21 yz250f

Leeham
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Leeham 3/10/2021 1:30pm
3/10/2021 1:30pm
I havent had any issues at 38°F or so. Bike starts up fine for me, just make sure the idle is set right otherwise its a bitch to start and will stall and foul plugs.
sandtrack315
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sandtrack315 3/10/2021 3:31pm
3/10/2021 3:31pm
wrc777 wrote:
Any issues with slow starting hot or cold? I know it was an issue on the 2020 250FX.
No
zeromarine
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zeromarine 3/10/2021 5:35pm
3/10/2021 5:35pm
wrc777 wrote:
Any issues with slow starting hot or cold? I know it was an issue on the 2020 250FX.
I turned the idle up just a tad on mine, it cranks just a bit longer then my honda did but seems to start fine all the time hot or cold.
Rohr144
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Rohr144 3/11/2021 6:24am
3/11/2021 6:24am
I wanted to see if I could get some insight from you guys and if anyone else is having the same issue. I have a 2019 YZ250F and it stopped running at about 13 hours on the bike (2 years ago), it had carbon built up on the valves and it got warrantied and fixed. I just did a top end at 65 hours on the bike because it would barely run anymore, and it had carbon on the exhaust valves, making them leak. What could cause this problem? I run the Keefer Free Feeling map, 1 tooth down on rear sprocket, and ran half/half T4/93 for most of that time.

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zeromarine
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zeromarine 3/11/2021 8:22am
3/11/2021 8:22am
Leeham wrote:
I havent had any issues at 38°F or so. Bike starts up fine for me, just make sure the idle is set right otherwise its a...
I havent had any issues at 38°F or so. Bike starts up fine for me, just make sure the idle is set right otherwise its a bitch to start and will stall and foul plugs.
On the app where is the idle showing for you? Mines just in front of the triangle above the 25 I would guess about 2100 approx judging by the app. Just curious what others have their idle set and where it’s showing on the app. Thanks
CornflakeJackson 3/11/2021 7:58pm
3/11/2021 7:58pm
Does anyone have experience with the GYTR head and piston? It’s pretty awesome that Yamaha offers this stuff and I wonder how it compares to other tuners’ engine packages (Twisted, XPR, Pro Circuit, etc)



https://shopyamaha.com/product/details/yz250f-high-performance-kit-gytr?b=Search&f=2021|139&ls=yamaha-motor-company&dealernumber=


tek14
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tek14 3/11/2021 9:57pm
3/11/2021 9:57pm
Yamaha should sell intake without screen like in that Gytr photo as option. In EU seems impossible to get No Toil kit and Twinair is just too expensive for simple fix.
navalseabee
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navalseabee 3/12/2021 4:53am
3/12/2021 4:53am Edited Date/Time 3/12/2021 4:56am
CornflakeJackson wrote:
Does anyone have experience with the GYTR head and piston? It’s pretty awesome that Yamaha offers this stuff and I wonder how it compares to other...
Does anyone have experience with the GYTR head and piston? It’s pretty awesome that Yamaha offers this stuff and I wonder how it compares to other tuners’ engine packages (Twisted, XPR, Pro Circuit, etc)



https://shopyamaha.com/product/details/yz250f-high-performance-kit-gytr?b=Search&f=2021|139&ls=yamaha-motor-company&dealernumber=


Most shops I’ve spoken with say the GYTR kit is nice but very mild and leaves some performance on the table compared to what they could offer.

Edit: above speaking strictly about the head and cams. No idea what GYTR is doing with the Vortex.
1
Zycki11
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Zycki11 3/12/2021 7:29am
3/12/2021 7:29am
navalseabee wrote:
Most shops I’ve spoken with say the GYTR kit is nice but very mild and leaves some performance on the table compared to what they could...
Most shops I’ve spoken with say the GYTR kit is nice but very mild and leaves some performance on the table compared to what they could offer.

