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August 7th, 2019, 05:04 PM   #1
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First Valve adjustment best way to get tdc??

Hey just wondering if anyone could give me some info on getting the motor to top dead Center to adjust the valves. This is my first time checking valves so any info would be greatly appreciated. I got rad and valve covers off now just need to figure out how to properly get TDC?? My bike is a 2004 husaberg 450 fe
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August 7th, 2019, 10:45 PM   #2
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Here is One way to do it:



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August 7th, 2019, 10:48 PM   #3
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You will notice while turning flywheel that the valves will open after another with pistong moving through intake and exhaust stroke but then move upwards without any valves opening, that your true TDC

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August 7th, 2019, 11:31 PM   #4
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Originally Posted by Chrisfe450canadian View Post
Hey just wondering if anyone could give me some info on getting the motor to top dead Center to adjust the valves. This is my first time checking valves so any info would be greatly appreciated. I got rad and valve covers off now just need to figure out how to properly get TDC?? My bike is a 2004 husaberg 450 fe
Chris
this is what you need mate, I've said it that many times I can['t recall yet nobody ever seems to reppeat it...

TDC is when the leading edge of the flywheel 'bump' goes around and is in a line between;
1) the centre of the crank, and
2) the bottom edge of the screw hole for the cover that is at 9 o clock.

so;
centre of crank
leading edge of bump
bottom edge of screw hole for the cover hole situated at 9 o clock

cheers

Taffy
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August 8th, 2019, 06:51 AM   #5
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Originally Posted by Taffy View Post
Chris
this is what you need mate, I've said it that many times I can['t recall yet nobody ever seems to reppeat it...

TDC is when the leading edge of the flywheel 'bump' goes around and is in a line between;
1) the centre of the crank, and
2) the bottom edge of the screw hole for the cover that is at 9 o clock.

so;
centre of crank
leading edge of bump
bottom edge of screw hole for the cover hole situated at 9 o clock

cheers

Taffy
Ok thank you , when you say screw hole are you talking about the engine locking bolt? Or is that something different? So what i need to do is remove the flywheel cover and align the marks at 9 0 clock then use the engine locking bolt ? Or where is the screw hole on the flywheel cover ? Sorry first time working on a 4 stroke engine
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August 8th, 2019, 07:51 AM   #6
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well the cover is held on by 4 screws and one just happens to be at 9 o clock.

to do the tappets, the engine only needs to have the inlet and exhaust valves closed which happens to be over about 240 crank degrees/120 cam degrees.

so there's no need for a crank locking bolt. I've never used one for anything. I sell plenty though.

YOU (not me) might need a crank locking bolt for cam timing but I'm too long in the tooth to need one.

Taffy
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August 8th, 2019, 07:57 AM   #7
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agreed: for *checking* valves, you don't need to be exactly at TDC. I rarely am, I just make sure I'm well away from the cam lobes pushing on the lifters.

for *adjusting*, it's a different story.
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August 8th, 2019, 08:00 AM   #8
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Originally Posted by Taffy View Post
well the cover is held on by 4 screws and one just happens to be at 9 o clock.

to do the tappets, the engine only needs to have the inlet and exhaust valves closed which happens to be over about 240 crank degrees/120 cam degrees.

so there's no need for a crank locking bolt. I've never used one for anything. I sell plenty though.

YOU (not me) might need a crank locking bolt for cam timing but I'm too long in the tooth to need one.

Taffy
Ok thank you ya I just wanted to check the valves to see if they need adjusted before I ride it just wasn't sure on getting the tdc right so if I align the flywheel at 9 o clock that will be tdc? Is the a mark on the flywheel?
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August 8th, 2019, 09:02 AM   #9
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Give him a picture Taffy so he understands better.

Check the youtube vid otyerwise and check how the flywheel ends up while ur at TDC, might help you understand what Taffy means.
It's not a difficult job to do but I understand you want to know what/how to do it correctly.

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August 8th, 2019, 10:02 AM   #10
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hopefully you can see the attachment.

minnie mouse would also do!

Taffy
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First Valve adjustment best way to get tdc??-tdc-diagram.jpg  
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