Upgrade to enjoy this feature!
Vital MX fantasy is free to play, but Premium users receive great benefits. Premium benefits include:
- View and download rider stats
- Pick trends
- Create a private league
- And more!
Only $10 for all 2026 SX, MX, and SMX series.
I noticed earlier in this thread you shared your positive thoughts on TBI's but left out the issues you had with them. You should share those pics again.
Pretty much my experience too, have 80 hours on my 24 300XC and my wife just bought a 24 250 and we have had no issues what so ever. We race GPs and hare scrambles and I see a ton of these bikes out there every weekend and have seen none sitting on the side of the track.
The only modification I have done as far as tuning goes is cut half a coil off of the red idle adjuster as mine was almost bottomed out and still wasn't quite a high enough idle.
I have a good buddy that I ride with that fouled a plug on his yz few rides back. Left us on the side of the trail for about an hour and a half. Bike had about 10 hours on it.
Does this mean he should light it on fire and tell everyone the bike is a peice and in no way shape or form did he have anything to do with that plug fouling?
Another friend dropped a valve in his crf at about 45 hours.
Another crf blew out the rear spokes landing off a triple.
Another friends oil pump failed on his yzf and sent shit flying all in the top end.
I had a oil pump gear fail on an xcf that caused some damage in the top end.
What are we doing here?
The Shop
Free shipping: VITALMX
Luxon 4-Post Bar Mounts
$189.95 - $239.95
DeCal Works Huge Plastic Inventory of UFO and Polisport kits.
Wow, you guys are giving me the willies with all this talk of problems with the TBI Bikes. I just picked this up a few weeks ago with thirteen hours. The only thing i've noticed is some spooge on the silencer, other than that it ran great.
Granted, it still had some gas in there from the previous owner, who bought it from someone else.So i'm not sure how old the gas is, but I put some fresh premix in the tank to mix with the old gas.
So far so good, the bike is very nimble, but actually felt a lot like my 16 350 XCF W that I've loved as well.
The best mod we have seen from customer feedback on all the two strokes are RK-Tek heads.
I have a friend who has a ‘24 300SX he’s had since new. I think they had some bugs to be worked out with reflashes the first few months, but since then he’s had nothing bad to say. He’s scored some top 10s at LL a few years ago in 125 B/C and Schoolboy, he’s no slouch and the bike lives on the limiter, 90% of his riding is deep FL sand. He did a top end around 80 hours and now it’s just under 140 hrs and runs flawlessly.
Personally, I just prefer a carbureted bike for the simplicity. It’s the same reason I like manual windows and locks in my truck. Less is more to me, I’m not going to dive into semantics about peak HP because none of that really matters. I just like being able to work on my shit easily when and if I need to.
Personally, I find jetting kind of fun. It’s nice to take some unridable, blubbery POS and turn it into a crisp and responsive engine. It’s not very hard to do and only costs a few bucks in brass.
I also prefer a carb’d two stroke because of the engine characteristics alone. I ride my bikes to enjoy them, not chase lap times. Nothing puts a smile on my face like when my PC built 125 hits it stride and just never shuts off. When I rode a TBI TC125, within the first two laps I just knew it wasn’t for me because of the “4 stroke” like feeling. It just didn’t tickle my pants like an old carbureted bike does.
There’s a seat for every ass.
My pics of a blown up motor were from my 2020 husky 250. I never had a motor issue with a TBI bike. I did have issues with my early model 23 having a bog that a map fixed. Guess what my yz250 misses shifts and vibrates like hell, my 24 yz450 lost a Front brake at 20 hours. No reason for me to jump into every forum to bash them. Shit happens.
The 2020 tc250 was a gnarly motor failure though! 15 or so hours I recall and husky covered the entire thing!



Edit, I just remembered, I did blow a top end on my 24 from detonation. But I think that was the twisted map, their green map was lean as hell and apparently (they later told me) not to run that in deep sand. Again, I stand by my belief that the tbi 300’s are the best two strokes ever made!
Pit Row
Post a reply to: Feedback on New Fuel-Injected KTM Two-Strokes?