Edit: above speaking strictly about the head and cams. No idea what GYTR is doing with the Vortex.
I believe that Keefer did a test on this. He did mention this before, however he said they upped the anti on the new head
Skerby
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Skerby 3/12/2021 8:02am
3/12/2021 8:02am Edited Date/Time 3/12/2021 12:22pm
Went trail riding with my cousin last night, he has a 20 yz250f. His bike starts briefly, dies, and never starts again.

Bike cranks good and occasionally would sputter, backfired a couple times trying to bump start. He has had this happen before and culprit was fouled plug.

Anyone know why he's foulin plugs? He runs pump non-ehtanol 91. I cant remember a single time in my life that a carb 4 stroke ever fouled a plug.
solved:
Figured out the stock mapping is a lil rich for trail riding
PJRAUS
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PJRAUS 3/12/2021 9:32am
3/12/2021 9:32am
navalseabee wrote:
Also interesting note, tried to swap my 2020 rear wheel on yesterday to run a sand tire, turns out the 2020 brake rotor is a touchy...
Also interesting note, tried to swap my 2020 rear wheel on yesterday to run a sand tire, turns out the 2020 brake rotor is a touchy bigger than the 2021 and doesn’t fit in the caliper.
yzf162 wrote:
Kind of odd i don't believe they changed the caliper or swingarm. You would think it would still fit.
navalseabee wrote:
That’s what I was 100% expecting. Maybe mine is just some sort of anomaly. Haven’t tried the front wheel yet. The 2020 rotors are different than...
That’s what I was 100% expecting. Maybe mine is just some sort of anomaly. Haven’t tried the front wheel yet. The 2020 rotors are different than the 2021. Full details, I used the 2020 wheel and spacers, 2021 axle, blocks and nuts.
Its the same setup as the 19 to 20 450. They went to a smaller rear rotor and counter sunk allen head bolts. You need the smaller rotor and a set of counter sunk bolts for your rear wheel.and you're good.. Your old front wheels should fit straight on
JBecker 72
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JBecker 72 3/12/2021 1:11pm
3/12/2021 1:11pm Edited Date/Time 3/12/2021 1:12pm
Skerby wrote:
Went trail riding with my cousin last night, he has a 20 yz250f. His bike starts briefly, dies, and never starts again. Bike cranks good and...
Went trail riding with my cousin last night, he has a 20 yz250f. His bike starts briefly, dies, and never starts again.

Bike cranks good and occasionally would sputter, backfired a couple times trying to bump start. He has had this happen before and culprit was fouled plug.

Anyone know why he's foulin plugs? He runs pump non-ehtanol 91. I cant remember a single time in my life that a carb 4 stroke ever fouled a plug.
solved:
Figured out the stock mapping is a lil rich for trail riding
My YZ426 would foul a plug every 30 or so hours. It never conked out on me, it just all of a sudden wouldn’t start. Otherwise ran pretty well. But that’s the only four stroke I’ve had foul a plug.

Glad you got it sorted out.
navalseabee
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navalseabee 3/14/2021 5:37am
3/14/2021 5:37am Edited Date/Time 3/14/2021 5:38am
Going to have some nice very low hour parts up for sale here this week once I uninstall them.

Rekluse Torque Drive manual: complete kit including basket; 4 hours of use.

Bill RE13 full exhaust

Williams Motowerx ported head and custom camshafts. Head is complete and ready to bolt on.
JBecker 72
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JBecker 72 3/14/2021 5:43am
3/14/2021 5:43am
navalseabee wrote:
Going to have some nice very low hour parts up for sale here this week once I uninstall them. Rekluse Torque Drive manual: complete kit including...
Going to have some nice very low hour parts up for sale here this week once I uninstall them.

Rekluse Torque Drive manual: complete kit including basket; 4 hours of use.

Bill RE13 full exhaust

Williams Motowerx ported head and custom camshafts. Head is complete and ready to bolt on.
Selling the bike?
navalseabee
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navalseabee 3/14/2021 9:36am
3/14/2021 9:36am
navalseabee wrote:
Going to have some nice very low hour parts up for sale here this week once I uninstall them. Rekluse Torque Drive manual: complete kit including...
Going to have some nice very low hour parts up for sale here this week once I uninstall them.

