Forum Corner
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You have to admire the Japanese tenacity, mainly there ascendency as an Industrial super power during the 1960s. They have pretty much just copied us folks in the Northern hemisphere for years, but yeah, they have made technology work for them, and subsequently the rest of the world.
Japan sacrificed alot to be a competitive world power, there products innovated the cheaper market, and they dominated for years. Still do I think.
Think the Germans pioneered the 2 cycle engine 30s to 1950s, used it for a bit.. Sachs built engines. Nice product made was the now quite famous Messerschmitt KR200. But euro cars and bikes dropped the 2stroke and it's design for the Japanese to lap up and invest into. And conquer massively.
Haha, Japanese technology all the way, certainly more willing to actually produce the wacky and no conformist solutions. Nissan's innovation history is epic tbf.
Japanese is quite hard, I'm just reading and writing it so far, It's simple, but broad with lots of modifying elements in speech and description. It's so different, it's refreshing and just pushes my curiosity.
Try it. Helps out watching all the Best Motoring - Hot Version and Option NSTC stuff
That Honda GP bike is beast. New discovery
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Yeah they are certainly easier to make, and slightly better road race performance.
Found this picture I took of my DT, 2 days after getting it on the road. Deep summer time in the woods, never been better.
The rust is now an issue on my bike. Think she will be sorned off this year and boxed up.
A full rebuild will take me a long time around studying. Got some new paint scheme ideas for it. And a special top end.
1989 YZWR 250 , Blue on White is dope. Seriously want to design my DT around this brute.
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Yamaha DT200R Swingarm! If you're not sure just compare the welds to the steel 125R version. It's legit.
Alloy part of the same dimensions as the steel DT125R version. Straight swap. saves some much needed Kg's.
Pricey as fuck, this can't go to waste, someone snatch it up and get building with it!
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@Calum , beg, borrow, steal and have both! haha. What were your plans for a Swingarm swap? I drew a blank over something wide enough for RS tread.
Got thinking about the KTM LC2 125 1991-1999?? They are elusive. European market.
Could of bought one of these when I was 17 looking for DT's, but I didn't know what they were at the time properly and was dubious about finding parts. Should of got one though!
That's my biggest gripe with the DT, A rubbish seat postion, height and reach if your over 6ft. I end up goon riding it and I look ridiculous. Haha such a hoot though.
The best thing about this bike is that it is indeed a KTM chassis with much better components ie, Suspension and Geometry, They are still pretty little, but has nicer cockpit area and feels much like a early 1990s SX/EXC does.
With a early DT125R based engine.. What a 125!
Look familiar ?
Not sure what size Dell'oto either. May of been 28s.
Can't find much on these LC2 Minarelli lumps.
Yeah and no, FMF never made pipes for this engine. I only ever gathered people mount SX/EXC aftermarket or OEM systems onto these, don't know why. Is there much benefit without a KTM barrel? Who knows, maybe the gas flow characteristics, Fluid dynamic mathematics cross over for a 3MB. Who knows.
If you study the KTM LC2 exhaust, it's very much just a re angled' DEP expansion design.
Interesting bike.
That could be an interesting pipe to try.
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(FAKE) YAMAHA TZR125RR 4DL Y-2 SP Cylinder
It's a shame,the real ones are really not just a 'straight swap' for your DT or other 4DL. Different crank,crankcase,powervalve,piston and cylinder head were used for the TZR125SP. Mega bike, the engines were really quite different to produce that magic 30+bhp.
A custom exhaust on this would be a must. These barrels are awesome.
Yamaha produced 500 SPs, around 150 went straight to the track and the rest were Street models. There can't be many unmolested versions left.
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Honestly, they are absolutely worthless!
The porting is no better than this:
http://mickabbeytuning.co.uk/Cyl4.jpglink no longer workshttp://mickabbeytuning.co.uk/Greg1.jpglink no longer worksThe only difference is these barrels are common as much. Cheap as chips. Further tunable.
Also I think you can bolt those belgardas barrels on unless I am mistaken. Or at least you can put a 3mb on a belgarda crankcase.
No those barrels are not worth it. It won't work unless you have the head and powervalve and I enquired about fabricating one and it's a no go.
Nice but way too overpriced. Should be bought and displayed in a museum.
Nice spot though
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@Calum Rotax engines are just better true. Have you ever ran a normal 3MB head on the 3MB-P barrel? The TZR4DL head had a different squish. I can't find one.
SP barrel not a straight swap unfortunately
The SP transfers are different, you could always modify a 4DL bottom end, but it's pointless without SP powervalve and crank. Not likely to find those at all. Need a complete SP engine. The 4DL-1, and 3 versions are the common lumps with standard internals and 3MB00-P top end.
It's a shame these Yamaha 125's really don't tune very well. Cant seek power with them.
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@Darty Is it though?
I used to think like that. When I say Aprilia rs125 to people they cringe. They were highly strung motors sold to teenagers. Fair enough the original purchaser looked after it. But once it trickled down in value they got a reputation of being nothing but unreliable.
Far from it in fact. Those bike took much more of a battering than many of bikes of its class. The only thing I will say about Aprilia are the electrics. That was their achiles heel.
Now Yammy on the other hand. They have their rip roaring two strokes. But they were never for road use. The Yamaha TZ series was a phenomenial bike that would run rings around many other bikes. But it was a track going bike only.
Even their Belgarda models were Italian made and not really Japanese. Nah the Japs sort power through reliabilty. As they did with most of their stuff. It isn't slow, but it isn't tear your arms out. Until you get to competition where reliability takes a bit of a dive.
Anyway the point stands. Yamaha did their thing and we have the DT. Other manufacturers did other stuff.
The belgarda is a gorgeous bike, but I liken it to the Aprilias and Cagivas of their day. I am told by Yamaha that even the SP barrel is Polinis work.
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@Calum Italian electrics suck. That is very true. Had some bad times with an old CH racing WXE50.
Aprilia's are largely trashed because there much racier, and without maintenance and mechanical sympathy they don't last. It's hard to say what is a better road bike in real terms.
Japanese can do both, just look at the Kawasaki KDX125SR version, Best of both worlds. I'd liken our DT projects to one of those KDXs in just a De-restricted spec. They are quick. Lightweight, and Kawaka build quality not to bad.
Yeah the Belgarda is pretty much Italian, the SP's were all assembled, and re-designed in Italy for racing.
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88-89 are the ones! Not even the best. Standard trim white on Red... It's thee DT125R to have.
Unfortunately the Seat is not original, the Head light decal is off an LC?
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@Darty I dunno man. There was always something about the 89 DT I just loved. I have the biggest head of anyone I know. My bike is the best this and that.
But hands down, my time again, it would be a 1989 dtr all over. I only have my dt because it was what was available 6 years ago lol.
Nice spot. Worth that price imo
