DT125R ARCHIVE

MDK wrote:

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hi and welcome

so the only derestriction you have done is the exhaust ???

is there a reed switch on that model ??? have you done any of the other derestrictions ? air box snorkl - carb or cdi changed for older ones ect ect ?


also get some pics up if possible with close up of engine - carb - cdi ect

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 Hey, Thanks for the reply mate! No the only de-restriction I have done to the bike is the exhaust.... I wasn't aware that there was more restrictions on the TDR?? whats the airbox & carb one?? Any other tricks to get it running right?? It's terrible that the bike is so slow.... feels as if I'm driving a 50cc!  I heard something about fully opening the power valve as well and earthing a wire from the CDI!?? are these good mods? I will get pictures as soon as my Dad will have a look at the bike for me (He is the mechanical brain ).

Really appreciate the help MDK!

Not sure if this helps any, but for the 2002 5ANC model, which I presume yours is, I can't find the jet size, but in the parts list I do have the part number for it, there are 3 different main jet part numbers , these being 137-14143-54-00, 137-14143-54-A1, and 4FU-14143-54-00, personally I'd plum for the last one as your cylinder is given as the 4FU nicosil plated type.

I'd go with the 270 myself, and do a plug chop, see how it runs with that in, what size is the Mikuni? 28mm?

Whoah lol, Black/Blue wire? not familiar with that mate, as for the powervalve do you have the servo connected to it or is it pinned open?

if the wire mod is the same principal as the tzr-r,then find the cdi wire plug and check the wires. the tzr was a green/black wire BUT.... it was the wire that went into the plug from the cdi,but didn't have a wire coming out of the other side of the plug. if that makes sense? if it has got a wire "missing" then thats the wire to earth. and defo one mod at a time lol 

looks like the one fella,same deal as a tzr just different colour. let us know how you get on with it 

Well a bit of an update!!

Myself and my Dad got around to having a look at the bike today.... first we took off the exhaust and found that the powervalve was actually the right way around! So we then grounded the black/ blue wire and took the snorkel off the airbox..... My god the difference is unbelievable!! only took it out for a quick blast there and had it up to 90km/h before i even shifted into 6th gear!! definitely an extra 20km/h added to the 110km max I was getting out of it! runs a lot smoother throughout the whole rev range now too! delighted! Looking forward to a proper spin on it now!!

Thanks for the help lads, and anyone with a TDR.... ground that fookin wire!!

Got 122km/h (judging by my Koso ) out of it on the way to college this morning and I could feel there was still a bit left in it!! My next dilemma is the expansion chamber.... have a guy on the other side of Dublin who said he'll gut it for me for 50euro! I've read great things about doing this, but would i be better off getting a performance pipe or what!?? I am very broke atm is the reason why I don't just go for a Gianelli/ DEP one now, and i doubt I'll have the money til the summer!

Also, will gutting the std one make it much louder??? Cuz as is with just the Micron end-can I have people covering their ears when I crank it open fully going past!

Thanks again guys!!

Thanks for the reply Seany! Yeah I'll be gutting the expanny... haven't the money for a new one unfortunately! I'm gunna wait until I've rebuilt the engine and ran it in before i do it though.... otherwise I'll be tempted to crank it as hard as possible to see the change it made on a freshly rebuilt engine!! haha!!