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Only $10 for all 2026 SX, MX, and SMX series.
I'm running a 52 also. Little more grunt coming out of corners and still plenty of length in the gears.
I used Wheelwx.com. Emailed them and he set me up with the rims and spokes that I needed. Laced them myself. He has complete wheels or spacers to run the KTM wheels. Super cool dude.
Going up one tooth in the rear helps with the sluggish feeling off the bottom, the FMF helped too along with a remap and cutting some holes in the side panel. Yeah my radiator leaked in the exact spot. Beta sent me a new one next day shipping.
This week my bike was running very rich, I learned about the stepper motor reset and it's running nice now.
Basically, to re-calibrate the EFI for the conditions, the bike needs to be cold, then started and let to idle for about 10 minutes (no throttle input).
[took only 6 minutes for my 450RX to get to operating temp in 90 degree weather]
https://m.youtube.com/watch?v=dR5p5X3I7zM
Highly recommend doing this every time you start out the day. I’ll even do it after a break mid-day if it gets considerably warmer.
On average it’s never more than 7 mins or so to get to 215.
The Shop
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Luxon 4-Post Bar Mounts
$189.95 - $239.95
Free shipping: VITALMX
Anyone know the captured nut size for the bottom engine mount bolt? Just happened to see the bolt was slid out but the nut has disappeared haha.
Here is the part number. I bought 4 of them but since I loctite'd them they haven't come loose. Actually went through and checked torque on every nut and bolt today. All good.
https://betausa.com/parts-diagrams/?aribrand=BMCY#/Beta_Motorcycles/450…
Ordered two thanks! Just blue loctite?
These are the same but cost less and ship more quickly.
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I'd go with Red loctite.
I had to add washers to take up the gap between the engine and frame before mine would stay tight.
Looking for input from the peanut gallery, bike wants to stall in tight corners when I brake hard and then get on the throttle hard. Happens only at initial throttle opening, keeping the throttle slightly open I can accelerate hard without issue.
I did the stepper motor reset and replaced the plug which I thought solved the issue, but over the weekend it started trying to stall in tight corners again, after about an hour of riding.
I think it's running rich, and as the air filter got dirty the stalling issue re-surfaced.
but,
Jared (3 Seas) thinks it might be a battery issue. Interestingly I checked voltage while the bike was idling and it was 13.35, however when I blipped the throttle it was jumping from 7 to 13.35 volts.
for context it was about 90F and humid, super dusty, I wasn't losing power like I would expect for a dirty air filter and the bike still starts and idles fine. Clutch was working good.
Stock battery? What mapping?
2024 mapping didn't have that issue, but I had it with the 2025.0 mapping and it went away after I got it updated to the 2025.5 specs. I am using a Firepower battery.
I expect the 2026 map to be released sometime before the end of the year, hopefully earlier as it could still use some cleaning up.
Side note, they finally released a tunable ecu, but the thing is $2500. No thank you.
The bike received a '25 battery and updated mapping when I got it in May.
In my mind it really feels like a mapping issue since it runs good everywhere else, maybe I need the 2025.5, that's a good thought.
I'm planning to do a stepper motor reset with the dirty filter and rag blocking the air box intake, maybe that'll outsmart the system and lean it out a bit 🤣
I found another potential issue too that might help with running hot.
My water pump impeller was bound by the acorn nut. (no free play side to side). I reinstalled with a washer between the nut and impeller, now it has a little free play side to side. Seems like the stuck impeller would reduce the cooling system efficiency slightly.
My 24 hasnt exhibited this issue with any of the maps, it didnt like the throttle being blipped when running a mixture of t4+ and pump gas, stepper motor reset fixed this issue. Only issues I have had is constantly peeling the graphics off of the shrouds and and side plates aswell as losing the engine mount nuts.
When I took mine into my dealer after I installed the FMF to have it mapped they also bumped up the idle 100rmp. I never had an issue before though so I can’t say if that would fix the issue. Also have a fire power battery since the stock one took a shit a week after I bought it. Beta had a update for the battery that they were giving to anyone that bought the 24.
So the ok beta started coughing and stalling on me at low rpm... Slow corners and even in the air. I built a legit mx track on my property and literally have a 70 supercross triple replica. Kinda scary when your bike dies on it lol
Anyway, it stalled a little around 1 hour then I did a stepper motor reset, fixed it. Well now it's really bad. Stalls so easily!! I'm gonna try the stepper motor again, already bought a new spark plug. Any new Intel on the battery? Anything else I could do if the stepper motor reset doesn't work? Thanks.
I'm trying out the leaner mixture hack tonight.
Jared said he's in contact with Beta regarding the battery voltage / stalling, I haven't heard anything back yet.
I'll add updates here when I get them.
One person sent me a DM saying to check the Cam Chain tensioner. That's on my radar too, but I don't have any irregular cam chain noise and I don't know if a malfunctioning cam chain tensioner would only show symptoms after an hour of riding.
