Odd-ball Bolt Size

jaydee75 · Nov 15, 2017

As an owner of 3 British bikes and an old Austin Cooper S, as well as several Japanese bikes, I've seen a lot of odd ball bolts. But I found one on my RD350 that I've never seen before:
The bolt holding the alternator rotor onto the crankshaft taper is a 7mm bolt with a 11mm hex head.
Seemed very unusual to me. Has anyone else run into a 7mm bolt?
Just curious................ and I wonder WHY.
Jaydee

texasSlick · Nov 15, 2017

7 mm dia. x 11mm hex head is a standard DIN size, albeit uncommon.

Slick

nickguzzi · Nov 16, 2017

jaydee75 said:
As an owner of 3 British bikes and an old Austin Cooper S, as well as several Japanese bikes, I've seen a lot of odd ball bolts. But I found one on my RD350 that I've never seen before:
The bolt holding the alternator rotor onto the crankshaft taper is a 7mm bolt with a 11mm hex head.
Seemed very unusual to me. Has anyone else run into a 7mm bolt?
Just curious................ and I wonder WHY.
Jaydee

If IRC 7mm fasteners were "popular" on Laverdas.

marinatlas · Nov 16, 2017

Hi, you could find them on French cars , such as Citroen ...........!

concours · Apr 8, 2018

My VW TDI has 7mm bolts holding the pressure plate to flywheel. DAMHIK

Fast Eddie · Apr 8, 2018

marinatlas said:
Hi, you could find them on French cars , such as Citroen ...........!

Indeed, you can probably find an example of most things ever invented on a Citroen somewhere!

Their designers obviously go to different design schools than the rest of the auto industry ...

Danno · Apr 9, 2018

Just got done resurrecting a '66 Yamaha Big Bear and I noticed several odd fasteners one doesn't normally see. This may have been some early nose-thumbing at Honda, who seemed to have given all the other Japanese manufacturers such an inferiority complex that they did some unique engineering (some quite elegant) to overcome.

In heaven, the police are British, the chefs are French, the engineers are German and the designers are Italian.

In hell, the police are German, the chefs are British, the engineers are French and the designers are Italian.

Bernhard · Apr 9, 2018

There is a reason for the rotor bolt on the Yam being 7mm, namely to stop amateur bodge up mechanics using other non -high tensile bolts on the fast revving crankshaft !

Fast Eddie · Apr 9, 2018

Danno said:
In heaven, the police are British, the chefs are French, the engineers are German and the designers are Italian.

In hell, the police are German, the chefs are British, the engineers are French and the designers are Italian.

Love it !!

Bernhard · Apr 10, 2018

re, "
In heaven, the police are British, the chefs are French, the engineers are German and the designers are Italian.
In hell, the police are German, the chefs are British, the engineers are French and the designers are Italian." QUOTE

Yea, but what about the Japanese who have made more bikes than all the above put together?

Danno · Apr 10, 2018

Japanese don't believe in Heaven and Hell.

Shelby-Right · Aug 29, 2022

jaydee75 said:
As an owner of 3 British bikes and an old Austin Cooper S, as well as several Japanese bikes, I've seen a lot of odd ball bolts. But I found one on my RD350 that I've never seen before:
The bolt holding the alternator rotor onto the crankshaft taper is a 7mm bolt with a 11mm hex head.
Seemed very unusual to me. Has anyone else run into a 7mm bolt?
Just curious................ and I wonder WHY.
Jaydee

Is it a FRENCH model

? Peugeot have weird sizes to .

Odd-ball Bolt Size

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