stock carb tuning
Moderator: Moderator
stock carb tuning
R u supposed to set needle first, or air fuel screw first? Does it matter? Thx
Re: stock carb tuning
On which carb/scooter? Is everything else stock?
Honda Elite SR
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Honda Elite-Dio ZX
Dio ZX Headlight/Disc Brake Mod: http://hondaspree.net/phpBB3/viewtopic.php?t=30861
Re: stock carb tuning
Sorry. 72cc DD50. Stock carb upjetted, stock airbox. When I roll on from about 1/4 throttle, I get an occasional bog. Always in the same spot. Dropped needle to second notch from top, adjusted a/f screw, but no luck.
Re: stock carb tuning
I can adjust the idle
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- BMX
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Re: stock carb tuning
.run ur bike till the motor is warmed up check ur plug to see if its running too lean or too rich.. If its too lean give it more fuel by turning the air screw outwards if its too rich go inwards. Then after you get that fine tuned u can set ur idle screw.. Remember air screw is really sensative so turn it a little at a time.also if u wanna run ur filter tune with it on...cuz tunning it with out a filter is different from having it on...as long as ur bike can hold an idle for u to tune your fine cuz u can set that after tuning...
- patthesoundguy
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Re: stock carb tuning
You can't reall tell if the motor is running lean or rich by looking at the plug after running it normally or warming it up. If it's really really lean the plug could be very white, but cylinder damage would prob happen before you would have a chance to read the plug. To read a plug you have to install a new one after getting the motor up to temp and do a plug chop. And that will only tell you about wide open throttle. And you have the direction you turn the idle air screw backwards. It's an air metering screw so to richen the mixture you limit the amount of air flowing through the circuit by turning the screw in. What usually ends up happening with a stock carb when running a larger cylinder is the idle air screw ends up almost all of the way in if not all of the way in to get have almost no bogs in the low end.Eliterider wrote:.run ur bike till the motor is warmed up check ur plug to see if its running too lean or too rich.. If its too lean give it more fuel by turning the air screw outwards if its too rich go inwards. Then after you get that fine tuned u can set ur idle screw.. Remember air screw is really sensative so turn it a little at a time.also if u wanna run ur filter tune with it on...cuz tunning it with out a filter is different from having it on...as long as ur bike can hold an idle for u to tune your fine cuz u can set that after tuning...
Dude! Ya Can't Fix Stupid!
84 Spree stock
84 Spree Dio AF18E MHR Cylinder Arrow Pipe 28mm OKO
80 Express, 47mm DR BBKit, Weak Ends Intake, Boyesen Dual stage reeds, 19mm Delorto carb, MLM pipe
79 Express
85 Aero 80 stock
84 elite 125 stock
84 Spree stock
84 Spree Dio AF18E MHR Cylinder Arrow Pipe 28mm OKO
80 Express, 47mm DR BBKit, Weak Ends Intake, Boyesen Dual stage reeds, 19mm Delorto carb, MLM pipe
79 Express
85 Aero 80 stock
84 elite 125 stock
Re: stock carb tuning
Thx I know how to adjust a/f mixture, but just wondering if u adjust needle or screw first.
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- BMX
- Posts: 34
- Joined: Thu Mar 17, 2016 12:11 am
- Location: Honolulu hawaii
Re: stock carb tuning
Adjust ur air screw first
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- BMX
- Posts: 34
- Joined: Thu Mar 17, 2016 12:11 am
- Location: Honolulu hawaii
Re: stock carb tuning
Pat u r rite when u talked about being too late..but it doesnt take that long to warm up a bike..checking the plug is a good start to tune a bike that way u prevent it from running too lean..its the basics of tunning a bike then eventually guys move on to just how it feel and how their bike sound...lol i did get my air screw backwards..
Re: stock carb tuning
rajah. will try and report back. thank u guys
Re: stock carb tuning
Changed to bigger pilot and main. Af screw 1 1/2 turns out, 2nd clip from top. Tried different positions and settings with no luck eliminating hesitation from quarter throttle roll on. Always in this spot only. Bike idles perfectly, accelerates nice. Also went back to new stock clutch and new rear trans. Thinking maybe needle size is wrong? Help! Thanks
Re: stock carb tuning
Btw, after adjusting af screw first, changing the clip position messed the af mixture. Bike would barely run