Any ways to lighten the flywheel? Atc90

[vartiak15]

I think I had read in a post a while ago that someone had a lightened fly wheel for the atc90, is there any pictures out there or tips on how to do it correctly?

[Lil Earl]

what is the point of doind it

[Yamaha_Rules69]

Are you trying to gain faster revs? You loose bottom end by doing so, and unless your motor isnt hopped up a little (bigger carb, high comp piston, etc) It wouldnt really be logical. The correct way is to put it in a lathe, and turn it down a bit, and depending on the design, drill large holes on the face side of flywheel.

[KI4UJO]

If you lighten the flywheel, it allows you to accelerate and decelerate faster. As for lightening it, I'm not sure exactly how it's done, but it would involve removing material.

[shortline10]

Not possible with the Atc90 model flywheel and if you look at the flywheel you will understand why . CDI atc110 models can be lightened .

[vartiak15]

Thanks shoreline that's why I had to ask I just didn't see it being donel on the points motors, so for the cdi model just put it in a lathe.?

[greenhuman]

You can lighten the ATC90 flywheel.
I have seen a Jim Babbit built 180cc 90 with lightening holes drilled in the top and bottom flywheel plate.
It also had a an oil bypass system which consisted of a copper line coming from the oil pump and it was wrapped a few times around the inlet manifold then into the head. As it was a methonal burner the inlet manifold ices up and cools the oil. There was also half a spark advancer and lightened rockers. Also tiny holes drilled into the top of the piston to help push the top ring out against the bore.
All this was added to a Pauter Machine 61 x 61 crank and bore, 30mm inlet valve and dual roller Pauter head.