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Welcome to the board.  Have you adjusted your valves?  If you have fuel and spark, the only thing left is compression, which could be from a sticking or otherwise "off" valve.

 

Another possibility would be a sheared flywheel key that would make your T mark not be in the right place relative to the crank.

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Welcome. Are you saying your T mark is at the bottom of the hole when the piston is at TDC?

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Posted (edited)

Hi: Big welcome here -- this may help with a couple of picture of a 420 --- line with notch

T Mark (1).jpg

T Mark (2).jpg

Edited by Melatv
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Is the notch on threads right hand side?

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Posted (edited)

Did you look on the threads?

 

 

 

 

Edited by Melatv

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The notch should be right on the threads right side 

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What are you using to try to line up the mark to verify TDC? Piston at TDC or timing marks on the cam?

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I brought the piston to the top and the pushrods are lined up with one another and also in the roundabout area of the T and F Mark correct? I'm going back together with it right now after a top-end rebuild

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the line UNDER the T mark, should line up with the line in the threads that run from outside to inside on the inspection hole, its made into the threads.

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1 hour ago, Rancher-mudd-junkie said:

Screenshot_2020-03-04-14-17-36.png

impossible !!!, the line is either on right hand side, or left hand side of the threads. no way in the world is the notch at 7 o'clock like your saying.

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20 minutes ago, Rancher-mudd-junkie said:

I brought the piston to the top and the pushrods are lined up with one another and also in the roundabout area of the T and F Mark correct? I'm going back together with it right now after a top-end rebuild

 

So when the __ mark is in the middle of the hole the piston is no longer at TDC?

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12 minutes ago, shadetree said:

impossible !!!, the line is either on right hand side, or left hand side of the threads. no way in the world is the notch at 7 o'clock like your saying.

I would have thought that it is impossible myself but the pictures do not lie and I know I'm not the smartest crayon in the Box But there again it is not where it's supposed to be LOL

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Looks to me from the pic they machined the groove in the wrong spot in the threads. From the pic it is 100% in the 7 o'clock position? Thats not the right place for sure. It should be 9 o'clock or 3 o'clock.

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2 minutes ago, toodeep said:

 

So when the __ mark is in the middle of the hole the piston is no longer at TDC?

Yes it is still at TDC but could it be a notch or two off if it is not exactly TDC 

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1 minute ago, SlammedRanger said:

Looks to me from the pic they machined the groove in the wrong spot in the threads. From the pic it is 100% in the 7 o'clock position? Thats not the right place for sure. It should be 9 o'clock or 3 o'clock.

 that's what I'm saying it is definitely not where it's supposed to be I was just confused and wondering if maybe someone has ever seen or ran into  this rare phenomenon before LOL

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