccentric."
    • My CB650C build thread
Re: 1980 Honda CB650: The Cash Machine - It Runs! It Rides! It Runs Out of Gas!
« Reply #126 on: September 04, 2025, 02:06:08 PM »
It's been a minute, but I thought I'd at least post the pretty pictures.

The headline is I was able to take it for a couple of shakedown runs!

I'll come back later, rearrange, and add some more detail about the shakedowns.

Nearing completion beauty shots.
IMG_3867.HEIC

IMG_3866.HEIC

This is what the Cash Machine looks like when it's out of gas on the side of the road.
IMG_3937.HEIC

Painted the rear fender and one of my spare headlight buckets, as well as the side covers and tank. It's just a rattle can hunter green. It was the closest I could get to a money color, but I like how it turned out.
IMG_3863.JPG

IMG_3407.HEIC

IMG_3406.HEIC

These stickers are reflective. They're for safety.
IMG_3789.HEIC

The intake boots were rock hard and cracked. I found replacements on Amazon, of all places.
IMG_3459.HEIC

On, off, on, off... clean? Clean now? How about now?!
IMG_3457.HEIC

Next project: My wife's 1964 Honda Dream 305.
IMG_3930.HEIC

Progress was made.
IMG_1947.JPG

A little Vaseline on the gaskets keeps them in place long enough to put things together. I picked this trick up here on the SOHC/4 forum, and it works on carb bowl gaskets, too.
IMG_1943.HEIC

This is why put in new crush gaskets every time you pull the exhaust.
IMG_1942.HEIC

I didn't know it when I took this pic, but at the moment there's a significant oil leak coming from somewhere in this region. I hope it's not the countershaft, because I'd have to pull the whole engine and split the cases to get to that one.
IMG_1938.HEIC

An interesting design choice by Honda. The CB650 Standard kickstand spring... peg... mount thingy is on the BACK of the frame plate. This kickstand is from a CB650 Custom; notice the hook for the kickstand spring is on the FRONT of the kickstand. I think I'm going to weld a small chain link to the back of the kickstand so I can have a side stand again. Relying on the center stand is not particularly fun.
IMG_1936.HEIC

IMG_1937.HEIC

I designed these Cash Machine logos with the help of ChatGPT, Canva, and Adobe Illustrator. The big ones are 6" tall and will go on the sides of the tank. My local library has a Makerspace with a vinyl printer, and they charge $7.25 per linear foot to print stickers.
IMG_3983.HEIC

ChatGPT-generated logo ideas
IMG_3163.PNG

I ended up using this image, with a little doctoring, for printing.
IMG_3160.PNG

My friend Caleb and I enjoy working on cars and motorcycles. We have a very exclusive custom vehicle company we call Rockin' Proper Customs. It's so exclusive that we are our only clients. I figured it was time we had a logo and merch. These are 2.5" stickers.
IMG_3982.HEIC
~ Jim

formerly "emperorspartacus"

There are old bikers.  There are dumb bikers.  There are no old, dumb bikers.

My CB650C rebuild http://forums.sohc4.net/index.php?topic=74212.0

Offline JimJamerino

  • Yay! I'm a
  • Hot Shot
  • ***
  • Posts: 268
  • Not rich enough to be "eccentric."
    • My CB650C build thread
Re: 1980 Honda CB650: The Cash Machine - It Runs! It Rides! It Runs Out of Gas!
« Reply #127 on: September 04, 2025, 06:33:23 PM »
OK, so a little more detail for those who don't mind reading.

The pics from 2024 (up to and including the one with the zip ties on the tire) are from our old house. We were going broke trying to keep too much house, so I wasn't getting very far with much of anything. Nonetheless, I was able to get the mechanical components put back together. All that was left was to handle the electrical components.

To get back within our means, we put the house up for sale and moved into a much smaller place that does not have a garage. I wanted a shop space of some kind, so I got an unheated, no power 10x20 storage unit. Not a perfect solution, but I call it my Storage Shop. After getting everything moved and situated, the house sat on the market for almost a year. Paying for two houses was kind of a step backwards in the whole "saving money" process, but I had pretty much everything I needed on hand to start sorting out the electrics. To distract from the headaches of being broke, I tinkered with the bike on occasion. Every step forward was met with half a step back, but even slow progress is still progress.

Over the course of July and August of 2025:

I get the headlight to work, but the tail light won't light up. Dirty connectors.

Get the tail light to work, but no brakes. Bad rear brake switch and a grounded out switch on the handlebar.

Get the brake light to work, but no turn signals. The tail light is LED, so maybe not enough resistance? I have an electronic flasher on hand now; I just haven't tried to work it out.

The marker lights used to work, but now they don't. I suspect a bad or missing ground on the fork. I'll sort this out later with the turn signals. I'll ride with hand signals for now.

The headlight quit working. Dirty starter switch got cleaned with contact cleaner; now it works again.

