Honda Spree and Elite 50 Forums

How much should this cost to have done? One place told me $70! What a joke. How should I go about finding a place?

idk but $70 is way to much to mill a head down. I dont think it would be more than $20

what head is it? whats it go to? i could do it if its a spree or elite se50 head.

chevyguyjay wrote:what head is it? whats it go to? i could do it if its a spree or elite se50 head.

NH80, how would you do it? What kind of machinery do you have?

im not sure what the NH80 head looks like. on the spree head, i have a piece of steel about 4x4 and 3/4" thick. i drilled and tapped a hole in the center. i take the head and screw it down to the 4x4 steel plate with the fins of the head facing up. i put it on a magnetic surface grinder at work and mill the top of the head first. after i c that i milled all the fins, i flip it upside down and repeat the process. works great! i milled 5, and ended up selling 3 of them.

chevyguyjay wrote:im not sure what the NH80 head looks like. on the spree head, i have a piece of steel about 4x4 and 3/4" thick. i drilled and tapped a hole in the center. i take the head and screw it down to the 4x4 steel plate with the fins of the head facing up. i put it on a magnetic surface grinder at work and mill the top of the head first. after i c that i milled all the fins, i flip it upside down and repeat the process. works great! i milled 5, and ended up selling 3 of them.

Do you mill the fins just so that you get a flat surface on the top?

u got it.

y would you mill the fins? That would make it run hotter on top of the increased heat after bumping up the compression

well, take a stock spree head and lay it on a level surface with the fins down. if u notice, it has a wobble to it. i only mill just enough so i get all the fins. now that i know i got every fin, then i flip head upside down and mill the head.

Milling enough off the top to machine the bottom won't hurt anything; it's just using the equipment you have available. When I looked at milling the head I had the same problem.

We decided to use a lathe instead, using a similar jig to hold the head by the spark plug. This appears to be how they are done in production.

oh now i get it your just removing casting defects not the entire fin

:wink:

first thing i do is clean/ degrease the heads, then paint them with with a nice hard enamel finish. i machine these heads on a surface grinder. i start with the fin side up so i get that side level. then i flip it upside down and mill the head. pretty good results.

Nice pics, they finish off how you do the work. Great looking heads
Are you thinking about naming a price for another run of heads?
Do you think your jig can handle Gyro heads?

Noiseguy - thanks too - the lathe jig info is good. I didn't know how folks are doing the mods and dont have the equipment but its great to find out how its properly done.

thanks!

yea, the gyro head is going to be a little tricky. with those 2 studs, i might have to remove them and replace them with screws instead. i and going to do it though.......cant really think of any performance things to do to a gyro.