Yz250f race build

Jersey283!
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Jersey283!
Looking to try and build my bike up I have a 17250f what all can you do to stock bike without porting/ bore kits to increase HP???? And still have reliability
Can you put pro Circuit camshafts and valves In with a stock piston? if so how do you think it will do I already have ti6 exhaust

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motox331
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motox331 9/17/2019 7:52am
9/17/2019 7:52am
You can run them with a stock piston however you will need to add the stiffer PC springs with those cams to keep reliability. The best bang for your buck besides suspension is to get your stock head ported. What type of racing and what class are you running?
Jersey283!
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Jersey283! 9/17/2019 8:33am
9/17/2019 8:33am
MX Just got out of c class this season so in B now. so would you suggest that or just port the head really I only ever kept it stock besides pipe just don’t know much about the fancy stuff yet
Also I have a 125 I want to keep 125 what would you recommend for that has pipe carb and reed now
motox331
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motox331 9/17/2019 8:45am
9/17/2019 8:45am
If you haven't done the suspension on both bikes I would do that first as well as buy new tires. Unless you are revving out the bike a ton I would keep the internals stock. you could always go with high compression pistons and porting on both bikes if you need more power. If you are racing locally for fun keep your bike reliable so you can keep racing safely.
Jersey283!
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Jersey283! 9/17/2019 10:03am
9/17/2019 10:03am
Thanks for the input, suspension is done on both bikes that was first thing I did as I’m 120lbs and 54
I’m most likely going to keep my 250f stock less I gain some more knowledge with the aftermarket stuff I ride it hard but not bad on it or bouncing off the limiter constantly and keep it maintained
As for my 125 definitely looking to get it ported or some more upgrades but I race that in 125 class so need to stay 125 but at end day it’s just a 125 and it’s fun regardless

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motox331
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motox331 9/18/2019 5:56am
9/18/2019 5:56am
Jersey283! wrote:
Thanks for the input, suspension is done on both bikes that was first thing I did as I’m 120lbs and 54 I’m most likely going to...
Thanks for the input, suspension is done on both bikes that was first thing I did as I’m 120lbs and 54
I’m most likely going to keep my 250f stock less I gain some more knowledge with the aftermarket stuff I ride it hard but not bad on it or bouncing off the limiter constantly and keep it maintained
As for my 125 definitely looking to get it ported or some more upgrades but I race that in 125 class so need to stay 125 but at end day it’s just a 125 and it’s fun regardless
If you can afford the race gas, add a high comp piston and head to the 125 and have it ported. should wake it up a bit. You need to remember that it is only a 125 so don't expect it to be more than it is at a stock bore size.

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