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Offline cb550inct

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Re: Top speed
« Reply #25 on: August 24, 2011, 04:15:05 PM »
Quote from: CBGhia on August 24, 2011, 09:08:52 AM
Yes mains, but if you are already at 110's, you have got to find out what else is going on.  You should be ripping up to 100mph, even with pods.   I am running a 4-1 105's and a stock airbox with uni filter and I can do 100 all day.

Im running the same set up, jets uni in the stock air box my 4 into 1 is a yoshi replica........did you move you needle down one notch, my bikeis running slightly too rich.
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1978 cb550k
1998 Harley Springer Softail
2004 Harley Heritage Softtail (sold)
2001 Vespa 150 (sold)
1980 Kawasaki Kx 80  (first Bike)

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Top speed
« Reply #26 on: August 24, 2011, 04:16:52 PM »
Is it open pipe
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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: Top speed
« Reply #27 on: August 24, 2011, 04:31:08 PM »
So tomorrow if my plugs come out dark would it be better to try jets first or needle?
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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 WarwickE36

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Re: Top speed
« Reply #28 on: August 24, 2011, 05:12:25 PM »
If they are rich, I would try needling down a position, then another if the first change helps. 

If lean, move needle up, or put the baffle in if you have it.
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline SHELLFISH

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Re: Top speed
« Reply #29 on: August 24, 2011, 05:28:56 PM »
When new my 1976 550F hit 112 mph flat out with no head wind.
The only mod was a Kerker exhaust.
Had a buddy with the identicle bike; he was right along side of me!

I haven't tried it since; maybe I should?
Naw, I'm too old now and don't even want to try!
« Last Edit: August 24, 2011, 05:35:07 PM by SHELLFISH »
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I want to die like my grandfather did...in his sleep and not screaming like the passengers in his car!

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Top speed
« Reply #30 on: August 24, 2011, 06:08:13 PM »
The plugs are a nice tan at idle. Im interested to see what happena tomorrow.
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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 shizzomynizzo

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Re: Top speed
« Reply #31 on: August 24, 2011, 08:29:29 PM »
Just my opinion, but 110 are not large enough for an open exhaust and pods. You are supposed to start 2 sizes up for each of those mods...105 is stock, so 115 is what you should have started with.

I am almost certain they will be lean tomorrow. Not sure if that will "cure" your problem, but its worth a try. As was mentioned before, a baffle will help significantly. There are many guys who break down and return the oem box and filter when they can't get it tuned right. I chose velocity stacks instead of pods and have a yoshi repro exhaust with the baffle. 110 are where I started and it's still not perfect.

Too much going on now to finish it up tho. maybe over the winter
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1985 XLX Last of the IH
2001 Street Glide

Offline Sdsbassist

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Re: Top speed
« Reply #32 on: August 24, 2011, 08:43:26 PM »
I think if im running lean letting in more with the 120s will help kick it over the hump. It would make sense. If I can get her to go 80 i'll be happier than a pig in poo
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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 crazypj

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Re: Top speed
« Reply #33 on: August 24, 2011, 09:10:22 PM »
Quote from: Sdsbassist on August 23, 2011, 05:08:02 PM
My situation is on the highway 5th gear goin 63 at 4k to 5k rpms. Do I just ride in 4th gear higher rpm?

 I think your in the wrong section.
63mph is about right for a CB125
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I fake being smart pretty good
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Offline Sdsbassist

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Re: Top speed
« Reply #34 on: August 24, 2011, 09:35:59 PM »
Gee, thanks
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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 phil71

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Re: Top speed
« Reply #35 on: August 25, 2011, 02:17:30 AM »
you've got something else going on here. The 'losing oomph' reeks of fuel starvation, and not just the kind underjetting will cause. You sure the petcock/tank is able to replenish the bowls fast enough at WOT?
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Offline Sdsbassist

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Re: Top speed
« Reply #36 on: August 25, 2011, 04:26:14 AM »
Is there a tube vent that comes from a stock tank? Maybe today before I do the chop I will try unscrewing my cap...
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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: Top speed
« Reply #37 on: August 25, 2011, 05:23:16 AM »
Here are the results. If you ask me, the white tips say lean at wot. Agree? So now up to 120mains or needle adjuasment? In 5th gear I was pullinjust shy of 5k just above 60mph.

