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Old 03-22-2011, 01:30 PM   #1 (permalink)
Joined: Mar 2011
From: UK

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Help!!! ZX7r sluggish when riding

hi guys,
i am stuck!
after my 1998 7r went sluggishly crap we (my mate and I) put new irridium plugs in and when putting airbox back on noticed petrol coming out of one of the nipples on the fuel regulator thingy bob! (my mate knows a bit about bikes I dont!!)so he checked the diaphram etc and we ended up with a new one. problem solved? not a chance!
when the bike was put back together the fuel leaking issue was fine but when riding the bike @ approx 45 mph @ about 6000 rpm the bike rode really sluggish as though the plugs had gone down all over again, at slow speeds it isnt noticable and on tickover it revs really well!!
apart from putting her in the garage and leaving her there to become a treasured Antique in 40 yrs time, what can I (my mate) do to fix this????
many thanks guys!!!
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Old 03-22-2011, 02:11 PM   #2 (permalink)
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sounds like you need a good carb clean because your floats sound like they are sticking...

clean them up good and sync the carbs and I am sure the bike will run great!
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Old 03-22-2011, 02:17 PM   #3 (permalink)
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Also, could be that you (your mate) missed or crossed a vacuum line somewhere?
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So EZ, a caveman can do it.
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Old 03-22-2011, 02:21 PM   #4 (permalink)
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yep really sounds like a carb cleaning and back firring and sluggesness is caused from
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Old 03-22-2011, 03:09 PM   #5 (permalink)
Joined: Mar 2011
From: UK

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cheers for the fast response guys,
the carbs have been cleaned and the floats checked one at a time and were all clean and good,
i know from looking at the old receipts that it has been on a dynojet and been balanced and set up about 18 months ago??!!
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Old 03-22-2011, 05:48 PM   #6 (permalink)
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reinspect all the vac lines. most times on the 7 shitty running after 4000 or 5000 rpm is attributed to vac leaks on the airbox or the float bowl pressure reference lines.
check those and re sync the carb rack and you'll drastically reduce shit that could be wrong.

the leaking is one of 2 things. leaky float or loose/leaky float bowl drain screw.

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I agree. (with whitey)
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