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67lotus49
PostPosted: Wed Dec 21, 2011 11:00 am 
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Joined: Thu Jun 23, 2011 2:26 pm
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Location: Running Springs Ca
On the 74-75 H2 cases is the oil passage drilled to the cylinder base port? I know the late cylinders don't have the oil passage drilled but is there a mark on the casting where is would be. I ask because the 72 I bought has 75 cases and until I take it apart I don't dare to run it without premix in case there is no oil going to the pistons. If I pull a carb/intake should I see a oil port if I have early cylinders? Bike has early carbs and oil lines still. I am going to switch out to 72 cases as soon as I can locate a correct set.
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joker
PostPosted: Wed Dec 21, 2011 11:44 am 
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Joined: Thu Jun 09, 2011 6:53 am
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Location: Rochester,NY
The later cases can be drilled out to fit early cylinders. I had Brian H. drill mine and rubber mount them also. I'd run premix until you pull a cylinder.
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67lotus49
PostPosted: Wed Dec 21, 2011 11:46 am 
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Location: Running Springs Ca
That's what I was thinking too.
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67lotus49
PostPosted: Thu Dec 22, 2011 10:53 am 
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Location: Running Springs Ca
Pulled the carbs and looks like I still have early cylinders with the oil port in the intake track. Moved the oil pump cam to max at idle and it seems I am getting oil to the cylinders. Still will pull a cylinder to make sure someone has drilled the case oil passage.
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H2dude
PostPosted: Thu Dec 22, 2011 4:38 pm 
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Location: Tweed. ont. Canada
74/75 cylinders also had the oil feed hole in them
If you have the later ones you'll have to do the mod to the oil feed hole
http://3cyl.com/mraxl/partid/cylinders/cyldif.htm
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67lotus49
PostPosted: Thu Dec 22, 2011 6:06 pm 
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Location: Running Springs Ca
I'm confused now, I did read the cylinder mod page. Where they just not drilled all the way through. I'm pulling it all apart anyway to replace the case to the correct early 72 ones.
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porschedave
PostPosted: Thu Dec 22, 2011 6:44 pm 
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Yes Ron you got an h2 I see
Congrats

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Ja-Moo
PostPosted: Thu Dec 22, 2011 6:48 pm 
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Location: Rio Rancho, New Mexico
67lotus49 wrote:
I'm confused now, I did read the cylinder mod page. Where they just not drilled all the way through. I'm pulling it all apart anyway to replace the case to the correct early 72 ones.


The 74-75 H2 cylinders had the holes in them, just not the restrictors.

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Brian H.
PostPosted: Sat Dec 24, 2011 7:11 pm 
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Joined: Thu Jun 09, 2011 7:45 pm
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Location: cowasockieville illinois
67lotus49 wrote:
I'm confused now, I did read the cylinder mod page. Where they just not drilled all the way through. I'm pulling it all apart anyway to replace the case to the correct early 72 ones.


They do have a hole drilled in them already. But don't have the brass jet. You just don't want to drill all the way thru when you drill it out for installation of the #30 jet. This way, the jet is trapped and can't come out.
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Ja-Moo
PostPosted: Sat Dec 24, 2011 7:18 pm 
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Brian H. wrote:
67lotus49 wrote:
I'm confused now, I did read the cylinder mod page. Where they just not drilled all the way through. I'm pulling it all apart anyway to replace the case to the correct early 72 ones.


They do have a hole drilled in them already. But don't have the brass jet. You just don't want to drill all the way thru when you drill it out for installation of the #30 jet. This way, the jet is trapped and can't come out.


Or you can go the easy route, and install a al or Brass rod and drill a #76 drill hole.

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