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this is a bike my size
A 230 is not a "full sized bike" in my opinion. They are smaller than a 250/125 2t, and also smaller than a 250F/450F 4t as well. I know this since I have a YZ125 and it is taller and slightly wider than my buddy who owned a CRF230F at the time. His bike out weighed mine, but mine was bigger otherwise. Do not think a 230 is a good measuring stick.
Also, bear in mind that from all accounts concerning stock/factory spec., a YZ125 is the tallest bike in seat height out there. I have a buddy who is 5'6" tall and he has to tip toe my YZ125 sagged out for my 5'10" son, who flat foots the bike. So, the truth is this, you are going to have to resag the bike a good deal for you to ride a 125 2t in a controlled and comfortable manner.
According to what you have said, you are 5'2"-5'3" and 95-100 lbs., which also tells me you are going to have to have the bike's suspension set up far more that the usual rider. Not to piss you off, but I doubt you are going to fit a 125 2t in a comfortable manner for at least another ice cream summer or two, and this is with it sagged and set right. So, forget the idea that you need power to ride. You need skill to ride.
My buddy, who is 5'6" tall, can take a 100-105cc 2t bike and keep up with me on my 300 XC-W easily. Granted, he is 5'6" and about 130 lbs., and I am 6'2"+ and 200-210lbs., but my 300 has far more power and torque. However, he knows how to ride and can work a bike right, so he keeps up without issue. He also took a CRF230F and outdid a 450 EXC, and kept up with my 300. So, he took a bike that makes 20 RWHP, tops, and kept up with a bike that makes close to 50 RWHP and out worked a bike that makes 46+/- RWHP.
Power means nothing to the right rider. In my opinion, your best bet is to get an 85-105cc 2t and work it for a couple of years. The bike will fit you better and will work out far better in the long run when you are able to get a 125 2t/250F 4t bike. Plus, you will smoke lesser riders around you as well, even if they are riding bigger bikes that make more power.
Experience + Ability > Power.
Here is the main issue with you being on a 125 2t bike.
You weigh roughly 100 lbs. and a 125 will weight roughly 200 lbs. wet (fuel and oil). Now, add in that it will make around 32-35 RWHP and you are riding something you cannot control or handle due to your height and weight. Couple this with the fact you do not have the strength to ride it right, you are asking for trouble.
My son, who is 16 years old, 5'10", and roughly 135 lbs. still has issues with my/his YZ125. he wrecks far more than I do and on a scale of 5 to 1, and I am riding a much more powerful bike. Not that my son is better or stronger than you, but let's face it. He has two years of growth and strength, and he has issues riding a bike that just fits him. I have spent around $165 on parts from wrecks on my 300 XC-W, and in that same time we have spent a total of about $500 on parts for the YZ125 due to his inability to fully control the bike, and he has been riding close to two years now. Not to mention his hospital and doctor visits for everything from scrapes to a broken collarbone.
Now, if yu do get it, you are going to seriously "weaken" the suspension of the bike due to its initial set up from the factory. The front and rear spring rate is going to be far too stiff for your weight to actually make it work, and you are going to have to set the sag to where the spring is far less compressed for you to sit on it, which esentially makes the bike taller, and since you do not weigh but approx. 100 lbs, you are not going to really compress the spring rate of the rear shock at all. You just made the bike taller than factory spec. if I had to bet on the matter.
Then you are going to have to spend money on not only lessening the spring rates as the spring rates of factory are set for more weight than you current weigh, which will be several hundred for the new springs alone not counting having it done for you, but also having to spend money on having a seat shaved. Since you have no idea how to properly revalve and respring a suspension and will have to either take the bike to a shop or send the suspension off, and you have no idea how to shave a seat, you are looking at approx. cost of...
$110: front suspension springs
$150: rear spring
$350: revalve and respring
$275: rear suspension
$100: seat work
Total: $985 + tax
You may find the prices are close to right, or more. I did my own front suspension for the YZ125, and after adding $150 of "works" parts, actual part replacements, and tools I needed, I was out just under $400. The bike is now set up perfect for my son on spring rate (front and rear) as the springs did not need to be replaced, and again, he is bigger and stronger than you, but he still has issues with the bike. Sadly, he is really too tall for anything smaller.
Lastly, if you are used to a 150 4t, saying you want more power than an 85-105cc 2t will provide is truly asinine. You are used to power derived from torque (twisting force), which is different from power derived from top end (horsepower). There is a reason that 150 4t bikes ae allowed to race against 85 2t bikes, as they are generally the same in ratio offsets from RWHP to torque, but the way in which each produce power and send it to the rear wheel is different in many ways. This will equate to how you ride the bike being different and also in how youcontrol that power as it is sent to the ground.
This may piss you off, but I would rather see you pissed off and a better rider with less injuries, but you obviouly do not know what you are talking about and have not looked into the matter fully to understand what I or anyone else has said to you here. Simply put, you are looking at spending thousands of dollars on a bike and work to make it fit you when you should fit the bike. You have a 150 4t, so learn to ride it right and quit thinking you need a bigger bike, because you do not. Simple as that. You don't. You have given nothing but reasons as to why you do not need a bigger bike and none for why you do. Get teh experience and ability, and size to your frame and body, and then move up as you need to. That is the truth. Think about it. I am 6'2"+ and well over 200 lbs. before I eat lunch, and I did not need anything thatn a 125 2t until I relearned how to ride. The only reason I can control a 125 2t bike is due to me being a full grown man, and it can easily get away from me if I let it, and I am double your size. So, you still think you can handle a 125 2t? I truly think not. Learn to ride what you have and you will thank us later, even if I pissed you off now.
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