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Author Topic: Project: YZ250R  (Read 21299 times)

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Offline citabjockey

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Project: YZ250R
« Reply #90 on: January 11, 2013, 05:59:19 PM »
I have read elsewhere that the apt carb will fill crankcase pronto with the bike on its side. Have you found this to be the case?

Bike looks great. Looking forwar to more test results. Is it being raced now?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Yamaha CT3, RT3, MX125, SC500, Toy Prius, Diesel F250 (it all balances out)

Offline oppenheimer77us

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Project: YZ250R
« Reply #91 on: January 11, 2013, 11:31:17 PM »
Sweet bike, seriously badass. Love the red/white/black color scheme.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TCI Performance

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Project: YZ250R
« Reply #92 on: January 14, 2013, 03:37:52 AM »
Quote from: citabjockey on January 12, 2013, 01:59:19 AM
I have read elsewhere that the apt carb will fill crankcase pronto with the bike on its side. Have you found this to be the case?

Bike looks great. Looking forwar to more test results. Is it being raced now?

So far we haven't had any problems with the carb filling up the crankcase and have only good things to report about the SmartCarb.

We had a few different riders take it for a first impression ride and they all felt the bike had very good power with great throttle response.

This week we will test the bike on the Dyno back to back against the stock PWK carb. This should confirm what we feel on the track so far.

A more detailed write up will follow after we complete the Dyno testing. The bike will be raced after we have the magazine tests behind us.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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Project: YZ250R
« Reply #93 on: January 14, 2013, 05:05:11 AM »
Quote from: TCI Performance on January 14, 2013, 11:37:52 AM
Quote from: citabjockey on January 12, 2013, 01:59:19 AM
I have read elsewhere that the apt carb will fill crankcase pronto with the bike on its side. Have you found this to be the case?

Bike looks great. Looking forwar to more test results. Is it being raced now?

So far we haven't had any problems with the carb filling up the crankcase and have only good things to report about the SmartCarb.

We had a few different riders take it for a first impression ride and they all felt the bike had very good power with great throttle response.

This week we will test the bike on the Dyno back to back against the stock PWK carb. This should confirm what we feel on the track so far.

A more detailed write up will follow after we complete the Dyno testing. The bike will be raced after we have the magazine tests behind us.

If you don't mind me asking, how much did the smart carb cost?

I can't wait for this thing to be finished. This is the motocross bike Yamaha should be making.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline citabjockey

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Project: YZ250R
« Reply #94 on: January 14, 2013, 02:54:53 PM »
SmartCarb makes pretty big assertions about their carb. If you are doing back to back runs with a PWK is it possible to work in a measure of fuel consumption at the same time? They assert more power with a wider spread but with less fuel. I am wondering just how much less?
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Yamaha CT3, RT3, MX125, SC500, Toy Prius, Diesel F250 (it all balances out)

Offline JRod4928

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Project: YZ250R
« Reply #95 on: January 14, 2013, 03:07:26 PM »
Beautiful Bike!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline ford832

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Project: YZ250R
« Reply #96 on: January 14, 2013, 03:13:36 PM »
Holy Crap that's a gorgeous bike  :o Can I have it?  ;)
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TCI Performance

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Project: YZ250R
« Reply #97 on: January 18, 2013, 04:19:37 PM »
Dyno Run Update

We have been testing the bike on the track the last couple of weeks and were noticing that the main difference between the stock carb and ATP SmartCarb was that we could keep the bike in gear longer.We felt that it would still pull hard when we would had to shift with the stock setup. Even though the stock carb comes on quicker we had absolutely no problem pulling out of the corners with a smooth power delivery which made it more like a 4-stroke type power but then pulled very strong up close to the 9K rpm range . Also we have noticed that we are using less fuel with the SmartCarb over stock. We haven't measured exact values as of yet but will in the next few test sessions.

The below Dyno run confirms what we felt.

PLEASE NOT THAT THIS DYNO RUN WAS NOT DONE TO SHOW HOW MUCH PEAK HP OR TORQUE THE ENGINE PRODUCES BUT RATHER THE PURE DIFFERENCE BETWEEN A PROPERLY TUNED STOCK AND ATP SMARTCARB BACK TO BACK WITH THE SAME BIKE SETUP.

Blue = 38mm SmartCarb
Red = Stock 38mm PWK



Thank you to Crower Performance for conducting the test for us.

In the next few weeks we will do more track testing to fine tune the suspension and have a few pro level as well as intermediate level riders give some feedback on the entire bike.

So far we have been very pleased with the bike and it is time to let independent guys and magazines test it for additional feedback.

We are planning on running the bike in a few selected races like the 2-Stroke Nationals and so on. 
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline TCI Performance

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« Reply #98 on: January 18, 2013, 04:47:32 PM »
Below is a link for some pictures from our photo shoot.

http://www.motovationsports.com/2013/01/18/tci-performance/

Thank you Steve Emter of Motovation Sports
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline twosmoke595

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Project: YZ250R
« Reply #99 on: January 18, 2013, 07:43:23 PM »
i wonder what a 40mm would do...

that's some decent numbers with just a carb swap
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline Stusmoke

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Project: YZ250R
« Reply #100 on: January 18, 2013, 09:39:57 PM »
I don't know about the "modern" YZ250s but my 01 250 is like a 250F +15 odd horsepower. Except it still maintains that hit, that rush and excitement. Not really my kind of powerband, but it just pulls and pulls and pulls until sign off. Its awesome. I remember most magazines, when conducting tests of the more recent YZ250s used to say how four stroke like the powerband is.

Thanks for the dyno information. I'll definitely be buying one :D
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline 2T Institute

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Project: YZ250R
« Reply #101 on: January 18, 2013, 09:50:25 PM »
Quote from: TCI Performance on January 19, 2013, 12:19:37 AM

Blue = 38mm SmartCarb
Red = Stock 38mm PWK





You have just swapped bottom end for top end. Some work on the PWK powerjet switching/ignition would match that over rev.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline ford832

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« Reply #102 on: January 18, 2013, 11:28:13 PM »
Great info,thanks for posting!.
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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Offline scotty dog

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Project: YZ250R
« Reply #103 on: January 19, 2013, 09:57:52 PM »
thats pretty awesome, i love that bike!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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F**K THE WHALES......................SAVE THE 2 STROKE!!!!

The hardest part about riding a 4 stroke is telling your parents your Gay!!

05 CR 250

Offline Watson777

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Project: YZ250R
« Reply #104 on: January 20, 2013, 02:28:29 AM »
Oh my god! Do you even understand how badly i want to ride that bike!!!! I would cry if I could afford to build that!
« Last Edit: December 31, 1969, 04:00:00 PM by ' »
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