This starter motor is used in Beta RR 430 (MY 2016) dirt bike and very likely in its other variations like Beta RR 350 / 390 / 480.
So, my starter died.
Before you start
Read if any of the reports apply to your bike.
Reports
Beta RR 430 (2016)
This article is based on Beta RR 430 (2016). You can read about issues in the section below:
Beta RR 430 (2018)
Beta RR 430 2018 which also uses Mitsuba SM18 12V the starter motor requires the shaft (commutator) to be the same length as the OEM part. Therefore you can’t use the shaft from the knock-off part as it is slightly shorter. You can however reuse the shaft from the OEM part if it’s intact.
Thanks to Leon for reporting this issue
Removing old starter
It’s fixed to the bike with two screws and two wires, so the removal is fairly quick.
NOTE: Before opening the housing, it’s always a good idea to mark how it all goes back together. Take a sharpie and make some marks across housing parts or even scratch them with a screwdriver, so you can line the marks later. It’s not a big deal if you forget to do that, housing has a notch that helps with aligning it.
Look inside
See this
Fixing instead of replacing?
Clean the mess inside if you plan on doing that, keeping track of the destroyed magnet parts, and try to puzzle back as many as possible. I could salvage only 5, but it does indeed work, even with 5 magnets, but I opted to rebuild the whole thing anyways. If you’re planning to just reglue them, remember to check the polarity of the magnets as they should be alternating going around the frame. Take one of the magnets, or just any magnet, holding it in the same orientation move it in front of the remaining magnets in the housing, one will pull, another will push, and so on. You’ll figure it out.
I used epoxy resin.
KTM starter motor knock-off
Beta RR 430 (2016) starter has a part number of 029.07.000.80.00
(029070008000). It costs 208€ excl. tax as of the time I’m writing this post
(2024-04).
There is a Chinese replacement for the KTM’s starter with a part number
55440001000, 55540001000. It is 90% identical with the one used in Beta. I
paid for it
45€ on AliExpress.
Here it is right next to the stock one.
As you can see it has a bit shorter shaft, but that does not affect the way it engages. From my tests (and from the gear marks on the old shaft) it contacts the gear its moving fully.
What doesn’t fit
As I said it’s 90% identical, and 10% different.
The part that mounts to the bike has differently angled arms, therefore you have to reuse the old part.
What does fit
Everything else, meaning:
- Magnet housing
- Brushes
- Commutator
- Front housing with the bearing
Leftover pictures
Questions?
You could try asking me questions at hi@zwid.net
Gib moni?
Have I helped? Kick whatever-you-feel-like out of those 150€ that this article might have saved you at my Bitcoin address:
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