I'm trying to get my 2000 Katana 600 to cold start more easily/reliably so that I can start riding it to work.
I have read all the way back through something like 24 pages looking for "starting trouble" threads to get as much info as I can.
First off I'm in San Diego and its like mid 70's right now so cold weather is not an issue. If it has been ridden within 15 hours it starts ok. After that, here's what happens:
With the choke off, and no throttle (throttle completely closed), pressing only the start button, the motor turns over aggressively and will usually "putt" a few times while turning over, sounding like its going to start but doesnt. It just goes back to the motor cranking over.
Sometimes it will start, and I let it run for 4 or 5 seconds and then try to give it a little gas. As soon as I give it gas, it dies. Doesnt matter if I give it a lot of gas or a little. Of course if I dont give it gas then it will eventually die on its own after about 9 or 10 seconds.
Bike will NOT cold start, or even "putt" with the choke on.
Bike will NOT start, or even "putt" with the choke off, if I give it any
throttle at all while pressing the start button.
Changing to petcock to "PRI" makes no difference.
Eventually, after repeating the start process and recharging the battery 2 or 3 times in between, I'll get it started and then throw the revs up, put the choke on, and once the engine is warm, no problems at all.
Here is what I've done: I've changed the inline fuel filter and made sure the tank has no rust. I pulled the plugs and made sure they all have spark. They do. All plug tips are chocolate brown.
Have a new air filter in, so its clean, and the airbox is securely connected to the throttle bodies? or carbs. Whatever its suppost to be connected to, its locked tight.
The fuel lines all seem fine (no creases or pinches or anything) but I didnt suspect that anyway since everything runs ok when the engine is warm.
I *believe* fuel is vacum fed.
I've ordered a service manual but they didnt have it in stock, I should be able to pick it up this weekend.
I'm trying not to clean the carbs if I dont have to. The bike has less than 5k miles but it is also 5 years old. I dont know if it was stored properly or if there is anything I am supposed to check/change/fix, and also dont know how much of that the dealership handled and I wouldnt trust them to tell me.
Sorry this is so long winded, I am at the end of this post now. I'm thinking that probably the fuel/air ratio needs to be adjusted. I'm thinking it is running too rich. Anyone have an opinion on that?
I found a thread that mentioned turning both screws off, and then back on 2.5 turns, and then "Adjusting from there". But I dont know what "adjust from there" means or how to properly do it.
Thanks for any help or advice, it's really appreciated.