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The TTR250 FAQ web pages -> TTR250 -> Repairs and maintenance -> fuel consumption/ Carburettor
Post Info TOPIC: fuel consumption/ Carburettor
pantheman


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fuel consumption/ Carburettor
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Is it normal for my TTR to have an increased consumption due to the wear out needle / main nozzle???

 

I think so , I just would like to confirm it



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Cubber


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RE: fuel condumption/ Carbureator
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It's got to be so, hasn't it? confuseconfuse

When the needle gets worn it narrows the diameter = more fuel getting through. cry

When the jet gets worn it widens the hole = more fuel getting through. cry

The effects will be compensated by the rider's right hand because the wear takes place over many miles.

It wil be noticed in your pocket each time you fill up though. biggrin

Martyn



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East Budleigh. Devon
pantheman


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Do you think its wise to order new needle ,main nozzle and probably the pilot screw (from Boats.net) given the fact that its a 1993 model or is it better to ditch it and search for something else.
If so what would you sugest as an affordable solution? Any peticular second hand carb from a similar bike, what could fit?

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Cubber


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Ahhh - the twenty million dollar question. confuse

The answer is possibly YES. wink
Then agian, the answer is possibly NO. disbelief

It depends on many things:-

  • Can you afford to do it?
  • Is the bike worth it, being how it's nine years old?
  • Will it make the bike a much better bike?
  • Would it be better to flog this bike as it is and put the money to a better bike?
  • Could you possibly find a better, standard carburettor?

Only you can honestly answer these questions. blankstare

If it belonged to me I would seriously think about checking everything else on the bike, like ignition timing, spark plug, plug lead, carburettor settings - the easily checkable bits - first.

If these didn't improve things then I would see if I could borrow a substitute carburettor from a friend just to see if it works better. If it did then try substituting bits from it like jet, needle, slide and things to see which work better on mine.

Having sussed it out then I would be in a position to decide whether to buy new, buy seconfd hand or sell what I had for a better bike.

Your call............... ??????????

Martyn



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East Budleigh. Devon
BM Steve


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RE: fuel consumption/ Carburettor
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Just in case any are interested, my bike is stock standard and with a full tank the other day I got 176klm on the main tank, got home, started it the next day and it ran out of fuel in about 30 seconds, good timing   biggrin

most of the riding was averaging around 40kph, up to 90 on the tar and down to a crawl through the singles

Great range I think smile



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2004 TTR250 - Highway Dirtbike Hand Guards, 38mm Bar Risers, D606 Front & Rear, Opened up Airbox with Twin Air Filter, Re-jetted Carby, B+B Bash Plate & Frame Guards, DIY 3mm Alloy Tail Tidy, 14/47 Gearing.

 
pantheman


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thats about 4liters per 100km . Its what Yamaha claims for the TTR . I have to fix my carbno



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BM Steve


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pantheman wrote:

Is it normal for my TTR to have an increased consumption due to the wear out needle / main nozzle???

 

I think so , I just would like to confirm it

 I was wondering what fuel consumption you are getting, I'm averaging around 20k's per litre.

I would seriously check the things Cubber pointed out first, at a minimun get a new spark plug and check the timing

How does your bike start ?, mine starts from cold with choke instantly, runs and then 30 seconds turn off the choke

Does it idle OK, does it run smooth, does it die or flood when you hit the gas, any hesitation streight off from idle

As far as I can tell the carbs are pretty reliable, if it's worn out there may be other things worn as well

Don't forget to check  the float height as well, this stuff is all in the workshop manual Ask Matt Here

Good Luck

 



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2004 TTR250 - Highway Dirtbike Hand Guards, 38mm Bar Risers, D606 Front & Rear, Opened up Airbox with Twin Air Filter, Re-jetted Carby, B+B Bash Plate & Frame Guards, DIY 3mm Alloy Tail Tidy, 14/47 Gearing.

 
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