YZ250F - what exhaust

JoelBOI984
Edited Date/Time 4/19/2013 4:22pm
Hey guys,

I have a 2012 yz250f that is completely stock at th e moment. I've had it since April last year and absolutely love it. I ride some track but mostly trails/hills with mates. The bike pulls hard through the gears but I have noticed that the bike doesn't seem to go anywhere in 5th. So, I'm thinking of getting a complete exhaust system that increases top speed. I'm thinking:

Yoshimura rs-4
Pro circuit ti-5
Fmf 4.1 RCT

What do you guys suggest and/recommend?

Also any suggestions on what sprocket sizes should I go for? I don't want to loose too much pick up.

Cheers,
Joel
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mxb2
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mxb2 1/22/2013 5:10am
1/22/2013 5:10am
My opinion would be for the yzf. Fmf rct megabomb. Or dr d then pro circuit akropovic. Leo vince. . Fmf and dr d have more r&d on the yamaha. Also add one or two teeth on rear sprocket. If you extra money remove the screen from.air filter cage or get a moto tassini air box. And even a better mod. A vortex igntion. Race fuel really helps 250f s. Like vp u4.4 or renegade sx or sx+. All great stuff and comes down to your budget. Mostly have fresh tires, bikes suspension set up for you. Just some ideas good luck.
JoelBOI984 1/22/2013 5:45am
1/22/2013 5:45am
Thanks mate.
After I get the exhaust system and sprockets, I'll def look into the moto tassinari air boot. I have looked into it before but was a bit sceptical

But with the sprockets what do u recommend for the front? Change teeth or leave it?.
mxb2
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mxb2 1/22/2013 6:15am
1/22/2013 6:15am Edited Date/Time 1/22/2013 6:21am
Front stock add one or two to the rear.it will help low and mid range power and with the full system. You will notice quite a bit of change for the good.but for more top speed you need a smaller rear sprocket.. whats the stock gearing on that bike?
JoelBOI984 1/23/2013 12:04am
1/23/2013 12:04am Edited Date/Time 1/23/2013 12:27am
Looking at the rear right now cuz I got a new tire put on it and its a 51. Not sure about the front but I think it's a 14.

I definitely would like the bike to have a bit more top speed for longer staights so I'm guessing take a few teeth off the rear but in saying that, wouldn't the full system fix that? So maybe go up a few teeth...

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mxb2
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mxb2 1/23/2013 5:47am
1/23/2013 5:47am
Count the teeth on the sprockets, some are marked, most japanese bikes come 13 up frt 48/48/50 on the rear the full pipe will help the overall power on the bike. The smaller the rear sprocket the higher top end you get, as in top speed. Imo 13/50 with that full system should be perfect.
JoelBOI984 1/23/2013 5:54am
1/23/2013 5:54am
Ok thanks for all the advice mate. I'll let use know the front size as soon as I can but the rear is definitely a sunstar 51.
mxb2
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mxb2 1/23/2013 10:13am
1/23/2013 10:13am
Cool good luck bro.
Wildside1
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Wildside1 4/19/2013 4:22pm
4/19/2013 4:22pm
We race a couple 2013 YAMAHA 250F's and have been on YAMAHA's since 2010. We have tried all the pipes you listed and this year we bolted a ROCKET Exhaust on my sons bike about two months ago and it is hands down the best exhaust we have ever used!

My son noticed a power increase the first lap on the new exhaust and the customer service is the best!

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