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Look how everyone rides now…as soon as there in the air they are full gas and don’t let off when the back tire hits the ground. After awhile that has to take a tole on the tranny
Matthes was so uncomfortable when Phil opened up about it. That is what money does to you, so much for journalistic integrity.
Matthes has been a cuck for the MX deep state his entire career. Journalistic integrity was never a priority.
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This is who PC uses. I believe Star uses them as well, but I could be wrong on that part.
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In a sense, yes. That's also why some top 250 teams have to go the route of upgrading the transmission.
I’ve been riding Yamaha two strokes since 2004. Zero problems. For what it’s worth
Exactly this, people riding like dumb fucks and wondering why shit breaks.
WOT with no load to full suspension compression, with WOT is just asking for stuff to break.
In 50 years of racing, i have broken 1 gearbox, on an 83 Suzuki.
Pro's are going to kill stuff because they can, but there is no need to destroy stuff just because you want to sound fast.
Sorry to break it to you peoples but landing on the gas is proper technique to not have your bike feel like it's falling out the sky and splatting.
Only transmission I ever destroyed on a bike was a YZ
Same
Most of the failures seem to be traceable back to issues with the OEM gear shaft stiffness. Most teams are going to utilize an aftermarket approach with custom designed shafts, dogs, & gears with stronger (more $$$$) materials & superior manufacturing methods to increase the overall stiffness of the gearbox while also improving shifting performance & fine tuning the gear ratios to suite the engine's power delivery.
Steve knew what happened to Phil's bike before he had him on the show and still had him on, knowing he'd likely talk about it. If it was an issue, Steve just wouldn't have had him on the show.
If there was any discomfort displayed by Steve, it was concern that his buddy Phil was going to get in trouble for speaking the truth as he sees it. Not in that he is bought off by Yamaha.
Neither have I. It seems to be a problem with many YZ250s though. From my experience when it happens to someone, it keeps happening to them, but when it doesn’t, it never does.
I’ve blown second gear out of a YZ 450 and have had multiple people blow YZ 250 trannys apart. The 250 two stroke is a design flaw that they just don’t care to change. It only has a 3 dog window instead of 4 like most Other bikes. The 450 blew about half the teeth off second gear. Going back to what ML said they don’t design the thing for the consumer to go wide open 4th gear through the whoops. They could but then the price would jump up $500. I will say the Planko tranny in my KTM physically looks better and stronger than the ones in the jap bikes.
Hi, Fat slow C rider here. I had a transmission fail on my 2021 YZ250f with 8 hours on it. I'll see if i can find the photos. My fix worked great. I bought a honda.
Their boxes suck. Can't imaging their tranny's being any better.
So he doesn't know how to spell Pankl and you don't know how to spell Plano lol
Pit Row
Sure...
What gear are you hitting SX whoops in?
He’s never told a funny.
I guess you are worried after all...
"I don’t worry about you. Couldn’t care less"
Sure…
care to explain your hilarious joke?
Only if your worried?
There is a world of difference between landing on the gas, and landing WOT .
A skilled rider lands with matched speed, you do not see the spike loads in the gearbox doing that.
When you land with the wheel doing 60mph and the engine under no traction, as soon as it grips , the whole tranny slows up, and the motor doesnt and shit lets go.
When i worked in WRC, we used to stress test cranks by doing 100 WOT landings , because it would snap the end off the crank like a carrot with the spike loading , because the gearboxes were so strong to take the 4WD loading on asphalt with slicks.
And i have been in the car when they do it and its brutal, because you cant cant shut off because the car will nose dive, so you have to keep it pinned .
Its simple physics , you can stop the gears breaking, but then something else will go.
I saw a YZ250 motor today that was destroyed, due to a catastrophic failure , that was just down to abuse, no parts were worn, just busted.. and its always the same people who blow stuff up.
There are people you can watch riding , and know you are never ever going to buy a bike off them, and while i know i have never been Pro level, there are just as many 'slow' destroyers as there are fast ones.
No disrespect but it feels like this post is just trolling....lol
Sorry but your 16 year old isn't putting the same stress on the transmission that a top pro racing supercross is.
Impulse force loading - that's an effective way to find the weakest link. Sounds like the job might have had some fun moments.
And no, you're right, you don't have to be a pro to be good at breaking stuff - virtually anyone can be proficient at it if they're ignorant of proper operation and the potential consequences of failing to do so - hence your comment about a skilled rider.
@ML512 That's the name I was trying to remember. When NYK came from PC to MDK motors in 07 he was asking for some custom XTRAC internals. I recall it was pricey stuff. That said, it would be like buying the life insurance package to know that your tranny is much less likely to lock up in a rhythm section.
+1. There's no way that there are any critical parts on the bike that can't handle 1.2x normal working load, especially when the lifespan of race bikes is so short.
I’ve been on YZ250 2 strokes since 2008, probably 7 or so bikes. I sell them after I put about 100 to 150 hours on them (2 or 3 years). I had tranny failures on every one. Usually get 75 hours or so between failures and usually it is the dogs on third gear get rounded and it pops out of gear, a couple times it was a broken gear tooth. I’m an older vet rider, 63 now, but love to ride. BelRay Gearsaver oil helped. I fix them myself.
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