The tail light quit working. It's blowing fuses instantly. Turns out the connector I thought was a ground is actually hot and does not need to be plugged into a ground tab in the headlight bucket. My bad. Disconnect the connector and all is well. Perfect example of "If it used to work and now it doesn't, undo the last thing you did."

The headlight works, the tail light works, and the brake light lights up properly. Yay! Time to start it!

It only runs on 2 or 3 cylinders and pisses gas out of 2 carbs drains. Pull the carbs, clean, reinstall.

Still only running on 3 cylinder. I can pull the spark plug for #2 and nothing changes. Pull the carbs, clean again, this time paying special attention to #2.

Still runs on only 3 cylinders. Frustrated, walk away for a week or so. Let it sit in time out and think about what it did.

Got a storage unit closer to the new house. Recruit Caleb and Jason to help move. Start the bike to demonstrate the 3 cylinder problem. It sounds fine. Even warms up and responds to throttle. Whatever. Move everything to Storage Shop 2.0.

Get everything situated in Storage Shop 2.0. Start the bike; it runs fine, but there's a drop of fuel from the petcock when I turn it from "OFF" to "ON." A minor problem for Future Jim to handle.

Ride it around the storage unit complex. Get very excited, and go for a short shakedown run.

It rides straight, handles nice (a pleasant surprise since I raked the neck 5 degrees and extended the fork 3"). Brakes work, take it off choke as it warms up, fiddle with the idle so it doesn't die at stop lights. There's an occasional weird "thunk" noise that doesn't seem to correlate to bumps in the road, engine speed, vehicle speed, or anything else. It sounds like something hitting heavy sheet metal. Not a light tap, not a solid or ringing whack. When it "thunks," I can't feel a shock in the handlebars or when I touch the tank. Get nervous, take it back to the Storage Shop for analysis. The brake light is hanging by its wires. Surely that's the source!

Fix the brake light, notice the exhaust pipe bolts are loose. Tighten those, too. Go for another shakedown. The thunk remains. Get nervous, go back to the Storage Shop. Nothing obvious... but now there's an oil puddle coming from the front sprocket area. It's a fairly significant leak, even by Harley standards. Notice the sprung solo seat has a lot of play in the hinge and the bolt is loose. Replace the nut with a nylock nut and tighten it down good to tighten up tolerances.

Go for another shakedown. The thunk remains. About 3 miles from the storage shop, lose the back brake. Pull over immediately, discover the rear brake stay dragging on the ground. Baby the bike back to the Storage Shop and source another brake stay bolt from spare parts. Make damn sure the cotter pin is in place. Go for another shakedown run.

The "thunk" is gone! Feel like an idiot for not tightening the brake stay in the first place, head out to the back roads for a little longer ride. Pass a gas station, and suddenly lose power. Pull over, bike won't start. Flip the fuel petcock over to "RES" and wait. Bike still won't start. Call my dad, who lives just a couple blocks away, to bring me gas rather than push the bike a quarter mile back to the gas station. Get off the phone with Dad, and try to start the bike. It fires up immediately. Continue feeling like an idiot, and let Dad laugh at me for running out of gas. Go back to the gas station and fill up. Get back to the Storage Shop and put the bike away, making sure to turn the petcock off. Put kitty litter and cardboard under the bike to soak up the leaking oil.

Come back to the Storage Shop the next day with the intent of riding, get hit in the face with an overwhelming smell of gas. Look at the petcock and see that it is indeed "OFF," and then see it drip twice from the lever. Future Jim is now Now Jim, and is pretty annoyed with Past Jim. Drain the tank, install the spare, and discover the gasket on the spare is shot. Feel defeated and order a new petcock from Amazon. Wait 2 days, get the petcock in the mail, then immediately take it to the Storage Shop and discover that I ordered the wrong one and it doesn't fit. Return it and order a different one.

Go to the library and print Cash Machine decals. Be very impressed with the finished product. Decide to wait for the new petcock so the stickers can be placed with the tank on the bike.

The new petcock arrives literally as I write this sentence. It's dark and I don't have lights in the Storage Shop. Tomorrow I will try again! I'll take video and post glamour shots, and call it 98% finished. I'll investigate the oil leak soon and hope like hell it's just the shift shaft or oil pump. Otherwise, I may have a winter engine rebuild project.

On a side note, I have enough CB650 parts to make another whole bike, but the frame is untitled. In South Dakota, they're awful fussy about titles and I don't have a good solution. I plan to part it out. Anyone need some CB 650 parts?

~ Jim

formerly "emperorspartacus"

There are old bikers.  There are dumb bikers.  There are no old, dumb bikers.

