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Author Topic: 79 CB 650 refurb turns resto / mod  (Read 34370 times)

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Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #200 on: March 01, 2012, 08:09:36 pm »
Dude, thanks.  Those will help a lot. I have pics plus Clymer and the Honda service manual.  I managed to catch the location on that plastic piece in #2 and I DID try to make the wrong carb the one to sync to.  I have 2 done except the linkage and I have the air valve in 3.  The linkage seals went back in 2 real nicely the pair for 3 shouldn't be a problem.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #201 on: March 01, 2012, 08:16:42 pm »
I didn't work on carbs as much as I would have liked today but only because I played games with aircraft stripper.  The stuff is amazing.  Two guys in team mode, coldies in hand it took 40 minutes to strip the rest of my tank.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline Jay_kent

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Re: 79 CB 650 refurb turns resto / mod
« Reply #202 on: March 01, 2012, 08:16:52 pm »
Great, glad to help.

When you put that throttle shaft back in, make sure that the tabs on that washer for no. 2 is on the flat spots. Looks like they've turned on you for the shot.

I'll be rebuilding a 2nd set soon so at least there's a lot of notes going around.  ;D
"I am always doing that which I cannot do, in order that I may learn how to do it."
   Pablo Picasso
More pics at my Cafe build blog - Here

Offline thrutheframe

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Re: 79 CB 650 refurb turns resto / mod
« Reply #203 on: March 02, 2012, 07:32:35 am »
  I got the bike put away this morning right before the rain started.  The gods of cycling smile on me with 3 days of tuning and testing runs in February.  That's a huge jump on the riding season.  I'm really pleased to report no significant glitches with the bike. 
 
Today's goals are:
  Get carb 3 assembled and racked back to carb 2
  Install center stand
  Drain carbs and gas tank
  Contemplate removing the head to fix my oil leak

'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #204 on: March 02, 2012, 02:03:46 pm »
Pics... That second choke spring is a tough one to figure out a method.  I set the floats and capped them up. I just need to assemble the other two and rack them. Working tonight.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline Jay_kent

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Re: 79 CB 650 refurb turns resto / mod
« Reply #205 on: March 02, 2012, 06:16:04 pm »
I'm sure there's a trick to that spring but I think I ended up using a dental pick to rotate it around into tension. It can't be the way the did it back then. But the carbs are looking good.
"I am always doing that which I cannot do, in order that I may learn how to do it."
   Pablo Picasso
More pics at my Cafe build blog - Here

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #206 on: March 04, 2012, 03:10:27 pm »
I got my C stand on today, since I had it up in the stand I figured I'd adjust the clutch which felt great when I first got her going but was needing adjustment by the time I put it away.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #207 on: March 04, 2012, 05:48:06 pm »
Tonight
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #208 on: March 05, 2012, 04:40:55 pm »
Body priming and bondo work continue.  I got my new gas cap today as well. I like it because it's metal instead of plastic like my original.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline Jay_kent

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Re: 79 CB 650 refurb turns resto / mod
« Reply #209 on: March 05, 2012, 07:14:32 pm »
you're making good progress
"I am always doing that which I cannot do, in order that I may learn how to do it."
   Pablo Picasso
More pics at my Cafe build blog - Here

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #210 on: March 06, 2012, 03:37:16 pm »
More body work, rode a bunch, enjoyed leak free carbs.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline fastbroshi

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Re: 79 CB 650 refurb turns resto / mod
« Reply #211 on: March 06, 2012, 03:59:39 pm »
  I just noticed your pic with the new gas cap.  It kinda looks out of place with the fitting for the other cap there.  Any plans to remove it?
Just call me Timmaaaaay!!!

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #212 on: March 06, 2012, 04:56:25 pm »
I have the lock mechanism, I'm going to reinstall it.  It would definitely be out of place otherwise.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #213 on: March 15, 2012, 10:56:37 am »
Baby steps.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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Re: 79 CB 650 refurb turns resto / mod
« Reply #214 on: March 18, 2012, 02:02:49 pm »
  I went into the shop today and put a consistent coat of primer on my gas tank.  I was going to sort out a few minor things on the 650 but I found a nice size oil spot under the shifter.  I pulled the sprocket cover off and discovered oil in the little pocket of the cover that contains the oil pump.  That led to my using the ez out on 2 of the 3 6x22mm screws that hold the pump on.  Of course Honda doesnt offer the 46x3mm O-ring for the base of the pump, nor do they show the pump internals or the O-ring for the cap.  I'll be scouring the web and local hardware stores until I find them.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #215 on: March 18, 2012, 02:33:57 pm »
 Not a lot of pics today.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline Swampotter

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Re: 79 CB 650 refurb turns resto / mod
« Reply #216 on: March 18, 2012, 03:32:10 pm »
Looking good.  I'm going to try that airline stripper on my frame.

