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DT125R Forum -> Tuning -> Misfiring
Post Info TOPIC: Misfiring
dtr200691


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Misfiring
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Have 03 dtr done al derestriction bt stil slow wil nly do 65 on a gud day seems to misfire alot in high revs n strugles av tried 2 new plugs n pt brand new cap on sum1 said it cud b ht lead so went out in dark gt it warm n rev it looking under tank there was no flash frm ht lead or coil bt wear the plug screws into head a blue ring glows the more I rev ive bin to 3 bike garages n thev al said theyve never herd of that so am prety stumpd ani ideas lads?

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NORFE


DTR Trusted Engine Builder

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wtf a blue ring glows?????

compression

ignition 

fuel

check all those to manual spec

never herd or a glowing blue ring

 

glowing red ring yes my arse on a monday after vindaloo sundy biggrin



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NORFE


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check all connections of the wiring for loose or corroded fittings, coil tight on frame.

earth point intack not frayed and been disturbed on high speed runs from vibration

partially bloked jets causing fuel starvation

whats the blug colour like?

when was top end done?

have you tried a new coil

most bikes coils will fit it you have a mates to try



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dtr200691


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Av cleand coil conextions al gud its lyk tha coils findin earth frew spark plug on to head aint it al hav try new coil a fink

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STUPOT-7


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RE: Misfiring ???
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HI I,m new to the forum and was hoping some one can help think i`ve misfire ???

dtr 03 full dep, reeds ect done!

had bike 6 months and has been running great (would) will do 75 plus up untill saturday just gone checked as much as poss had carb off stripped and cleaned put it back together ran fine 5 miles ride out it started to play up again only revs to 6000 then seems to miss fire ??? still ridable but not up to scratch just feel a bit stupid riding it as every time i get to 6000 it starts missing cry

no again tonight i went out on bike ran fine once again after 3-5 miles  then started playing up again any ideas plz

Cheers Stewart



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NORFE


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RE: Misfiring
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have u tried a new spark plug in it 1st my old cr sm used to eat plugsno



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MDK


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THINK THE MAIN PROBLEM IS YOU BOUGHT O3 BIKES OR ANY AFTER 1999 LOL . SORRY IT HAS TO BE SAID THAT any dtr after 1999 is slow eu restricted snails

what de restricting have you guys done ? if any

.
ps
back to the original post .

[bt wear the plug screws into head a blue ring glows] how you mean a blue ring glows ? do you mean you kinda see the blue spark around the plug ?
http://www.youtube.com/watch?v=XgzHsDBAwdE
is it a good tight fit or is there play in any way where it screws in ? sounds silly but have seen yung uns try other plugs in bikes that was to large and made the hole a little bit bigger or bad threads ?

is your plug screwd all the way in . if a thread is damaged lower down it may seem tight but not realy be all the way in [so you will see the blue flash on out part of head]
pls dont try extream force to make sure its all way down . a good visual check should do to confirm this



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DTR125CO-1.jpg


de restrictions

good clean up of a old batterd  dtr  95

 
STUPOT-7


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Out on bike seems to be running fine fingers crossed

Thanks Guru

Cheers Stewart

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NORFE


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what did u do to it ? biggrin



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dtr200691


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Ye plugs fits nicely no play n gos all the way in. Al try new coil at weekend fink tht should sort it


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dtr200691


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Fink ur right bout the age tbh on a gud day myn wil nly do 55-60 on flat took reedswitch out n tapd it behind light done intake manifold strip n ful dep what else could b restricting other than cdi


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NORFE


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we will have a play at weekend mate, get it in me office lol

and have a good look at her see whats needed on her perscription biggrin



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dtr200691


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Haha yes mate sounds gud. My boss offerd me 2 stage 4 nitros kits that he had on his fzr genisis bt dnt fink itd do myn much good lol

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NORFE


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RIIIIIIIIING DING  DING CRUNCH BANG.......UNHAPPY HA disbelief

 

 

 

thats all im sayinsmile



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Calum122


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I don't know why your bikes are so ****. My bike does an indicated 80mph + on flat! It is also still restricted! Pulls nicely in every gear. Only problem now is that it is losing power.

I'm not lying honestly my bike seems to be alright. Nothing compared to my RS but 55-60 is just shocking. When I change into 6th i'm doing 60mph. From there I can scream another 20mph out of it. I'm not one to brag about these things.

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MDK


DTR Legend

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what years yours calum ?

I know from past I have owned almost every dtr year made {just not the red -gray} and most did 75-80 easy as standard . know loads of lads who have riden with or who have owned any dtr after 1999 and they all ride like yamaha sr 125.s lol and scream to get a good 65 downhill ..

I did have a great pdf on full derestricting that had all the standard tips in but some others I never heard of ?

I know one said there was  a dummy bulb/reed switch  hidden in the clocks that was linked to the cdi ?  that registerd when the bike was hitting to mush speed it bogged it down and slowed the bike ????? { may be bs }

some good info here

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



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DTR125CO-1.jpg


de restrictions

good clean up of a old batterd  dtr  95

 
fused420


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Main jet to big maybe?

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STUPOT-7


DTR Newbie

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HI, New plug coil lead suppressor cap and bingo all seems ok smile  I,m guna change coil as well i,ve one orderd should be with me for this w-ends ride out (bike sat in garage stripped down once again waiting for coil biggrin) 

 

Thanks for your responce great help!

when i get the jist off putting photos on forum confuse i will post some pics of  bikes my mates also has a dt 02 model

Cheers Stewart



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NEV


Guru

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Hope you havent ordered one of those coils from Cardiff Motorcycles, coz if you have it wont fit, and you'll need to send it back,theres a few in here been caught by them recently.

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