My CB650C rebuild http://forums.sohc4.net/index.php?topic=74212.0

Offline MauiK3

  • A K3 is saved
  • Old Timer
  • ******
  • Posts: 4,853
  • Old guy
Re: 1980 Honda CB650: The Cash Machine - It Runs! It Rides! It Runs Out of Gas!
« Reply #128 on: September 06, 2025, 08:06:21 AM »
Fun project! Have to just keep going.
1973 CB 750 K3
10/72 build Z1 Kawasaki

Offline JimJamerino

  • Yay! I'm a
  • Hot Shot
  • ***
  • Posts: 268
  • Not rich enough to be "eccentric."
    • My CB650C build thread
Re: 1980 Honda CB650: The Cash Machine - Gremlin Whack-a-Mole
« Reply #129 on: September 10, 2025, 09:56:43 PM »
As the title says, it's been Gremlin Whack-a-Mole. One problem down, another pops up. Solve that one, the first one comes back with a twist.

So I got the replacement petcock from Amazon, and to my joy, it fit perfectly. With no fuel line hooked up, it clearly holds gas with the switch turned off, and feeds properly when turned on or to reserve. I go to attach it to the fuel line, and... the 1/4" fuel line I used with the stock petcock is waaaaaayyy too big. No chance I'm using a hose clamp to make up that much difference between the barb and the fuel line. My caliper says the barb is a shade over 5mm. Back to Amazon. Overnight some 5mm and some 5.5mm fuel line for like $10 each. I figured the stock fuel line is 5.5mm, but I don't know if this aftermarket petcock is smaller than stock.

It turned out the 5.5mm fit perfectly, on both the petcock and the carbs. Not a drop has leaked in 5 days, as far as I can tell. I sent back the 5mm. Yay Amazon returns! This brings us to last Sunday. I took it for a quick spin, about 3 miles. When I got back, I noticed that there was oil streaked on my rear tire. That's where I draw the line, so I pulled the sprocket cover to investigate. It didn't take long to find the culprit: The countershaft seal behind the sprocket was literally dripping. I don't have any pictures, but I found that a PO had used liquid gasket and that's where it was leaking. I drained the oil, then dug around, peeling off liquid gasket only to find that at some point, the OEM seal had been removed and replaced with a seal that had the correct ID for the countershaft, but left a good 1/8" gap all the way around. They had filled that gap with a LOT of liquid gasket.

Well... it hasn't leaked in the 5 years I've had this engine, so it ain't dumb if it works... right? I decided to replicate the band-aid, with a small modification. I stuffed some O-ring material between the seal and the case, thinking that might help prolong the repair and delay the need to split the cases. The liquid gasket I got takes 24 hours to fully cure, so I slathered some on, filling up the space left in front of the O-ring I had wedged inside.

Monday evening rolled around, and the liquid gasket had cured. I filled the bike up with oil, started it up (with the sprocket off) so I could see if there was a problem. Immediately there was a steady stream of oil from around the countershaft. It did not seem to be leaking around the liquid gasket band-aid. My guess is by stuffing an O-ring in the gap, I pushed the seal off-center and made a gap around the shaft. After a little research here on the forum, I decided to follow in IainC's footsteps and ordered a 36x56x8mm seal (which, again, amazingly, was on Amazon). I am waiting for that to show up in the mail at the moment. It should be here tomorrow, but probably will arrive after dark, so I'll have to wait to install it.

My indicator/gauge LED bulbs showed up today, too. I had already gotten the LED headlight with integrated turn signals and new headlight bucket brackets, but I figured I'd just work on the lights. I got the LED headlight installed with very little trouble. It was pretty much a direct fit, which was really nice. The light is clean and bright! I also managed to get the indicator lights and gauge lights replaced tonight before it got too dark. The LEDs are definitely much stronger light than the old bulbs of unknown age (I have no reason to believe they're not original OEMs). I did use LEDs that match the color of the indicator (i.e., blue LED for the high beam, green for neutral, etc.). The LED bulbs were a direct replacement and I had no issues with clearance.

Headlight with integrated turn signals. The stock signals and headlight ears will be removed before long for a much cleaner look.
IMG_4021.HEIC

LED low beam
IMG_4023.HEIC

LED high beam. The blue high beam indicator is pretty dim compared to the other two. With the stock bulb I could just barely see it, so it's still an improvement.
IMG_4024.HEIC

I used warm white LEDs for the gauges. The stock bulbs didn't light them up nearly as well as these LEDs. I'm very happy with this purchase. It's hard to see because of the reflection and it was still somewhat bright outside.
IMG_4025.HEIC

I also got my Cash Machine decals on the tank. I'm really happy with how they turned out.
IMG_3990.HEIC

IMG_3992.HEIC

The bandanna belonged to my late friend Hippy Dave. This way, he still gets to ride.
IMG_3993.HEIC

Next up: Try to band-aid the countershaft seal. Sort out the turn signals. Replace the headlight bucket and ears.
~ Jim

formerly "emperorspartacus"

There are old bikers.  There are dumb bikers.  There are no old, dumb bikers.

My CB650C rebuild http://forums.sohc4.net/index.php?topic=74212.0