DT125R ARCHIVE

NEV wrote:

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lol cheers for your concern Miguel, but the 2.5mm overbore is pretty much run of the mill over here, and as long as you look after it by running it in properly, regular oil changes etc, it pretty much takes everything that you can throw at it, as for the 5mm overbore, well to be honest, if I see that Wossner makes a piston that size, and specifically for a DT, then obviously I'm going to have a go at fitting it into an engine, and seeing as how I've researched all the places to on how to engineer it, by replacing the liner for an alloy one then nicosil plating it, I'm going to do that, and if it all works and I get a 145cc bike that runs like Jack ****, then other people will obviously want to have a go, and do the same with their bikes, have a look at some of the other projects in here a couple of lads are doing at the minute, one lad is putting a 200 barrell onto a 125 bottom end, how crazy is that, but looking at what hes done, I reckon it's a goer, another lad is changing his swingarm and suspension from a bike you'd never think would go into a DT, but again hes having a go, if it works it works, if not then its just a case of changing to a different set up.
Cost wise I'm already quids in, as the price I paid for a Belgarda 4dl2 engine, plus 38mm Keihin carb, and barrell and head come to just over £100 pounds, you'll need to convert to Euros I know, but I reckon total cost will be about £375 to have the work done that I need doing, making it a total price of say £475-£490, about £50 pounds more than just buying a £440 quid 150cc kit from Germany, and remember I have the full stage 3 Belgarda engine, and a carb for £475, so like I say I'm on to a winner, providing it doesn't all blow up on me I know, but then again I could buy a 150cc kit from Germany and within 2-3 months have that blow up on me too, if say it was starved of 2t oil from the pump.

-- Edited by NEV on Monday 8th of October 2012 03:18:23 PM

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 But im not concern about the cc's you have, because the engine might run very good aswell. A friend of mine has a dtr 200cc cylinder, those from brasil, i dont know if you are familiar with it!! But you cant just take the cylinder and put it without changing nothing more. but he also needed other cranckshaft, some adjusts on the electrical, ypvs not working(locked), an exhaust made for that cylinder and crankshatf, it has a 38mm keihin too. 

the thing that im not understanding is that if your going to re design your cylinder to an allow liner and then nicasil on it, why not make it 56mm(standart measure) and then you.ll have a 125cc that runs as fast as the 145cc or more fast even!! You choose the measure of the cylinder right? Cc's are not everything, and i think that a 5mm oversize piston is to big and heavy for the original cranckshaft. But im thrilled to see that bike running. that engine has a lot of potencial. and it was a pretty good deal mate!!!! here they are very rare and expensive. 

im going to talk to you about many situations that happen here in portugal. are you familiar with big bore athena kit 170cc? here he have lots of that, and most people think that you just fit the kit and you'll have a 170cc bike that's overpowerful but that's not that simple!! you'll need to change some stuff to make that run like A 170CC. 

go to videos section, i posted there a vid, check it out :)