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Author Topic: 78 cb550k. Throttle slide height for first start??  (Read 1035 times)

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Offline evopgt

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78 cb550k. Throttle slide height for first start??
« on: May 25, 2017, 09:14:32 AM »
 ???   Hey guys. Getting ready to crank over the cb550 for the first time since ripping it apart.  My ? Is how open should the throttle slides be for initial start up?? I can adjust later with the idle screw, just need to know where to start.
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Offline flybox1

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #1 on: May 25, 2017, 09:22:23 AM »
Turn your idle set screw in 1.5 full turns from zero, and give it full choke.
Hit it.


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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline BomberMann650

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #2 on: May 25, 2017, 09:24:11 AM »
Its different for each bike.

A bench sync would have been a good place to start.  Do you have the manual?

Use the choke, hold the throttle, and press the start button.  You have to listen and feel for when these motors want to catch spark and run.  Just a little twist.

When you're running.  Then try to set the big idle screw knob.  A well tuned 550 will purr around 1100-1500 rpm.
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Offline Bankerdanny

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #3 on: May 25, 2017, 10:08:35 AM »
Assuming your bike has its original carbs, your choke includes a fast idle cam that raises the slides slightly at full choke. You shouldn't need to do anything with the throttle when starting the bike.
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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

Offline BomberMann650

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #4 on: May 25, 2017, 10:33:49 AM »
Quote from: Bankerdanny on May 25, 2017, 10:08:35 AM
Assuming your bike has its original carbs, your choke includes a fast idle cam that raises the slides slightly at full choke. You shouldn't need to do anything with the throttle when starting the bike.

I don't think the 550's have that feature. At least not the A series equipped models. 
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Offline Bankerdanny

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #5 on: May 25, 2017, 10:38:25 AM »
My '77 did and I don't  think the changes to the 78 carbs included removing it.
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

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

Offline flybox1

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #6 on: May 25, 2017, 10:42:16 AM »
Is a feature on PDs
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'78 750K (F3 engine) PD42b's, Modified airbox w/K&N  filter, 40/110 jets, 1 needle shim, IMS@ 1 turn out. Kerker + Cone 18" QuietCore

Past Bikes
1974 550K0 (stock), 1973 CB350F (stock), 1983 Yamaha XS400K (POS)
77/78 cool 2 member #3
"Knowledge without mileage equals bullsh!t" - Henry Rollins

"This is my CB. There are many like it, but this one is mine…"

Offline BomberMann650

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #7 on: May 25, 2017, 10:49:56 AM »
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Offline Bankerdanny

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #8 on: May 25, 2017, 11:49:06 AM »
Only the 77-78 K models have them.
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"The problem with quotes on the Internet is that you never know if they're true" - Abraham Lincoln

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

Offline evopgt

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Re: 78 cb550k. Throttle slide height for first start??
« Reply #9 on: May 25, 2017, 01:04:25 PM »
Thanks guys
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