Carbs just aint right...help...please - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 7 (permalink) Old 06-29-2008, 07:17 AM Thread Starter
 
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Post Carbs just aint right...help...please

87 FZR 1k and I finally got a chance to spend alittle time together after she sat for a couple of weeks. When I started her up on the the choke the exhaust seemed "muffled". I thought it was maybe from sitting and blow her alittle. The "muffled" and slight "fludder" never went away and can't reach a speed over 75mph, feels like theres no fuel. Drained tank, put fresh gas in just to be sure and same thing. New fuel filter, and petcocks. Is it time for a carb rebuild?
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post #2 of 7 (permalink) Old 06-29-2008, 12:00 PM
 
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May just need cleaning, one of the jets might have some gunk blocking it. Try spraying carb cleaner



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post #3 of 7 (permalink) Old 06-29-2008, 10:00 PM Thread Starter
 
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Thanks Vash!

While I'm in there cleaning, might as well check my float levels. I saw in previous post for an EXUP that the floats were to be set at 14mm. Is that correct for mine as well?
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post #4 of 7 (permalink) Old 07-08-2008, 01:49 PM
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Quote:
Originally Posted by Dilligas View Post
87 FZR 1k and I finally got a chance to spend alittle time together after she sat for a couple of weeks. When I started her up on the the choke the exhaust seemed "muffled". I thought it was maybe from sitting and blow her alittle. The "muffled" and slight "fludder" never went away and can't reach a speed over 75mph, feels like theres no fuel. Drained tank, put fresh gas in just to be sure and same thing. New fuel filter, and petcocks. Is it time for a carb rebuild?
Any chance that a mouse may have built a nest in the exhaust? That may explain the muffled exhaust note.

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post #5 of 7 (permalink) Old 07-09-2008, 10:27 AM Thread Starter
 
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Bike has a supertrapp on it so that is unlikely. Taken carbs off for a complete cleaning and going through. Don't know when it was done last.
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post #6 of 7 (permalink) Old 10-22-2008, 03:24 PM
 
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Never heard of a mouse in the exhaust.
post #7 of 7 (permalink) Old 11-01-2008, 04:47 PM
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1987

Fuel level: 3.8 - 4.8 mm
Pilot screw: 3.0 turns out

These carbs are pretty sensitive to synchonization. Once you get everything set to baseline, synch, and then make your fine adjustments.

It's good to use a infrared thermometer to help you get the pilots right. Often the inner two carbs will be a need to be a little richer or leaner due to the heat.

Dan
1991 FZR 1000 - built 1040 with race cams, Akrapovic full exhaust, and mild suspension work
2004 YZF R1 - Graves full exhaust, velocity stacks, BMC race filter, and Power Commander. Rear Ohlins. Forks rblt with Race Tech springs and Gold Valves.
2005 20th Anniversary V-Max (0098/2000) - T boost,
2005 YZF R6 track bike - Graves full exhaust, Race Tech suspension
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