Solved -PJ695- Etienne Leroy's 198cc Voiturette

[Paul Jaray]

David Boyer?

Not David.
Not Boyer, but if you change one letter and rearrange the others, you'll have it.

[oko94]

Roger Boriet ? (surname is supposed to be six letter long, right ?)

[Paul Jaray]

Roger Boriet ? (surname is supposed to be six letter long, right ?)

Not Roger: Xxxxxxx
Not Boriet. (six letters, but not those)

[oko94]

Georges Robier ?

[Paul Jaray]

David
Roger
Georges
This name starts and ends with the same letter.

Ok, again, I made a mistake.
Not Boyer, but if you change one letter and rearrange the others, you'll have it.
Those ar 5 letters.

Boyer XXXX_ (4 letters right, none in the right position)
Robier XXXX_- (4 letters right, none in the right position)
Boriet OXXX_- (3 letters right, 1 in the right position)

[Wendax]

Emile Irroy?

[pnegyesi]

I am confused. 5 or 6 letters?

[Paul Jaray]

Surname is 5.
XXroy.
Name is 7.
Not Emile.

[Wendax]

Etienne Reroy?

[pnegyesi]

Leroy?

[Paul Jaray]

Etienne Reroy?

Leroy?

Wendax found the name and Pal the surname.
Etienny Leroy built this car using which engine?
Locked for you 2.

[Wendax]

Ydral?

(Your hint that four letters of Robier were right was misleading, as there is only one R in Leroy.  )

[Paul Jaray]

Kudos to Pal who found it despite my misleading clue, then.
Thank you for being so accurate, I hope in the future I will make less and less mistakes untill I'll reach perfection 
Not Ydral.

[Wendax]

Villiers?

[Paul Jaray]

not Villiers.

[Wendax]

AMC?

[Paul Jaray]

not AMC.

[Wendax]

Ultima?

[oko94]

Still locked ?

[Paul Jaray]

Open to all.
Not Ultima.

[Paul Jaray]

I really would like to call it solved...I need someone to finish it off or I won't be able to award a point.
I just need the engine it was used and since it's been a pure guessing name so far, it's just a matter of few more guesses.
198cc, not abscure at all.

[Carnut]

Heinkel?

[oko94]

Monet Goyon ?

[kwgibbs]

sachs?

[Paul Jaray]

no x 3.