Chainsaw Repair

I was looking through the plug hole and even with a dome and offset chamber it still has a squish band around the outer most circumference. I think that if I  check it at the 3 and 9 o clock position will give me the most accurate reading. You just have to make sure that your solder is tight to the cylinder wall. And the dome on the piston does not go to the outer edge in has a flat all the way around. But maybe I am missing it all together.

I wonder if mothers clay bar would work for what you are speaking of, sound kind of messy. Just imagine to much wax or clay with no rings big mess.

how are you going to get an accurate measurment from clay without it deforming? use the proper sized solder and put it at the 12, 3, 6 and 9-oclock possitions to hold the piston even. no point in over thinking this.

I don't know if wax would work or not I just threw that out as a possibility .I use solder myself just like most people do .

In this praticular situation it should seem logical that the very center of the hemi domed piston would in fact appear to be where the measurement should be taken as that in fact is the closest the piston top would be from the head deck .

With that in mind what would happen if you used 5 pieces of soft solder about a 1/4" long .4 placed equadistant from the center of the piston at 12,3,6,and 9 o'clock with one piece dead center ,with a little dab of grease to hold them in place .Measure the center piece .

Know compounding the problem ,does the center of the piston align with an area you could mash the solder because the chamber is offset ? If not that theory goes right out the window .I don't know myself because I have nothing to base it on unless I tear down a saw with an offset chamber to verify that which I'm not going to do at least not right now .

Another thing ,is the head dead flat or does it have some curvature to it? Another answer I simpley do not have .I would assume flat .

Duration is from the time the port opens until the time it closes .Get the exhaust through the exhaust port ,intake through the intake and transfer by peeking through the plug hole.

Then if you want you can figure time open in relation to speed and further figure time area open with a port map  to use some of the formulas .--or you could just wing it . Now a wing works pretty good if you don't go bonkers with it .

What you really should do is Google  three things .McDizzy ,A Bell and  Gorden Jennings ,Between those three they can answer just about any question there is about two cycle performance tuning .

The 11" summit racing wheel at top of this link.   http://www.summitracing.com/search/part-type/degree-wheels     others there to choose from too.


Jegs racing 11" wheel  http://www.jegs.com/p/JEGS-Performance-Products/JEGS-Precision-Cam-Degree-Wheel/937108/10002/-1


Moroso has a 18" for twice the $$    http://www.summitracing.com/parts/mor-62191/overview/