I have symptoms of both lean and rich Uneven acceleration & bogs - rich Surging at 1/4 throttle - lean Runs better cold - rich Backfires as loud as a rifle - lean Spark plug a little black but looks normal No smoke A little bit of soot in the valves Carburetor has the slide needle dropped all the way down I’ve been chasing these symptoms for 9 months now and haven’t found the issue Did a carb clean, replaced the petcock, new air filter, spark plug, the motor is hardly broken into. 3,900kms, so the jets in the carb are brand new and clean. The motor is in time as well I took it to a few mechanics and they don’t even know what’s wrong
Are those symptoms present at all throttle positions? I'd be curious if you are lean or rich at idle or low throttle, and the opposite as you near full throttle. If that's the case, you could have a pilot jet issue causing your low throttle issues and a main jet or needle causing the opposite issues as you increase throttle
How does ethanol affect ECM/PCM fuel trim calculations? Does it require the same 14.7:1 ratio calculations or some other ratio? If so does the ECM/PCM sense whether the fuel is ethanol or gasoline and use a different ratio for ethanol? If the ECM/PCM assume gasoline is used and does not adjust for the use of ethanol what is the impact on air/fuel calculations and fuel trim outputs? How does this affect scanner outputs, rich, lean, etc.? Is there a YT video that addresses these questions? Bottomline: How does the ECM/PCM adjust for these two different fuel types with different optimum air/fuel ratios, or does it not, and what are the impacts on scanner readings and diagnosis? Again, is there a YT video that addresses these questions?
Thanks for this wonderful video. I have a 2-stroke 250 cc bike . I put in a new carb and I am facing problem starting the bike most of the time. And once started, It has a very jerky/ uneven response during the low speeds but at higher speeds it feels very crisp and perfect. One more thing, if I fail to get the bike started, I block the air intake (by removing the pipe and putting my hand), the bike almost starts instantly ! Am I running too lean a mix or could it be an issue with the idle jet size?
I’ve got a 90’ rm250 and couldn’t get it to start at 6000’ ft elevation. Went back to stock jetting and fired right up running 40:1 ratio. Just switched to 32:1 ratio and it ran like crap. Going back to 40:1 to see if it runs good again, if not moving to reed replacement or further replacements.
I have symptoms of both lean and rich
Uneven acceleration & bogs - rich
Surging at 1/4 throttle - lean
Runs better cold - rich
Backfires as loud as a rifle - lean
Spark plug a little black but looks normal
No smoke
A little bit of soot in the valves
Carburetor has the slide needle dropped all the way down
I’ve been chasing these symptoms for 9 months now and haven’t found the issue
Did a carb clean, replaced the petcock, new air filter, spark plug, the motor is hardly broken into. 3,900kms, so the jets in the carb are brand new and clean.
The motor is in time as well
I took it to a few mechanics and they don’t even know what’s wrong
Are those symptoms present at all throttle positions? I'd be curious if you are lean or rich at idle or low throttle, and the opposite as you near full throttle. If that's the case, you could have a pilot jet issue causing your low throttle issues and a main jet or needle causing the opposite issues as you increase throttle
Lean is mean and costs you the green! Error on the side rich!
You're a poet and don't know it.
@@PartzillaParts Heh... so are you.
How does ethanol affect ECM/PCM fuel trim calculations? Does it require the same 14.7:1 ratio calculations or some other ratio? If so does the ECM/PCM sense whether the fuel is ethanol or gasoline and use a different ratio for ethanol? If the ECM/PCM assume gasoline is used and does not adjust for the use of ethanol what is the impact on air/fuel calculations and fuel trim outputs? How does this affect scanner outputs, rich, lean, etc.? Is there a YT video that addresses these questions? Bottomline: How does the ECM/PCM adjust for these two different fuel types with different optimum air/fuel ratios, or does it not, and what are the impacts on scanner readings and diagnosis? Again, is there a YT video that addresses these questions?
Thanks for this wonderful video. I have a 2-stroke 250 cc bike . I put in a new carb and I am facing problem starting the bike most of the time. And once started, It has a very jerky/ uneven response during the low speeds but at higher speeds it feels very crisp and perfect. One more thing, if I fail to get the bike started, I block the air intake (by removing the pipe and putting my hand), the bike almost starts instantly ! Am I running too lean a mix or could it be an issue with the idle jet size?
I’ve got a 90’ rm250 and couldn’t get it to start at 6000’ ft elevation. Went back to stock jetting and fired right up running 40:1 ratio. Just switched to 32:1 ratio and it ran like crap. Going back to 40:1 to see if it runs good again, if not moving to reed replacement or further replacements.
Do you have information on the 3236 weber
My exhaust smells like rotten eggs especially on startup
Rotten eggs = lean mixture
Can't wait for the Non-carbureted version video...
I guess in terms of symptoms, they will be the same. However, to solve the issue will be a different matter
I got both. Is that in the middle. It's pwk 21mm on gy6 80 with CVT transmission
Been using my Corolla for three years after I got that check engine light stating it was running rich.
Fix white smoke
👍🇸🇦
Well done. Vry good info!
Brilliant!
😊😊
"promo sm" 🔥