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tzr idle speed rises when fuel tap is turned off (running)

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simon1221
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Joined: 28 Jul 2004
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PostPosted: 22:03 - 24 Dec 2004    Post subject: tzr idle speed rises when fuel tap is turned off (running) Reply with quote
this is a bit confusing, but not a problem:

i just turned the fuel tap off on my tzr while it is running to see what effect it would have (obviously it would stop) but what i didnt expect is that right at the end, the idle speed rises to about 4 - 5000 rpm, then stops

its not that it bothers me as i am not going to switch it off while riding, just curious - possibly running more lean for a last 10 seconds or so?


any real explanation?

cheers
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conpants
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PostPosted: 22:05 - 24 Dec 2004    Post subject: Reply with quote
my af1 does the same, i guess its a good way of knowing your out of fuel...
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gsxrboy
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Joined: 29 Jun 2004
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PostPosted: 22:17 - 24 Dec 2004    Post subject: Reply with quote
Its to do with the mixture of fuel / air, when you have turned the fuel off right at end it will run lean this in turn increases the revs.

Kickstart any more info? Very Happy
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Kickstart
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Joined: 04 Feb 2002
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PostPosted: 22:20 - 24 Dec 2004    Post subject: Reply with quote
Hi

No more info, but it does seem to be quite common.

All the best

Keith
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simon1221
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PostPosted: 17:59 - 25 Dec 2004    Post subject: Reply with quote
rite thanks
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Smoto Bob
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PostPosted: 20:40 - 25 Dec 2004    Post subject: Reply with quote
gsxrboy wrote:
Its to do with the mixture of fuel / air, when you have turned the fuel off right at end it will run lean this in turn increases the revs.

Kickstart any more info? Very Happy


what he says my 60bhp(ish) ktm250 used to do that like crazy when it ran out of fuel Shocked

set it back to stock and start again
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simon1221
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PostPosted: 21:09 - 25 Dec 2004    Post subject: Reply with quote
what the mixture settings? huh?
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loply
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PostPosted: 22:53 - 25 Dec 2004    Post subject: Reply with quote
Yeah its obviouslly just going lean ie less fuel per air and thus revving.

Note that going lean will also make it go hot so you wouldnt want to do that too often.
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simon1221
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PostPosted: 13:41 - 26 Dec 2004    Post subject: Reply with quote
ah rite ok then, but if i am going to run out if fuel then it is going to happen and i cannot really help it

yes i guess if i turned it off then razzled it to 12k revs then it would blow, but that isnt something im goin to do

cheers for your input
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Last edited by simon1221 on 18:44 - 27 Dec 2004; edited 1 time in total
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Big Pete
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Joined: 18 Jul 2004
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PostPosted: 18:40 - 27 Dec 2004    Post subject: Reply with quote
Maximum power is produced on a slightly lean mix, so for a constant throttle opening and load (idle) the revs will pick up as the mix leans out from fuel starvation.
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