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938
Joined
12/14/2018
Location
IT
Edited Date/Time
11/30/2021 5:11pm
Hello,
During quarantine i’ve been thinking to my next bike.
Even tho i haven’t still put my legs over a sx250 (18/19/20) i’ve ridden a 2015 sx 250 and i liked it (engine/chassis side) except for the forks.
So, at the end of the year i’m probably going to buy this bike.
Any reviews, bad/good experiences?
How many hours does a top end last?
How many hours before a full rebuild?
I’m a top 5 B rider coming off a 2019 kxf 250
During quarantine i’ve been thinking to my next bike.
Even tho i haven’t still put my legs over a sx250 (18/19/20) i’ve ridden a 2015 sx 250 and i liked it (engine/chassis side) except for the forks.
So, at the end of the year i’m probably going to buy this bike.
Any reviews, bad/good experiences?
How many hours does a top end last?
How many hours before a full rebuild?
I’m a top 5 B rider coming off a 2019 kxf 250
OP, I have a '18 with a little over 70 hours on the stock top end. I'm keeping an eye on compression at this point, but there are a lot of people getting 100+ hours out of a stock top end.
Once the bike is jetted right and set up its a rocket. I've had no problems with it and I ride it hard. You can't go wrong with any of the '17+ bikes (if the '17 case has been upgraded for the kick start problem).
The Shop
Top end at 52 hours, shop said it was time, ring gap was at limit
I’m a 53-year-old shitty MX rider, But I am a revver, generally use only third , occasionally 4th on mx tracks
Most fun I’ve ever had on a bike
84 hours on top end and still fires up first kick with no performance loss. Haven't touched engine yet.
It's a good bike I wouldn't hesitate to buy it again or buy another one if the price is right.
It's a very fun bike but if racing is your priority I wouldn't recommend it. I would spend the extra 800 bucks and get a 250f.
Racing and fun is at 50% for me.
I like to win races but also to have fun.
The point is that i already have a kx250f and wanna switch to the 2smoke, which here in italy, is more expensive than the sxf250. It’s not a money problem.
Also gotta consider the 2smoke is less cheap, but i would do the top end in my garage, while on the 4 strokes i can barely change oil, lol!
When the lockdown ends a friend of mine is letting me rip his 2019 ktm sx 250.
Can’t wait this year to end so that i can change my actual bike. Lol
This chassis is amazing. I love everything about the way this bike works. Power is supreme. Total hours logged on this chassis is around 250. You won’t be disappointed.
My cousin got a 05 crf 450 and as navalseabee said, it’s a dinosaur of a 450, lol.
Can’t really wait to test the 250 sx.
Also, what % oil/gas are you running on this beasts?
And also which oils?
The guy who would let me try his 250 sx uses Motul 800, (3,5% here, 28:1 in american ratio i guess), his bike doesn’t smoke, and he lugs it, but 28:1 seems too much (but he is very fast, top 3 A Class)
Your opinions?
Also, i’m probably going to buy it new, and i think there are no 2018 leftover, so it’s going to be a 2019/2020.
Anyway we will see how this corona hits my wallet.
Good damn... 55:1 is really lean.
Technically thats a rich mix as its a higher fuel to oil ratio compared to the old 32:1 mix would be leaner because there is less fuel to burn.
Pit Row
Don’t quite get it.
Last question, do you buy fuel to the pump gas or do you use VP or that kinda stuff?
60:1 = 1,6 %
32:1 = 3,5 %
I guess i’m missing something in the transmission from x:x to %
My experience comes from tuning high hp turbo cars, so this is where I get muddy on tuning concepts behind a 2 stroke. Let's take for example a brand new bone stock 250sx with stock jetting. These bikes have rich jetting from the factory. From what I've read in magazine reviews and such, the bikes seem to run better with a higher premix ratio (60:1 being higher than 40:1 for example), which would make them more rich in terms of fuel. Why an already overly rich jetted bike runs better at a higher premix ratio, I cannot tell you for certain. Maybe better combustion of the air/fuel mix, maybe fewer misfires that the rider can't detect, I'm not certain but I am curious.
I don't want to derail this thread but I'm always down to geek out on tuning talk if you'd like to PM me.
Well said John!
I’ve run VP u4.4, T2, C12, and 90 octane ethanol free pump gas (what I’m currently running). The bike does make more power on u4.4 and T2 and it’s noticeable, but for normal riding C12 or pump works just fine.
I have a jetting thread on here with a good setup for the bikes with jetting specs for oxygenated race fuel and pump gas. I’ve already done a lot of homework and testing with all of the jetting and fuels and there are a lot of guys on here running it with zero issues.
I race a 2016 250xc with the forks from my 2012 150. The 2018 sx blows my bike out of the water. Front brake is unreal. A 250sx will probably be my next bike unless I can splurge another grand on the xc with the electric start for those less than ideal situations.
Edit: How could I forget the counter balancer!? It’s amazing.
Before, by say lean/rich, i wasn’t talking about jetting but the % of oil/fuel.
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