Engine will not come down to idle still......
Posted June 12, 2002 - 07:03 AM
When riding, when I drop the throttle, it sometimes hangs about 250-300 rpm's high. Sometimes it will then drop by itself, other times I have to crack the throttle a time to two before it will drop.
I have taken the carb out, and determined that I am running a 45 pilot, and 172 main. I talked to the guy at the local Yamaha shop, and he said that is the jetting he is running, except that he has YZ timing and a YZ needle.
Whilst in the carb, I tried cleaning all jets and orifaces. I also ensured that I do not have any air leaks on hoses outside of the carb.
So, if I have recently replaced the slide plate (it is not cracked or placed in backwards) the jetting is supposed to be right, and I have no air leaks from hoses outside of the carb. What is left? Is there gunk in the pilot circuit that I am missing?
I took out the plunger and polished that up, and made sure that there was nothing on/in/around the diaphram. What/where else is there to be looking?
Posted June 12, 2002 - 07:25 AM
You're lean on the pilot circuit. Try richening the fuel screw a bit - if you go too far out on the FS then go to a larger pilot jet.
Posted June 12, 2002 - 07:32 AM
I dont know anything about jetting, but, usually a hanging idle is a sign of being lean isn't it?? This would have to be something in the pilot circuit I would think. I might try messing with the Pilot Screw. Try going out some. I am sure the others may know more about this than I do, but, if you go out two turns without fixing the problem, then there may be some jetting changes involved. What position is you clip in? How does the bike run other wise? Stuck/sticky throttle cable?
Just suggestions, don't know for sure
Posted June 12, 2002 - 07:38 AM
Posted June 12, 2002 - 07:43 AM
Other than that, the bike is a rocket. No complaints at all. Mid through WOT, the bike is responsive and quick. Economy is decent, as I get from 80-100 miles before I have to switch to reserve.
What is the needle clip position? Good question. Will have to check that out. As far as sticky cables, I am guessing that could be an issue. When I dorking with it this weekend, I was making sure that the throttle was not hanging up, and that I had about 1/8th of an inch of free play in the cable. I DID find about 3 or 4 strands that had burred on the throttle cable. I bet that is my issue.
Any seconds to that motion?
Posted June 12, 2002 - 07:59 AM
Posted June 12, 2002 - 08:53 AM
Posted June 12, 2002 - 12:23 PM
What needle, needle clip & PAJ are you running with that 35 Pilot Jet?
Posted June 12, 2002 - 02:54 PM
PA Screw 1/4 turn out = 45 PAJ
1/2 sec APJ squirt
Posted June 12, 2002 - 06:15 PM
Posted June 12, 2002 - 07:23 PM
Posted June 13, 2002 - 07:25 AM
Posted June 13, 2002 - 08:11 AM
I called around, and the Service Shop at the Yakima Yamaha has the ability to rebuild cables as long as the sheath is still in good repair. I am going to ride in the poker run in Naches this weekend, so I am going to take off out of Wenatchee a couple of hours early on Friday, hit the Yakima shop by 5. They said that we can have that thing replaced in less than 1/2 hour. So, I am going to do that. If the problem still persists, then it will be more exploring of the carbs innards.
B from Chee