 

 

 


 
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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 WarwickE36

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Re: Top speed
« Reply #38 on: August 25, 2011, 05:23:25 AM »
In my experience fuel starvation would cause a buck and surge.  I have left my petcock closed and gotten on the highway, it bucked and surged noticeably before it stalled.  Maybe not in all cases but I would assume it would.
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline WarwickE36

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Re: Top speed
« Reply #39 on: August 25, 2011, 05:24:38 AM »
almost looks like the last pic the plug isn't firing at all.
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Top speed
« Reply #40 on: August 25, 2011, 05:28:08 AM »
Agreed. Think I didn't put cap on all tight. I checked for spark and it lit. Could see it even with Te beautiful Minnesota sun shining. What are the thoughts? Im gonna drive home now.gotta love smartphones!
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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 m in sc

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Re: Top speed
« Reply #41 on: August 25, 2011, 05:53:54 AM »
way back i had one with pods and an open pipe.. i ran 130 mains and it was fine. just chaging the pipes dropped it back to 115's. do something about the exhaust or jet er up. 63? I had a 70CC indian dirtbike that would hit 60.
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Offline Sdsbassist

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Re: Top speed
« Reply #42 on: August 25, 2011, 05:56:03 AM »
Interesting side note: checked again for spark color when I get home and that same plug looks pretty clean. Hooked it up to wire and spun and let out spark like mad. is it possible for it to burn that clean?

Pic of plug

 

Video of it sparking

 http://static.photobucket.com/player.swf?file=http://vid1118.photobucket.com/albums/k614/derikgustafson/VIDEO0008.mp4
« Last Edit: August 25, 2011, 06:01:24 AM by Sdsbassist »
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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 cb550inct

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Re: Top speed
« Reply #43 on: August 25, 2011, 06:06:24 AM »
Quote from: shizzomynizzo on August 24, 2011, 08:29:29 PM
Just my opinion, but 110 are not large enough for an open exhaust and pods. You are supposed to start 2 sizes up for each of those mods...105 is stock, so 115 is what you should have started with.

I am almost certain they will be lean tomorrow. Not sure if that will "cure" your problem, but its worth a try. As was mentioned before, a baffle will help significantly. There are many guys who break down and return the oem box and filter when they can't get it tuned right. I chose velocity stacks instead of pods and have a yoshi repro exhaust with the baffle. 110 are where I started and it's still not perfect.

Too much going on now to finish it up tho. maybe over the winter

On what cb550 are 105's stock that is total mis information somwhere on this sight is a carb chart for all 550's im pretty sure 1975-76 has 100 mains and 77-78 had 90's different carb set up
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1978 cb550k
1998 Harley Springer Softail
2004 Harley Heritage Softtail (sold)
2001 Vespa 150 (sold)
1980 Kawasaki Kx 80  (first Bike)

Offline Sdsbassist

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Re: Top speed
« Reply #44 on: August 25, 2011, 06:08:42 AM »
Yea 100 mains. Im going to install my 120s and see what happens. Im assuming this has the possibility of giving me extra oomph at WFO
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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 WarwickE36

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Re: Top speed
« Reply #45 on: August 25, 2011, 06:52:56 AM »
Maybe your float height is off and that bowl is empty.  Drain each bowl and measure the volume of gas.
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" Why does anyone get offended by what someone does to their own bike? I dont get it. "

You made me think about it after I cheered knowing someone else would like to know what these control freaks are up to.
 Every time any owner strips whatever precious Honda part the horrified purists parts go up in value. That's not the part that bothers them.
 What bothers them is they sat up late at night, their breast full of wonder and estrogen, unable to sleep, dreaming about their lovely darling and all her glory... and next thing you know someone else doesn't share their emotional deluge and their reaction is they must spread their mind museum as far as they possibly can, taking over as much of the real world as possible.

Drink fast, drive slow, but ride it like you stole it

1974 Cb550 with style
2004 SV650s

Offline Sdsbassist

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  • Gus, Austin, MN.
Re: Top speed
« Reply #46 on: August 25, 2011, 06:59:47 AM »
Sure. Gonna check all that crap when I change jets. I have new float gaskets coming too. That should get the fuel level right in the bowl too
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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: Top speed
« Reply #47 on: August 25, 2011, 07:48:51 AM »
If that plug lacks the burns like that, it could also explain the lag under load. Excited to see how it all goes
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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: Top speed
« Reply #48 on: August 25, 2011, 10:04:06 AM »
Quote from: WarwickE36 on August 25, 2011, 06:52:56 AM
Maybe your float height is off and that bowl is empty.  Drain each bowl and measure the volume of gas.

Youre the winner. Float was stuck up by incorrectly installed gasket. Bet she'll go a hell of a lot faster with 3 cyl properly jetted.
 :o
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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 phil71

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Re: Top speed
« Reply #49 on: August 25, 2011, 10:11:54 AM »
lacks the burns?
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