Can the squirt be adjusted to compensate for delay? By adjusting accelerator pump, squirt on and off with the screws on right side of carb. Top screw turns on fuel faster at throttle blip and lower screw controls off squirt time. The reason I ask is if these adjustment are made to control blipping will it effect throttling while riding and down shifting? A good post to understand Mikuni BSR 40 CV carb is Road Star Clinic forum…”Jetting the Road Star Mikuni 40 Carb”. Read the entire script and you will be pleased and have a better understanding of how the carb operates and why. It’s not just jetting, it breaks down the entire engineering theory and every part. I feel like a master of carbs after reading it…you will too and be able to help anyone frustrated. I’m waiting for a post that explains vacuum and vent hoses. With and without AIS. If anybody tells you it’s normal that blipping you’re throttle and backfiring through carb and exhaust after aftermarket add ons is normal then they didn’t take the time to do it right to correct it. They just live with it. Thank you for your video and the do it yourself overhaul. Read the article before watching this young man’s video on overhaul and carb cleaning. Know what you are doing and why. Hope this help you all!
I switched to the ngk iridium spark plugs (DPR7Eix-9) #7803. 5 years ago. Afterwards my backfiring when I let up on the throttle disappeared. My first set of these plugs lasted over 20 thousand miles though I did notice some rusting on the far forward left plug from water sitting in the area. I have tendency to wash my bike a lot and the water was most likely from me. So now i take the bike for a drying out ride after her bath. Lol. Or I just use the air from my compressor to blow those areas dry. Any excuse to ride is good though.
@@RJPHOENIX that is what I do but sometime is annoying specifically when you are waiting at traffic lights and you what to take off quickly and it dies. Love my motorcycle but sometimes I wish I had the FI one. Thank you for the reply
Hi Doc, Unfortunately with those huge pistons it takes things a lot longer to get moving... The volatile fuel that lingers will ignite with the next intake stroke. Advance is set by vacuum advance too so ignition of the fuel all happens in slow motion... it's just the nature of the beast... Thand goodness Yamaha went to fuel injection two years later.
My Kawasaki is doing that at idle but once it does it dies it will crank right back up but it continues to blip and if you give it throttle it will idle high and I have to adjust it back down to normal idle then it starts the whole process over any ideas
Probably a good Idea to get your jets adjusted... But before that, re-gap your plugs or swap them out for hotter ones... You may want to check your compression and timing, when your swapping out you plugs too... Basically "bipping" is caused by the fuel being ignited in the intake manifold.
Indranil Biswas backfire on deceleration is a sign of too much fuel in the cylinders... if you can't adjust your carburetor start with adjusting the spark plug gap... if the plug gap is too small it won't burn all the gas and the unburnt fumes in the exhaust ignite on the next cycle.
@@ibtheunbreakable5745 I know this is old but. Some bikes are designed to burn every bit of fuel. My roadstar came with some emissions system thing. I don't even know what it's called. My buddy removed it for me and no more pop pop. Probably not the best thing for the environment but the popping was very annoying.
There is no way to "set it right"... All velocity feed, non throttle body carbs are primed with a "squirt" of fuel from the accelerator pump... It more a matter of how fast you twist the grip that controls to amount of fuel into the manifold and how fast that fuel can be consumed in the cylinders.
Thanks, Phoenix!
Saved me a lot of headache and research....it just the nature of the beast.
This is really an awesome video. I always thought that sound was the spark plug misfiring. Keep up the great work!!