Offline Jay_kent

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Re: 79 CB 650 refurb turns resto / mod
« Reply #217 on: March 18, 2012, 04:24:05 pm »
That's weird that Honda doesn't supply that o-ring. I bought two last year. Maybe they are discounting it.
Today I pulled the rocker cover off so I could fix a bolt I know was stripped and leaking. Found 3 more stripped. Luckily for me my neighbour (with a Norton, BSA, and a Triumph) just happened to have a helicoil in the size I needed.  ;D

Keep the pics the coming.
"I am always doing that which I cannot do, in order that I may learn how to do it."
   Pablo Picasso
More pics at my Cafe build blog - Here

Offline onepieceatatime

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Re: 79 CB 650 refurb turns resto / mod
« Reply #218 on: March 18, 2012, 06:36:41 pm »
  I went into the shop today and put a consistent coat of primer on my gas tank.  I was going to sort out a few minor things on the 650 but I found a nice size oil spot under the shifter.  I pulled the sprocket cover off and discovered oil in the little pocket of the cover that contains the oil pump.  That led to my using the ez out on 2 of the 3 6x22mm screws that hold the pump on.  Of course Honda doesnt offer the 46x3mm O-ring for the base of the pump, nor do they show the pump internals or the O-ring for the cap.  I'll be scouring the web and local hardware stores until I find them.

Honda was selling the base o-ring a couple months ago, but I bought a bag of them from McmasterCarr. if you give me your address I will send you one. I have not yet found one for the cap though and need one myself.
1972 CB750K
1974 CB450K7
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CM450A
1997 GL1500SE

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #219 on: March 18, 2012, 07:53:20 pm »
PM sent.

Thanks fellas, this was a tiny set back mechanically but the unavailable parts are a PITA. 
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #220 on: March 19, 2012, 03:12:55 pm »
So back to carbs.... Kinda... Been trying to get two accelerator pump circuit o-rings.  My kits included those and the fuel x-over seals but only 1 for each carb.  By my measurement they are 2mm ID x 1.5mm thick. Thanks to onepiece's comment about ordering o-rings I decided to order those and the cap seal for my oil pump from McMaster Carr.  (duh). Once I'm sure it's correct I'll be happy to share with whomever.  Just PM me your address and I'll put one in a regular letter size envelope in a parts bag.
  Now today's real stumper...  I'm missing one of these springs.  It's from carb 4 at the knuckle in the linkage arm.  I dropped it in the floor and it never came back despite magnet sweeps and rooting through the dust pan.  I have another set of PD 50As but I don't want to rob parts off of them since they are currently on the bike and they are working very nicely other than they are very rich with 120 main and 44 pilots PLUS the air cut off circuits bypassed with JB weld.  Can anyone give me an idea of where I can get one or 12?
« Last Edit: March 19, 2012, 03:15:50 pm by thrutheframe »
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline onepieceatatime

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Re: 79 CB 650 refurb turns resto / mod
« Reply #221 on: March 19, 2012, 05:27:03 pm »
  Now today's real stumper...  I'm missing one of these springs.  It's from carb 4 at the knuckle in the linkage arm.  I dropped it in the floor and it never came back despite magnet sweeps and rooting through the dust pan.  I have another set of PD 50As but I don't want to rob parts off of them since they are currently on the bike and they are working very nicely other than they are very rich with 120 main and 44 pilots PLUS the air cut off circuits bypassed with JB weld.  Can anyone give me an idea of where I can get one or 12?

I have a set of parts carbs. When I get a chance I will see if those springs are in there. If they are, I'll throw one in with the o-ring for the pump base. I'll try to get it sent out tomorrow.
1972 CB750K
1974 CB450K7
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CM450A
1997 GL1500SE

Offline cb650

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Re: 79 CB 650 refurb turns resto / mod
« Reply #222 on: March 19, 2012, 05:39:43 pm »
FYI  As for the oil pump oring I bought one in a assortment pack from checkers.  now orileys.
18 grand and 18 miles dont make you a biker

Offline thrutheframe

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79 CB 650 refurb turns resto / mod
« Reply #223 on: March 19, 2012, 06:08:05 pm »
CB650 you verify the size?  Bike bandit lists it as 43x3.
'74 cb 750 K4
'79 CB 650 http://forums.sohc4.net/index.php?topic=83981.0
'75 CB 360T
'90 RC31 Hawk GT

Offline onepieceatatime

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Re: 79 CB 650 refurb turns resto / mod
« Reply #224 on: March 19, 2012, 06:12:40 pm »
I know 45mm is too big, so 43mm is probably close. If it is a round o-ring instead of square, 3 is too thick and will not let the cover fit down properly (at least on my 1980 oil pump).
1972 CB750K
1974 CB450K7
1977 CB750K
1977 CB750K
1978 CB400A
1980 CB650C
1980 CB650
1982 CM450A
1997 GL1500SE

 

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