Return to puch 70cc hi compression head - old style fins
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4 of 5 Not for Athena AJH or treats reed Friday, August 28, 2026
taco eater : @moped_army not the forum from San Jacinto, CA United States  
This head isn’t even close to the contour of the ajh or treats single ring reed piston. Learn from my mistakes. They never said it was, but I read on a forum post somewhere or maybe someone else’s taco rating it works well. It does indeed not work well. The squish sucks on those kits so I decked this head down flush to the flat before the dome and decked my cylinder down. Because the contour (narrow dome) is so far off, the squish is very tight on the taper to the crown of the piston but not on the edges of the piston. Use a different head :)

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5 of 5 EXACTLY what my Chappy LB50 Polini 70cc needed! Wednesday, March 8, 2023
taco eater : John Stevens from Worcester, MA United States  
Low end was PAINFULLY bad with the puch 70cc LOW compression head. Noticeable power gain in the low end range, and can still run pump gas!!!! I've been running 89 octane no pinging at all!!! 87 might work too but idk you tell me. Paired with the MLM peoples pipe and Polini 70cc kit she FLYS, 40mph flatground EASY with the 25T rear sprocket!!! Though i typically keep it around 30mph dont wanna turn too many RPMs for too long ya know

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3 of 5 Compatibility issues with qt50 Thursday, November 10, 2022
taco eater : Adam Rogers from versailles, KY United States  
The listing says it will fit a QT50 but inspecting the head there are obvious incompatibility issues easily taken care of but it looks like to fit it to a QT I would have to cut the foot rests. I have a 70cc high comp head and it does not just fit like a glove at least, not until you rig them both into position at the same time. not plug and play by any means. Will this head clear the foot rest on a 1980 QT50, and the gasket is obviously non Yamaha issued. where do I find a correct gasket?

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5 of 5 Perfect for 45mm Airsal "Old Fin Style" Cylinder Tuesday, January 18, 2022
taco eater : Adam Riggsby - Pike Cycles from Allston, MA United States  
This head seems to be the perfect match for the 45mm Airsal "Old Fin Style" Puch Cylinder. From the fins, to the extrusion for the decomp spot, it looks pretty spot on. It should work with the "partially domed" piston as well.

And as said before, combustion chamber looks large and actually really good for higher RPM applications.

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4 of 5 ugly bastard Wednesday, July 19, 2017
taco eater : Birdman from Michigan  
When base-gasketed properly with no head gasket, the head has a beautiful 1.143mm squish against the 'Treatland Kit for the People v1' piston. Base I used is a .2794mm Karropak gasket. (The piston is above the exhaust port floor at BDC, however, it makes more power and is quieter setup this way than with a thick base gasket.)

Previously, I stated this is a low compression head due to the exaggerated dome. I was incorrect. It does the trick.

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4 of 5 Kstar Low Compression head Tuesday, March 17, 2015
taco eater : Maci Dub from Dubvue, WA United States  
Marked K-star.  This is actually a low-compression head with a very large and deep combustion chamber and narrower squish band compared to the others.  

Casting has some flaws visible around the plug hole from where the aluminium flowed together.  End of threads machined a little rough, had a thin sharp edge on the combustion chamber side that I filed out.

1.0mm edge clearance, check your squish and adjust with the right thickness base and head gaskets.

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5 of 5 Not all that bad... Sunday, May 20, 2012
taco eater : Brad Rice from Albany, NY United States  
Very few moped parts are made with great engineering precision. That said, I thought the casting on this head was fine, it sealed up fine, and was cheap....CHEAP!

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3 of 5 it's not you, it's me... Saturday, March 24, 2012
taco eater : Dick Gazinia from Hollywood  
Take a good look at the machined surface inside the squish band.  It kind of looks like termites got in there.  A little porous on the casting.  But it's $30.  I love you.

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