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bossmanjay

Joined:

Jun 10

Posts: 11

bossmanjay says:

Yamaha fazer fuel consumption

Help, the petrol consumption in my Fazer 1000 is terrible. The bike is fully serviced and runs well. I have checked everything from leaking fuel pipes to adjusting the exup to try to improve the mpg. However, I have noticed tiny cracks in the inlet manifold rubbers & wondered if this could be the cause??  Jim Vettrino

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  • Posted 4 years ago (11 September 2010 11:34)

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jaffa90

Joined:

Mar 09

Posts: 8890

jaffa90 says:

fuel

More info,year/mileage and has this problem occured whilst you`ve had the bike?Do you know the colour of the plugs when removed?Is the exup valve starting to turn at i think 4,000 rpm? Has it the correct sprockets on? If the inlet manifold rubbers are letting air in the mixture will be weaker,has the carbs been tampered with because of this? 

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bossmanjay

Joined:

Jun 10

Posts: 11

bossmanjay says:

Fazer Fuel

The bike is a 2002 model and only started using more fuel this year, March onwards. 26000 miles on the clock now. All bar 4000 have been done by me, mainly on European trips. The air filter & plugs have just been replaced although the old ones were a good light brown colour but worn. Sprockets are original and in good condition,(scottoiler) as is the chain. Carbs have not been altered and were balanced about a year ago. I haven't checked if the exup opens at 4000 rpm although it is operating as I can feel it when accelerating.

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jaffa90

Joined:

Mar 09

Posts: 8890

jaffa90 says:

fuel

Can only suggest checking if the exup valve is opening fully (service item),checking the throttle position sensor for working (correct ignition timing).Also has the valve clearances been checked (due at 25,000m).You would know if petrol was going down the carbs overflow pipes and out under the bike.:unsure:

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