I know that too much squish will reqire race gas due to poor chamber design, While I was at it I noticed that the squish was around 2.2 mm. looking at the size of the notch forming I decided it was about.005 off On the ktm the head pilots onto the cylinder via a counter bore to center it, the fit was good, so obviously when the head was machined the chamber was slightly off. the intake side of the piston was hitting it. I removed the head to look at some burn patterns and stuff and noticed that the intake side of the head was forming a burr and a small notch. using a thicker gasket would have put me out of spec, i was either out of spec or plus.004 when setting up the top end. Here is where I am at right now, I had a problem with when I set my "x" dimension at +.004 (spec is. i recon squish is much more important on a 125 than a open class bike.īruce, my inbox is full? I went and checked and it is empty and I am using 0%.maybe it is/was a program glitch that day.
How is the jetting on that bike? if you run plenty of oil and a good race gas, you can really dial them on the money, even with 2.0mm (not that bad on a real big bike)- try james deans program for jetting, its awesome. when it comes back, then adjust for those specs- from what i see, port timing is the most important thing- once you get that set by eric decking the cylinder, then just take down the head in small increments, you might even want to measure the head volume- i think its real difficult to get the squish bang on when you only have a head and cylinder in your hands, so you have to build it then adjust. when you talk with him, ask him for the target head specs and write them down. Ironically, the rm144 came to tight at around 0.5mm and it would deto plugs loose! ive had major headaches with all of this, my advice, be patient and just send the whole lot to eric. i went to 1.0mm for race gas but it ran a bit flat, it must have had too much comp, i had to run a thicker base gasket- it messed me up and i had to get some thicker base gaskets to get it back to 1.3mm. My yz250 had 1.8mm after porting, setup for pump.
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