Hopefully we can get these bikes figured out because I'm really liking mine!
Check your fuel filter that is in the tank. My bike was stalling easy during a race last weekend. I though that I may have been doing something wrong because the bike is easy to stall. But In my second to last moto of the day the bike sputtered to a stop in the last turn and would not restart. Ultimately it was crack in the fuel filter in the tank. So, as the pump is pulling fuel through the line, the crack in the filter is pushing the fuel back into the tank and not through the system to keep the bike running. Also, always check your motor mount bolts. I lost one completely and had another barley hanging on. This has all happened at 5 total hours.
I actually broke the top motor mount bolt in half! Was making an awful racket... I looked around and was missing half the bolt. Bottom bolts were loose as well. I am hoping is just the stepper motor reset. A lot of folks say to do it every time you ride and problem solved.. we shall see! I love the way the bike feels and handles. I'd hate to have the experienced ruined by this stuff continuing.
Pit Row
Geeez. Thread has a lot of scary stuff in it. Good luck, guys. Sounds like Italian motorcycles aren’t that different from Italian sports cars and women. Beautiful to look at, but high maintenance!
Yeah I have to agree and I like Beta’s. At one time I really wanted a 450 RX, I’m not in that camp anymore. My 2 stroke Beta 300 RX seems to be pretty solid.
I’m glad I went green. I have no complaints with my 24 KX450.
FWIW the Beta 450 has been much more durable and reliable than my '21 KX450.
Same holding up better than my previous gen yz450
It seems and feels to be of high quality. All the parts look and feel nice. I think it's just a teething process.. once the bugs are worked out, I have a feeling it's gonna be the best bike I've owned. I love the power delivery and handling! Just gotta get the low rpm figured out and it'll be spot on all around!
The little issues with the 24's are just that, little. I'm at 23 hours and haven't had an issue since I loctite'd the engine nuts, installed a high quality battery and got the 2025.5 map update. It stalled on me in one corner since the update and that was mostly on me.
The 450RX is a solid bike that just has/had some small teething issues. I'll take those all day long as Beta is head and shoulders above any other manufacturer when it comes to backing their product. Seriously, what other company sends out updated bar mounts to previous year owners just because? Engine sucks a valve at 40 hours? Chances are they will warranty it. Outside of obvious abuse, they will fix a lot of things at their cost.
Beta will get my money until I can no longer ride.
Really wish beta made a 250f or 350f rx model.
Don't let the 450 turn you away. It's unlike any 450 I've owned. I can ride it hard as I want and don't get arm pump. Only 450 I've ever not gotten arm pump on!!! It's super mellow but it has plenty of power if you go looking for it.
I expected issues for a first year model from a boutique Italian manufacturer, but the main areas of the bike are really good. Motor, chassis, suspension, and brakes are all superb.
Considering there are less than 500? of these bikes in the wild, and most people dont ride for an hour or more without stopping, I'm not surprised this issue is only now surfacing.
Unfortunately my stepper motor reset hack didn't resolve the issue. At 40-45 minutes the throttle response started to lag, and as I kept going it started to bog/stall, but only at initial throttle opening.
Considering Jared thinks it's electrical and the battery voltage drops from 13.35 to 7 when I blip the throttle, electrical system seems like a good place to continue the investigation. Could be voltage regulator or fuel pump getting hot?
Waiting to hear back from Jared's chat with Beta before I try anything else.
No luck solving this yet.
-No diagnostic codes
-Updated mapping
-New TPS
-Another stepper motor reset
-New GET battery
Paying closer attention, it seems like throttle response starts to suffer around the 30 minute mark, gradually getting worse, by 45min it will stall at initial throttle opening if RPM drops to near idle. It is not down on power. Keeping RPM up it is fine, although hard to ride that way. It starts and idles normally. Battery voltage is normal.
I'm at 30 hours now but atleast 2 hours are from doing stepper motor resets 🤣
Time to get your dealer involved, Beta will work with them to make it right.
Here's my list of things that didn't fix it:
Stepper motor reset
3 different maps (2025, 2025.5, +200rpm)
No Diagnostic codes
Spark plug
Spark plug wire depth (service bulletin)
Cam chain tensioner (service bulletin)
Throttle position sensor (resistance setting)
New Throttle position sensor
New battery
Check valve clearances (within spec but near the tight limit)
Shimmed valves clearances to be in the middle of the spec.
Checked grounds
Checked electrical connections for corrosion.
Checked fuel system pressure
Riding today AM: Ran great for 30 minutes then started to lose power, especially low end torque. Wouldn't pull the gear it used to in certain corners. Engine braking increased. Around 45 minutes began the stalling issue.
Plugged into diagnostic tool immediately, no indication of the problem. Tested some of the stuff from above.
Riding in PM:
Noticed immediately it was down on power, especially the low end torque. After 50 minutes the stalling issue returned.
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