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Old 02-09-2019, 02:55 PM   #31
Mario
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Man.... this shit is nerve wrecking! But getting there, everything fitting with not much hassle (lots of oil helps a lot!).

So the big question I have in my mind: I took this apart at TDC but unknown if it was in compression or exhaust cycle. After taking apart, I did move the piston up and down, so now I do not know if piston at TDC is on either compression or exhaust cycle. I'm assuming the ignition pick up is at the crank (only temp sensor on head). Do I have to check that I am at the right stroke before assembling? This would be the case if ignition and injection is timed once every two revolutions. I didn't see anything in the manual, but probably the manual assumes it never moved from TDC. I'll keep digging, but if anyone has any insight on this, please let me know

EDIT: when i took apart, I lined up the marks and valves were closed, so TDC was compression... me thinks...

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Old 02-09-2019, 03:17 PM   #32
augustiron
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TDC is tdc. Piston and crank don't know the difference. Just put it at tdc and line up the cam marks. Cams dictate intake/compression/exhaust stroke.

Also, there may be a pin or bolt to hold the crank at TDC, I know there is on the rfs.

Last edited by augustiron; 02-09-2019 at 03:21 PM..
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Old 02-09-2019, 03:29 PM   #33
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Quote:
Originally Posted by augustiron View Post
TDC is tdc. Piston and crank don't know the difference. Just put it at tdc and line up the cam marks. Cams dictate intake/compression/exhaust stroke.

Also, there may be a pin or bolt to hold the crank at TDC, I know there is on the rfs.
Piston and crank donít know the difference but ignition needs to know (unless ignition doesnít care either and runs a spark and injection on every revolution).

Iím using the crank locking pin, itís a 8mm screw on the side. I got everything lined up, just need to check that ignition will be ok or not
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Old 02-09-2019, 04:11 PM   #34
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Quote:
Originally Posted by Mario View Post
Piston and crank don’t know the difference but ignition needs to know (unless ignition doesn’t care either and runs a spark and injection on every revolution).

I’m using the crank locking pin, it’s a 8mm screw on the side. I got everything lined up, just need to check that ignition will be ok or not
Augustiron is correct.

Some fourstroke bikes have a trigger like some XR's that only spark on the power stroke, many more have whats called wasted spark ie spark both power and exhaust stroke.

Its been a few months since I helped cyclenomad rebuild his 350, but I dont remember there being a trigger (and in trigger motors it is triggered off the cam position not the cranks.)

We followed the factory manual's instructions and locked the crank in with the screw as you have (there is no compression or exhaust stroke as far as the crank is concerned.) Then installed the head and lined up the cam per the manuals instructions. Fired right up.
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Old 04-19-2019, 12:49 PM   #35
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Well this took a while.... But I am finally done, bike is rebuilt and pulling hard!!

Many thanks to all that gave me feedback! I am rebuilding another one and it is going much easier, that confidence boost makes a big difference.

Thanks all!





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Old 04-19-2019, 01:23 PM   #36
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Awesome!! Go rip it up!
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Old 04-19-2019, 02:50 PM   #37
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Breaking in the engine... after the first couple of oil changes, she goes wide open throttle
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