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 Post subject: GT750 J Front Drum Brake
PostPosted: Sat Nov 17, 2018 7:29 am 
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Moto GP
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Joined: Sat Feb 07, 2009 12:43 am
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Location: Ontario
Country: Canada
Suzuki 2-Strokes: GT750(Jx3,L,M,A,B),T500
I'm trying to gather additional information for an update to the GT750 Field Guide about the front drum brake. This follows on from a discussion thread on the KC board in the UK. To make it interesting, I'm running a small contest of sorts and you can read about it at this link on my OJB Facebook page. If you have a GT750 J with a frame number lower than about 12000 then I'd like to hear from you ! 8)

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PostPosted: Sat Nov 17, 2018 9:54 am 
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Moto GP
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Joined: Mon Dec 13, 2010 4:32 pm
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Location: southwestern Pennsylvania
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Suzuki 2-Strokes: 69 T350 thru 75 GT750
Interesting. This is more complicated than I was suspecting.

I didn’t use a washer on my GT550 cafe build. Vaguely remember it having a single washer when I disassembled it but there was no room for a washer when I put it together.

I bought a 4LS via eBay some years ago. Used it on my 72 GT380 cafe build. Was a tight squeeze but it fit fine. Didn’t use a washer.

Do you have any measurements so we can figure out if we have an early or late 4LS?

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Suzuki:
GT750 2x75
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GT380 72
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T350 69, 71 & 72 project
T250 72
Honda 85 CB650SC & 86 CB700SC
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PostPosted: Sat Nov 17, 2018 10:22 am 
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Moto GP
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Joined: Sat Feb 07, 2009 12:43 am
Posts: 3195
Location: Ontario
Country: Canada
Suzuki 2-Strokes: GT750(Jx3,L,M,A,B),T500
jabcb wrote:
Do you have any measurements so we can figure out if we have an early or late 4LS?


The later style drum brake assembly using no 5mm spacers (these are part number 09180-15019 by the way) measures 165mm across the full width with the brake plates in place. The only difference between the the early and late drum assemblies seems to the the side plates - the later ones have a raised centre boss. The drum itself appears to be the same. That then would indicate an earlier style assembly must measure about 155mm across. 8)

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