Couple of questions about brakes and engine on my new-to-me 14

[j_rider]

First ride today of the 14 where it wasn't raining and enjoying getting to know the bike. Couple of questions and observations:

1. My bike has wavy front discs. Brakes were serviced not that many km ago by the PO. When slowing, under approx 15km/h I am getting some pulsing of the front brake, which becomes more significant the closer I am to stopping. This pulsing results in the brake diving a bit 2-3 times in the last 1-2 metres. It is not dangerous and braking doesn't appear compromised, but slightly disconcerting. Assuming that wavy discs don't always cause this behaviour, any ideas on how to resolve this?

2. Loving the engine of the 14. So different from the V twin of my SV. Here in Sydney we have a lot of 40km/h and 50km/h zones. I have noticed that the bike has minor surging when riding at these speeds (generally in 2nd-4th gear) on a constant throttle with RPM approx 1900-2100rpm. Makes it slightly challenging to ride at a constant speed. Is the slight surging normal for the 14?

I had read about aTREs & TREs (also had one in my SV which made a noticeable improvment) or advancing the ignition by filing the rotor. Would either of these solutions address the surging?

Thanks for any wisdom shared.

[Tally]

Hi @j-rider I had the same problem with my brakes when coming to a slow stop, it was due to sticking pistons in both calipers. you may need to take off the calipers and give a service yourself, make sure the pistons move freely in and out and clean off any residue you may fine . If they stick you may need to replace the seals or/and replace the pistons as well, as for your second problem I can't help you with that.

[seth]

There is a back plate mod
https://gsx1400owners.org/forum/index.php?action=downloads;sa=view;down=26
To advance the ignition it doesn't give more power but can make them smoother.
Brakes need servicing but wavy discs are always a bit noisy and can pulse a bit that's why I don't like them but others do .

[Snapey]

I've found that pulsing on OEM rotors was usually caused by the thickness not being consistent. Even a difference of .002" is noticeable at low speeds so check your rotors aren't similar although I've not seen this on wavy discs. Measure with a micrometer in about 8 places & on the same PCD.

Surging isn't normal so check that your throttle bodies and cables are adjusted correctly. You could try TRE's, timing advancing or pairs blocking but a well tuned 14 goes just fine without those mods.

[Nic]

I used to have a subtle surging at low speeds also, maybe surging isn't the right word? But it was annoying. I did the back plate mod and it fixed 90% of it, unless it's just in my mind.

[grog]

J, you just got it, be patient. Theres  a new owner check list on here somewhere, a great thing to do, just go thru it. Your brake prob, measure rotors  first im thinking. Motor surging, need to do all adjustments first, tight cables, balance throttle bodies, adjust tps, stps. Check chain adjustment. Advancer, pairs block after their done. Just my thoughts. Certainly run smooth when set up correctly, main bonus is after adjustments, stay constant for a long time. Mine always amazes me how sweet it runs, thats a lot of years appreciating it. 👍