GT550 H4 Headlight

[jaycee69]

I bought my gt550 a while ago and started restoring it. the question i have is what is the stock diameter of a gt550 light? my bike came with a non sealed beam that says "bosch 1 305 603 012 H4" ive tried looking around for the diameter and any info on it, but no avail.
i also tried measuring but couldnt get an accurate reading. please help. is anyone else using a non sealed headlight?

[jabcb]

The GT550 & GT750 use the same headlight.

Suzsmokeyallan has a sticky topic with the current part numbers to convert to an H4 headlight. See:
viewtopic.php?f=2&t=3343 (edited to make link visible)

[jaycee69]

Was that a suzuki headlight part number? it doesnt really tell me. and does anyone know the diameter of the stock 73 gt550 headlight?

[jabcb]

The sticky topic provides the current Suzuki part numbers for an H4 headlight that fits the GT750/GT550.

H.L conversion
35121-34430 H4 reflector unit, Koito brand (symmetrical flute pattern)
35136-34400 retainer ring for the H4 bulb
35173-20A01 rubber sealing boot

Here is a link for the H4 headlight on Babbit's online part diagram:
http://www.suzukipartshouse.com/#/Suzuk ... 1/09480031

[Coyote]

7". Just go to the auto parts store and get a standard 7" H-4 halogen headlight. That's what I did on my GT750. Fit like dream and it is a sealed beam unit. There has been some discussion on here about the glass not having the correct angular throw for a motorcycle, but I saw no discernible difference.