thickness of oil affect your 'accelerator pump shot'. those hitachis don't have accelerator pumps, they rely on dashpot oil to provide extra fuel when you slam the gas. thicker oil means the fuel provided when you open up is richer, vice versa for thinner oil. i use that 40 oil because of convenience (my engine use same oil). theoretically any oil can be used. some use auto fluid, some use sewing oil. you have to experiment which is best for your application, considering your weather, engine mods et cetera.

plus by quantity, sewing oil is much more expensive for me. LOL

they do bring differences.

http://planetminis.com/forums/perform ... atio-fully-explained.html

ahh, rod stroke ratio. countless discussion about this on the net.

the most important thing to do, is to open one carb at a time. never open both at the same time, because the carb slide/piston is machined fit with the dome. in other words, the slide is paired with the dome.

most people i know use sewing machine oil for the dashpot. i use engine oil, 40 monograde to be precise, for thicker "accelerator pump shot".

and the float level is crucial. set float level correctly. more than 1mm tolerance, and it's impossible to tune them

i don't think this is a wanted item, the crank doesn't even exist in forums i went on the net.

dieseling?

accelerometer for showing G generated by the car.

how can an old machine overtake impreza (2.0 turbo), porsche and bimmers just like that?

http://www.youtube.com/watch?v=loY46xipnuQ

green hornet 240Z, shaming newer cars effortlessly.

don't use GL5 oil in your box, they will harm the gears. i use Pennzoil 80/90W GL4 in my box and 140W GL5 in diff. no problem at all, smooth shifting.