DT125R ARCHIVE

Members Login
Username 
 
Password 
    Remember Me  
DT125R Forum -> Tuning -> Athena 170cc kit, Help??
Post Info TOPIC: Athena 170cc kit, Help??
NorDt


Guru

Status: Offline
Posts: 877
Date:
Athena 170cc kit, Help??
Permalink  
 

Hey, Im from norway so please excuse my english if its bad,

 

I bough a 170cc cyllinder kit from athena just before the winter set in this year, But i cant get it to run cleanly, Im so upset, since i was expecting a big change, But actually, Its slower than it used to, This is my set up

 

Athena 170cc, Mikuni tm 34mm 250 jet( started out with 310 as people told me, But had to go down and down and down and down, And still on 250 jet its not running cleanly,) i have opened the air filtre box, So that it gets more air, And im using a gianelli performance exhaust, Now, My top speed is 120 kmh, wich is about 65-70 mph i think, And this sucks, Cause with just the performance exhaust it can do alot better.

 

At 120 km/h it almost feels the same way as when you have 130 km/h with everything original, The engine just wouldnt rev any higher.

So please, Please,Please,Please, If you have a 170cc athena cyllinder, And you made it run clean, Please tell me how, And do i need a Athena performance exhaust to make it perform any good, Or does the gianelli performance exhaust let out enough exhaust for the engine ?, 

 

Would a Dep exhaust do any better ?,

My acceleration is at best the same as original, I cant do wheelies because its not running clean, (Too much fuel ) And my top speed is rubbish.

Please help,

 

Im not on this forum alot, So i will be overjoyed if you answear me on email too, not just here, My email i gorannessan@hotmail.com



__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

does the front wheel come up ?

what have you done with the power valve?

try putting the original carb on for a test

what about the Reeds have you upgraded them

with the exhaust,most people in the uk like DEP

i have seen dtr with 185cc borekit with wr 200 fmf exhaust

 

but how many miles have you done since fitting the 170 cyliner?



__________________

 

 
fused420


DTR Senior Member

Status: Offline
Posts: 372
Date:
Permalink  
 

Have you done a plug chop?

__________________

1999 Honda Hornet 600 - Current

1998 Yamaha DT 125 R - SOLD
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

DOnt know what a plug chop is, But if it means checking the spark plug color i have, Its dark brown-black, Too much fuel, So its "Coffing" right before the kick comes in,

Yes the front wheel goes up, But just out of pure Torque, Bechus its coffing/ running unclean it goes down again right before the kick starts,

The power valve is at full opening i think, I had my dad to help while setting it up, And i was putting on the exhaust while he adjusted them, He told me he done them right.

Have original reeds,

Ive done 350 kilometers, Dont know what thats in miles, Im supposed to do 500 before reving it high, And thats no problem, Bechus the engine wont rev high,

I have a friend who has a dep exhaust, Maybe il borrow hes and test it out a day when the snow and ice is off the roads.

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

have you got any videos.?



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

No, i dont have any vids. And cant take anyone now either since its winter.

__________________

Sold the DT, Bought a WR 426. Sorry guys.
monfooldrop


DTR Member

Status: Offline
Posts: 19
Date:
Permalink  
 

i have the athena 170cc big bore kit fitted,running the standard upjetted carb and a full dep exhaust,it runs sweet,i have a bigger front sprocket to compensate the fact it would wheelie all the time,soooo much more torque than standard,not much diff in top end

__________________
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Thanks monfooldrop, What jet are you using ?, And have you done any modifications to give the engine more air?, Ill try what you said later.

And with the original front sprocket it wheelied easily ?, In what gears ?, Cuz with the standard cyllinder and gianelli exhaust mine wheelied in 1-2-3 gear.



__________________

Sold the DT, Bought a WR 426. Sorry guys.
monfooldrop


DTR Member

Status: Offline
Posts: 19
Date:
Permalink  
 

i have only took the snorkel off the airbox,i cant remember offhand the jet size,it would wheelie or spin when pulling away quick which aint good with knobblies on,i now have a 18 tooth cog on and its more controllable

__________________
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Whats knobblies ?, I kinda bought the 170 cc kit to do wheelies easily, So im gonna keep my front spocket i guess,

I guess ill figure out the jet size myself, Atm i have these sizes : 220,250,260,270,280,290,310

__________________

Sold the DT, Bought a WR 426. Sorry guys.
monfooldrop


DTR Member

Status: Offline
Posts: 19
Date:
Permalink  
 

knobblies are off road type tyres,it is a 310 jet i used,hope you get it sorted

__________________
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Thanks alot :), I cant wait to test it out, So in what gears did it wheelie if you tried ?

