Downshift misfire

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gsax
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Downshift misfire

Post by gsax » Mon Dec 18, 2006 10:48 pm

When blipping down the gearbox sometimes get a misfire, is this a common problem :?:
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Dee

Post by Dee » Tue Dec 19, 2006 10:47 am

Tell me if I'm being exceedingly silly, but it's not just overrun is it? A bit of popping and banging as opposed to outright misfire??? :huh:
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gsax
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Post by gsax » Tue Dec 19, 2006 11:13 am

Sorry, maybe should have said overrun. Can’t recall having it on a TDM a few years back.
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phuk72
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Post by phuk72 » Tue Dec 19, 2006 12:33 pm

Open pipes on the overrun tend to burble and pop - if it is actually banging the engine is running too rich.
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gsax
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Post by gsax » Tue Dec 19, 2006 5:09 pm

Misfire wasn’t the right description, “pop” would be better; happens very occasionally when blipping the throttle changing down (only when giving it some stick) It doesn’t seem to be a prob’ it sound’s quite good, I was just wondering if it’s normal.
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phuk72
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Post by phuk72 » Tue Dec 19, 2006 5:15 pm

If it's only occassionally and when giving it stick, the most likley cause is unburnt fuel in the exhaust igniting when the gear is re-engaged.

This can be achieved (with very amusing effects in tunnels) by flicking the kill switch, cracking the throttle and then flicking the switch again - he he he!
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Dee

Post by Dee » Tue Dec 19, 2006 6:12 pm

gsax wrote:Misfire wasn’t the right description, “pop” would be better; happens very occasionally when blipping the throttle changing down (only when giving it some stick) It doesn’t seem to be a prob’ it sound’s quite good, I was just wondering if it’s normal.
It won't do your engine any harm, certainly if it's only happening occasionally. Sounds great, doesn't it?! :wink:
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gsax
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Post by gsax » Tue Dec 19, 2006 6:30 pm

O yes I want more !!!!!!!!!
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Jak
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Post by Jak » Tue Dec 19, 2006 6:53 pm

phuk72 wrote:This can be achieved (with very amusing effects in tunnels) by flicking the kill switch, cracking the throttle and then flicking the switch again - he he he!
:twisted: oh yes - scared the crap outta a bunch of little scooter kids once - 2 or 3 of them hit the floor - I think they thought the bunch of bikers heading towards them were shooting at them LMAO
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dandywarhol
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Post by dandywarhol » Wed Dec 20, 2006 2:30 pm

I did it in Croatia last year and a local shielded his kid and lay flat on the pavement.................guess these folks still have bad memories :shock:

Most likely cause is a tiny leak at an exhaust joint, mixing air with the unburnt fuel...............
1996 TRX 850, blue, Ohlins 46HRCLS, Race Tech Gold Valves, 0.90 springs, Venom pipes, R6 brakes............
1974 Yamaha RD250A, Candy Blue
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