Super Jet 62T Flywheel lightening

[xeriotti]

Hi everyone!, Im looking for exact measures lo lighten a 2009 Superjet 701 (62T) flywheel as much as possible remaining reliable, I know theres a couple guys in the X that offer that service and im not trying to steal bread from their mouths... I want to improve my ski and living in Argentina isnt a good starting point, theres no aftermarket parts easily available and getting them from abroad turns excessively expensive and tyring (lots of paperwork and burocracy)

So... The idea is to machine my own flywheel.... I need to know outer diameter, outer wall thickness, front face thickness and if its been faced tapered, conical or something how many degrees from where to where... If extra holes are drilled diameter, location, etc would be great help.... Drilling the starter ring seems good idea also... hole diameter would be good data

Thanks everyone for the help... Ill post pics of the process when i get the specs!!!

 

[badvinny]

Its like the Lotus Super 7, keep lightening till it falls apart and then put a little back in!

 

[xeriotti]

Its like the Lotus Super 7, keep lightening till it falls apart and then put a little back in!

If it falls apart (i imagine it would grenade and cut my hull in half sinking whatever thats left) .... I guess id be out of the sport for life!!! jajajajajaja

Noone has one of those flywheels and some measuring tools lying around to give me a hand???

 

[Harbor]

Best I could do.... The face looks like it tappers out from the center to the edge then the edges is rounded

 

[xeriotti]

View attachment 315904 View attachment 315905 View attachment 315906 Best I could do.... The face looks like it tappers out from the center to the edge then the edges is rounded

Harbor!!! Thats great information!!! Do you know who did that lightening job and whats the weight??

You think the starter ring is also machined? Any other specific data or other flywheel specs would be ver helpful!

 

[Harbor]

The back side of wheel behind the gear is machined to same diam as the front side. See pic....here's some more pics

Hope this helps cut your own wheel

 

[xeriotti]

The back side of wheel behind the gear is machined to same diam as the front side. See pic....here's some more pics

Hope this helps cut your own wheel

Pure GOLD!!! Thanks! You have now a friend in Argentina! .... Ill post pics as soon as possible... Been working on the ski over the winter... Milled head, Bored Nozzle, Re-Sleeved stock pump wear ring with stainless stell to 0.10mm, Blueprinted pump, sealed everything to get rid of turbulence, cavitation and evil stuff...

Ill try it this weekend. Ill be doing the flywheel spell soon... Thanks again!

 

[xeriotti]

Well.... I finally went for it!!!

Removed the untouched flywheel...

Pulled it out using a extractor similar to this one...

A small tap with extractor bolt under load and came off with a nice BANG!

Stock it Weighted 1.694 grams (3.73 lbs)

Centered it on the lathe and proceeded to remove material... Turned the outside diameter of the body both sides of the geared ring and around the hub, faced it with a slight taper leaving more material in the hub area.

Back to the scale.... 1.378 grams (3.03 lbs) A difference of 316 grams ( 0.7 lbs aprox) It can go much lighter but i rather keep it reliable!

Mirror polish to get rid of possible stress build up due to tool marks... Sharpie, Laquer, and back to the ski.... Ill keep you guys posted if i could notice any difference in the water... On land starter spins the engine much quicker and idles mch higher.

 

[Freakrider]

In my experience, you will feel the difference more boring a stock reduction nozzle to 85mm than the flywheel mod. However they are all small pieces in the puzzle that add up to include an msd enhancer and so on. Good luck.

 

[xeriotti]

Its a 62T 701cc

Actual Engine/Pump mods...

-Solas Concord 9/15 w/stainless sleeve @ 0.1mm
-Bored Nozzle to 85mm
-Milled head 0.7mm (0.027")
-Carb Chokes removed and smoothened holes
-4 of 6 intake grills removed
-Lightened Flywheel

-MSD Enhancer should be arriving near weekend. (Got a deal on it and couldnt resist)


Saving to get...

-Factory B pipe.
-Porting when winter comes
-Big bore top end when compression fades.