It is meaningful to balance a stock(86) flywheel? Or it is necessary to buy 88 years?

You can take the extra weight off an 86 flywheel to make it a neutral balanced flywheel, but you'll have to be careful not to damage it. Remove all of the extra lump of metal and grind the weld marks to be flat and smooth with the flywheel. Paint it so it won't corrode.

There are many cars that used the same flywheel as an 88 Fiero, here are some:

2000 82 M.T.; (2BC)
2000 83-84 M.T.; 4-121 (2.0L)
6000 87-88 M.T.
BERETTA 87-89 M.T.
BERETTA 90-93 M.T.; 6-191 (3.1L)
BERETTA 90-94 M.T.; 4-134 (2.2L)
BERETTA 95-96 M.T.
CAVALIER 82-84 M.T.
CAVALIER 85-86 M.T.; 4-121 (2.0L)
CAVALIER 87-94 M.T.
CAVALIER 95-99 M.T.; 4-134 (2.2L)
CAVALIER 00-01 M.T.; 2.2L
CAVALIER 02 M.T.; 2.2L, VIN 4
CELEBRITY 87-88 M.T.; 6-173 (2.8L)
CIMARRON 82-84 M.T.
CIMARRON 85-86 M.T.; 4-121 (2.0L)
CIMARRON 87-88 M.T.; (6-173, 2.8L)
CORSICA 87-96 M.T.
CUTLASS 88-89 M.T., FWD; (6-173, 2.8L)
FIERO 88 M.T.; 6-173 (2.8L)
FIRENZA 82 M.T.; (2BC)
FIRENZA 83-86 M.T.; 4-121 (2.0L)
FIRENZA 87 M.T.; 4-121 (2.0L), VIN (8th digit) "1"
FIRENZA 87 M.T.; 6-173 (2.8L)
FIRENZA 88 M.T.; (4-121, 2.0L), VIN (8th digit) "1"
GRAND PRIX 88-90 M.T.
ISUZU HOMBRE 96 M.T.
ISUZU HOMBRE 97-00 M.T.; 2.2L (4 cylinder)
ISUZU PUP (PICKUP) 91-94 M.T.; 3.1L (6 cylinder, TBI)
ISUZU RODEO 91-92 M.T.; 3.1L (6 cylinder), 6 bolt transmission cover
S10/S15/SONOMA 94-98 M.T.; 4-134 (2.2L)
S10/S15/SONOMA 99-02 M.T.; 2.2L
SKYHAWK 82 M.T.; (2BC)
SKYHAWK 83-86 M.T.; 4-121 (2.0L)
SKYHAWK 87-88 M.T.; VIN (8th digit) "1"
SKYHAWK 89 M.T.
SUNBIRD 85-86 M.T.; 4-121 (2.0L)
SUNBIRD 91-94 M.T.; 6-191 (3.1L)
SUNFIRE 95-99 M.T.; 4-134 (2.2L)
SUNFIRE 00-01 M.T.; 2.2L
SUNFIRE 02 M.T.; 2.2L, VIN 4
TEMPEST 87-93 M.T.
ISUZU TROOPER 89-91 M.T.; 2.8L (6 cylinder)

I found this as an exchange list on an online used parts dealer. I'm not sure of the accuracy of this list, but I've heard from several sources that the 2.2 Cavalier flywheel will work. And the early Beretta's used the same transmissions as the Fiero, so they should work. The Isuzu and GM pickups with the 2.2 engine may be the easiest to find in Russia.

I dont' know why anyone would want to knock the weight off a pre 88 flywheel. The machine work would prob just cost as much as buying a new 88 one from GM. Seriously

I would recommend you have your assembly balanced, but if the crank is a neutral crank then get a neutral flywheel. Don't try messing around with modifying a pre 88 flywheel. Not worth it in my opinion.

Hope this helps. If so a + would be great

Why you speak, what I do not need to balance my flywheel? If I shall make it on the special equipment in conditions of a factory?

If you cannot cheaply get a factory neutrally balanced flywheel for your 3.1 it is possible for a machine shop to remove the counterweight and rebalance your existing flywheel to work with the internally balanced 3.1. Other than the way it is balanced, both flywheels are identical.

JazzMan

How it is better to balance? Together with cranked shaft or a shaft already balanced?

If you're balancing the flywheel to fit on the internally balanced 3.1 then all the machine shop needs is the flywheel, it will be balanced so that there is no offset weight effect at all.

JazzMan

Excuse me the electronic translator and to me it is not absolutely clear!!! I do not need to balance a cranked shaft 3.1 or for balancing it is necessary to fasten a shaft to a flywheel?

You don't have to do anything to the 3.1 crankshaft. When a shop balances the flywheel, all they need is the flywheel.

Thanks! I thought to me it is necessary to balance a cranked shaft together with a flywheel and clutch.