Adjusting valves on Scrambler 500

[p5200]

Does the pull rope have to be on the machine to get top dead TDC? The rope was gone on this one when I got it. Or, can a plastic tool be used in spark plug hole to feel for TDC on compression stroke? Thanks for all info! 🙂

[Mech]

If you can take the pull start cover off you will be able to turn the crank by hand or a socket, or, put it in a forward gear and gently nudge the bike forwards so it turns the engine over. If the timing mark goes right past the hole then you'll have to nudge it right round two whole turns of the crank so watch carefully and nudge it gently. If you have the spark-plug out it will turn easily, and if you have the cam cover off(if it has one) you will see when it's getting near the right place before the mark gets into the timing hole.

[p5200]

I think, if I'm going to take that cover off I'll order a new pull rope assembly and put it in while it's off. I'll save that info for when the new rope gets here. First unfortunately, I think I need to pull my carburetor. I'll start a new thread on that. Thanks Mech 🙂

[Mech]

Thanks P5..

[Gwbarm]

I use a screwdriver in the hole and turn slowly to tell when im at top dead center with a finger over the hole to tell when im on the compression stroke, but timing marks are good too if you can see them while turning over the engine.

[p5200]

I've read that somewhere before but haven't actually tried it yet. It sounds like the valves may be making a clattering noise. It mostly makes that noise with misfires and engine surging up and down. Thanks GW! 👍