Posts
5
Joined
2/4/2025
Location
Inver, GB
Having problem with slow crank
So Far
Replaced battery 3 times and also installed battery out of a larger bike. Still slow crank 12.7 v at starter
Remade all earths
Bypassed starter relay still slow crank and stops if you crank open throttle.
Back off idle screw engine cranks quickly but will not start.
Replaced starter motor same problem.
Open idle screw bump start bike runs perfectly.
I am at my wits end hekp would be appreciated.
Potentially decompression mechanism not working as intended. Does the starter sound like it's struggling to overcome excess compression?
Starter clutch? They get old and slip.
Thanks for coming back to Me the Ktm 250 SXF does not have decompression , also the clutch is not slipping . Starter motor engages but does not turn over all the time.
I have read threads with a similar problem but no one has posted how the issue was resolved..
Since posting I have borrowed a starter motor of a similar bike which works perfectly but on mine struggles to turn over, even bypassing relay cables straight on to starter.
If i back of idle adjustment and zero throttle it will turn over.
Bump starting not a problem runs perfectly.
Its not the starter, it's the torque limiter I bet. Mine did this and I swapped these from another motor I had, problem fixed.
https://www.rockymountainatvmc.com/oem-schematic/5?FirstChoice=KTM&SecondChoice=1719&ThirdChoice=1743&assemblySchematic=58410
Part 6
79240016100
(replaces part #
79240016000)
Torque limiter
The Shop
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Thanks just to be 100% certain , the torque limiter will stop the bike cranking if it has failed. If so looks like its a new Torque limiter
Yes the starter will spin but it won't engage the motor completely.
Sorry I did not make myself clear. The starter motor stops completely and the current goes through the roof.There is no whirring noise
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