YZ250F big bore kit?

joemoto883
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joemoto883
Edited Date/Time 12/24/2015 8:47pm
Anyone running a '14 or '15 yz250f with a big bore? I race +25b and +30b and would like a little more power for starts. I've seen both 269cc and 290cc kits available and was wondering if anyone has any experience with either?
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joemoto883
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joemoto883 12/21/2015 3:24pm
12/21/2015 3:24pm
Thanks for the link, a lot of good info. Also making me rethink my build as I have no access to a dyno and it's not really in the budget anyway. Was hoping to keep the motor build under $1500. Anything more than that and I will just sell my bike and buy a 450. Lol. Just for my curiosity sake, about how much do you have invested in the motor? (Not including the magura clutch )
davbrucas
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davbrucas 12/22/2015 7:48am
12/22/2015 7:48am
GYTR head $1700
DCR cams $900
Genius TB $1500
Vortex ign $750
FMF exhaust $900
Hinson clutch $900
Twin Air intake $225
GYTR airboot $100
RPM big bore $700
Tuning $500

I've spent over $9k in mods. Lol.
joemoto883
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joemoto883 12/22/2015 9:32pm
12/22/2015 9:32pm
Yeah, that is well outside my budget. Loops lIke an awe some build for sure! I'm leaning twords the cylinders works 269 kit and a set of stage 2 hot cams. Already have the twin air intake, full fmf pipe and brand new clutch. I was mostly wondering if the GYTR tuner will do what I need or if I need to go to a vortex or Tokyo mods ignition set up.

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davbrucas
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davbrucas 12/23/2015 6:47am
12/23/2015 6:47am
With my setup it wouldn't idle at all and the GYTR tuner doesn't allow adjustments below 3k rpm.
RNagy052
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RNagy052 12/23/2015 9:45am
12/23/2015 9:45am
davbrucas wrote:
GYTR head $1700 DCR cams $900 Genius TB $1500 Vortex ign $750 FMF exhaust $900 Hinson clutch $900 Twin Air intake $225 GYTR airboot $100 RPM...
GYTR head $1700
DCR cams $900
Genius TB $1500
Vortex ign $750
FMF exhaust $900
Hinson clutch $900
Twin Air intake $225
GYTR airboot $100
RPM big bore $700
Tuning $500

I've spent over $9k in mods. Lol.
The GYTR head comes with GYTR cams, curious as to why you replaced them. Did the power delivery not work well with the big bore? Could have you adjusted for that using different Mappings with the GYTR tuner?
davbrucas
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davbrucas 12/23/2015 4:20pm
12/23/2015 4:20pm
RNagy052 wrote:
The GYTR head comes with GYTR cams, curious as to why you replaced them. Did the power delivery not work well with the big bore? Could...
The GYTR head comes with GYTR cams, curious as to why you replaced them. Did the power delivery not work well with the big bore? Could have you adjusted for that using different Mappings with the GYTR tuner?
The GYTR exhaust cam is the same as the stock cam. I had heard really good things about the DCR intake cam so I bought it.
Jack_Wagon
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Jack_Wagon 12/24/2015 3:46pm
12/24/2015 3:46pm Edited Date/Time 12/24/2015 3:48pm
I have a set of DCr S3 cams I'll trade for a set of stock ones and $300. I'm selling my bike. I have a set of stock cams with no sprockets I'll throw in too. Text me if interested (404)966-8614
Jterry
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Jterry 12/24/2015 4:01pm
12/24/2015 4:01pm
You need to just call Derrick Harris at HP Bikes tell him what you want to spend and let him go over options with you.
joemoto883
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joemoto883 12/24/2015 7:54pm
12/24/2015 7:54pm
I was only going this route because the shop that helps me out is willing to give me parts at dealer cost. I will be doing all the wrenching myself, but I should be well under $750 for the cylinder works kit and the set of stage 2 hot cams. I just ordered the gytr tuner (wanted that anyway). As well as the gytr intake boot, interested to see what that looks like. Anyone know of a place I can dyno the bike in the Albany, NY area?
joemoto883
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joemoto883 12/24/2015 7:56pm
12/24/2015 7:56pm
Jterry wrote:
You need to just call Derrick Harris at HP Bikes tell him what you want to spend and let him go over options with you.
Contact info? Website?
Jterry
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Jterry 12/24/2015 8:02pm
12/24/2015 8:02pm
Derrick Harris
1-210-882-0330

His website just recently got taken down for some reason. He said he just woke up one morning and it was down. Just give him a call. I've used him multiple times and he's really good with Yamaha's.
davbrucas
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davbrucas 12/24/2015 8:24pm
12/24/2015 8:24pm
Jterry wrote:
Derrick Harris 1-210-882-0330 His website just recently got taken down for some reason. He said he just woke up one morning and it was down. Just...
Derrick Harris
1-210-882-0330

His website just recently got taken down for some reason. He said he just woke up one morning and it was down. Just give him a call. I've used him multiple times and he's really good with Yamaha's.
Ditto. He tuned my bike yz and will be building my KTM.
Jterry
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Jterry 12/24/2015 8:47pm
12/24/2015 8:47pm
He ported my yz250 cylinder, and did the suspension, mapping and intake cam on my 350. I now have a 16 yz450 and when need something like that for it I'll use him.

I'm about to buy a yz250 with a eg295 kit to ride in the woods. I'll probably let him port it how he likes when it needs a rebuild.

He's also ported other friends yz 2 strokes and they love them. I've talked to him many times on the phone for long periods of time. He's a good dude.

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