Can the squirt be adjusted to compensate for delay? By adjusting accelerator pump, squirt on and off with the screws on right side of carb. Top screw turns on fuel faster at throttle blip and lower screw controls off squirt time. The reason I ask is if these adjustment are made to control blipping will it effect throttling while riding and down shifting? A good post to understand Mikuni BSR 40 CV carb is Road Star Clinic forum…”Jetting the Road Star Mikuni 40 Carb”. Read the entire script and you will be pleased and have a better understanding of how the carb operates and why. It’s not just jetting, it breaks down the entire engineering theory and every part. I feel like a master of carbs after reading it…you will too and be able to help anyone frustrated. I’m waiting for a post that explains vacuum and vent hoses. With and without AIS. If anybody tells you it’s normal that blipping you’re throttle and backfiring through carb and exhaust after aftermarket add ons is normal then they didn’t take the time to do it right to correct it. They just live with it. Thank you for your video and the do it yourself overhaul. Read the article before watching this young man’s video on overhaul and carb cleaning. Know what you are doing and why. Hope this help you all!
Why engine gets off when giving suddenly and full throatal...?????? Plz reply
No need to blip.. Ever. Good video.
The earlier Vulcan 800s are notorious for this
So lean mixture was the problem?
Thank you and great video perfect
I switched to the ngk iridium spark plugs (DPR7Eix-9) #7803. 5 years ago. Afterwards my backfiring when I let up on the throttle disappeared. My first set of these plugs lasted over 20 thousand miles though I did notice some rusting on the far forward left plug from water sitting in the area. I have tendency to wash my bike a lot and the water was most likely from me. So now i take the bike for a drying out ride after her bath. Lol. Or I just use the air from my compressor to blow those areas dry. Any excuse to ride is good though.
So it’s normal? My sporty does this
I'm facing same issue in yamaha fz16 can you suggest me some good ideas for it?
Hlo
Plz contact.... Me
@@mobinmobin3238 hii
Is this because of the massive air leak in the intake manifold?
so the problem is more air?
I know this video was posted a long time ago but I came across it and I have the same issue with my 06 roadstar, what is the solution to this problem?
Opening the throttle slower and more evenly helps. But it;s the nature of a constant velocity carb to always produce this condition.
@@RJPHOENIX that is what I do but sometime is annoying specifically when you are waiting at traffic lights and you what to take off quickly and it dies. Love my motorcycle but sometimes I wish I had the FI one. Thank you for the reply
thats a beautiful bike
Thank you
surely it shouldnt do this at all if the cam timing and valve gaps are correct
Hi Doc,
Unfortunately with those huge pistons it takes things a lot longer to get moving... The volatile fuel that lingers will ignite with the next intake stroke. Advance is set by vacuum advance too so ignition of the fuel all happens in slow motion... it's just the nature of the beast... Thand goodness Yamaha went to fuel injection two years later.
My intake gasket keep getting blown
And the fix= insert tab A into slot B.
What Tha HAYELL 😎
How to splf it
My Kawasaki is doing that at idle but once it does it dies it will crank right back up but it continues to blip and if you give it throttle it will idle high and I have to adjust it back down to normal idle then it starts the whole process over any ideas
Probably a good Idea to get your jets adjusted... But before that, re-gap your plugs or swap them out for hotter ones... You may want to check your compression and timing, when your swapping out you plugs too... Basically "bipping" is caused by the fuel being ignited in the intake manifold.
whwn i suddenly deaccilation.. my bike ... backfire started ...plz help me,,how to solve
Indranil Biswas backfire on deceleration is a sign of too much fuel in the cylinders... if you can't adjust your carburetor start with adjusting the spark plug gap... if the plug gap is too small it won't burn all the gas and the unburnt fumes in the exhaust ignite on the next cycle.
Bob Phoenix
I change piston, head all things...
But its prob same to same
That's normal dude. Don't worry all bikes pop when decelerating.
@@ibtheunbreakable5745 I know this is old but. Some bikes are designed to burn every bit of fuel. My roadstar came with some emissions system thing. I don't even know what it's called. My buddy removed it for me and no more pop pop. Probably not the best thing for the environment but the popping was very annoying.
bs if you get it set right it want do that
There is no way to "set it right"... All velocity feed, non throttle body carbs are primed with a "squirt" of fuel from the accelerator pump... It more a matter of how fast you twist the grip that controls to amount of fuel into the manifold and how fast that fuel can be consumed in the cylinders.
like