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how to new piston?

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What is the first step in tearing my cylinder off? Do I need to lock TDC before doing this, will a bolt do it or need special pin? How do you go about doing this, do you need to find tdc on compression stroke? I have manual, not very appealing to look at. Never took it apart. Its looking like I will have a lot of time this coming year to do no riding so I like to get a new piston and rings and check valve lash.

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which engine?

I just posted some info you might find useful, for the post about how to put engine at TDC with top end off.

I would put it at TDC, although you can also do it on reassembly. I splurged and bought the crank lock tool, but most guys say you can remove the bolt, then the copper washer, and then re-use the same bolt. The "tool" seemed longer to me, and the top a bit more rounded.

the cams should have lobes facing outward and the hole in the lobe lined up even with the edge of the head. that's your compression stroke.

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not sure without looking it up, but motor is from 2009 450 sxf.

so I should be able to use the bolt in the case or a longer one. I did not know if you needed a special tool. The bolt thats in there now serves what purpose, just a plug?

Timing chain you can slip off somehow without breaking it? I am guessing it does not have a master link.

I have 100 hrs on it, same piston. Need acl surgery this comming year, so I will have several months to fix.

which engine?

I just posted some info you might find useful, for the post about how to put engine at TDC with top end off.

I would put it at TDC, although you can also do it on reassembly. I splurged and bought the crank lock tool, but most guys say you can remove the bolt, then the copper washer, and then re-use the same bolt. The "tool" seemed longer to me, and the top a bit more rounded.

the cams should have lobes facing outward and the hole in the lobe lined up even with the edge of the head. that's your compression stroke.

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on the side of the head, and below that, there are 2 shiny metal covers that stick out like a bump. those are for the timing chain gears, so no, you don't have to break the chain.

the crank lock tool is just a longer bolt with a slightly rounded end on it. yep, the original plug/bolt in that hole is only for keeping it covered until you lock it at tdc. I found it still moved, even when allegedly locked at tdc.

PM me your email address, I can send you some info that might help. I also have the 450 SX-F, but the '07 version (motor is the same, as far as I know).

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