GEN 3 starting issues

[Dai.]

I used 95 as per the booklet and started having running issues, at the current time it’ll idle but throttle input upsets it and half the time the bike dies, awaiting to see what the dealer finds.

When it started sh..ing itself, I got warning lights on the dash for all kinds of stuff.

 

[Dmuff]

Bike had 5k plus miles with no problems. Then it happened many times. Sounds just like timing is advanced too much when it happens. After realizing it only started after switching to 87 and 89 octane fuel trying to save a buck, I ran most of that crap out and started using premium (91 in my area) again... 2k + miles and no problems since. Was that the cause??? idk but I will stick with 91+

 

[Dai.]

Fuel pump failure, warranty repair

 

[stellaro]

Now I have to travel like this!!! Tomorrow I'll drop it off at the mechanic to change the starter motor. I hope to solve it

 

[stellaro]

…jump starter…

 

[stellaro]

Finally happy, after two months I collected my Hayabusa (problems with the Suzuki Italia warranty which says "never happened!", 1000 procedures, computers that didn't work, spare parts not in Italy but delivered from Spain and Germany etc.) but at the end finally here it is again, with the problem solved. It all depended on the starter motor, which absorbed much more current when hot. they also changed some minor parts still related to the starter motor. Here I will try to attach the spare parts numbers.

 

[shade]

So did they replace with an updated unit?

 

[Chris0053]

When I took mine back to the dealer, they thought the battery might be bad so they put a new one in. (Bike was brand new, but 2022 model year, so battery could have been sitting for a long while). But replacing the battery alone didn't do it, they told me they then traced the wiring between the battery and the starter and found a loose connection somewhere in the chain (just had to be plugged in/seated correctly or something?), after that it appeared fine.

Done another ~1000 miles since then and have not encountered the issue again.
Note: have not put effort into explicitly reproducing the fault, just went about my days normally and haven't encountered it since.

Aprilia has this issue on some also, most replace battery cables with thicker gauge and make sure they are tight
and seems to solve the problem

 

[stellaro]

No, I think the unit is not update, but mine is faulty. I am now attaching the spare parts numbers

 

[stellaro]

My mechanic thinks that everything depended on the ovality of the pivot of this gear posted by in fact it coincides with the fact that as the kilometers went by the problem became more and more frequent until it was present every time I started the engine

 

[stellaro]

Photo by PASHNIT !

 

[wellcraft]

Reading about this hot start issue is making me a bit wary about buying a Gen III, don't want to spend 20 grand on a bike that won't start.

 

[stellaro]

Suzuki Italia says that I was the only one who had this problem

 

[60+ Busa Rider]

Recent comment from org member said Suzuki or dealer said it can be caused by using octane lower than what Suzuki recommends. It’s stated on the tank decal minimum octane requirement. I removed my decal but I think it said 92 octane minimum. I only use 93 octane with no starting issues so maybe that’s the fix.

 

[shade]

I dont think the wrong octane is a cause.
Lower octane ignites easier, so that seems to make little sense.

Has anyone tried the same fix as the aprilia's?
A much larger battery cable to the starter.
Friend has an aprilia with the same exact symptoms as some of these gen 3 busas.

Slight throttle opening and then try to start works. Overall fix, a fat ass battery cable.

 

[60+ Busa Rider]

I dont think the wrong octane is a cause.
Lower octane ignites easier, so that seems to make little sense.

Has anyone tried the same fix as the aprilia's?
A much larger battery cable to the starter.
Friend has an aprilia with the same exact symptoms as some of these gen 3 busas.

Slight throttle opening and then try to start works. Overall fix, a fat ass battery cable.

You have some excellent points, low octane gas self ignites easier than higher octane gas, this easier self ignition can cause the gas to pre-ignite when the 12.5:1 CR is combined with the hot cylinder temperature which will try to send the piston backwards causing the kickback. As I stated I’m not sure if this is exactly what’s happening but in theory it’s definitely a possibility.

As far as the larger battery cables you are absolutely 100% correct. Cable size has everything to do with how many amps can be delivered to the starter. We can buy higher amp rated batteries all day long but if the cables can’t carry the amps then the battery can’t send the amps.

If the actual cause is pre-ignition on hot starts then higher octane fuel or larger cables could both have the same results making for the argument that high octane gas fixed one motorcycle and larger cables fixed another motorcycle.

 

[60+ Busa Rider]

Slight throttle opening and then try to start works. Overall fix, a fat ass battery cable.

I forgot to mention slightly opening the throttle sends cooler air to the cylinder cooling the cylinder temperature stopping the self ignition.

 

[stellaro]

In fact, the BMW K1300S, which I had before, had a similar problem, which was overcome with the recall and replacement of the larger cables. But on the Hayabusa, both the larger cables and the constant use of 98 octane petrol changed nothing

 

[Vanishing Point]

Swap to 4AWG / Battery>StarterRelay>StarterRelay>Startermotor +
Neg. Battery > Under Startermotor bolt lug

 

[60+ Busa Rider]

In fact, the BMW K1300S, which I had before, had a similar problem, which was overcome with the recall and replacement of the larger cables. But on the Hayabusa, both the larger cables and the constant use of 98 octane petrol changed nothing

Thank you for confirming that’s good to know.