My 250 rr is a really great bike. Best handling bike I ever have had. However it has under 20 hours in total but already a couple of irritating issues. After reading here and at other places it seems a great fix often is to get the part from KTM. Let's not make this a KTM vs Beta thing, instead let's share info on how parts from KTM (or other manufacturers) made your bike better
UPDATE: Included some of the great info from this thread here on the first page to make it easier to read. Many thanks to to Enmerdeur and Dirtdogger300 for contributing. As of now I have only included the info where you guys provided parts numbers (or part numbers that I could easily find). Many parts from Enmerdeurs list I am not sure what years that fit (example cylinder heads or sprockets from KTM), if someone provide accurate info on that I will include it also.
The parts from other bikes that makes our Betars better list
1. O-rings for the cylinder head
Issue? Pressure in the cooling system (even when cold) do to failing Beta OEM O-rings
Fix: Get the O-rings from a KTM
Part numbers (for the 250cc):
0770730020 O-RING 73,00X2,00 VITON
0770105020 O-RING 105,00X2,00 07
2. Airbox clips
Issue? Beta clips tends to break very easily
Fix: Get the KTM Clips
Par numbers:
54806108052 BLIND RIVET 3,3X9,7 GROOVED | 04,
54806008050 QUICK RELEASE-SPRING HANGER.
3. Pipe O-rings
Issue: The Beta/FMF O-rings seems often not to last that long
Fix: KTM Green Viton O-rings last longer
Part number: 0770440030 O-RING 44,00X3,00 VITON
4. Fuel petcock
Issue: Several Beta fuel petcocks seems to have an issue of not being closed when in “off” position.
Fix: First, try to bend the metal plate behind the Philips screws to put more tension on the rubber seal. If that doesn’t work a KTM petcock is a good fit and doesn’t have the same issue.
Part number: 54807004000 GAS COCK ON/OFF/RES 03
5. Banjo front break bolt
“Issue”: The OEM Beta integrated brake sensor aren’t the cleanest looking unit.
Fix: A Yamaha female hex type unit fits and is a low profile unit giving the bike a cleaner look.
Part number: 90401-10172-00 BOLT, UNION
6. Radiator louvers
Issue: Beta radiator louvers are a bit “flimsy”
Fix: KTM units fit right in and are more robust
Part number: 7733503400030
...