no head gasket

the biggest sucess i have had with creating a good powerband is with jetting, but i live at 7000 feet once i figure this out maybe then its time for port mods, any other high altitude dudes out there?

7000 feet? Think really small fuel jet.
Somewhere I read a thread about a guy that stripped an end off of a bread bag twisty tie to expose the thin metal wire. He then removed his fuel jet from the carburetor and filled it up with solder using a butane torch to heat the jet. Before the solder hardened he stuck the wire in the solder, all the way through the jet, and held it there untill it cooled. Pull out the wire and you have a really small fuel jet. If it is too small you can use the wire like a ream and slowly enlarge the hole.

this jetting stuff with the solder and the drilling a smaller hole, does it require a drill press or can it be done with a hand drill?

It is best done with a devise called a pin vice. It is sorta like a teeny hand drill you spin with your finger tips. Like winding up those cheap happy meal toys that hop around the table. I have seen these sold with rediculously small drill bits, all in a kit, at hobby stores.
About $8 to $10.
The bits are sooooo small that a regular chuck on a regular drill could not close up enough to grip the drill bit.

pin vice. cool. i just googled it.

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heh me too. how do you make sure the hole is centered and true?

just an idea that bloomed from how we use jigs for drilling hole patterns at my job....

you could take a block of wood and drill a hole the diameter of the removed jet just deel enough to countersink it, and in the exat center of that hole a pinhole to the other side, where you make a hole countersunk for your pin vice get where im goin?

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When you are drilling out a fuel jet, the hole can be off center a little bit. The gas will not care as it flows through it.

If you remove the base gasket you are lowering your port timing, which will almost always give you more low end, though you can at some point have your port timing to low/early.


On the other hand removing the head gasket does nothing but increase compression.

Use Threebond 1211 sealant to act as a head gasket, in either case. You also need to check your squish clearence before removing either base or head gasket. you should be running a minimum clearance of 0.7mm squish

it is important to have some room for heat expansion of the piston... very important point.

however, on the other hand. the squish is almost non-existent on these heads lol

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