possibly good head...

Moto · Mar 21, 2013

Im sick of boring out these puch heads from 45 to 47mm. Ive been shopping for a 47mm head and found these: http://www.ebay.com/itm/cylinder-HE...Parts_Accessories&hash=item4d0acbd660&vxp=mtr

Im not sure what the spacing for the 66cc. HT motors is but if its the same then im gonna go for it.
.shft.

Goat Herder · Mar 21, 2013

Hey that is a pretty Kewl looking cylinder head.

Frogster · Mar 29, 2013

It doesnt look like you will get the advantage of double the cooling area that you get with the puch head.

MotorBicycleRacing · Mar 29, 2013

Moto said:
Im sick of boring out these puch heads from 45 to 47mm. Ive been shopping for a 47mm head and found these: http://www.ebay.com/itm/cylinder-HE...Parts_Accessories&hash=item4d0acbd660&vxp=mtr

Im not sure what the spacing for the 66cc. HT motors is but if its the same then im gonna go for it.

That head is 50 mm center to center on the studs
where as the 66 cc motor is 45 mm

Goat Herder · Mar 29, 2013

Yeah it will not fit. try getting any one of these.

http://www.piratecycles1.com/picyhicohe.html

The Puch High head.

Prolly want the 70cc one.
https://www.treatland.tv/puch-moped-70cc-hi-compression-head-p/puch-hi-comp-head-70cc-maxi.htm

http://www.ebay.com/sch/sis.html;js...66 80 cc head and intake&_itemId=130769122453

Moto · Mar 29, 2013

I measured and got that the head was over 60mm....??? Lots of good aftermarket heads out there im just searching for cheap ones...

I guess it back to boring out puch heads :0 lol

Goat Herder · Mar 29, 2013

The Puch High head at 30 dollars is about as cheap as it gets IMHO. I would be very surprised if you found something cheaper?

MotorBicycleRacing · Mar 29, 2013

Moto said:
I measured and got that the head was over 60mm.

You measured what dimension?

Straight across center to center on the studs is 45 mm

Goat Herder · Mar 29, 2013

Check out these picts of the Puch Head. Bang for the buck.... it crosses right over to the H.T. engine and offers good cooling capacity. https://www.google.com/search?q=puc...s=org.mozilla:en-US:official&client=firefox-a

maniac57 · Mar 29, 2013

Goat Herder said:
Check out these picts of the Puch Head. Bang for the buck.... it crosses right over to the H.T. engine and offers good cooling capacity. https://www.google.com/search?q=puc...s=org.mozilla:en-US:official&client=firefox-a

This is the version that bolts on once you open up the stud holes, right?
(If you have the 8mm stud engine)
I don't like the idea of running two head gaskets either...
It does fit without hitting the piston?
High compression I can deal with, interference I can't.

Goat Herder · Mar 29, 2013

Folks have run them with just one gasket. It is not at all complected to drill the bolt holes out bigger ether and one can run two gaskets if they prefer? The 70cc one will work........

Here is Max350's

http://youtu.be/l42VDg5LbWI
http://youtu.be/wz0-ek8eInk

maurtis · Mar 29, 2013

I ran the 70cc Puch head on my BGF RB80, 6mm studs so no boring needed. The only issue I had with running one head gasket was the added compression required me to tighten my main clutch spring since it would slip when trying to pedal start.

No interference, no leaking, just more torque and cooling.

Moto · Mar 29, 2013

yeah thats what I have been running:

1 headgasket, combustion chamber modified so piston doesnt hit head. Otherwise its a standard 40mm stroke 47mm bore engine. Ran great until it ate its own cylinder wall and bearing....

Moto · Mar 29, 2013

MotorBicycleRacing said:
You measured what dimension?

Straight across center to center on the studs is 45 mm

really? maybe i did measure wrong. Ill trust you.

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possibly good head...

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