DT125R ARCHIVE

madrevs · DTR Senior Member

RE: fuse in back of speedo 2003 dtr

madrevs · DTR Senior Member

Checked the wiring out last night and the blue and red wire that goes from the clocks is connected tried pulling the fuse but made no difference

dread123 · Moderator

Looks like you'll have to replace that fuse with correct reed one.

madrevs · DTR Senior Member

Dont suppose u know where I can get one from other than yamaha

dread123 · Moderator

get yourself off to a breakers? or get emailing them? cant help mate- unless i come across one at my local

madrevs · DTR Senior Member

Ebay sell normal electrical ones on there for about 2 quid dont suppose u know if there all the same do u

dread123 · Moderator

no idea pal, i will try and find something to see if you can bypass easily enough- other than that go to yamaha and price it up..might not be that bad?

madrevs · DTR Senior Member

Thanku just spoke to yamaha and they didnt know what it was but are looking into it.trouble is without having one I cant match it up just tried local breakers and they didnt know what it was either lol

dread123 · Moderator

your gonna need someone with clocks for sale -1999-2003 modelikely to find l i think -you will find them situated in there. Ask around for broken clocks..likely to find then!

Calum122 · Guru

One man on here would definitely be able to help you.

http://www.scrimsmustangsclassicyamaharestorations.com/derestricting-the-yamaha-dt125r-1988-through-to-2007.html

Unfortunately he doesn't come on anymore. But his webpage has lots of information on it,

MDK · DTR Legend

wonder are these any good ?

http://www.ebay.co.uk/itm/Reed-Switch-Glass-N-O-Low-voltage-current-RS2S-1off-/251001241063?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item3a70d6fde7

http://www.ebay.co.uk/itm/Switch-Reed-Spdt-MDRR-DT-/281115356647?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item4173c7ede7

http://www.ebay.co.uk/itm/Reed-Switch-Spdt-MDRR-DT-25-30-/350806188307?pt=UK_BOI_Electrical_Components_Supplies_ET&hash=item51adada113

madrevs · DTR Senior Member

Hmm I dont know if they would work or not havent heard back from yamaha either. However I did quickly whip the powervalve cover and when the ignition is turned on it doesnt quite line up with the key way about 1/2 a cm out would this cause the same issue or does it not really matter.when I got the bike the exhaust side end cap was missing so made one out of a core plug till I can find oneits air tight but obviously not standard

MDK · DTR Legend

sure there is a guide some where on here for setting up the pv correctly .

beyond the reed switch thing are all other restrictions removed ? do you have a old cdi ect anything like that . I know I could find all this by reading your old posts but dont have the time lol .

tbh I had a mate that had a 03 bike he thought it was the dogs bollox next to my old purple one all clean and shiney and newish at the time but with in days he changed his mind as it would not break 55 mph no matter what he did the mopeds used to leave him standing ..

Calum122 · Guru

I spoke to the technician at Yamaha and he did say that there was some DT's that no matter what you did you just couldn't get any power out of them. They were just shocking,

You needed to change the carb, ignition and cylinder.

I believe he said it was early DTR's that ran the 3BN cylinder, 26mm carb and a restricted CDI.

madrevs · DTR Senior Member

So do u think its worth lining the powervalve back up then or just leaving it will it not being lined up affect the top end power.i did notice a few weeks ago that the noise it makes when hitting the powerband has changed.

madrevs · DTR Senior Member

I know sorry have posted quite a few questions lol its definitely led a hard life lol.its got dep system, standard cdi,air box snorkel removed, air box restriction removed off side and capped and obviously the fuse in speedo

madrevs · DTR Senior Member

All adjusted will take it for a spin tomoro and see if its made a difference. Is it usual for the left cable adjuster to be set alot further out than the right one.as thats the only way I could get the hole to line up

dread123 · Moderator

Mine are setup unequal.. To be honest you don't need to go changing cdi,etc etc.
Get the reed done,powervalve aligned correctly.snorkel removed, exhaust sorted and right jetting. You will then have a bike more than capable!! And that's speaking from experience! Mine pulls 80mph plus showing on vapor clocks. More than enough for commuting and green lanes. Although I have changed front sprockets too

madrevs · DTR Senior Member

After testing the bike today it still wont go past 60 its had both air box derestrictions powervalve lined up correctly new 240 main jet dep exhaust system and cant seem to get a reed switch.however have spoke to the old owner(old school friend) and hes assured me it used to alot quicker.the right hand powervalve cap came off and thats when the bike got slower.i then bought it and plugged the open hole with a core plug.its a airtight fit but only fits in tbe head about 5mm in.do you think this could cause an issue

madrevs · DTR Senior Member

After yamaha finally getting back to me today to tell me they dont know what it is.looks like im going to have to get another speedo with the loom am watching one on ebay with the switch but ideally want a broken speedo.does anyone know of any for sale as its only the loom I need with the switch.thanks

madrevs · DTR Senior Member

Speedo loom came today with reed switch so will be fitting that tonight.also got another powervalve cover to fit and thermostat.if only I had heating in the garage

madrevs · DTR Senior Member

Ok so here goes finally got a chance to test bike top speed today and it still wont break 60 mph.i have fitted new speedo loom with reed switch new rh side powervalve cover new spark plug new thermostat it will redline in 5th at 60 but then put into 6th and wont rev past 7.5k am at a bit of a loss now its fully derestricted and pulls really well up to 60 but wont go anymore.

Calum122 · Guru

Let me guess. Big one expansion chamber by any chance. (trying not to look at your photo)

madrevs · DTR Senior Member

Nah full dep exhaust no blows either also 240 main jet

Calum122 · Guru

Have you tried cleaning the air filter. What is the colour of the plug saying.

What sprockets have you got on?

madrevs · DTR Senior Member

Will try cleaning the air filter tonight and will also count the teeth on the sprocket.would the damaged mixture screw in the carb have any effect on the top end or is the mixture screw on carb just for controlling air/fuel mixture on idle

Calum122 · Guru

The air screw will only affect tick over and 1/8 throttle.

madrevs · DTR Senior Member

Rules that out then can I clean filter with water as thats all ive got at the moment idle does sticka little occasionally and sometimes cut out when ticking over but think thats due to the damaged mixture screw

Calum122 · Guru

Could be incorrect settings for your powervalve.

madrevs · DTR Senior Member

Did check and adjusted last week might try pinning it open by disconnecting electrics and putting a drill bit in the hole