YAMAHA DT 125 E SWISS
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Good evening everyone, I'm new to this forum my name is Dylan and I currently live in Switzerland, for 2 years I bought my bike or the DT 125 R (1991) of yamaha but I have a problem with it, the bike is currently mounting the group thermal 170cc athena New with less than 1'000km, athena firebox exhaust and 30mm mikuni carburetor (the carburetion of the bike is perfect, the spark plug is hazelnut brown) and everything else is original. Basically my problem is that my bike does not exceed 80km / h and I don't know why (the YPVS has already turned 180 degrees but ah just gave me more recovery and that's it) ... a guy on facebook says that mine motor (3ME) since it is Swiss and heavily restricted both mechanically and electronically and I honestly do not know where to put my hand ... someone who knows more and help me? ...
P.S If I have missed something, please ask
P.S.S This text was translated by google translator so sorry if there are mistakes but unfortunately english is not my mother tongue
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@DylanDT219 http://www.scrimsmustangclassicyamahadtrestoration.com/derestricting-the-yamaha-dt125r-1988-through-to-2007.html
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I thought the 91 models were pretty good.
You'd ideally want the powervalve servo operated, but spinning 180 degrees doesn't mean much to me. Where did you spin it 180 from.
My advice would be to follow the derestriction guide, either connect the valve up properly or pin it so it's flush with the exhaust port.
The easiest way to derestrict all of your restrictions would be to grab an aftermarket ignition system like the Zeeltronic. Your mechanical restrictions won't exist if you don't have the stock pipe and/or head. So it'll just be the CDI.
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@declan already seen and I don't need it since as I said my muffler has already been changed with a modified one
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@Calum I went to the Zeeltronic website but I did not find the model of my engine or 3ME but I also think I am the cdi because I read it on another forum -> '' ... since the Swiss had a limited 4HX CDI for the their market ... ''
P.S then for the 180 degree I found this info on some site and then I actually did it as I said it worked but not for the maximum speed which always remained at 80km / h
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@DylanDT219 You need to check the crankcase serial number, which for a 91, will most likely be a 4BL - 000
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@Darty mine is 3ME-0007 if you want i can send to you a photo
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@DylanDT219 don't focus on 180 degree stuff. Whip the exhaust off and make sure the powervalve is flush with the exhaust port when the valve opens fully. To test the top end you can pin it open and disconnect the valve.
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@Calum
okay let's say my valve is perfectly adjusted what should I do? change cdi? if so with which one? -
@DylanDT219 Make sure the inlet and exhaust tracts are free from restrictions. Ensure the linked above derestrictions are in place and make sure the engine is healthy.
Is the bike using stock gearing?
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@Calum maybe you still have not understood the sport exhaust and it is no longer original I have mounted ujna firebox athena in addition to this on the site we wrote that inlet before 1991 there are no restrictions and then I do not know if the gearbox is original since I have never opened the engine and then I do not think that there are modified changes for the dtr
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By restrictions mate, I mean blockages. Like is there leaves and dirt in the inlet tract. As well as exhaust. So yes it may be an aftermarket exhaust, but if it's blocked then that will cause poor performance.
And by stock gearing, I mean the front and rear sprockets.
Sorry for the confusion.
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‘Lost in translation’ springs to mind...
How long has your bike been stuck at 80kph? (60 mph is slow and wrong)
Was it faster before? Has it always been so since tha 170 Athena kit? Did it come as a 170? More history is needed...Hazelnut brown is too dark, no?. Should be ‘tan’ ideally?? Been a while since I’ve had my last stroke (2)
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Even if the fueling was slightly off it should be better than that. That said the Athena kit is a bit shite.
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@Calum
ahhh okay anyway stock gearing for dirt don't worry i checked and it's all clean -
@SpookDog my bike has always been blocked both with the original cylinder and with the 170cc it has always done less than 80 km / h. the 170cc arrived new from a german site with everything you need i still have the box ...
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If it’s the same with two different cylinders and exhausts it is obviously something else. Either the carb or ignition.
What does it max out at on revs?
Does it rev up smoothly? -
@SpookDog you rev up without problems, before I turned the YPVS by 180 ° it reached a maximum of 8 thousand rpm, but anyway this is the problem here someone has to tell me if they know any mechanical block so inside or outside the engine and electronically
