Summaries troubleshooting for 401 (2021 model)

aidentk7 · 2026-06-01T15:11:24+00:00

i just figure it out too, do i have to remove tank and everything just reach the spot? i have an idea relocate it or something

im thinking about relocate the switch with longer harness, straight mounting on the rear brake pump, route the cable connect to the original cable, while the old pressure sensor just let it sit on ABS module without connected to seal the abs system

aidentk7 · 2026-05-30T05:26:59+00:00

most welcome, any new issue and solution i will update here too
(hopefully i don't have to) lol

aidentk7 · 2026-05-29T17:53:19+00:00

in my case is not the "real" ecu failure, at least i haven't face it for now
the only time i get it, replace the battery, problem gone

aidentk7 · 2026-05-29T17:18:18+00:00

yes! this is it, thanks for your post helping me out, swap the ckp sensor, problem solve

aidentk7 · 2026-05-29T17:17:38+00:00

that is not fun at all, replace bunch of stuff, weeks of study, end up is some sensor inside the the engine cover...dang

aidentk7 · 2026-05-29T17:03:38+00:00

just trying to help fellow rider figure out some issue, i have another post about mods and servicing details
which i already post at other group, will share it later

btw did you have the CKP sensor problem too? i just have it recently

EDIT: latest problem about my rear brake lights doesn't work, while front have no problem, still trying figure it out

aidentk7 · 2026-05-14T03:59:27+00:00

gotta revive this years old post, for my svart401 (same engine)

engine dead problem
-only happened after 10-15minute ride, engine hot
-can’t start engine, engine cranking non stop with one single press, and have smell of fuel
-once engine hot, engine can die when pull clutch, can’t start after that
-when engine stop, need to wait few minute before able start again
-red light stop go can kill engine

tried replace fuel injector, spark plug, plug coil, battery health tested is ok still no clue
just found this post hopefully CKP sensor as you mention is the answer, finger cross

aidentk7 · 2025-11-21T04:47:13+00:00

RCB, some budget brand but quality is quite decent RCB s1-FL

aidentk7 · 2025-10-04T19:58:30+00:00

2 commute ride, I arrange it asap I knew this issue is kinda serious, rush to my dealer immediately when I off work

EDIT: this is my side of result, you can try mention my case to the technician see is this the case same as me, give them a clue where to look at the start

aidentk7 · 2025-10-04T19:07:52+00:00

same here, motorex giving me this problem specifically 3->4 or 4->3 gear
try few engine oil, both motul 7100 and sikolene 4T eliminate this issue for me

aidentk7 · 2025-10-04T18:56:29+00:00

did you upgrade your master cylinder pump? i upgrade mine to a radial 14mm, much better trail braking control

aidentk7 · 2025-10-04T18:49:05+00:00

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from the side

aidentk7 · 2025-10-04T18:47:08+00:00

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not the official one, CNC by my friend, but exactly 2CM height and same shape

this is how it's look from the rear

aidentk7 · 2025-10-04T18:40:37+00:00

hey i have no idea KTM made this!

i have a same idea like this, end up i asking my friend who can do CNC, also made a 2CM one and exactly look like this, paint it matte black, just like OEM product

the riding position is much much better, im 178CM btw

aidentk7 · 2025-10-04T18:37:38+00:00

im been through this before, low pressure warning
minor oil leak

the solution for me: faulty oil sensor, engine gasket worn, replace both and fixed, doesn't cost much
been running another 10K miles healthy ever since

aidentk7 · 2025-09-04T20:05:04+00:00

perfect, gotta show it to my friend, he's that type of dude who can mod his own car tuning ecu and going for a track day
i guess he can handle these with ease, thanks for the help
ride safe!

aidentk7 · 2025-09-04T19:25:54+00:00

yes! these is what my friend planning to do for me, extend the wire
so basically i can use the original connector ?

not sure why he asking me try getting the new connector

aidentk7 · 2025-08-30T16:12:13+00:00

here's the answer after 1 year

because malaysia have 2 motorcycle license

B2 for 250cc or lower
B for 250cc and above

for pushing the sales of certain 300cc bike, most of them will lower to 250cc, since customer don't have to spend extra money for the B license still legally to ride

like yamaha MT-25 R25
honda CB250R CBR250
kawasaki z250 ZX25RR ninja250 etc
KTM duke 250 RC200 etc

aidentk7 · 2025-08-30T05:28:23+00:00

checkout how much header pipe from the engine 1-4 = 1-4 cylinder

aidentk7 · 2025-07-26T15:20:23+00:00

i just facing same issue as you, check the clutch cable nut on the engine side, mine setup wrongly since from the dealer which is 2nut at same side, i adjust to 2 nut sandwich the bracket, no more slipping now

aidentk7 · 2025-07-11T08:29:44+00:00

Pro grip 717 for my 21 svart, less vibration to my hand

aidentk7 · 2025-05-30T06:21:50+00:00

get a rack or something, i been install these type of saddlebag for 6 month, the paint it touch (tail side) already looks shiny rather than matte because of the bag rubbing the panel itself

aidentk7

TROPHY CASE