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Author Topic: My new Hondamatic cb750a for $500  (Read 2618 times)

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Offline Bellard

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My new Hondamatic cb750a for $500
« on: June 30, 2011, 05:13:50 AM »
Today me and my father picked up a sweet deal. The gas tank is in great condition no dents minor rust.. anyways we fired her butt up last night woke a few neighbors. We started her without filters with half choke to add restriction. We want to use the stock filter system Because I hear you should. Problem is... its hard as hell to put on due to room. Any ideas on this problem?
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline madmtnmotors

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Re: My new Hondamatic cb750a for $500
« Reply #1 on: June 30, 2011, 05:22:57 AM »
Install just the top half of the filter box first (all bolted up), then slide the bottom half in and attach it to the top half. If the airbox boots to carb body are giving you fits they may be age/heat distressed and may need replaced. Reconditioning them might help (search "wintergreen") but I know the new airbox horns made my 750K model much smoother to install.

Congrats on the new aquisition!
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline tango911

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Re: My new Hondamatic cb750a for $500
« Reply #2 on: June 30, 2011, 05:27:30 AM »
pics plz :)  congrats
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CURRENT STABLE:
1969 Honda Dream 305 (black)
1974 Mach III kawi 500 smoker
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Offline Bellard

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Re: My new Hondamatic cb750a for $500
« Reply #3 on: June 30, 2011, 06:14:39 AM »
All the boots are in great condition the airbox is culkened I guess to seal it better.. I guess PO was extra caucious ill post up pics today thanks guys
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline madmtnmotors

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  • Posts: 6,117
  • Sunny Central Florida
Re: My new Hondamatic cb750a for $500
« Reply #4 on: June 30, 2011, 06:37:35 AM »
Ahhh... you definitely need to split the upper and lower halves of the airbox, both for ease of install and to inspect the condition of the filter.
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TAMTF...


Wilbur



Projects:
"Evolution": http://forums.sohc4.net/index.php?topic=100352.0
"P.O. Debacle": http://forums.sohc4.net/index.php/topic,126692.msg1441661.html#msg1441661
F2/F3 O-rings: http://forums.sohc4.net/index.php?topic=113672.msg1300721#msg1300721
Cam Tower Studs: https://www.mcmaster.com/#93210a017/=t19sgp
Clean up that nasty harness: http://forums.sohc4.net/index.php?topic=137351.msg1549191#msg1549191
http://forums.sohc4.net/index.php/topic,148188.msg1688494.html#msg1688494
http://forums.sohc4.net/index.php/topic,139544.msg1579364.html#msg1579364
                                          
Charging system diagnosis: http://forums.sohc4.net/index.php?topic=1012.msg8345#msg8345
Get the manuals: http://manuals.sohc4.net/cb750k/
The Dragon: http://forums.sohc4.net/index.php?topic=45183.msg1571675#msg1571675
Headlight Switch: http://forums.sohc4.net/index.php?topic=113986.msg1283236#msg1283236
Branden's leak free top end thread: http://forums.sohc4.net/index.php?topic=107040.0
Engine Lifting Made Easy: http://forums.sohc4.net/index.php/topic,58210.msg1684742.html#msg1684742
                                      http://forums.sohc4.net/index.php/topic,100352.msg1675840.html#msg1675840
Static and Dynamic Timing: http://www.hondachopper.com/garage/carb_info/timing/timing1.html
Airbox Gasket Replacement: http://forums.sohc4.net/index.php/topic,114485.msg1290000.html#msg1290000
"Café" : http://forums.sohc4.net/index.php/topic,84697.msg953814.html#msg953814
PD Carb Choke Linkage: http://forums.sohc4.net/index.php/topic,100352.msg1669248.html#msg1669248
                                    http://forums.sohc4.net/index.php/topic,110931.msg1248354.html#msg1248354
                                    http://forums.sohc4.net/index.php/topic,48858.msg515204.html#msg515204
Follow up on your damn posts: http://forums.sohc4.net/index.php/topic,144305.msg1791605.html#msg1791605
Taiwanese Cam Chain Tensioners:  http://forums.sohc4.net/index.php/topic,155043.msg1774841.html#msg1774841
Gumtwo Seat Cover: http://forums.sohc4.net/index.php/topic,164440.msg1897366.html#msg1897366
Primary Drive: http://forums.sohc4.net/index.php/topic,166063.msg1919278.html#msg1919278
Tank Latch: http://forums.sohc4.net/index.php/topic,165975.msg1919495.html#msg1919495
Shorten your forks: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-shorten-forks-td4042465.html DO NOT CUT THE SPRINGS!
Clutch How To: http://vintage-and-classic-honda-s.456789.n3.nabble.com/How-to-change-and-adjust-a-clutch-SOHC-td4040391.html
Late model K7/K8/F2/F3 front sprocket cover removal: http://forums.sohc4.net/index.php/topic,178428.msg2072279.html#msg2072279
630 to 530 conversion: http://forums.sohc4.net/index.php/topic,180710.msg2094423.html#msg2094423

Sent from my Tandy TRS-80!

Offline Bellard

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Re: My new Hondamatic cb750a for $500
« Reply #5 on: June 30, 2011, 07:38:56 AM »
Thanks for tips guys I definitely need them . This shall be the first thing I do when i get home -grin- ill take some pictures and video if I can get her started last night. I got her started roughly for 40 seconds damn was she loud. I had two pods on 1st and 2nd cylinders were backfiring a tiny bit but that's cause they werent upjetted I just wanted to see if it cranked up. And she did without accelerate pump working. Then I realized I needed stock filter to utilize it.

Keep on a look out for pics
Btw where should I start a project log?
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline Sam Green Racing

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Re: My new Hondamatic cb750a for $500
« Reply #6 on: June 30, 2011, 08:53:40 AM »
Start it here or in the Project shop forum. Congrats on the new deal, wishing you many miles of safe riding.

Sam. ;)
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Offline Bellard

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Re: My new Hondamatic cb750a for $500
« Reply #7 on: June 30, 2011, 10:09:23 AM »
Thank you Sam! :)
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline Bellard

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Re: My new Hondamatic cb750a for $500
« Reply #8 on: June 30, 2011, 10:13:43 AM »
Question I know the main jets are screwed in above that is the slow jet.. is this screwed in or pulled out?
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline Bellard

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Re: My new Hondamatic cb750a for $500
« Reply #9 on: July 01, 2011, 07:00:09 AM »
Update...
Ok so I was fiddling with the bike last night. I noticed left side mufflers backfires.  I have a blown head gasket... oil seeping out.. left side carbs draining out of over flow ... but good news is electrical I'd good ;)
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Currently I own
1977 CB750A
1977 CB550K
1971 CB350K3

Offline Bill/BentON Racing

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    • BentON Racing
Re: My new Hondamatic cb750a for $500
« Reply #10 on: July 04, 2011, 07:01:07 AM »
Congrats,the pleasure of working on 35+ year old motorcycles! ::)You got a good deal sounds like.I bought a non runner parts bike last year for $300.00.
Have some spare parts...Good luck! Bill
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