No throttle response 00' WR400F
Posted August 19, 2003 - 02:45 PM
The bike idles fine and runs fine at steady throttle settings all the way up to high rpm. The bikes sat for a couple of months while nursing injury. Noticed problem on first ride after down time.
Have attempted to fix with all methods listed above, and now in need of help and ideas.
Posted August 19, 2003 - 01:46 PM
Check to see if your accelerator pump is working. The rod on the side of the carb can get dirt etc. in its passage. After sitting its very possible to lock up. No squirt as well as to much both cause off idle bog. Sounds like you have covered must other solutions.
Posted August 19, 2003 - 01:48 PM
If I would have paid attention, sounds like you have done this. Do you have squirt?
Posted August 19, 2003 - 05:26 PM
I just finished taking the carb apart one more time, to recheck the slow jet. I started thinking that when I sprayed cleaner through the air cutoff valve the cleaner was running out the slow jet, and maybe I sprayed junk down into it. I pulled the jet out and cleaned it again because it didn't look great. The bike is running a lot better, but still is not perfect.
I have a 42 slow jet in the bike, and Yamaha of Troy lists a 45 as standard. Now I am thinking I might have always had to lean of a slow jet in the bike.
Posted August 19, 2003 - 06:04 PM
Have you ever removed the spark plug cap from the coil wire?
This caused me alot of grief. I reinstalled it by pushing it back on but it must be turned on because there is a spiral wire inside the cap that "threads" into the coil wire to make a good electrical connection. Without turning the cap on the wire my bike ran just as you had explained.
Posted August 20, 2003 - 04:02 PM