Dt 125r dyno
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@jonne123 The dyno doesnt seem accurate if it made 14hp with the exhaust, better head, reeds dont really increase hp numbers more feel and throttle response. But id say 14hp from that seems off. But like calum has been saying, you wont make competition dirtbike style numbers. They go 5 hours and then you change the oil, air filter and the piston is like every 40 hours. Like calum said the dtr is the opposite, its not meant to win you some dirtbike race rather made to be a reliable commuter bike that has the possibilty of going offroading.
However, first learn the difference between torque and horsepower, you can have a bike with loads of torque but not that much horsepower, or the otherway around.
Secondly learn twostrokes in general, how they work, how you tune them etc, theres literally an endless amount of stuff you can do to your bike if you have the skill and knowledge to do it, but you barely knew what calum meant by "tuning".Learn the basics first and stop fixating yourself on numbers and other bikes.
If high hp numbers is what u find important, then sell the dtr and get a yz or what calum mentioned above -
@Calum said in Dt 125r dyno:
https://www.ultimatespecs.com/motorcycles-specs/yamaha/yamaha-dt-125-r-2002
Maximum power - Output - Horsepower 14.10 HP (10.3 kW) @ 7000 RPM
Sorry to intervene but a bone stock DTR can and will make 23hp?
(I have a dyno printout to prove it but once again I’m on my phone and can’t upload it)
However and this is a BIG however... I honestly believe that there where only ever 2 models of DTR capable of producing that figure from factory and without modification.The legendary fast boi UK 89 model and the French 97-98 4BL that came with the rare 3nc-20 CDI. (however even this model came with a 3BN head so could be argued that its “restricted” or generally not reaching its full potential.)
Now I could be wrong, but every other model bike even regardless of area code that I’ve seen has had some kind of “restriction” or something that’s hinder its performance more then those other two bikes.
However, Callum’s right about quite a few things. Firstly, remind yourself what your machine was designed for, it’s a steep learning curve for some of us me. Your DTR, just like mine, was never designed to be sending triples whilst waving a Ronnie Mac flag mid air. It was however designed to be bullet proof, see 14k on a set of rings and be as happy taking you to the shops as it is with some hooligan on it popping wheelies and blasting through some woods. The moment you realise that is the moment you’ll gain a whole new level of appreciation for the very capable little deee teee arrrr.
Secondly another thing I had to learn is a two stroke is only ever as good as it’s last/current owner and with near enough all our bikes cracking on 20+ years old unless you’re lucky enough to own a very well preserved French bike or someone’s build you may as well just assume it has 15hp as you will never know what all of the bikes previous owners have done to it
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@jonne123
Yeah theyre apparently supposed to be really good, but why not just aim to have a fast bike with a good tune, it doesnt have to be on or the other, all the fast bikes wouldnt be fast bikes without a good tune, dont really understand your quote -
@Arild said in Dt 125r dyno:
@jonne123
Yeah theyre apparently supposed to be really good, but why not just aim to have a fast bike with a good tune, it doesnt have to be on or the other, all the fast bikes wouldnt be fast bikes without a good tune, dont really understand your quoteOr even better firstly rule out what it is that you wish to achieve when you say “fast”
Are we talking full on “wheelies every gear m8” or BARacing angry bicycle
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So the argument I have about that is my DTR probably doesn't make that sort of power.
Doesn't matter that it's not the "bad boy" French model since they aren't as tuned as mine. Fact of the matter is, they simply don't nake that much power without significant investment.
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Had this recently with someone telling me my TDR would be dog slow with its DTR cylinder and that his 4FU with 32mm would be a rocket ship. Person seemed unable to comprehend that I didnt really care that much and that its essentially a softly tuned fun / commuter bike that is designed to be reliable and run on basic maintenance only.
P codes, SP cylinders etc are all good if you have them, can afford them and are that bothered about getting 1 or 2 bhp out of a softly tuned Yamaha engine.
I've just sold 150bhp Ducati Multistrada so I'm not overly interested in 15 or 20 hp as long as the bike moves and is fun to ride
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No disrespect meant from the start! But I’m guessing that you’re about 17 and haven’t ridden a great deal of bikes?
Every 125 Has been restricted to about 12bhp since the late 80’s AFAIK. Any bike that is significantly above that has been de-restricted and/or tuned.
You can unrestricted early dtr’s by ‘pinning’ the power valve open. This will give you higher bhp but will basically make the throttle an on/off button with terrible response.
Later bikes I don’t know as much. You can unrestrict them and the variable power valve will still give you better low rev torque/response (I’m guessing that is what you mean by throttle response?)Do some reading up on deristricting your year model bike, then do some riding. Stop worrying about numbers bud, enjoy a wicked little bike for what it is, before yearning for more...
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@jonne123 said in Dt 125r dyno:
Yeah i know that its not a rocket ship. But i hope for little more throttle response and 1-3hp more
Thats a big increase for a 125
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@Calum said in Dt 125r dyno:
If I wanted to go silly fast I'd take my ZXR out for a spin
Building a 900 Monster this winter for fun at a lower pace
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@SpookDog I believe you could also show your License to Yamaha at time of purchase and they'd fit the YPVS for you. Hence why some came with the valves.
The latter models were restricted in other ways and probably came with the valves fitted for emmissions.
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I did wonder where all the 3 wire servo’s came from. I heard that a 1000 exup had the same servo. Thought that was a 4stroke though.
I love learning new shit!Did you mean the 5 wire were emission related? Dunno, I still think they are for improving bottom rev torque. Interesting though...
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Off topic. I saw the most beautiful bike ever. It was a Ducati with a ‘space frame’ of steel with about a 750-1000 v twin engine. 80’s looking. I never got a look at the numbers, never had any decals. Cafe racer, clip on looking dream boat!
I’d really love to find out what it was...
