Flywheel nut?

Hey guys, I need your help. I have a Motograziella that is missing the flywheel nut. It's a fine thread, about 6mm in diameter. I tried a regular old metric fine threaded nut, but no go. I know some if not all of these threads are a special cut, but is it the same from manufacturer to manufacturer. The flywheel itself is a Bosch.

Any suggestions as to what might fit, something from another moped. I'm assuming Motograziella parts are non-existent.

Thanks, Deron.

Re: Flywheel nut?

post pictures w calipers too.

Re: Flywheel nut?

Re: Flywheel nut?

Downhill Harvey (OFMC) /

Re: Flywheel nut?

todd amundson /

6mm flywheel nut, that’s nuts

Re: Flywheel nut?

Also, it's a Sachs engine. German engine. I have other Sachs engine bikes, totally different engine though.

Deron.

Re: Flywheel nut?

I'm still looking. I tried a nut and bolt supply house. Ace Hardware, Lowes and Home Depot, nothing but standard stuff. Even tried a motorcycle/scooter/moped shop.

8mm is too small, 10mm is to big. It could be either 8.5mm or 9mm. Fine thread, do not know the pitch.

Deron.

Re: Flywheel nut?

todd amundson /

It’s most likely 10x1.25 or 10x1.50.

Home Depot has 10x1.50

Ace has both near me.

No way it’s a half size.

Also it could be someone put a 3/8” die on there to fix messed up threads before you had it.

Re: Flywheel nut?

Ace will always have these nuts, you were looking for. They have them is a specialty nut/bolt section. Just ask one of the staff. Have tour mind blown at their selection of moped hardware! Always a better selection than Home depot or Lowe's. Both of those stores have only 3 or 4 drawers dedicated to metric so they too can easily be missed.

Re: Flywheel nut?

Tools to identify thread size: calipers. pitch tool. alligator teeth do dad

Re: Flywheel nut?

I tried Ace Hardware, no greater selection then the other places. A 9mm nut from Treats and it's a hair too big. 8mm is too small and 9mm is too big. It has to be a special cut size just for that crankshaft. The threads look fine.

Re: Flywheel nut?

I'd re-thread it for a nut I had on hand . ;)

Re: Flywheel nut?

OK, I got a idea. The previous person that worked on the bike, tried to pull the flywheel with a two prong puller and was unsuccessful. He put a a lot of force on it, as the flywheel, where he grabbed it with the two prongs was bent, outwards. The threads look good, but the force of the center of the puller, might have belled out the starting end of the threads. I'm going to pick up a 8mm die and see if that can correct the belling of the end of the shaft.

Re: Flywheel nut?

Moped Lar (OFMC) /

Common issue caused by folks too cheap to buy the proper puller.

> Deron Miller Wrote:

> -------------------------------------------------------

> OK, I got a idea. The previous person that worked on the bike, tried to

> pull the flywheel with a two prong puller and was unsuccessful. He put a

> a lot of force on it, as the flywheel, where he grabbed it with the two

> prongs was bent, outwards. The threads look good, but the force of the

> center of the puller, might have belled out the starting end of the

> threads. I'm going to pick up a 8mm die and see if that can correct the

> belling of the end of the shaft.

Re: Flywheel nut?

> Deron Miller Wrote:

> -------------------------------------------------------

> OK, I got a idea...

> ...I'm going to pick up a 8mm die and see if that can correct the

> belling of the end of the shaft.

=================================

Measure twice, cut once.

pitch.jpg
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