Rekluse Torque Drive manual: complete kit including basket; 4 hours of use.

Bill RE13 full exhaust

Williams Motowerx ported head and custom camshafts. Head is complete and ready to bolt on.
JBecker 72 wrote:
Selling the bike?
Yea, back to a 450.
Pirate421
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Pirate421 3/14/2021 5:36pm
3/14/2021 5:36pm
navalseabee wrote:
Yea, back to a 450.
What made you switch back if you don’t mind me asking? I’ve been looking at another 4 stroke at some point and a 250f has interested me. I’ve been strictly 250 two strokes forever with one 350 thrown in. Tried finding 350s and they are hard to find and almost 2
$2k more than a 250f.
navalseabee
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navalseabee 3/15/2021 2:15am
3/15/2021 2:15am
navalseabee wrote:
Yea, back to a 450.
Pirate421 wrote:
What made you switch back if you don’t mind me asking? I’ve been looking at another 4 stroke at some point and a 250f has interested...
What made you switch back if you don’t mind me asking? I’ve been looking at another 4 stroke at some point and a 250f has interested me. I’ve been strictly 250 two strokes forever with one 350 thrown in. Tried finding 350s and they are hard to find and almost 2
$2k more than a 250f.
Racing is why I switched back. Being in vet classes against 450s on a a 250 is a serious disadvantage. I thought maybe a fast motor would tip the scales enough to offset some, but there’s no comparing the two. I think the 250 is more fun to ride, so if you don’t race then go for it. I think if your skill lever is higher than your competitors most of the time you can make the little bike work, but if your on level with your competitors or just a tad under the 250 is tough.
3
sandtrack315
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sandtrack315 3/15/2021 5:44am
3/15/2021 5:44am
The sport would be more fun and safer if the vet class CC limit was set at 250. I get there a bigger dudes who like the power of a 450, but for competition, most older guys who ride and race for fun and aren’t over 180-190 should be on a 250.
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navalseabee
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navalseabee 3/15/2021 6:22am
3/15/2021 6:22am
sandtrack315 wrote:
The sport would be more fun and safer if the vet class CC limit was set at 250. I get there a bigger dudes who like...
The sport would be more fun and safer if the vet class CC limit was set at 250. I get there a bigger dudes who like the power of a 450, but for competition, most older guys who ride and race for fun and aren’t over 180-190 should be on a 250.
They currently have the freedom of choice now and most choose a 450, nothing is stopping them from buying a 250/350 yet they don't. From what I see even the practice only riders seem to choose the big bike most of the time.
2
Skerby
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Skerby 3/15/2021 6:38am
3/15/2021 6:38am
It's weird because I think a lot of us could run better laps later in the day on a 250f, but the 450s pull so damn hard out of corners, not to mention the roost and start.
1
Moto520
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Moto520 3/15/2021 7:47am
3/15/2021 7:47am
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the main line.....i got clobbered. I would go off the main line to make a pass and being on the 250F hampered my ability to switch lines and accelerate out of the deeper stuff. For stadium type tracks.....i prefer a 250F all day long.
5
sandtrack315
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sandtrack315 3/15/2021 12:51pm
3/15/2021 12:51pm
sandtrack315 wrote:
The sport would be more fun and safer if the vet class CC limit was set at 250. I get there a bigger dudes who like...
The sport would be more fun and safer if the vet class CC limit was set at 250. I get there a bigger dudes who like the power of a 450, but for competition, most older guys who ride and race for fun and aren’t over 180-190 should be on a 250.
navalseabee wrote:
They currently have the freedom of choice now and most choose a 450, nothing is stopping them from buying a 250/350 yet they don't. From what...
They currently have the freedom of choice now and most choose a 450, nothing is stopping them from buying a 250/350 yet they don't. From what I see even the practice only riders seem to choose the big bike most of the time.
Yeah for most I think it’s ego that’s stopping them.
1
navalseabee
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navalseabee 3/15/2021 5:30pm
3/15/2021 5:30pm
Moto520 wrote:
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the...
