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5 of 5 Slip it on ya QT50. Friday, October 10, 2014
taco eater : George Sass from Somerville, MA United States  
Definitely gives your engine a muffin-top, but fins clear the frame and footpeg cage with no grinding required.  Slap on the right B*HS plug and take off...slightly faster.

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5 of 5 Vroom Vroom. Friday, April 4, 2014
taco eater : Samuel Schiff from Oneonta, NY United States  
I had a newport with stripped plug threads, so I bought this on a whim.  With a 12 mm carb and 54 jet, the thing screams!  Can't complain.  And its a lot shinier than the old one...

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5 of 5 sweeet Monday, September 9, 2013
taco eater : Mike A from Fort Collins, CO United States  
i already had a hi hi comp head on my bike. i ordered this as a replacement because my spark plug threads were starting to get beat up.

when i took the old head off, and compared them side by side, they were almost identical. same fins, same color, etc. but the combustion chambers were ever so slightly different. this ones was slightly smaller.

i slapped it on my motor with a new head gasket and could feel a definite performance increase in my entire power band. even got about 1mph more on the top end.

temps stayed right around where they were with my old head (275-325).

very happy!

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2 of 5 Hi Torque Clone with High Temps Saturday, May 18, 2013
taco eater : bababooey from pa  
This is a clone of the "Hi Torque" series stock head.  My ZA50 had the same exact head on it.  I put this on an E50 that was already a 2HP model and didn't notice an extreme difference on takeoff (which is what I was hoping for) but there is more mid-range.  As stated in the product description, it is subtle but it is there.

The worst part was the having some idle and take off issues after the bike was warmed up.  After much fooling around I noticed the bike was getting extremely hot.  So hot that it was overheating the condenser and cutting the spark at take off.  I put the original head back on and everything is okay again.

If you want to play around with timing or mounting an external condenser it might be worth it to you.  Otherwise, I'm happy with my stock head.


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5 of 5 Super Duper on an A55 Thursday, May 2, 2013
taco eater : Matthew Stoddard from ATL  
After gearing out to 27x22 I had been looking for ways to get my torque back and this was PERFECT! I haven't dialed in squish via head gaskets yet, but even still I'm hitting the same top speeds as before and getting there in like 2/3 the time. or 1/2 the time? I dunno man, it's fast now.

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5 of 5 SICK SICK SICK Sunday, July 8, 2012
taco eater : Giffin Clark from Highland Park, IL United States  
slapped on with 50cc kstar to a ZA50 w/ 16.1mm borred intake/ 15mm bing/ techno circuit 47mph top speed, lost lil low end but great addition for price pulls the whole package together!!! A+

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4 of 5 good but... Tuesday, June 7, 2011
taco eater : Ryan Nash from Columbia, MO United States  
it's good and all, noticable power increase on a 65 metra... however on my setup I have my timing right around 1.8mm BTDC (powerdynamo) and this head was causing my temps to be out of control (410+!!!)... swapped it out to a stock head with a little less compression and my temps are reasonable now.

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5 of 5 Not for use as intended only Tuesday, May 31, 2011
taco eater : Max Johnson from New Bedford, Massachusetts  
Put this head on a 'Happytime' chinese bicycle motor as an upgrade from the Joke stock head.  Fit like a glove, perfect alignment, surface is nearly perfectly flat, and casting was flawless.  

Excellent cooling compared to stock, combustion chamber and squish band a massive improvment over the cheap hemi head that comes with these motors, spark plug was 100% compatable.  Really tops off a nice port and polish job on these little guys.

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5 of 5 new over stock Tuesday, May 24, 2011
taco eater : flyguy from kannapolis, north carolina  
nice fit, looks good. came as a k-star. before and after. now i know i need rings now!!! with the stock head a #1 head. i was getting about 50psi with the head and gasket. without the gasket 55psi. now with the hi hi head i get 65psi. yea, i need rings badly. not sure of the compression ratio. my best guess would be around 12:1 over the stock 8 to 9:1

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5 of 5 get some low end back from the boss Monday, September 20, 2010
taco eater : Anonymous Person from Rutland, MA United States  
stock e50, 15mm bing, boss pipe. the low end was gone at first. sad days of pedalling to get up to speed. then the 50cc hihi head came into my life. bolted up, lost a mph or 2 on the top end, but no more pedalling. it was a worthwhile tradeoff in my opinion.

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