That isn't even close to "too tight"
Bill M.
What was the geometric compression ratio?
What kind of riding do you do?
Did the piston pins slide out easy or stiff?
I'm not entirely sure what geometric compression ratio is, I haven't heard that term before. I may have
Riding Style: Mostly freeride and boat chasing but the goal is to do more flatwater. I don't believe it could have ingested any significant amount of water since I built it.
I will have to get back to you on the pin, I haven't taken them out yet.
Here are all the details for my setup.
Hull: Carbon XFR with an OEM 155 pump and a Skat Trak E-75 Yamaha 155mm 6/12 Big hub impeller, with a 5mm cutback. Blosion stubby pump cone, 65U 5 deg nozzle (oem bore)
Fuel: 93 octane pump gas
Motor:
701 that was bored to 82mm
Pro X Pistons
ADA Head with 33cc Domes, I was getting about 190psi of compression.
Squish 0.035" - 0.039"
Blowsion Super Base Gasket
The porting was done by me. All I really did was clean up the mismatch between the transfer ports in the sleeve and casting, while doing my best to avoid changing the roof angle of the and making sure not to change any of the port heights in the sleeve. I also epoxied (devcon) and did some medium porting of the intake track in the cases. Here is the link to my build thread where I posted pics of all the porting I did.
http://www.x-h2o.com/index.php?threads/my-first-am-build-rickter-xfr-full-carbon.199245/page-6
Exhaust: Is a Factory B Pipe with a Limited Chamber. Bottom screw is open about 3/4 of a turn and the top is half a turn. Also running a JM waterbox
Intake and Carbs:
OEM manifold
V-Force 2 Reeds
Carbs were dual OEM Mikuni 38's
Rebuilt last winter with all Mikuni parts.
I started out with the same jetting I had been using before rebuilding the top end. 75 Pilot, 140 Main, 1.5 & 65 NS. I was having some midrange bog/hesitation issues.
I assumed I was too lean so I tried swapping over to a 2.0 & 95 NS. Ski still had midrange issues so I went the other way and tried a 1.5 & 80 NS and a 77.5 Pilot. I then found out that while my carbs were synchronized when closed, as they opened they progressively became less synchronized. One was opening more than the other. I fixed that issue and the ski ran a lot better but I was finding I had to have the pilot screw open roughly 2 turns for the ski to idle and have good midrange. I ran about 10 gallons like this. I then swapped back to the 1.5 & 65 NS since that was where she had run the best before the rebuild/porting. At this point I was pretty happy with how the ski was running and I ran maybe 20 gallons through the motor like this. I still had to have my pilot screw at 1.5 turns and I wanted to get this lower so I swapped in 85 pilot jets. It was during my first day of riding with this setup that the motor died on me.
Ignition:
Zeeltronics Total Loss with Zero Lightened Flywheel.
I ran the standard Wax curve as well as a more aggressive custom one which I had made for me when I bought the Zeel. I was only using the more aggressive one when I felt like the ski was close to dialed in. I did notice that whenever I switched to the more aggressive cure there was a noticeable difference in the tone and sound of my exhaust, basically more aggressive sounding. Looking back, now I'm wondering if that was actually a sign of detonation? Is it normal for the exhaust sound to change with the timing curves?
