A forum for owners of Yamaha TTR250 trail and enduro bikes!

Members Login
Username 
 
Password 
    Remember Me  
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Dies after a short "coshing"
Post Info TOPIC: Dies after a short "coshing"
tim1


Member

Status: Offline
Posts: 22
Date:
Dies after a short "coshing"
Permalink  
 

Hello folks,  I came across a yamaha workshop manual recently and noted the main jet size is listed as 137, mine has a 147 and an FMF powercore pipe, does this sound correct as I am diagnosing a dying issue after a short "coshing", starts again easily with a little choke (weak), the pilot screw was only 1/2 turn out and the float height a little high (7-9mm) these have both been sorted but I am lacking faith !
Any comments appreciated as i will be on the york moors this coming saturday


__________________
TTRfan


Super Guru

Status: Offline
Posts: 8565
Date:
Permalink  
 

Hi Tim and welcome to the forum handshake.gif

What year is your TTR?

Most of the UK "blue" TTRs have a 147/50 jet combination. Earlier models usually have a 142/48 combination.

When an engine dies like that it is usually when opening the throttle when the engine is still relatively cold and the choke is off making the mixture too weak to allow the revs to pick up.

Brian



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ!  

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 
tim1


Member

Status: Offline
Posts: 22
Date:
Permalink  
 

Yes it's a blue 04 model so that makes sense



__________________
tim1


Member

Status: Offline
Posts: 22
Date:
Permalink  
 

Definately not a cold running temp issue !!



__________________
TTRfan


Super Guru

Status: Offline
Posts: 8565
Date:
Permalink  
 

Check the petrol flows out freely when you open the float bowl drain valve to make sure no blockages in the petrol tap, petrol lines and float valve filter and make sure that the one-way air valve in the petrol cap is working. Easier to check the cap by blowing and sucking on the tube going into the cap though.

Brian



__________________

Exeter, Devon, UK

http://www.ttr250.com  - The one and only dedicated TTR250 FAQ!  

TIP: For easy viewing bookmark the "Recent Posts" view - http://ttr250.activeboard.com/p/recent/ 
tim1


Member

Status: Offline
Posts: 22
Date:
Permalink  
 

Checked the float valve filter whilst checking/cleaning jets-all fine, have inspected the fuel tap and the breather hose in the filler cap works OK.

I'll know more after the weekend, hopefully whatever it is/was has been cleared.



__________________
tim1


Member

Status: Offline
Posts: 22
Date:
Permalink  
 

IMG_20140426_111451.jpg

it ran like a dream and started every time first whiff of the button so that was adjusted float height and pilot jet ( I think that was the main thing), just wished I hadn't binned it in that big puddle.

Thanks for the advice

 

Tim



Attachments
__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> Dies after a short "coshing"


Create your own FREE Forum
Report Abuse 		Powered by ActiveBoard