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March 3rd, 2018, 11:07 AM   #1
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Valves or maybe carb

Hi folks,

I've got a 2008 FE550 that is running well but could be better. I had quite a loud top end rattle so I checked cam chain tensioner, it has about half way left to go. I checked and adjusted valve clearances to 1/6th turn. The intakes were perfect but the exhausts were way loose, I didn't count but they were probably close to 1 full turn out. After this adjustment, the rattle was totally cured. But it introduced a popping/backfiring on deceleration that I never had before.

I hadn't ridden the bike in a couple of months before this so I'm wondering if the popping is the bike running lean because of colder winter air? I played with the fuel screw but didn't make any difference.

Other things that may be related - I have a bog when I stab the throttle at idle or at low RPM (I found a tutorial about checking/adjusting the accelerator pump that I am going to follow), and this is kinda hard to describe... but first and second gear feel like they don't have much go in them before they top out and they are kind of tinny and rattly. Then third and fourth gear pull my arms out of their sockets and feel full and healthy.

Any ideas or suggestions about any of this much appreciated I was looking at the Taffy carb kit, might give me a better running bike and fix some of these issues at the same time??

Cheers
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March 3rd, 2018, 08:47 PM   #2
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Check the can follower bearings, they tend to destroy the cam and sometimes you get a broken rocker arm just for good measure. Valve clearance becomes tighter over time, not loose, unless the lock nut on the tappets come loose. A worn follower bearing could be the reason the clearance was larger, unless of course it was set like that before...
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March 4th, 2018, 02:11 AM   #3
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Originally Posted by WArdogG View Post
Check the can follower bearings, they tend to destroy the cam and sometimes you get a broken rocker arm just for good measure. Valve clearance becomes tighter over time, not loose, unless the lock nut on the tappets come loose. A worn follower bearing could be the reason the clearance was larger, unless of course it was set like that before...
Cheers WArdogG, looks like there is space to get the rocker cover off with the engine in the frame?
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March 4th, 2018, 06:45 AM   #4
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Yeah, you can. It is easier if you take the radiator out tho', and less chance of damaging the radiator whille swingin tools around there
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March 4th, 2018, 07:52 AM   #5
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never removed the radiator on any of them.
while you're in there, visually check bearings on the cam
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March 4th, 2018, 01:03 PM   #6
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Originally Posted by ned37 View Post
never removed the radiator on any of them.
while you're in there, visually check bearings on the cam
Thanks folks. The only bearings I see in the schematic is #15 here, are those the ones you mean?

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March 4th, 2018, 08:43 PM   #7
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No, check the scematic for the valves
On each of the rocker shafts is a cam follower bearing.
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Valves or maybe carb-valves.gif  
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March 4th, 2018, 08:47 PM   #8
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Those bearings in your schematic #15 are the ones Ned are referring to.
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March 4th, 2018, 11:52 PM   #9
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the cam follower bearings are mounted in the end of the rocker arm and run on the camshaft. they get knocked out.

if you have a really good tool box you can leave the radiator on but ned has had 70 years to play with his tools correctly!

McIjot
you need to start with an extended pilot screw (EPS) and fit it under the carb. adjustment of this will probably cure the popping. the fuelling can be beaten with my kit and a new EPS is in it.

regards

Taffy
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March 5th, 2018, 05:46 AM   #10
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ned has had 70 years to play with his tools correctly
..and i enjoy playing with them almost daily
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