90 gsx750f not idling right

[csstaker]

bike will run with choke without issue but without it the rpms slowly die and it sputters out any ideas why this is happening just bought the bike for 700 dollars today found a crack in my second left float bowl bought a new one coming in the mail one of these day not sure if its my pilot jets or my main jets causing the issue any help would be awesome will post pics later

[Scotts]

Welcome,

Patience till your parts get in. I am having to wait as well. In the mean time I have been able to find an awesome amount of information to soak up here. You will find a tutorial on your carbs in the link. While you are this far into the carbs this information is really helpful.

Scott

[scottynoface]

Main jets have 0 effect on idle.

[csstaker]

so then im assuming its my pilot jets then because floats are all good all the gaskets are intact getting vac from all 4 carbs

[scottynoface]

so then im assuming its my pilot jets then because floats are all good all the gaskets are intact getting vac from all 4 carbs

Yuuuup.

Carbs need a good clean, not new jets.

[Wild-Bill]

More often than not, it's the passages in the carb bodies as well as the jets. Mikunis are like that. You're going to have to soak them. Hit the wiki and search for "carbs 101". The only messed up part of the wiki is that the A/F screws need to be set at 2.5 turns out, not 1.75.

[Kreylyn]

More often than not, it's the passages in the carb bodies as well as the jets.

+1~!!

Cleaning only the jets is like taking a nozzle off to clean it, leaving a water hose that is filled with dirt and wondering why you can't get the water to come out right.

Krey

[arsenic]

Cleaning only the jets is like taking a nozzle off to clean it, leaving a water hose that is filled with dirt and wondering why you can't get the water to come out right.

Krey

Excellent analogy.

[shpielers]

Carbs 101:

Http://katriders.com/wiki/index.php5?title=Carbs_101

Good luck with the new bike! Pretty sweet price!

[mykat]

Before you tear into the carbs:

Have you tried adjusting the idle speed screw? It should be within reach with the fairings on, you can twist it by hand. It's a hell of a lot easier than tearing into the carbs, worth a shot. Tighten it to increase rpms.

[XXWoodmanXX]

I had the same issue. I found that the passage between the main jet and pilot jet on the carb body itself was completely clogged. Unlike the older Mikunis, these Katana ones are so incredibly small, you have to make sure it's completely clean. Sucks, I know it, but it's what needs done. Good luck.

[csstaker]

Before you tear into the carbs:

Have you tried adjusting the idle speed screw? It should be within reach with the fairings on, you can twist it by hand. It's a hell of a lot easier than tearing into the carbs, worth a shot. Tighten it to increase rpms.

personally pretty new to working on bikes where would my idle screw be

[PaintItBlack]

What RPM should it idle at?

[csstaker]

What RPM should it idle at?

if im not mistaken i believe between 1300 and 1500 rpms

[PaintItBlack]

Ahh, thanks for that information.