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Post by jerseyboy on Feb 6, 2015 21:12:20 GMT -5
28 is probably big enough to supply all a 150cc engine wants. There is some discussion about a 30mm carb having no extra power in the last 1/4 or 1/8 turn of the throttle - meaning that last bit of carb size offers no benefit. On the other hand, i have yet to hear a rational explanation of what a 30mm, or 32mm carb - properly jetted - will not perform equally to a 28mm carb. Of course I may be wrong, but if not then the bigger carb may not help but will not hurt either. You know I noticed that on my 24mm before the BBK,,the last 1/4 bit of throttle had very little noticeable difference,,it was like 3/4 was really close to WOT,,you really had to pay attention to feel the difference.Im looking forward to see if that changed now with the BBK and a bigger jet. |
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Post by geh3333 on Feb 7, 2015 0:06:57 GMT -5
28 is probably big enough to supply all a 150cc engine wants. There is some discussion about a 30mm carb having no extra power in the last 1/4 or 1/8 turn of the throttle - meaning that last bit of carb size offers no benefit. On the other hand, i have yet to hear a rational explanation of what a 30mm, or 32mm carb - properly jetted - will not perform equally to a 28mm carb. Of course I may be wrong, but if not then the bigger carb may not help but will not hurt either. You know I noticed that on my 24mm before the BBK,,the last 1/4 bit of throttle had very little noticeable difference,,it was like 3/4 was really close to WOT,,you really had to pay attention to feel the difference.Im looking forward to see if that changed now with the BBK and a bigger jet. After I shortened the plunger spring I had better response at takeoff and at top end . but you may be onto something . its crazy the member I was helping used and equivalent to a 145 main in his 28mm racing carb ! My god that's a lot of fuel. |
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Post by jerseyboy on Feb 7, 2015 9:51:23 GMT -5
Yeah,,
I modded my slide so it would move up faster but did not mess with the spring...did you cut a wrap or so off to make it easier for the slide to go up in the carb,,if so how much did you cut off the spring?
I have an extra spring to play around with...
I hear that Harley guys take a one or two coils off their spring after modifying the slide,,but they dont really notice much difference unless they pipe and jet.
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Post by scooter on Feb 7, 2015 10:08:30 GMT -5
Yeah,, I modded my slide so it would move up faster but did not mess with the spring...did you cut a wrap or so off to make it easier for the slide to go up in the carb,,if so how much did you cut off the spring? I have an extra spring to play around with... I hear that Harley guys take a one or two coils off their spring after modifying the slide,,but they dont really notice much difference unless they pipe and jet. How do you mod the slide, Geh? |
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Post by geh3333 on Feb 7, 2015 16:45:19 GMT -5
I cut about one and a half coils off the spring . or should I say one and a half full turns down the spring .
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Post by rcq92130 on Feb 7, 2015 19:16:45 GMT -5
I had no idea you were stupid. I just thought you were a regular person who has come here to learn, help and grow in your understanding.
{shrug}. I would never have guessed.
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Post by JerryScript on Feb 7, 2015 19:33:56 GMT -5
Most responsive gy6 I've ever heard!  |
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Post by alleyoop on Feb 7, 2015 19:43:09 GMT -5
Yep, the way it spools up and down like there wasn't any kind of a load to contend with, spins the cvt and rear wheel like they weren't even there, that puppy has some power.
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Post by jerseyboy on Feb 7, 2015 19:46:42 GMT -5
Yep, the way it spools up and down like there wasn't any kind of a load to contend with, spins the cvt and rear wheel like they weren't even there, that puppy has some power. Im gonna try like heck too get mine to sound like that,,not too sure it ever will,,he has all that taida stroker stuff on it,,plus its a few mm bigger,,but I will try!! If you want to play you gotta pay$$. |
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Post by JerryScript on Feb 7, 2015 20:16:42 GMT -5
Yep, the way it spools up and down like there wasn't any kind of a load to contend with, spins the cvt and rear wheel like they weren't even there, that puppy has some power. Im gonna try like heck too get mine to sound like that,,not too sure it ever will,,he has all that taida stroker stuff on it,,plus its a few mm bigger,,but I will try!! If you want to play you gotta pay$$. It's the snappiness of the response that you want, and it doesn't matter if it's stroked or not. The instantaneous up and down of the RPMs in response to the quick blips on the throttle is the result you are looking for when adjusting your a/f screw. If it hangs after rising instead of dropping right down, you are too lean. If it hesitates rising, or drops down below idle when released and then rises back up, you are too rich. If you can't attain instantaneous response with a/f screw adjustments, you need to re-jet the idle jet. Note- always adjust your idle up about 500-700 rpms higher than normal while adjusting a/f screw, then lower to standard idle speed afterwards. Once instantaneous response when blipping from idle is achieved, and you don't have any bogging when accelerating through mid-high speed range (if you are, adjust the needle clip accordingly, or add/remove spacers), you can do plug chops to determine if your needle and main jet are properly sized and adjusted. Too white means too lean, coffee-chocolate brown is good, dark brown to black is too rich. If you cannot achieve a good plug color with needle clip/spacer adjustments, you need to re-jet the main jet. Finally, use slight adjustments (1/8-1/4 turn, no more) to the a/f screw based on response when you release the throttle 1/8-1/4 turn, if speed increases you are too lean, if the engine stumbles and recovers you are too rich . |
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Post by alleyoop on Feb 7, 2015 20:23:30 GMT -5
Yep, the way it spools up and down like there wasn't any kind of a load to contend with, spins the cvt and rear wheel like they weren't even there, that puppy has some power. Im gonna try like heck too get mine to sound like that,,not too sure it ever will,,he has all that taida stroker stuff on it,,plus its a few mm bigger,,but I will try!! If you want to play you gotta pay$$. Good luck Jersey, and your right if you want to play you have to pay..LOL just like in Vegas Money Talks Everything Else Walks. |
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Post by jerseyboy on Feb 7, 2015 20:54:27 GMT -5
It reminds me of my 1985 200X trike with pipe,,maybe a little meaner...lol
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Post by jerseyboy on Feb 8, 2015 11:46:43 GMT -5
Here is a quick video of it running after the slide mods,,its a bit snappier but not like that stroker...lol
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Post by alleyoop on Feb 8, 2015 12:29:02 GMT -5
Sounds good Jersey, you done a good job
Ride Safe,
Alleyoop
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Post by jerseyboy on Feb 8, 2015 13:27:04 GMT -5
Thanks Alley,,
I learned all about scooters from you guys,,so thank you and all the members of the forum who shared info with me.
Still going to put the NCY 3rd gen clutch and racing bell on,,also have some header wrap for the exhaust,,then that should about do it for this season....I hope
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..BAD TO THE BONE..