Author Topic: No start...its spring...PD Carb  (Read 21565 times)

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Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #25 on: April 10, 2014, 03:03:39 PM »
It did come out though

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline harisuluv

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Re: No start...its spring...PD Carb
« Reply #26 on: April 10, 2014, 03:17:50 PM »
Ok, if I am seeing this correctly, you tried to physically remove the accelerator pump nozzle/squirter?

These are pressed in.  I have never heard of someone removing them, and this is not necessary to clean them.  Replace the body now, and don't try that again.  Besides if from what I've read you are having problem just starting and staying running.  You are going down the wrong rabbit holes, as is often the case with these carb threads.

If you need a new body PM me with the casting number, it's on the side of the carb where it meets the bowl.  If you can't find it google where it's at.

There was an old post on the accel pump tubes where someone took some incorrect measurements and then that info seemed to spread.

The CORRECT measurements for the accel pump restrictor tubes is:

ID: 2mm 
OD: 4mm




Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #27 on: April 10, 2014, 03:26:53 PM »
Wow. Im done with its carb....lesson learned...and others..make sure to double check what others have said.

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« Last Edit: April 11, 2014, 07:16:12 AM by Sdsbassist »
Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #28 on: April 10, 2014, 04:24:50 PM »
Ok that was harsh. Maybe I will have to take a step back. Im assuming my most economical option is to get the carb bodies

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline harisuluv

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Re: No start...its spring...PD Carb
« Reply #29 on: April 10, 2014, 05:04:00 PM »
Yeah I don't really see anyone mentioning touching the nozzles.  I think you were/are unfamiliar with terminology and misunderstood instructions because of that.

You might want to take a step back and slow down. 

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: No start...its spring...PD Carb
« Reply #30 on: April 10, 2014, 05:55:09 PM »
Amen brother. She will ride again

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Stev-o

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Re: No start...its spring...PD Carb
« Reply #31 on: April 10, 2014, 06:59:04 PM »
If I were you, I would send those carbs to Harisluv and let him work his majic
« Last Edit: April 10, 2014, 08:57:57 PM by Stev-o »
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: No start...its spring...PD Carb
« Reply #32 on: April 10, 2014, 08:38:09 PM »
I pmd him.

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: No start...its spring...PD Carb
« Reply #33 on: April 11, 2014, 07:16:47 AM »
I may go the carb body route. Any good instructional on how to remove parts of the carb from the rack?
Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: No start...its spring...PD Carb
« Reply #34 on: April 11, 2014, 04:20:09 PM »
I should rephrase. How would I go about removing carb body number 2?

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline lucky

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Re: No start...its spring...PD Carb
« Reply #35 on: April 12, 2014, 10:48:20 AM »
I really think you should send your carbs to Harrisluv before  they are ruined.





Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #36 on: April 12, 2014, 11:32:45 AM »
Ok. Im looking at options now...tearing apart the carbs is not one of thpse options.

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #37 on: April 13, 2014, 11:31:06 AM »
so a local guy who ended up being pretty cool sold me a nice set of PD carbs for 100 bucks.

clean them out being much more careful this time put in the new diaphragm tested it and it squirts gas out of all for four nozzles. Air screw turned out 1.75

its a lot closer to starting but it still stumbles and is unable to totally get going ... I'm wondering now if I need to look at my timing. here's a video of what's happening when I try to start it.

https://www.youtube.com/watch?v=S972Z2vwc6Y&feature=youtube_gdata_player

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« Last Edit: April 13, 2014, 11:33:51 AM by Sdsbassist »
Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #38 on: April 13, 2014, 03:06:55 PM »
Could would the airscrew setting affect starting as well?

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #39 on: April 13, 2014, 05:01:42 PM »
Finally :)

screw is at 1.25 turns with half an airbox (dont ask).

Cleared things out one more time and wham..fired up. Let it run for a bit on choke and it started to rev up and was eventually able to run no choke. Now its just minor adjustments.https://www.youtube.com/watch?v=Qnd67tI6atY&feature=youtube_gdata_player

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« Last Edit: April 13, 2014, 05:03:49 PM by Sdsbassist »
Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Stev-o

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Re: No start...its spring...PD Carb
« Reply #40 on: April 13, 2014, 05:56:52 PM »
Ok, you're on your way.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: No start...its spring...PD Carb
« Reply #41 on: April 13, 2014, 06:56:26 PM »
I can see, when dialed in, why the PDs could be cool.

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Stev-o

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Re: No start...its spring...PD Carb
« Reply #42 on: April 14, 2014, 07:51:23 AM »
I can see, when dialed in, why the PDs could be cool.




Why?  I don't necessarily think so.
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline AintNoEasyWay

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Re: No start...its spring...PD Carb
« Reply #43 on: April 14, 2014, 10:58:12 AM »
Haha what a thread. flybox gives some great info on the first page! When replacing brass tubes inside the accel pump lines, does order matter? For example, does one diameter go on the left of the line & other on the right?

Offline harisuluv

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Re: No start...its spring...PD Carb
« Reply #44 on: April 14, 2014, 11:15:50 AM »
there is only one size diameter.  Again, the tubes are ID 2mm, OD 4mm.

The only differences in the tubes is that the middle one has slightly longer length because the rubber tube is bigger between 2 and 3

Offline TwoTired

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Re: No start...its spring...PD Carb
« Reply #45 on: April 14, 2014, 11:16:51 AM »
I can see, when dialed in, why the PDs could be cool.

Why?  I don't necessarily think so.

I do.  I like the fast idle cam.  And, the accelerator pump on the 750's.  When dialed in, the PD's work as well or better than the earlier carbs. 
Lloyd... (SOHC4 #11 Original Mail List)
72 500, 74 550, 75 550K, 75 550F, 76 550F, 77 550F X2, 78 550K, 77 750F X2, 78 750F, 79CX500, 85 700SC, GL1100

Those that learn from history are doomed to repeat it by those that don't learn from history.

Offline AintNoEasyWay

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Re: No start...its spring...PD Carb
« Reply #46 on: April 14, 2014, 11:28:29 AM »
there is only one size diameter.  Again, the tubes are ID 2mm, OD 4mm.

The only differences in the tubes is that the middle one has slightly longer length because the rubber tube is bigger between 2 and 3

Thanks for clearing that up harisuluv.

When dialed in, the PD's work as well or better than the earlier carbs.

In before Lucky's rant on PD carbs.  8)
« Last Edit: April 14, 2014, 11:30:43 AM by AintNoEasyWay »

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #47 on: April 14, 2014, 03:39:23 PM »
Oh no. what have I done :-\

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"

Offline Stev-o

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Re: No start...its spring...PD Carb
« Reply #48 on: April 14, 2014, 04:03:44 PM »
Oh no. what have I done :-\




ruined a good carb
'74 "Big Bang" Honda 750K [836].....'76 Honda 550F.....K3 Park Racer!......and a Bomber!............plus plus plus.........

Offline Sdsbassist

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Re: No start...its spring...PD Carb
« Reply #49 on: April 14, 2014, 04:13:44 PM »
so went out to start today and nothing. Excel pump not working again today so cut a bigger hole and reassembling now we'll see what happens.

does it help to prime it?

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Gus, Austin, MN.
Current Bike:  75 750F

Past bikes: 76 750K - "Iowa Blue",78 750K Craigslist find - "Black Beth;" 77 CB750K Basketcase, with a 75K engine; 1970 Cb750 K1, "Rosa Luxembourg"
74 cb750, 75 cb550, 77 kawa 650, 81 virago 750, 83 virago 920, 80 Honda Twinstar 200, 71 Honda CT70, 1971 Honda CB750 Rat Project "Black Dahlia Bitsa"