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TOPIC: GPz900R refuse WOT in 5th and 6th gear

GPz900R refuse WOT in 5th and 6th gear 18 Oct 2018 11:07 #792493

  • shamal
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I have a infline fuel filter, but since i had an experience like you in the past, i use no more paper filters. What i use is a plastic filter that work with a plastic net. Like this www.bits4motorbikes.co.uk/images/PartAcc...lass-fuel-filter.jpg
1983 kz 550 h

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GPz900R refuse WOT in 5th and 6th gear 21 Oct 2018 16:35 #792656

  • ajsfirehawk
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What about the gas cap vent? Have you tried a high rpm pull with the gas cap popped open? (apologies if this has been mentioned but I didn't see this question when I scanned the string)
79 KZ650 SR
80 KZ1000 Z1 Classic
83 KZ1100 LTD
06 ZG1000 Concours
02 Trans Am ... not enough time

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GPz900R refuse WOT in 5th and 6th gear 06 Nov 2018 04:19 #793450

  • shamal
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Gas cap vent e tank breather its ok. After alot of searching and testing i can say the problem is not fuel or engine related. Its something electric.
This morning i tried some pull in the highway. In 3rd gear she was able to pass easily 8000 rpm and then was like to be bolted on the endeavour shuttle. Waa!! Then i tried again and after 7000 rpm stumble again. Then another time and again she was pulling...
The only gear i cant reach rpm above 8000 is the 6th gear.
I replaced the alternator assembly some days ago and now its charging correctly. I replaced the plug caps too..
Can be a ignition coils problem? The coils are a pair of brand new generic coils from ebay, even if specific for this model of bike i think they can be crappy?
1983 kz 550 h

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GPz900R refuse WOT in 5th and 6th gear 05 Dec 2018 11:20 #794678

  • shamal
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Ok. After alternator replacement ican say the problem is 90%gone. Now is much more sharp at high rpm, and eventually in 4 or 5 gear the engine is able, not always, to reach the redline in a sudden explosion of wild power. Sorry for my english.
I think, since the only thing i changed was the alternator, the problem is something electric.
My question is, can generic spare coils from ebay cause this kind of problem? Insufficient spark? Something similar?
1983 kz 550 h

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