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the main line.....i got clobbered. I would go off the main line to make a pass and being on the 250F hampered my ability to switch lines and accelerate out of the deeper stuff. For stadium type tracks.....i prefer a 250F all day long.
This 100%, well said.
1
yak651
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yak651 3/15/2021 5:43pm
3/15/2021 5:43pm
Moto520 wrote:
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the...
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the main line.....i got clobbered. I would go off the main line to make a pass and being on the 250F hampered my ability to switch lines and accelerate out of the deeper stuff. For stadium type tracks.....i prefer a 250F all day long.
So did your results change when you went to the 450? I’ve found I beat the same people whether I’m on a 125 or 250f or 350sxf and the same people beat me. Think whatever you are more comfortable on is more important than bike HP, but then again our vet class turn out hasn’t been the greatest and the biggest gate I’ve been on in the last 10 years or so has been around 20 riders
navalseabee
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navalseabee 3/26/2021 9:12am
3/26/2021 9:12am
Full Rekluse torque drive clutch and Built head are in the Forsale section, or feel free to PM me.
yak651
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yak651 3/27/2021 5:06pm
3/27/2021 5:06pm
Sold my '19 today and dealer is holding a '21 for me that I will pick up this coming week - hope this leads to a good spring!
1
AH387
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AH387 3/27/2021 5:37pm
3/27/2021 5:37pm
yak651 wrote:
Sold my '19 today and dealer is holding a '21 for me that I will pick up this coming week - hope this leads to a...
Sold my '19 today and dealer is holding a '21 for me that I will pick up this coming week - hope this leads to a good spring!
Congrats. I sold my 350 a couple weeks ago and still don't know when my YZF will be in. It's brutal lol. But been riding the 125 in the meantime.
2
Moto520
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Moto520 3/27/2021 6:31pm
3/27/2021 6:31pm
Moto520 wrote:
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the...
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the main line.....i got clobbered. I would go off the main line to make a pass and being on the 250F hampered my ability to switch lines and accelerate out of the deeper stuff. For stadium type tracks.....i prefer a 250F all day long.
yak651 wrote:
So did your results change when you went to the 450? I’ve found I beat the same people whether I’m on a 125 or 250f or...
So did your results change when you went to the 450? I’ve found I beat the same people whether I’m on a 125 or 250f or 350sxf and the same people beat me. Think whatever you are more comfortable on is more important than bike HP, but then again our vet class turn out hasn’t been the greatest and the biggest gate I’ve been on in the last 10 years or so has been around 20 riders
I only raced the 250F at one “outdoor” style track. I did shitty so I switched back to my 450f and finished around where I always finish. I use the 250F for the stadium tracks only and for those tracks....the 450 is a disadvantage for me.
1
Leeham
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Leeham 3/27/2021 8:21pm
3/27/2021 8:21pm
Plugged in the Over Rev map in last weekend. I really liked it how it lessened a bit of the engine breaking and I could hold 3rd quite a bit longer. Lost a touch of bottom but still run 3rd through some tighter turns.
navalseabee
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navalseabee 3/28/2021 5:06am
3/28/2021 5:06am
Moto520 wrote:
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the...
I tried to race a 250F because my lap times were better on a practice day. Once the race started and i couldn't always use the main line.....i got clobbered. I would go off the main line to make a pass and being on the 250F hampered my ability to switch lines and accelerate out of the deeper stuff. For stadium type tracks.....i prefer a 250F all day long.
yak651 wrote:
So did your results change when you went to the 450? I’ve found I beat the same people whether I’m on a 125 or 250f or...
So did your results change when you went to the 450? I’ve found I beat the same people whether I’m on a 125 or 250f or 350sxf and the same people beat me. Think whatever you are more comfortable on is more important than bike HP, but then again our vet class turn out hasn’t been the greatest and the biggest gate I’ve been on in the last 10 years or so has been around 20 riders
So after two weekends of racing, yes they did.
1

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