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Post by scvmarcus on Mar 30, 2008 4:53:50 GMT -5
A few notes as I start jetting my carb, thoughts or advice is appreciated   Slow & Main Jet Kits for stock carb. Also picked up 6g rollers Year: 2008 Carb Type: Stock Slow Jet: 38 (what is stock? wondering if I may not need to touch it) Main Jet: 85 Mixture Screw: Untouched Needle: Untouched Intake Mods: Opened up stock intake (front slit vents opened up, bored out air box intake port) Exhaust: SuperTrap (half stack of disks, will count soon) Engine Displacement: 50cc Cams: sStock CDI: None Altitude: 1130ft Temperature: 70-95 (for now) video url (youtube) www.youtube.com/watch?v=I1z-uTECLQM |
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Post by Dandy Dan on Mar 30, 2008 22:12:13 GMT -5
 Wow you seem very well prepared! And that video is very professional! If you made a similar video but included the part where you remove the stock carb from the Ruckus it sure would be helpful for others FYI, the stock slow jet is a 35. Have you tested out this setup yet? My guess is that it'll run well. You might get a bit of stutter off the line (more so when it's cold) and you might be a little rich up top (it'll may run fine but your milage may be less than possible). In my experience, opening up the stock airbox adds a lot more airflow off the line but not much up top. So you need to go with a decent sized main jet to get rid off the stumbling off the line but in doing so, you make it a bit rich up top. 80-85 is likely about as good as you can do for the main jet with your current setup.
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Post by scvmarcus on Mar 31, 2008 16:45:04 GMT -5
if you made a similar video but included the part where you remove the stock carb from the Ruckus it sure would be helpful for others Was going to do that actually. Im using my little sony handycam on a suction mount. I noticed the less I move the sharper it becomes - lol. This was my first time touching a carb so I did the recording with the focus on the jets themselves. Maybe I can chop it up later and include the carb removal process as well when i have a chance. FYI, the stock slow jet is a 35. Awesome - thank you Have you tested out this setup yet? In my experience, opening up the stock airbox adds a lot more airflow off the line but not much up top. So you need to go with a decent sized main jet to get rid off the stumbling off the line but in doing so, you make it a bit rich up top. 80-85 is likely about as good as you can do for the main jet with your current setup. Yes, was a bit cooler lately (60-65) and yes I had stimbling (felt like stall @ full throttle off the line, but if I gradually gave it throttle I would make it about halfway then stumble again. I ended up taping shut the vents and about 3/4 of the bored out intake box inlet - then the stumble went away. Im guessing I need to up the main jet one more, then take off the tape of on the intake airbox inlet again and give it another test. |
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Post by chanito on Mar 31, 2008 19:22:24 GMT -5
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Post by Dandy Dan on Mar 31, 2008 21:40:09 GMT -5
 Why people does not invest on an idle mixture tool and adjust the carb properly before start messing with the jets I think it's because changing the jets is much more black and white whereas adjusting the idle mix requires more effort. It's easy to say your lean and go up a size but it's harder to get a tach and try to set the mix right. Am I wrong in thinking that the idle mix adjustment really only signficantly affects the idle? So if I can get my scoot accelerating well and cruising with a good mix then I can ignore the idle mix? The new carb I put on my beluga has a whole bunch of screws that I have no idea what to do with so I'd prefer to stick to changing jets if I can. |
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Post by scvmarcus on Apr 2, 2008 2:21:00 GMT -5
The sparkplug pics over on TotalRuckus were mine, I figured I would install my bigger jet first (since intake modified and stock jets wont suffice), then adjust mixture.
Well jets installed, will adjust mixture when tool arrives
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Post by scvmarcus on Apr 2, 2008 2:23:42 GMT -5
Why people does not invest on an idle mixture tool and adjust the carb properly before start messing with the jets I think it's because changing the jets is much more black and white whereas adjusting the idle mix requires more effort. It's easy to say your lean and go up a size but it's harder to get a tach and try to set the mix right. I'm all for the mixture, As I mentioned I modified the intake, was running very lean to I installed the Jets first, was going to hit the mixture screw next. I didn't think adjusting the idle mixture screw first would work out based on the readouts from my meters, so wala jets installed first =) |
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