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Offline blakes1975

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1975 cb550
« on: August 23, 2013, 07:22:52 AM »
So the clips for the main jets are already in, 

i have stock slow jets   #38
stock main jets #98
and stock exhaust and air box

how do i tune ??????????
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Offline mono

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Re: 1975 cb550
« Reply #1 on: August 23, 2013, 07:37:37 AM »
step 1:  download the service manual - it should detail the stock tuning procedure.
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Offline goldarrow

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Re: 1975 cb550
« Reply #2 on: August 23, 2013, 07:38:00 AM »
Stock main jets should be 100, needle clips 4th groove from top, a/f screws about 1 1/8 turns out.  Carbs 022A.  If stock exhaust and air filter.  Those should be your base settings for tuning.
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Offline mono

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Re: 1975 cb550
« Reply #3 on: August 23, 2013, 07:57:13 AM »
Quote from: goldarrow on August 23, 2013, 07:38:00 AM
Stock main jets should be 100, needle clips 4th groove from top, a/f screws about 1 1/8 turns out.  Carbs 022A.  If stock exhaust and air filter.  Those should be your base settings for tuning.

you forgot float heights, encyclopedia brown ;)
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Offline Bankerdanny

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Re: 1975 cb550
« Reply #4 on: August 23, 2013, 08:15:40 AM »
Which 550 do you have, a K or an F?  Those are the correct jets for a 550F
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Offline Duanob

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Re: 1975 cb550
« Reply #5 on: August 23, 2013, 08:41:47 AM »
Quote from: Bankerdanny on August 23, 2013, 08:15:40 AM
Which 550 do you have, a K or an F?  Those are the correct jets for a 550F

And tuning is a bit different. Needle clip position is 2nd from the top. Carb # 069A
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Offline Scott S

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Re: 1975 cb550
« Reply #6 on: August 24, 2013, 04:15:32 AM »
Quote from: blakes1975 on August 23, 2013, 07:22:52 AM


how do i tune ??????????


 Start with a valve adjustment, cam chain adjustment and setting the timing. Make sure you have a fully charged battery.
 Then, and only then, should you attempt carb tuning.

 Set the idle mixture screws per the chart above. Get it warm and get it to idle. Then you can vacuum synch and adjust mixture screws.
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Offline blakes1975

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Re: 1975 cb550
« Reply #7 on: August 25, 2013, 11:01:30 AM »
i believe its the F its a four cylinder 4 into 1 exhaust the guy at honda said its the F not a super sports.  cause super sports go 4 in to 4. 
so the proper jet is 98 then or 100? cause i'll drill the 98 out to a 100 if i have to.  there hard to find
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Offline blakes1975

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Re: 1975 cb550
« Reply #8 on: August 25, 2013, 11:03:10 AM »
ok saw the charts you guys posted the 98 main jet is the proper jet>>>>. 
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Offline TwoTired

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Re: 1975 cb550
« Reply #9 on: August 25, 2013, 11:18:28 AM »
Quote from: blakes1975 on August 25, 2013, 11:01:30 AM
i believe its the F its a four cylinder 4 into 1 exhaust the guy at honda said its the F not a super sports.  cause super sports go 4 in to 4. 
so the proper jet is 98 then or 100? cause i'll drill the 98 out to a 100 if i have to.  there hard to find

Nope the super sport has the 4 to 1 from the factory.  This was the F model, made 75-77 in the us.  All had 069A carbs.  It would be stupid to drill the jets, imo.  ...Particularly if the exhaust is still stock.

The K models had 4 to 4 exhaust.
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Offline blakes1975

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Re: 1975 cb550
« Reply #10 on: August 25, 2013, 11:30:41 PM »
the article you show the colors are fancy mine is just black ???????? i have to break down the vin into the codes to see what it is i'll let you know.

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Offline Bankerdanny

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Re: 1975 cb550
« Reply #11 on: August 26, 2013, 01:22:48 PM »
The 'guy at honda' clearly doesn't know what he is talking about. It is probably best that you not go to that dealer for advice again, or at least not that person.

F is the model designation for the SOHC4 Super Sport bikes. Here we typically just call Super Sports F bikes, because it's easier to type F than Super Sport.

If you look at the VIN tag on the right side of the steerling head it should say 1975 CB550K or CB550F. The former is a 4-4 bike, the later is the 4-1 bike. The F's say Super Sport on the tank.
« Last Edit: August 26, 2013, 01:27:23 PM by Bankerdanny »
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Current: '76 CB750F. Previous:  '75 CB550F, 2007 Yamaha Vino 125 Scooter, '75 Harley FXE Superglide, '77 GL1000, '77 CB550k, '68 Suzuki K10 80, '68 Yamaha YR2, '69 BMW R69S, '71 Honda SL175, '02 Royal Enfield Bullet 500, '89 Yamaha FJ1200
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