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jasonu
27th April 2015, 07:06
A couple of questions about carb issues on a 1988 GSXR1100.

1.What effect would a 5mm split in 2 of the slide diaphragms have on the performance?

2. What effect would one blocked pilot jet have?

Cheers all.
Grumph
27th April 2015, 07:12
Quick answer is it would run like shit. The split diaphragms make slide lift uneven - shows up well on gauges when synchronising carbs. Blocked pilot means you'd get one chiming in later than the others.
Pretty sure diaphragms are available from a guy in the UK who specialises in carb rubber bits.
jasonu
27th April 2015, 07:24
Quick answer is it would run like shit. The split diaphragms make slide lift uneven - shows up well on gauges when synchronising carbs. Blocked pilot means you'd get one chiming in later than the others.
Pretty sure diaphragms are available from a guy in the UK who specialises in carb rubber bits.

Cheers.
The major issue is idling. It will idle on choke. It will idle at about 2.5-3k rpm if I wind the idle nob in far enough. If I wind the idle nob back out to lower the rpm it will hold slow idle for a few seconds then die. Otherwise the thing runs like a scorched cat.

Parts are not an issue here.
http://www.partzilla.com/parts/search/Suzuki/Motorcycle/1988/GSX-R1100/parts.html
Grumph
27th April 2015, 07:56
Cheers.
The major issue is idling. It will idle on choke. It will idle at about 2.5-3k rpm if I wind the idle nob in far enough. If I wind the idle nob back out to lower the rpm it will hold slow idle for a few seconds then die. Otherwise the thing runs like a scorched cat.

Parts are not an issue here.
http://www.partzilla.com/parts/search/Suzuki/Motorcycle/1988/GSX-R1100/parts.html

At idle you get an air leak through the diaphragms, Once the throttle is cracked, not so noticeable.
jasonu
30th April 2015, 13:10
Can anyone tell me what the tubes (2 of them marked with red ink from carbs 2 and 3) do?
The seam to simply vent to the atmosphere. When I blow through the fuel supply line air comes out of them. When I pulled the carbs out there was no tubes connected to them. There is no mention of them in my workshop manual.
Cheers all.
jasonu
30th April 2015, 13:20
Anyone know the factory setting for the pilot screw?
Grumph
30th April 2015, 16:51
Does nobody reduce pics on here ?

those are just float chamber breathers afaik.
pilot adjuster 2.0 turns

But that's UK market info used with 42.5 pilots and 4D13 needles.