unisonracing
Well-Known Member
COD.:CK.68.743.G1 70cc 12mm for a motor minarelli or Italjet-Aprilla
So I hit up the wholesaler about the 43mm and the 42mm cylinder and I was shipped some other guys stuff and he was shipped mine. He had my invoice and I had no invoice. LOL The new stuff will be here Thursday and is good for 45mm cranks. I talked to the italkit tuner and he said that this will and should beat a fhr type cylinder out of the box and with a little tunning 20hp should be easy.
Here is what he said to do.
1. build the bottonm halfs and make sure the oil holes are bigger?
2. fill the case a little and make all surfaces in side the lowers smooth.
3. He said I will need to trim the lower of the cylinder to clear the 45mm crank journals and again smooth out and trim piston skirt to match
4. Open all ports in cylinder 2mm up toward the top of the head
5. I will need to open up the intake and exhaust port 3.7mm to the top and hone when done
6. take 3mm out of the head to get compression down and make a 2mm washer for the spark plug.
7. use as thin of a gasket as I can for the base of the cylinder less than .40mm and use a copper gasket spray?
8. take 1mm off top of piston can take off up to 2mm but that is max and more and ring will heat and fail.
This set up is good for 45mm - 45.5 cranks and is what they have tested. I was told with no hesation it will walk away form most 46mm strokers but will not make the whole season of 32 races. We will need to rering about 15 races into the year. He also said that vforce reeds are great and that I will need to use a spacer with them to get them to work right.
I asked this guy a lot of questions through my wife. She speaks Spanish like english. lol
So is he just trying to sell me kits or does there tunner know what he is talking about?
I have heard that the simonini kit has a bad finish from factory. Is that true?