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April 22nd, 2018, 08:23 AM   #1
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Top End Rebuild

top end rebuild

hi can anyone tell me how to find tdc on the piston stroke.
i have had to remove the head out of tdc i can align valve lobes timing chain etc as there are the two marks to follow. but does it matter which stroke the piston is on when putting back together again?!
As there are two tdc on a four stroke am I making myself clear if not please do mention!

any help would be appreciated

Husaberg fe 450 2008

Last edited by Dan76; April 23rd, 2018 at 12:37 AM.
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April 22nd, 2018, 10:52 PM   #2
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Not to be an ass, but if you don't know how to find TDC for the piston? You might consider getting help from a mechanic with knowledge of Husaberg engines? When Husaberg designed there engine it was designed for the common guy to work on in there garage. There motto was when I started working at a dealer was "if it doesn't need it we don't put it in the motorcycle"
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April 23rd, 2018, 12:35 AM   #3
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Well you sound like an ass to me. Maybe you should take a moment to think about your reply.
I’m not a mechanic, but figured if I can remove the gearing on a Royal Enfield that’s lost 2nd and 4th put it all back in fixed. Remove my mates head and block clean all the araldite that it was glued together with re tap striped head bolts, in the middle of the Himalayas with not much more than a leatherman. Then I could find my way round a husaberg in a warm shed decent tools with some advice from like minded helpful people off a husaberg forum like this one?
Or maybe I have come to the wrong place?
Thanks from Rainerio and astromarn
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April 23rd, 2018, 04:16 AM   #4
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It's a both way ...I want to say for myself it can be hard somentime to give suggestion as you don't know the other person background or experience...

I am in work now it will post an easy answer...TDC is at compression stroke there is only one TDC TDC marks are at the rotor on the elettric side (right side engine case)

Print the manual https://www.manualslib.com/products/...6-4083877.html

There are quite a few video online searching ktm rfs engine rebuild to give you some advice (rfs and husaberg are quite similar)
Thanks from Dan76

Last edited by paolo6; April 23rd, 2018 at 04:17 AM. Reason: Bbb
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April 23rd, 2018, 04:57 AM   #5
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I don’t really know any of the terminology as I have just found my own way round an engine. I get what you mean about only one tdc I don’t know what you call it when the piston is at the top on the next cycle and don’t want to get confused with putting it back together on that one or does it even matter?! When I was down at the track on Saturday they seem to think it didn’t matter, I did and thought they were just getting a bit enthusiastic about me getting back out.
Had a look on you tube but struggled to find anything 2008 or before. Much appreciated for the link on the manuals have been looking for something like that for ages. Not had a proper look through but looks a lot more in depth than the service manual I have as it’s just put oil here and fuel in there as it were.
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April 23rd, 2018, 05:34 AM   #6
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Dan, just make sure the piston is all the way up, at the top of the cylinder. Turn the engine over by hand--clock wise on the right side of the engine--. Take a straw or something similar and poke it down the spark plug hole a couple inches. Turn the engine over slowly. You will feel the piston touch the straw and begin to push it back out of the hole. When it stops pushing, you are at Top Dead Center, or TDC. You should be close to the TDC timing marks on the flywheel (or rotor) and engine case--line them up. Now, line up the timing marks of the camshaft, with the lobes either pointing directly up or down. I think I've read that Husaberg states they should be up but I've always set them up pointing down on other four-stroke singles I've built over the years.
It may take a few tries to get it right as it may look right when you put the cam chain on but then you install the tensioner and it's suddenly retarded a tooth or two.

Hope this helps some.

Bruce
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April 23rd, 2018, 05:50 AM   #7
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Ok thanks for the reply, though I thought the lobes want to be down so that the valves are shut can anyone confirm?

Just mention the head is off so piston is visible.
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April 23rd, 2018, 06:25 AM   #8
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Down is fine. That's how I prefer to time it.
When the lobes are down, you are at the top of the compression stroke, when they are up, you are at the end of the exhaust stroke. Either way, the piston is at TDC.
Don't overthink this. All you are doing is phasing in the camshaft position relative to the crankshaft position. Up or down will work. Trust me.
Thanks from Dan76

Last edited by brucifer; April 23rd, 2018 at 06:29 AM.
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April 23rd, 2018, 07:37 AM   #9
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Don't overthink this. All you are doing is phasing in the camshaft position relative to the crankshaft position. Up or down will work.
...and when you align the dots, you are just syncing the counterbalancer to the crank.
Thanks from Dan76
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May 6th, 2018, 01:26 AM   #10
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Thanks for the help! flat battery but after a charge fired straight up and running well!
Thanks from tourist and paolo6
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