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Discussion Starter #1
How much does the R3 have in common with the R25, besides more cc?
is the gear ratio the same?
rev limiter the same?
weight and construction (frame size, wheel base, suspension types and brakes) the same?
same parts as the other, and same gas tank size?

If so, can we expect about the same reliability?
If it's about the same as an R25, then the R3 isn't a new design, but an update.
 

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From my understanding they are identical with the exception of the larger pistons (8mm) in the R3 and the difference in redline 12500 vs 14000. Also different markets get different tires on the R25... I think the R3 is strictly the Street Pilot. They MAY have different suspension but I doubt it, they weigh nearly identical.

The sprocket gear ratios are the same... the individual gear (1-6) ratios are different between the R25/R3

Heres a good comparison from the Japanese Yamaha website.

Yamaha R25/R3 Japan
 

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Discussion Starter #3
If the gear ratio is the same, but the RPM limit is lower, and the cc's are higher; you'd end up with a bike that would be riding slower, yet has power left over at the redline.
That means that the bike would be way undergeared.


I mean, the R25 couldn't go to 14k rpm top speed, but hovered at around 12k RPM. With +50cc more, I can imagine it would be able to go to 13k RPM, but with a redline of 12k RPM, you'd be RPM limited, not performance limited; and a gear change could get you a faster top speed.


I also wonder if the clutch is the same.
On a lot of bikes I noticed when BBKs are installed, or when gear ratios are changed, that stock clutches start slipping; so I wonder if the clutch is updated as well.


Higher performance means higher weight, and a higher demand on suspension, and brakes, so I also wonder if those parts are the same as the R25.
If they are the same, then the braking should be worse than on the R25, since the bike is a bit heavier.


Just thinking out loud...


But the good thing is, if the bike is exactly the same, it should also be proven technology, and hopefully last.
Some other users have expressed their concern if this was a new bike, they wanted to wait until year 2, when the kinks where ironed out.
If the R3 is an R25 with bbk, there should be very little kinks to iron out....
 

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how about levers? anyone know if they work for both R25 and R3?? I need some adjustables
 

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Discussion Starter #7
Any bike I've ever owned, local dealers want to make money.
They don't sell you a 2014 model part for $40, no they sell you the stock 2008 for $60 (if you own a 2008 bike), even if it has exactly the same specs!
And an excuse that the 2008 parts are harder to get!

All dealers do this practice over here. Instead I find the part online, usually the same part for models 2004-2014 or so), for $20 (new aftermarket, or stock used)
 

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Discussion Starter #9
Seems like exactly the same bike, but with a bbk.
The 9LBS difference in weight might prove this.


If I understand it well, it's based on their 150 and 125 bikes sold in India and Indonesia.
 

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I would also like to know this! They seem to also have some rear sets for the r25 if they are they same fit is love to get them if not I can wait
I will probably just order them and see if they are the same. I will also be in Thailand in 3 days and might get a first hand view. will let you know!

That might be something a local dealer might be able to answer, worth the effort.
As much faith and positivity I like to have with professionals... I have none in most dealers here, only out to make a buck with little knowledge of the bikes. When I bought the R3 I knew more about them than the dealer...
 

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Evo-Tech has adjustable levers. Pricey, but they also fold which is good for racing.

http://www.evotech-performance.com/yzf-r3?cat=7775

I just ordered these CNC aluminum rearsets on eBay. They are the Area 22 models and are adjustable forward and down as well as backward and up. They are for sale from a Canadian seller for $199 but these were just $138 shipped. They will probably take a month or so to get here, but I'll report on them once they do and I've installed them.

http://www.ebay.com/itm/29141503248...49&var=590516724372&ssPageName=STRK:MEBIDX:IT
 

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Yep, here are the ratios compared. R3 has 2 overdrive gears, 5th and 6th. R25 has one, 6th only.

In all gears the R25 is geared lower than the R3 and would be able to pull harder compared directly against R3 in the same gear. Even with the lower HP, that should put the R25 close to the R3 in those gears on a Dyno run.

R3's gear ratios, per the owners manual (U.S. model, at least) are:

1st: 2.500(35/14)
2nd: 1.824(31/17)
3rd: 1.348(31/23)
4th: 1.087(25/23)
5th: 0.920(23/25)
6th: 0.800(24/30)

So 5th and 6th are both overdrive gears

YZF-R25 ratios

1st: 2.666 (40/15)
2nd: 1.882 (32/17)
3rd: 1.454 (32/22)
4th: 1.200 (30/25)
5th: 1.037 (28/27)
6th: 0.920 (22/25)

R25 also has a higher redline at 14,000 rpm
 

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A mate races an r25 in the Asian road racing championship,
they are pulling over 200kph.
 

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Can i bore up my r25 engine to r3 engine?. Since they are seemingly have the same kind of engine i mean the difference just the CC and the gear ratio and also they're look identical. If you ask why, it's because we in Indonesia just have r25 they don't sell any r3 for us even though indonesia are the one who made that bike. I wanna swap the engine by buying the r3 engine but it just gonna cost a lot cuz i have to buy it from india and then shipping it to my country and after that i have to pay a lot of taxes and then i cannot use my bike for the street because if i swap the engine my bike's gonna be illegal and cannot be registered and if i wanted like when i wanna pay the taxes i put the r25 engine back on it would be a lot of pain.
 

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The R3's 321cc engine, is a considerable step up from the R25's 250cc engine. That's a lot to be asking from any engine rework. Given your regional restrictions, why not just upgrade with the tools and parts available in your area, and try to enjoy the results. You may also want to consider what a full exhaust, free-flow air box/filter, and air-fuel controller or ECU re-flash will do for your R25 before going deeper into the engine. Good Luck.
 
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