Hey so the problem is that under power the when the throttle is about 90% or so the bike doesn't have power. It feels like its robbing the power. I just cleaned the carbs, I've been bad and let the bike sit for a couple of years. It still can be ridden but you can't really power your way out of anything. I also am having a hard time getting the idle to normalize, not sure if these issues are tied, or if i need to spend more time with the idle adjustment and fine tune it better.
I got a 09 GS500F with 20,140km on it.
You may be hitting fuel starvation issues. Make sure your tank vents in right and petcock flows fine. Both are known problems.
Cool.
Buddha.
The petcock flow is fine, not sure how to check the tank vent. Do you mean the hose that comes from the bottom of the tank, that is the drain if your overfill the tank?
The GS vents through the cap actually. So get enough muck in there and it would plug up. Try blowing the thing inside to out, or remove the cap and put it to an air compressor nozzle.
Cool.
Buddha.
Hey I ran into another scenario which might cause this problem, and I have sorta struggled with it through a gen 1 and gen 2 carb on my 95.
The 2nd possibility and if this is the case the problem will get worse and worse, and in a gen 2/3 carb it will hit the right cyl, but in a gen 1 left cyl is that you're getting a small amount of fuel into the vacuum line due to a tiny hole in the diaphragm.
That would effectively cause the cyl to choke on its own fuel. It is initially characterized by a bike that's easy to start and almost runs fine without choke and as vacuum drops when the revs rise, it actually works well enough till WFO where there's enough fuel getting in via the vacuum port that it kills that cyl.
Now I diagnosed it in mine this week, I am yet to fix it and get my theory proved right. You might get to it before I do at this rate. But please try and let me know.
Cool.
Buddha.
Is your jetting standard?
Quote from: herennow on August 06, 2021, 06:08:25 AM
Is your jetting standard?
I'm sure you were asking the OP, but didn't want you hanging out without a response so I'm at 125/40/1washer/3 turns with stock airbox and slipon. Bike developed that high throttle opening power loss almost 2 yrs ago but it was not noticeable much. Was parked 16+ months and now was not even running on left cyl and was filling it up with gas too.
OP - He was asking you I'm sure.
Cool.
Buddha.
that's exactly the jetting I wound up with Buddha, same exact setup, 125/40/1washer but more like 2 turns but I think it's lean at idle because I think the choke wasn't all the way off when I set it.
127.5 caused the cutout but it was rpm related, like 9K, at WOT, not throttle across entire rev range.
Yea the 127.5 makes it soft at high rpm and a 42.5 pilot soft at take off. So a 40 and 125 are the outer limits before you fall off the cliff.
The manual for canadian carbs confirms it. No EPA and they put 40/125 adjustable needles and 3 turns in those.
Cool.
Buddha.
Quote from: herennow on August 06, 2021, 06:08:25 AM
Is your jetting standard?
Hey sorry work kept me busy. Standard jetting.
Quote from: The Buddha on August 05, 2021, 04:41:06 PM
Hey I ran into another scenario which might cause this problem, and I have sorta struggled with it through a gen 1 and gen 2 carb on my 95.
The 2nd possibility and if this is the case the problem will get worse and worse, and in a gen 2/3 carb it will hit the right cyl, but in a gen 1 left cyl is that you're getting a small amount of fuel into the vacuum line due to a tiny hole in the diaphragm.
That would effectively cause the cyl to choke on its own fuel. It is initially characterized by a bike that's easy to start and almost runs fine without choke and as vacuum drops when the revs rise, it actually works well enough till WFO where there's enough fuel getting in via the vacuum port that it kills that cyl.
Now I diagnosed it in mine this week, I am yet to fix it and get my theory proved right. You might get to it before I do at this rate. But please try and let me know.
Cool.
Buddha.
Actually what is funny is that since I bought the bike, when on choked it would Rev up to 4500, now it barely goes above idling. Starting seems to be harder now. I still got to clean the cap. I know the vacuum line isn't getting gas in it. Long story short, I sucked on hoses enough to know that lol.
The only thing that I did was took the jets out and cleaned off the green crap that was plugging them. As far as I know I didn't adjust any of settings. Honestly I'm alittle lost. I'm hoping the cap vent will work, to be honest I'm not sure where to clean on it, but I'll look at photos tonight to figure it out.