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

Members Login
Post Info TOPIC: Fuelling Problems.


Newbie

Status: Offline
Posts: 4
Date:
Fuelling Problems.
Permalink  
 


HI I am experiencing some fuelling problems on my 02 ttr250r.

What happens is when going at about 100kms pr for a couple of km the bike runs out of fuel in  the carb, slows down and stops for a half min or so and it will fire up and run again. It does not do this at lower speeds. The same happens when pulling up a long hill or a shorter one two up.

Things that I have tried, Cleaned and set carb,drained and cleaned out the tank(plastic), including the petrol tap,put in a new plug,Replaced the rubber tube from the tank to the carb,Float hieght correct.

I am now at a loss has anyone had similar probs? any suggestions?

 

 



__________________


Super Guru

Status: Offline
Posts: 2532
Date:
Permalink  
 

Try looking at the tank filler cap - is the one way valve working OK?
When it next happens try unscrewing the tank cap and if you hear air intake then air is not replacing the used fuel!
Other than that - I don't know.
Martyn

__________________

You're never too old to learn something stupid

Budleigh Salterton. Devon



Super Guru

Status: Offline
Posts: 8056
Date:
Permalink  
 

I reckon Martyn has nailed the problem. Had exactly the same thing on a blue TTR - one-way valve clogged up not allowing air into the tank to replace the fuel being used.

Let us know how you get on please wink

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/ 



Newbie

Status: Offline
Posts: 4
Date:
Permalink  
 

Thanks but the breathing system is ok. cheers rog p,



__________________


Super Guru

Status: Offline
Posts: 8056
Date:
Permalink  
 

Shame - that would have been an easy fix!

Next thing to check is that the petrol runs freely out of the tap if you haven't already done that. Get a petrol proof container, take off the fuel line and run some petrol into the container to see if it flows freely.

If that's OK then the next step is not so easy. The filter above the float needle could be blocked. I have identified it in the pic below:

carb fiche showing filter.jpg

To get at it you need to remove the carb, float bowl and parts 11, 12 and 16. 

The float retaining pin 12 can be a pain to get out and you need to be careful not to break either of its support posts. It will only come out one way - see the arrow on the post.

It may be possible to check if the filter is clear by undoing the drain screw at the bottom of the float bowl and seeing if petrol flows freely when the tap is turned on - not forgetting to hook up the fuel line first! If it does then I don't think your problem is necessarily a fuelling one confuse

If fuel doesn't flow freely you probably need to check the filter cry

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/ 



Newbie

Status: Offline
Posts: 4
Date:
Permalink  
 

Ok thanks for the info Brian. Prior to your e mail I had the carb off again and found the said filter hiding in the fuel valve assembly.. this is not shown in the workshop manuel !! any way this filter was not too bad but had enough gunge in to foul up the flow at prolonged high revs so cleaned it out and its now ok. I will need a newfuel valve assembly as mine is also leaking past and flooding the carb but the fuel starvation problem is solved Thanks. Do you know where I can obtain a new fuel valve assembly? cheers for now rog p.



__________________
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.



Create your own FREE Forum
Report Abuse
Powered by ActiveBoard