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
First Valve adjustment best way to get tdc??
- Thread starter Chrisfe450canadian
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- 450fe adjustment tdc valve
Joined Nov 2001
17K Posts | 773+
Ely, England
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
Joined Nov 2001
17K Posts | 773+
Ely, England
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
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?
Joined Jan 2019
64 Posts | 12+
Sweden
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. [emoji1303]
It's not a difficult job to do but I understand you want to know what/how to do it correctly.
Skickat från min SM-G950F via Tapatalk
Check the youtube vid otyerwise and check how the flywheel ends up while ur at TDC, might help you understand what Taffy means. [emoji1303]
It's not a difficult job to do but I understand you want to know what/how to do it correctly.
Skickat från min SM-G950F via Tapatalk
Thanks taffy do you know if the little silver bushing type thing under the arm is that supost to have play in it ? I attached a photo of what I’m talking about I notice the one has quite abit of play it spins and moves a little up and down is that normal ? It seems to move a little more then others
Attachments
The mini mouse one showed up thank you. If I take my cover off and get it to where I think tdc is and take a pic of flywheel position would you be able to tell if I’m in the right position or not?
Ah ok thanks good to know, if I take a pic of my flywheel lined up could you tell me if I'm in the right spot? So all I need for tdc is to align the leading edge bump on the flywheel at the 9 0clock bolt on the compression stroke and that will be tdc and that's where I adjust my valves ? And is there a special feeler gauge ment for it or do I do the 1/6 turn method or is it 1/8 turn method lol and is that accurate? Says my valves are supost to be 012mm and I see other ppl setting them at 010mm ? Is that just so they stay within spec of 012mm as they wear out becsuse the valves gap get bigger as they wear?
okay awesome thanks for your help! 1 last thing before I try and adjust them can I use the 1/6 turn method and be all good ? And when at tdc the rocker arms will have play in them right ? I did the intake exsaust compression stroke and looked and the flywheel line was lined up perfect at 9 o’clock
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Joined Nov 2001
17K Posts | 773+
Ely, England
you have to have the valve inspection covers off. then look at the inlet valves. as you turn the engine over with the plug out, the bump will be at about 5-6 o clock when the inlets will have been coming up (so they will be closing) and will be closed and stopped at that 5-6 o clock OK? you continue with the flywheel bump taing it around to 9 o clock.
there are two TDCs, you want the one when the inlets have just closed and not the other one when the exhausts are coming up and the inlets are going down...that is the crossover TDC....you don't want that!
Taffy
there are two TDCs, you want the one when the inlets have just closed and not the other one when the exhausts are coming up and the inlets are going down...that is the crossover TDC....you don't want that!
Taffy
ok yes I got the inspection cover off and rad and everything spark plug out . Okay so when I’m at true tdc when I move the flywheel bump from 6 o’clock to 9 o’clock the valves shouldn’t move at all and they should be both up (closed) am I thinking right? Lol. And about the 1/6turn method dose that work and good for adjusting them?. Thanks you have been very helpful I just wanna make sure I’m at the proper tdc
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