Author Topic: Odd cb550 issue  (Read 1095 times)

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Offline l2edken

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Odd cb550 issue
« on: November 17, 2012, 08:47:21 PM »
ill give ya some background... Went for a ride the other day, bike road great until last 5 miles. All of a sudden there were a lot of odd ticking/banging noises come from the head, around valve 4. Got it home and tore it apart. Took the cam cover off to re torque head (fresh rebuild, still breaking it in) and found that the adjuster for the rocker had come loose. The nut fell off and was wedged in between the valve spring on 4 and the head itself. Glad i found the problem and with no signs of damage. When i was placing the cam cover back on i loosened all of the rocker adjusting pins so that i didn't end up getting improper valve contact. Went by the book to readjusted the contact of rockers and valves (intake .002 exhaust .003) Buttoned everything back up and kicked her right over and it fired right up.

However now i don't understand this. The bike is MUCH louder now then ever before. Also doesn't run quite right off the throttle. It idles just fine, but when i give it even a mild twist of throttle it would die. Had to kinda baby it up to rev it.

Now i was thinking about this and was wondering if MAYBE i did the valve adjustment improperly. IE: Set cylinder 1 clearance when actually 4 was at timing mark, set 2 for clearance when actually 3 was at timing mark. Would the bike still run at all if i did this?

Really confused how all of sudden the bike isn't running right... The bike ran better with the nut wedged in between the spring and head then now...


Tell me what ya think guys! wanna be able to ride with this nice weather were getting next week!

Offline luap

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Re: Odd cb550 issue
« Reply #1 on: November 17, 2012, 10:24:16 PM »
The bike is MUCH louder now then ever before. Correct me if Im wrong- Your now firing on all 4 cylinders
"Also doesn't run quite right off the throttle" you check the timing
Now i was thinking about this and was wondering if MAYBE i did the valve adjustment improperly. IE: Set cylinder 1 clearance when actually 4 was at timing mark, set 2 for clearance when actually 3 was at timing mark. Would the bike still run at all if i did this?
you will bend your valves so No
check out the X an O digram in the manual. O will either be loose or  tight an vise versa for X. 2 an 3 will always have a tight arm
I dont have the manual infront of me an cant remember exatally
cylinder 1 X/X
"           2 X/O
"           3 O/X
"           4 O/O
two an three could be flipped someone will let you know
o
75-550 ffsc sold, 78-550 diamonte sold, 125s grasshopper sold, 76-550 puma sold, 78-550 tracker sold, 74-550 verde diablo Sold, 74-550 Noemani finished trying to sell. 72 500 hartail in the works
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Offline l2edken

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Re: Odd cb550 issue
« Reply #2 on: November 17, 2012, 10:53:10 PM »
The bike is MUCH louder now then ever before. Correct me if Im wrong- Your now firing on all 4 cylinders
"Also doesn't run quite right off the throttle" you check the timing
Now i was thinking about this and was wondering if MAYBE i did the valve adjustment improperly. IE: Set cylinder 1 clearance when actually 4 was at timing mark, set 2 for clearance when actually 3 was at timing mark. Would the bike still run at all if i did this?
you will bend your valves so No
check out the X an O digram in the manual. O will either be loose or  tight an vise versa for X. 2 an 3 will always have a tight arm
I dont have the manual infront of me an cant remember exatally
cylinder 1 X/X
"           2 X/O
"           3 O/X
"           4 O/O
two an three could be flipped someone will let you know
o

i was firing on 4 cylinders before, been riding the bike for months now, just last week cylinder 4 exhaust valve loosened up and caused that one to not fire right... Timing is spot on. I set it before and double checked today. I also didnt mess with the timing at all. All i did today was retorque the head and cam cover. Bike ran perfect before i took the cam cover off, this is all new behavior.

Im a bit confused on your X/O diagram, what manual is that in? Clymers? i dont recall that one, please if you can find any info on that it would be amazing!

Offline matt mattison

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Re: Odd cb550 issue
« Reply #3 on: November 18, 2012, 12:46:35 AM »
Which "timing mark" did you set by? The T or the F ?
1975 CB550F
2011 MV Agusta Brutale 1090RR

Offline l2edken

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Re: Odd cb550 issue
« Reply #4 on: November 18, 2012, 08:38:45 AM »
F as per manual suggested

Offline seanbarney41

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Re: Odd cb550 issue
« Reply #5 on: November 18, 2012, 10:07:28 AM »
you did it wrong.  T mark is for TDC, where you want to adjust the valves.  F mark is for FIRE, where you set the timing.  Redo your valve adjustements.  Really, you don't even need any marks, you just have to be sure the rockers are on the base circle of the cam when you adjust.
If it works good, it looks good...

Offline Bailgang

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Re: Odd cb550 issue
« Reply #6 on: November 19, 2012, 02:26:02 PM »
  Really, you don't even need any marks, you just have to be sure the rockers are on the base circle of the cam when you adjust.

+1
Scott


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Offline l2edken

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Re: Odd cb550 issue
« Reply #7 on: November 20, 2012, 03:47:08 PM »
Yup, i screwed up haha... Redid timing, valves adjustment and cam chain tension, babe runs like a dream. Although i did make a new post concerning some different issues im having, thanks a lot guys!