DT125R ARCHIVE

slob · Guru

RE: The rebuild... The Supermoto 4T conversion...

CarlosRexx · Guru

You'll bet bored of it. I've been on a wr125 and sounded lovely but when I pined it, it didnt go anywhere. Which is disappointing really seeing as it would be a great bike if It was faster. Saying that the bikes yours to do what you like to. It'll still be a very good looking bike :)

FunkeyMunkeyDavid · Guru

not my choice but its not my bike lol will be different for sure....save the dt lump to put in an xt at a later date.....

Nathlaad · DTR Legend

Just like to point out 4T isnt as reliable as people say, mines blown up twice and ive got under 10 on the clock! but im good at blowing bikes up

DT200R MACCA · BANNED

least you can say you have the slowest dt going confuse

-- Edited by DT200R MACCA on Tuesday 15th of January 2013 10:44:45 PM

Calum122 · Guru

Mate forget the 4t engine. It's completely pointless and will ruin the bike. For the money you can get a perfectly fine DT engine. Looks much nicer as well since you get the massive expansion pipe.

NathanH · DTR Senior Member

Too late chaps... Just been to pick it up! Engine, full loom, ecu and clocks. Engine has done just over 3000 miles all for a bargin price of £250.

eG x LoGiKzZ · Guru

wow that was a bargain! i think its a great idea, will definitely be one of a kind!

NathanH · DTR Senior Member

:)

DT-R_bradders · Guru

what about the overall height of the engine?? remember the dt lump doesnt have an extra chunk on top for the valves and cam!!! and the carb sits alot lower down on the dt engine as its inducted thru the crank case, gonna be one hell of a ball ache dude ; )

will defo be interesting to see how this goes tho m8y

-- Edited by DT-R_bradders on Wednesday 16th of January 2013 11:44:01 PM

BigPhil · DTR Senior Member

A well maintained dt engine with a correctly set up carb should be fine for reliability.. But each to their own fair play should be an interesting project ! :)

CarlosRexx · Guru

What are the mounting points like? Roughly the same or isn't a serious weld new mounts job?

eG x LoGiKzZ · Guru

doesnt look like it bolts through the swingarm (got a dark monitor cant see) so that could be a problem? i dont think any mounting points will line up

NathanH · DTR Senior Member

Top mount looks similar but the bottom will require a bit of fabrication. It doesnt mount between the swing arm like the dt.

NathanH · DTR Senior Member

B al reet lol

DT-R_bradders · Guru

have you got a complete dt engine you can stand next to it to have a rough comparison, jus think that the dt frame wont allow for anything much bigger , other 2t yea but 4t engines are so much taller, might find yourself cutting parts of the frame away to squeeze it in, but that would weaken the frame so much, might have to cut the cradle off and extend it downwards so not to compromise structural integrity.. my brains gone crazy thinking about this lol!

tunertom · DTR Senior Member

no offence mate and i dont mean to put you down.. but.. i dont think that engine will go in and i also think that if you get it in there, you will have spent more time and money than it is worth and you could of just bought a bike similar to a dt but with a 4t engine in it and customised it to your liking for alot less effort and money with it being more reliable and having a much higher re-sale value to boot.

i have done engine transplants in the past and although sometimes the result is a nice one, i always have regretted it because of the sheer time and money they take and when you come to sell you only get pence for it

just a thought... before you go ahead chopping and welding

Calum122 · Guru

Personally I would use that engine for another project. Like a shifter cart or summit. Stick to the DT engine for the DT. Or get your hands on a rd engine lmao!

NathanH · DTR Senior Member

Cheers cal. Not much in it.

-- Edited by NathanH on Thursday 17th of January 2013 06:05:16 PM

the only way is YAMAHA DTR · Guru

It's nice to experiment, bit why get. A 125 4stroke? My mate had a rieju with that engine with a bigbore 150-80 cant remember but my dt killed it in race

NathanH · DTR Senior Member

Pretty much the only reason why I went for a 4t 125 was fuel ecconomy and the reliablity factor. Im not bothered about speed. Aslong as it'll do 65-70mp im happy. Dont get me wrong the DT is a great engine but it doesnt suit what I want from the bike. It really is all show and not much go. At the end of the day its always going to be a 125cc bike.

Calum122 · Guru

NathanH wrote:
Pretty much the only reason why I went for a 4t 125 was fuel ecconomy and the reliablity factor. Im not bothered about speed. Aslong as it'll do 65-70mp im happy. Dont get me wrong the DT is a great engine but it doesnt suit what I want from the bike. It really is all show and not much go. At the end of the day its always going to be a 125cc bike.

I'm sold. That is a good answer. That's fair enough. The fuel economy on the DT is excellent. But do you know what Is even better... A four stroke. That's fair enough. For me the 125 class is good on fuel. I want as much power/reliability as possible. The DT meets that need. They can take an absolute battering. Especially the restricted models. The DT engine is capable of revving up to 12k rpm. The re struggles to reach 10. Therefore you can't rag it. It's protectin the engine. So reliability is increased. The only thing you gain from that extra 2k rpm is top end. If you're not interested in top end then it doesn't matter you still get the power lower down the rpm. The power out of the 4t 125 is pathetic. But like has already been said its what you want out of your bike. To me it would be a lot easier to get the wr125. The styling is sweet on those bikes. Fuels amazing on the 4t 125. But reliability shouldn't be an issue. If you maintain and look after your bike it'll see you for a long time. And if you're capable of building a bike from scratch then you are more than capable of a rebuilding a simple 2 stroke engine every 30k miles. Top end every 12. I have been keeping a close eye on this thread. And will continue so cause it sounds like its going to be a lot of interesting work.

DT-R_bradders · Guru

**** me there aint much difference in size is there! lol well ill keep my mouth shut and fcuk off then lol

looking at it it shouldnt be that difficult to do then jus custom mounts n jobs a goodn
as for the fuel pump u might be able to squeeze it in where there fuel tap goes in the tank, cut n weld a flange to fit the pump on there, only half decent flat section on the tank, got a pic of the fuel pump for it? how do they mount normally?

exhaust port location might be a tricky one still?

-- Edited by DT-R_bradders on Thursday 17th of January 2013 10:31:21 PM

eG x LoGiKzZ · Guru

they are suprisingly similar, does the wr bolt through the swingarm? if it doesnt what will you do about that?

AndyYam · Guru

As much as I think you are Crazeee mofo, good luck with it lol. An interesting one to say the least! Each to their own though.

NathanH · DTR Senior Member

In all honesty, I dont know. Next will be to offer it up to the frame and see whats what. Going to have to buy an external fuel pump (wr has an in tank pump) but got to find out what presure the injector needs first. Going to get wr switches too for ease.

Nathlaad · DTR Legend

If it doesnt fit, set fire to it then it will fit i guarantee it!

NathanH · DTR Senior Member

Width comparison. Dt engine is missing the flywheel cover but the 4t is slightly thinner.

NathanH · DTR Senior Member

Lol. May have to notch the frame for the exhaust. Ill also run the exhaust where the standard zorst goes. The fuel pump in the wr is designed for a flat bottomed tank so not enough room in the dt tank. An external pump is the only way, just got to find one that fits the bill.

NathanH · DTR Senior Member

Been doing some research, fuel pump needs to be capable of 36psi. So Im going to use the wr pump and sender assembly but i'll have to heavily modify it to fit in the dt tank. Also by using the sender i'll get a fuel level reading on the clocks.