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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Compatibility issues with qt50
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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Perfect for 45mm Airsal "Old Fin Style" Cylinder
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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ugly bastard
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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Kstar Low Compression head
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.
EXACTLY what my Chappy LB50 Polini 70cc needed! 
Compatibility issues with qt50 
ugly bastard