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Hey guys, has anyone ever bored a 140mm Magnum to 144 or 148?? I know that the major 140-148 are built from 144 Yamaha parts and also all of these runs the same vein section. Thank you for any coment. Gera Sent from my iPhone using Tapatalk

How does it compare to yours? Sent from my iPhone using Tapatalk

Thanks a lot. You are right. Those 38's with internal adjusters are hard to reach. I will try a long thin screwdriver. Thanks Quinc. Sent from my iPhone using Tapatalk

Sure... Using a brand new gauge. Sent from my iPhone using Tapatalk

Quinc, this is pretty close of what I have but the low adjuster. I have it at 1 1/4. I doubt it can make a so big diference. Maybe there's something else wrong. Thanks Sent from my iPhone using Tapatalk

So, thats why I increased popoff a little bit after install stock F/A and noticed a slightly poorer performance. If Im lean it would be worse without F/A. Am I wrong?? So, next attempt is to lower popoff a little bit and increase pilot jet. Thank you guys. Sent from my iPhone using Tapatalk

That makes sence. I tried ski without F/A when first water test and it was better than now... For this reason I thought that Im a little rich after stock F/A on. Less air = richer. Yes or no?? Sent from my iPhone using Tapatalk

Have no doubt but there's a similar ski that I copied stock jettings from and it is running something like this... Maybe lower popoff. Sent from my iPhone using Tapatalk

Guys, Ive been on this thread since long time ago and always got awesome infos but now Im stucked in a so simple tune issue. I own a 2012 SJ that had B pipe, ADA, MSD E, V force... I was running 38's with aprox 95 pilot, 50 psi, 145 main,... I just got it back to stock and I never got it...

No doubt. I imagine how lower the pro pitch is in that. Sent from my iPhone using Tapatalk

Yeah... Should be something like this. Sent from my iPhone using Tapatalk

[emoji15][emoji15][emoji15] Sent from my iPhone using Tapatalk

Ive never seen it. Sent from my iPhone using Tapatalk

Mat need a couple. Sent from my iPhone using Tapatalk

You are right as it is hitting not on the borders... Maybe an excessive deck service or thinner gasket. Sent from my iPhone using Tapatalk

So you agree to run 760 domes?? Sent from my iPhone using Tapatalk

Thanks BK. Cylinder perform good and I realized the issue when disassemble to inspect it. It was running strong. Maybe another gasket will do the job or a dome machine service to get correct squish. Compression was crazy... 225psi w/33cc domes. Btw, we rode it for a couple of years like this...

I have 33cc (701) and 35cc (760). Due to the problem (no squish), I was getting 225psi w/33cc(701)... Looking for 185/195. Sent from my iPhone using Tapatalk

Guys, I have a TLR 701 light ported that I disassemble to rebuild and realized that the piston was touching the domes a little bit. Pistons are 83mm and domes are 701. Squish wasn't right, obviuosly. I was going to machine domes but I have some 760 domes. Question is if when running 83's on...

You made that spacer?? Sent from my iPad using Tapatalk