DT125R ARCHIVE

apexer0 · DTR Member

confused

r0bsk1 · DTR Senior Member

Are you sure they're different? Where abouts does it differ?

apexer0 · DTR Member

dtrnet says cross cables over if you do this the valve does indeed turn anti-clock but when engine is running valve is fully open at idle and close at high rpm manual says oppersite??

91civic_VT · DTR Respected Member

No on th early bikes as soon as you start the bike it closes the valve (anti-clockwise) and opens up (clockwise) when it get to 6000rpm or so.

The cables do cross on the early bike.

apexer0 · DTR Member

well i can safley say that i have tried it and it ran worse than it already is this is wot i have done
changed carb 28 flat slide(other as cracked)
main 190
pilot 22.5
needle on 5th clip
standard filter and air box
big one spany /tail
3wire servo set up to manual
standard gearing on c&s
rebored to 57mm

power band dont kick in till 7500 way to late and wont pull past 6thou in 4th/5th and still quite gutless through out

i have never had an engine give me so much tropuble setting up although it has been 20yrs since i played with a 2-stroke

r0bsk1 · DTR Senior Member

Its normal for the powerband no to kick in till about 7000 rpm.

-- Edited by r0bsk1 at 10:58, 2007-06-23

jasedtr · DTR Respected Member

i think the standard flatside carb jet is 210,got two and both hav 210

91civic_VT · DTR Respected Member

apexer0 wrote:

big one spany /tail

power band dont kick in till 7500 way to late and wont pull past 6thou in 4th/5th and still quite gutless through out

This could be where your problem is.

Big One Expansion pipe? The one that comes straight off the head and gets rid of the twisty part of the standard pipe yeah?

I have just replaced my one of these for the same reason, no power below 8000rpm even with the servo.

There is a another post where we discussed it (titled powervalve, i think)

Here is the thread http://www.activeboard.com/forum.spark?forumID=66365&p=3&topicID=12230588

Here are pics of the two pipes, you can cleary see the difference in design.

-- Edited by 91civic_VT at 14:24, 2007-06-23

apexer0 · DTR Member

jasedtr wrote:

i think the standard flatside carb jet is 210,got two and both hav 210

i have tried every jet from 240 down to 150 and the 190 is where it runs best

91civic_VT · DTR Respected Member

Have you tried putting the standard pipe back on?

apexer0 · DTR Member

91civic_VT wrote:

Have you tried putting the standard pipe back on?

i would if i had one header was rotted out on other so i binned it

apexer0 · DTR Member

any thoughts on this pipe
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&ih=010&sspagename=STRK%3AMEWA%3AIT&viewitem=&item=200113552500&rd=1&rd=1

91civic_VT · DTR Respected Member

Doesn't look much better to me...but you never know.

apexer0 · DTR Member

it does at least have a header