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Post  swannie on Sat Feb 10 2018, 10:13

Good day

Im worried because of a funny sound when i turn my bike egnition on. I have a 2000 model thundercat and when i bought it, the sound was there but i read that its to warm up the bike so i always waited a few seconds before starting, but the sounds repetitions is faster now and doen not slow down and suddenly it stops but the bike wont start. Please i need advice.
My bike means alot to me. I love my cat
Please help?
My email is swannie467@gmail.com
My number is +27745433775
Thank you in advance
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Post  weasley on Sat Feb 10 2018, 14:42

You are probably referring to the fuel pump, which whirs for a couple of seconds when you turn the ignition on. The length of time it whirs for depends on how much remaining fuel is already in the fuel system; the longer you leave the bike, the longer it whirs (until it times out at around 5s IIRC).

If it is whirring a long time every time you turn it on, perhaps there is a fuel delivery issue somewhere? Just to check, there is fuel in the tank, right? And the fuel tap is open?
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Post  robertcains on Sat Feb 10 2018, 15:00

As Paul says above,
The fuel pump ticks very fast as it primes the carburettors, if it’s been stood for some time you may need to switch off the ignition & repeat, when the carburettors are fully primed the ticking will noticeably slow down before it’s ready to attempt to start the bike.
Both my Thundercat & Exup follow(ed) this process & can easily flood the bike if attempting to start the bike too soon.
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Post  bobh on Sat Feb 10 2018, 18:57

A blocked fuel filter might cause this.

There's also the known issue with old fuel, particularly supermarket 95-octane, leaving a deposit in the carbs when it evaporates, that can block up the jets.
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Post  yamahamad on Sun Feb 11 2018, 10:45

Possibly a kinked or collapsed fuel line?

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