Long term reliability of modern four strokes

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6/10/2018 3:22 PM
Edited Date/Time: 6/10/2018 3:26 PM

So everyone loves their shiny new bike and rightfully so.
My question is how are your modern bikes holding up 100, 200, 300 hrs later.
I’m getting off my 15’ 250xc and might be making the move to a 450 undecided on brand as of yet.
Anyone have a red flag I should be aware of.
And things like how the plastics hold up after a year or how hard it is to clean the hubs and cases of dirt stains matter to someone like me.
I’m a mid 30’s vet Xc and MX racer with many many weekends playing on fast sandy trails.
Any input is welcomed.

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6/10/2018 3:24 PM

Hundreds of hours with simple oil changes and air filter cleanings. Add a fuel sock for clean gas too.

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6/10/2018 3:28 PM

450's last forever. 250's not so much if you are often on the rev limiter.

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sponsored by zip tie, JB weld and peanut butter and jelly

6/10/2018 3:31 PM

I’m gonna be honest. I’m getting older and lazier. I have a 15’250xc and a 09’ yz250f and I’m not in the mood to rev anything anymore.

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6/10/2018 5:23 PM

^^^ Do we have to get off your lawn too haha... 450s can cope with beau coup hours and minimal maintenance.

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vomiting equals disqualification.

6/10/2018 6:25 PM

I've had a 450 with 140+ hours on it with just simple oil and filter changes

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6/14/2018 5:16 AM

2013 kx250f going in for its second top end and set of valves now at about 80 hours

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6/14/2018 5:41 AM

Far more reliable than any of the 2 strokes I’ve had. Regular oil and filter changes a 450 will last forever, 250f you’ll want to keep up on crank/rod hours.

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6/14/2018 5:59 AM

true story, my buddy has a 13 rmz with 430 hours. motors never been opened up

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6/14/2018 6:11 AM

My 09 kx450 has 150 hours on it at least. Bottom end is still original and its still good. Ive done a couple top ends since ive owned it and replaced the head/valves once. Still runs strong

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6/14/2018 7:13 AM

And yet there are many thinking the sport needs to go with smaller engines. Brilliant.

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

6/14/2018 7:34 AM

Johnny Depp wrote:

And yet there are many thinking the sport needs to go with smaller engines. Brilliant.

If you're defining the sport as Supercross, then yes.

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6/14/2018 7:47 AM

Johnny Depp wrote:

And yet there are many thinking the sport needs to go with smaller engines. Brilliant.

Ted722 wrote:

If you're defining the sport as Supercross, then yes.

There is no need to have engines with a short fuse if you want to slow down racing. Restrictors.

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

6/14/2018 7:48 AM

Johnny Depp wrote:

There is no need to have engines with a short fuse if you want to slow down racing. Restrictors.

Like a decent muffler....two birds one stone.

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6/14/2018 8:06 AM

Johnny Depp wrote:

And yet there are many thinking the sport needs to go with smaller engines. Brilliant.

Or a big motor that makes no power like harley does

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6/14/2018 8:17 AM

I’ve heard amazing stories of 200+ on KTM 450s. 200 on 350s and 150 on 250s. Top and bottom end.

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6/14/2018 8:34 AM

I know of multiple 16+ ktm 350s over 300 hours never being opened up. That’s impressive to me for any bike.

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6/14/2018 8:38 AM

Johnny Depp wrote:

And yet there are many thinking the sport needs to go with smaller engines. Brilliant.

Ted722 wrote:

If you're defining the sport as Supercross, then yes.

Johnny Depp wrote:

There is no need to have engines with a short fuse if you want to slow down racing. Restrictors.

Don’t we both have the MX-R on top of our short list? whistling

I’m with Hannah, that heavy cranked (rotating mass) boat anchor (450) doesn’t belong indoors. It’s more than just a restictor plate / power issue. But, my ultimate wish list is to get these young guys in the 250 class off the 5 year program sooner and into the premier class.

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6/14/2018 9:04 AM

my 09 yz450 has 130 hours, valves are still in spec, other than a couple spark plug changes nothing has been changed on the motor. Steering bearings been replaced 4 times, linkage bearings once, chain/sprockets multiple, exhaust header fractured, not sure from a rock or crash or what. It has been pretty reliable though, starts cold 1-3 kicks, hot 1-2.

