Recently my son and I picked up a nice low miles 2016 GSX-S750 to upgrade from his GS500. The bike had obviously been tipped over a few times but nothing bad.
While installing new levers I noticed something bizarre. The angle of the clutch lever mount to mirror stem is 90°. But on the brake side it's more like 110° or 120°. So when the mirror stems are parallel to each other the brake lever is angled down quite a bit more than the clutch. Of course if you rotate the brake perch so the levers are the same angle then the brake-side mirror is leaning way back. Plus the brake lever pivot bolt hits the throttle cable tubes.
While it's possible someone swapped the brake perch assembly from a different bike I can't imagine the previous owner would have done that. Plus there was no other real damage or noticeable problems with the bike other than the broken lever ends.
Don't mind the cheesy brake lever. I was just experimenting.
The thing is there's nothing damaged regarding the assembly. It's just a different offset to the clutch lever side. I don't have anything else to compare it to since my other bikes are a good 10 years older. But it just doesn't seem right.
If someone with a GSR or GSX-S could see what their brake assembly looks like regarding the lever to mirror stem angle then I would at least know for sure that this assembly is incorrect or not. I can't imagine that it would be correct but I'd hate to order a new one and find out it's the same.
Just checked an OEM parts diagram and the master cylinder assembly it shows has a 90° angle between the lever and mirror stem/master cylinder. I don't think the assembly on the bike we purchased is original to the bike, which is just really bizarre. A new assembly is close to $200 so the search begins for a compatible used assembly.
The model having been in the U.S. for only a few years makes sourcing used parts for it here very difficult.
Gotta love used bikes. Most of the time they're fine but once in a while...
Here's an example of the master cylinder assembly I think might be on the bike. These are the cheapo sets you find on eBay for $15 to $20. If you look at the angle where the lever pivot mount meets the fluid reservoir you can definitely see that the lever pivot is angled down.
Found a used GSX-S750 master on eBay. It was trashed with a likely broken threaded insert for the cap in the reservoir and they still wanted $66 plus shipping. Ridiculous.
I'd be taking a trip back to the dealer and have them rectify the fault, it certainly looks like either the brake or clutch perch is not OE for the bike, it could well be a Suzuki perch but from a different model.
Yeah no dealer is going to care or probably even have a clue about it. 90% or more of the time it's riders who find problems with production bikes.
This morning I took a look at the Bandit 1200 controls on my modified SV1000S and both the brake and clutch masters have the same lowered lever mount angle as the GSX-S750 brake master. So it would appear the clutch perch is the actual culprit.
Can't believe Suzuki engineers would be so sloppy as to use lever mounts with different angles. You would think they would have at least made a perch clamp with the mirror stem mount angled. Something that simple would avoid this whole mismatched lever angle issue. Maybe there is a clamp like that somewhere.
Worst case if this can't be sorted reasonably with production parts then we'll remove the stock mirrors and go with bar ends.
I'd really like to hear from some other GSX-S750 or GSR owners who could take a look at their control setups so we can find out if other bikes have this same issue or if the bike we got is just goofy.