Look at these two heads

[Whitewill1412]

One is from a Runwell (aka Wildcat) PK80 and the other is from a $95 ebay kit. Can you tell which is which? It's becoming more clear to me that spending a little more on a good kit is so worth it.

 

[Whitewill1412]

No comments? First thing look at the size of the stud holes.

 

[DieselTech]

1 head is a bigger head for cooling. Way better thought out cylinder head.

 

[Whitewill1412]

You see how big the holes are on the cheap one? It doesn't line up right. You can tell the cylinder was off center

 

[DieselTech]

You see how big the holes are on the cheap one? It doesn't line up right. You can tell the cylinder was off center

Junk it!

 

[Whitewill1412]

Junk it!

Yep. It's already been replaced

 

[Chainlube]

I had nothing to say, didn't like either of them. The right one has an off angle squish, and the left has none.

 

[Whitewill1412]

I had nothing to say, didn't like either of them. The right one has an off angle squish, and the left has none.

I also noticed that the PK80 head has no squish band. That engine ran great with that head though. Maybe even better than the aftermarket head that I replaced it with. I didn't really test them head to head. Makes me wonder how important the squish actually is. Why would it run strong with no squish band?

 

[Chainlube]

I also noticed that the PK80 head has no squish band. That engine ran great with that head though. Maybe even better than the aftermarket head that I replaced it with. I didn't really test them head to head. Makes me wonder how important the squish actually is. Why would it run strong with no squish band?

I put a 48cc on the Auto-Mini, it had a head exactly like that. It was a fun little bike, pretty quick for a 50.

 

[GW's Motorized]

I think somebody who actually knows how to make power out of a head should start making a head for these that has a good squish band, a small combustion chamber, and large cooling fins.