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6/14/2018 9:21 AM

Solidkm wrote:

I know of multiple 16+ ktm 350s over 300 hours never being opened up. That’s impressive to me for any bike.

just gotta watch out for the frame breaking devil

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6/14/2018 9:22 AM

I know one person who races in Florida that has well over 350+ hours on KTM350s with nothing but oil changes and checking the valves. And he's no slouch in the woods. Granted, he isn't banging off the rev limiter, but the bigger bikes are about as reliable as you can get.

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6/14/2018 9:28 AM

just for conversation sake, how often to you 450 guys change your oil

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6/14/2018 9:57 AM

Ted722 wrote:

If you're defining the sport as Supercross, then yes.

Johnny Depp wrote:

There is no need to have engines with a short fuse if you want to slow down racing. Restrictors.

Ted722 wrote:

Don’t we both have the MX-R on top of our short list? whistling

I’m with Hannah, that heavy cranked (rotating mass) boat anchor (450) ...more

Yep, don't even try to open that can of worms trying to "handicap" E-bikessideways That would be about as futile as PED testing.

I understand the safety and moving younger riders up sooner issues that are somewhat related. IMO "handicapping" the bikes should not be for the best in the world. Let them and their teams decide what is the fastest way around the track. 450's and 250's and Alta's all run about the same speed anyway. Let them sort it out on the track and at the finish like. Bring back OPEN class. Thread derailed..

There are a few Beta's known on Thumpertalk over 400 hours. I wish I had that much time to ridecheerful

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

6/14/2018 10:04 AM

The modern 450's are like our Mini-Trail 50's back in the day....run forever...change oil/clean filter every 2-3 rides for me and put her away wet :-)
Really want '18 TC250 as only race vintage and 2t are just fun to ride to me. Get my wood these days from railing the perfect berm, which is few and far between. Luke SkyWalker days are in the rear view mirror for me. Can run faster/longer on my RMZ450 beyond a shadow of a doubt compared to smoker but at 55 just want to have fun. Too many guys in my age group getting maimed/killed on 450's imo as these new 450's are fire breathing monsters and with EFI ain't no bs'ing when you twist it you better be ready as that mother can get away from you real quick

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Kevin Windham‏ @kdub_14

Not 1factory racer hasnt been told that if ucan help teammate out, then do it 4 championship. Few r in a position like MM25 #partofthesport

6/14/2018 10:17 AM

fourfourone wrote:

just for conversation sake, how often to you 450 guys change your oil

Every 2-4 hours. Whenever its black

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6/14/2018 10:26 AM

fourfourone wrote:

just for conversation sake, how often to you 450 guys change your oil

I target 10 hours with a new filter every other time. Beta 4t's are unusual since they have a separate oil compartment for the engine and the transmission which keeps the transmission and clutch trash from fouling the engine oil. It still comes out transparent and I use Esther based expensive stuff.

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2015 Beta 500 RS, history: 99 KTM 300, 87 CR250, 84 KLR 600, 82 GPZ 550, 81 KX 250, 80 KX 250, 79 Montesa 414 VE, 78 250 VB, 77 360 VB, 76 360 VA, 75 YZ 125, 74 TM 125, 72 TS 125, 60's West Bend Go Boy Kart

6/14/2018 10:40 AM

fourfourone wrote:

just for conversation sake, how often to you 450 guys change your oil

Every 2-3 rides (3-5 hours). Filter every time.

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6/14/2018 11:10 AM

I had 215 hrs my 14 yz450. No issues whatsoever. Had the motor and trans gone thru just for good measure and piece of mind. 135hrs on it now and still runs flawless.

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6/14/2018 11:11 AM

And when they do finally let go...$$$$

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6/14/2018 11:11 AM

kb228 wrote:

My 09 kx450 has 150 hours on it at least. Bottom end is still original and its still good. Ive done a couple top ends since ...more

You claimed to do a piston every 10 hours...remember??

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Tomac and/or Anderson for 2020.....