Could you get it up in all the gears ?

__________________

Sold the DT, Bought a WR 426. Sorry guys.
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

This guy i have been talking to from norway with this setup : Athena 170 cc, Dep exhaust, Standard carb with 290 jet claims he cant do any more than 65-70 mph, 120 km/h. Wich is the same as i, Anyone know what may be causing this ?

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

probably because its a trailbike, wr450 only go 85mph really, not very stable at high speeds. also the dt needs a bigger carb and bigger reed block  and airbox cut open, the 170 kit has very similar porting to the standard one, or get this biggrinhttp://www.ebay.co.uk/itm/160692193433?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Well, this other guy here wrote that his dt is doing fine with 28 mm carb with bigger jets, and dep exhaust,

I have this set : Gianelli exhaust, 34mm carb 250 jet, Open air filtre box to give it more air.

Still mine doesent do more than 120 km/h, wich i think is like 70 mph.

This is much slower than with only gianelli exhaust and bigger jets on the standard cyllinder, With that setup i did 140 kmh, Wich i think is about 90-100 mph

__________________

Sold the DT, Bought a WR 426. Sorry guys.
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 


Mine isnt running clean right before the kick starts in, it gets too much fuel, Do you guys think that may affect my top speed ?, Doesent seem like its running unsmoothly at 120 kmh, It just doesent want any more rpm

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

to much fuel will make the spark plug wet and have a weak spark, try using an ngk BR8EIX, also the dt200r has the tm28ss carb same as the dt125r but with different jetting, you might want to copy the jetting for the pilot jet,

or everything

jet needle

needle jet

slide cutaway

main and pilot jet

also run 99 octance fuel!!!smile

 



__________________

 

 
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

http://www.megazip.ru/ru/bike/yamaha/view/443/13616/164333



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

is that a 28mm carb ?,

I am using a ngk brp 10 i think, 9 or 10, Once on my standard cyllinder i sieced the cyllinder right after switching to a brp 8, So i want to be safe and use a 10 plug,

My plug isnt wet, But its almost black, Would i have to replace everything in the carb ?, isnt it enough to just change the main jet, and maybe the idle jet ?,

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

yes its a 28mm carb, main jet, pilot,would be best to change. the needle, and needle jet might be the same as the 125 



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Ok, But what do you think about my theory about the 34 mm being to big, and therefore giving the engine too much of both air and fuel, and thats the reason why it wont do high rpm ?

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

if the mixture is correct it will run fine, bigger carbs does not always mean more power, is the carb tilted? because they need to be level



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

I dont think its tilted, Bechaus then it wouldnt be like this would it ?, It would be more like almost out of fuel all the time ?,

You know how the engine gets all weird the seccond before its out of fuel xD

__________________

Sold the DT, Bought a WR 426. Sorry guys.
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

Dont think it is, Then it wouldnt be like this i think, It would be more like almost out of fuel, You know how weird the engine gets right before its out of fuel xD

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

i would try, putting the original 28mm carb on, with the same main jet and pilot as the DT200



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

And what jet is that ?, and what is pilot ?, im not very good at the english names for the parts ^^

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

this web site http://www.megazip.ru/ru/bike/yamaha/view/443/13616/164333

 

main jet 150# which is in the old mikuni sizes eg 1.5mm

pilot jet 25#



__________________

 

 
NorDt


Guru

Status: Offline
Posts: 877
Date:
Permalink  
 

What would those sizes be at todays size numbers ?, i dont have any more pilot jets, other than the one that is in the 34mm carb, But i have alot of main jets

__________________

Sold the DT, Bought a WR 426. Sorry guys.
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

haven't a clue, email mikuni? or buy a jet and drill it with a 1.5mm drill,

 



__________________

 

 
the only way is YAMAHA DTR


Guru

Status: Offline
Posts: 1290
Date:
Permalink  
 

but you have cut open the air box so you will have to run it richer



__________________

 

 
1 2  >  Last»  | Page of 2  sorted by
 
Quick Reply

Please log in to post quick replies.
DT125R Forum -> Tuning -> Athena 170cc kit, Help??
Tweet this page Post to Digg Post to Del.icio.us


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard