Speedy3
February 9th, 2017, 06:22 PM
issue: Motorcycle starts with full choke. Needs idle adjuster turned quite a bit, but will sit at 1.5k after a couple minutes. SOMETIMES. Other times it will die. If I am able to get it to idle with no choke, it will hesitate under a sharp throttle. Now I understand the engine is not warm, but I imagine it's worth mentioning. There were also a couple of times (can't remember if choke is engaged or not) that the idle hung around 2/3k even after throttle was closed. Now, the cables are not pristine, but the throttle moves fully under its own tension and the throttle position closes fully.
Before starting it (for the first time since owning):
cleaned carbs fully (main jets and pilot jets. FULL daylight through every single hole). Air mixture screws @ 2.5 turns each
New gas, New tank, adjusted valves, cleaned air filter
So far, as diagnosis, I have sprayed WD40 on all boots during idle, zero sign of any boots leaking (I read this is typical of hanging idle). I checked the clean sure system by feeling the air hose on top of the airbox: service manual says to check for steady pulsating air: check. All the hoses in the vac system seem to be connected very well.
I have researched a ton, but just about everything I find is "been sitting" or "haven't ridden it since"... All of the fueling pieces should be spotless from my work! I am open to any thoughts, but have these directed questions:
needed the choke on is consistent with a lean mixture, which I imagine hesitating throttle is also. That said, this bike has a short exhaust with no baffle, and I don't believe it was jetted accordingly. Would closing the air mixture screws a bit help remedy this?
I guess that's it. The guy who had this motorcycle was no where clean or meticulous with service. But the motorcycle ran, at least, without cutting out, hesitating, or over hanging. I'm so close to finishing this bike up, and I'm getting so overwhelmed :confused:
Before starting it (for the first time since owning):
cleaned carbs fully (main jets and pilot jets. FULL daylight through every single hole). Air mixture screws @ 2.5 turns each
New gas, New tank, adjusted valves, cleaned air filter
So far, as diagnosis, I have sprayed WD40 on all boots during idle, zero sign of any boots leaking (I read this is typical of hanging idle). I checked the clean sure system by feeling the air hose on top of the airbox: service manual says to check for steady pulsating air: check. All the hoses in the vac system seem to be connected very well.
I have researched a ton, but just about everything I find is "been sitting" or "haven't ridden it since"... All of the fueling pieces should be spotless from my work! I am open to any thoughts, but have these directed questions:
needed the choke on is consistent with a lean mixture, which I imagine hesitating throttle is also. That said, this bike has a short exhaust with no baffle, and I don't believe it was jetted accordingly. Would closing the air mixture screws a bit help remedy this?
I guess that's it. The guy who had this motorcycle was no where clean or meticulous with service. But the motorcycle ran, at least, without cutting out, hesitating, or over hanging. I'm so close to finishing this bike up, and I'm getting so overwhelmed :confused: