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Really poor fuel economy

hawksquawks
hawksquawks
Squiddy
Squiddy

Posts : 18
Location : Hayle

Really poor fuel economy  Empty Really poor fuel economy

Post by hawksquawks on Tue 08 Oct 2019, 11:19 pm

Hello I have owned my CB500 for just over 2 years now, when I first got the bike, I was getting around 200 miles to the tank. The bike had some none standard exhaust on it Suzuki exhaust it seems. I replaced the exhaust with another aftermarket exhaust and saw a drop in fuel economy by 50 miles to the tank, I have since returned it to a stock exhaust and I have saw a drop to just 120 miles to a full tank ! I have lost 80 miles range, I would like to see if anyone can help me, many thanks
teamster1975
teamster1975
Admin
Admin

Posts : 2639
Location : Woking, Surrey

Really poor fuel economy  Empty Re: Really poor fuel economy

Post by teamster1975 on Wed 09 Oct 2019, 8:47 am

That's terrible economy! Are you sure you have no fuel leaks? Silly question but it's worth asking.
How do the spark plugs look?

These bikes are good for 240 miles to a tank if you brim them so there is something very wrong there.
trevor machine
trevor machine
the 900
the 900

Posts : 1326

Really poor fuel economy  Empty Re: Really poor fuel economy

Post by trevor machine on Wed 09 Oct 2019, 5:10 pm

How do you ride the bike? It might not be a consideration - but I'm asking regardless. Are you regularly revving it up to 10,000rpm? Or are you much gentler and keeping it down to around half that?

The reason I ask is because when I first got the bike I was a newly qualified rider and so used to be very conservative in the amount of power I used. However as I became more confident, competent and familiar with the bike, I used more and more of the engine - and I began to notice that fuel consumption increased markedly. I'm not saying it was as drastic as you're experience - but it was very obvious and quite considerable.
hawksquawks
hawksquawks
Squiddy
Squiddy

Posts : 18
Location : Hayle

Really poor fuel economy  Empty Re: Really poor fuel economy

Post by hawksquawks on Wed 09 Oct 2019, 7:17 pm

Generally I stick to the speed limit, and shift at around 6k RPM normally staying around 4k RPM at constant speed. I rarely go mad with my bike. I don't smell any fuel around my bike, But i will check for leaks
motofan
motofan
Four's a...something...
Four's a...something...

Posts : 161
Location : Normandie, France

Really poor fuel economy  Empty Re: Really poor fuel economy

Post by motofan on Thu 10 Oct 2019, 12:01 pm

Hi there! That's a rotten problem! How are your plugs? Are they black and sooty (what are you doing here?) they should be pale brown. If both are black then it could be a dirty air filter or non standard main jets installed to agree with the first exhaust but at odds with that which you have now indicating a need to revert to standard ones! Perhaps a renewal of all jets and check of slide needle heights and diaphragms would be beneficial.
Perhaps check compressions also?
If just one plug is black I would suspect that the appropriate main jet has fallen out!
Good luck with that scratch
trevor machine
trevor machine
the 900
the 900

Posts : 1326

Really poor fuel economy  Empty Re: Really poor fuel economy

Post by trevor machine on Fri 11 Oct 2019, 8:58 am

Obvious point but I'll make it anyway - do you keep your bike in a garage and if so, can you smell petrol more than usual? If you do, and you cannot - it seems unlikely that there is a leak anywhere. At least in my experience - as everyone knows, petrol has a strong, distinctive aroma. It does not take much of it before a confined space starts to smell of it. I had a small suzuki and there was the smallest of leaks around the carbs - really a tiny amount - but the garage was quite fumey. So this is one thing to consider.

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