Difference between slant angle head and normal

GoldenMotor.com

Mozenrath

New Member
Jan 13, 2011
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California
Yes, the slant head is mostly for clearance. People say that it creates more compression, but I'm not sure how true that really is. Not saying it's not true, but if I were to look into increasing power, I'd look more towards expansion chambers, thinner head gaskets, and head milling/sanding. Those are things proven to work.

On my frame, the engine fit fine but from where I put the CDI the plug wire couldn't reach the spark plug and probably would at least have a difficult time doing so with a straight head. All I had to do was rotate the head and that problem was solved.

Rotating the slant head makes no noticeable difference in performance. Ideally, you'd want the plug pointing towards the intake so that the explosion pushes the exhaust towards the exhaust port, but on these small engines this doesn't make any difference. I had the head both ways and it ran exactly the same.
 

brett7777

New Member
Aug 19, 2011
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Auckland, New Zealand
I need more clearance in my frame & I have a straight head motor. I've been told that if I change my straight head for a slant head, that the piston may not have clearance & may hit the slant head. Does anyone have experience with this? I really need the extra clearance.
 

Greg58

Well-Known Member
May 1, 2011
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Newnan,Georgia
The piston does not rise out of the cylinder so it can not hit the head, the only thing that might hit would be a spark plug with the extended tip. I would bolt the head on without a plug and see if it clears by rolling the bike, on most engines the heads are interchangable.