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Post by rcq92130 on Aug 22, 2014 21:20:23 GMT -5
My idle isn't right ... but i have not been worrying about it because I have bigger problems. Have the idle set to 2200 or so (when warm; at more reasonable speeds the engine is too rough and often will stall. Probably too rich. Will get to that after i figure out the main issue.
Have very decent acceleration from start all the way to 45 or so, then OK to 50, then little more. Takes a good, long flat stretch to get to 55. From a traffic light I can easily outdistance all the cars (if course, they are not trying) .... so there is more than enough there. Just would like the top end to not be so pathetic.
Remember reading yesterday some guy with a 50cc bike is getting to 50 mph.
Feel pretty damned impotent!
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Post by geh3333 on Aug 22, 2014 21:24:26 GMT -5
We first have to take care of the idling , because if your running to rich this will cause loss of power near top end . After we get the air fuel right then we can go back to the cvt .
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Post by rcq92130 on Aug 22, 2014 21:35:23 GMT -5
But isn't the fuel flowing through the idle jet pretty inconsequential compared to that going thru the main jet anywhere near WOT? I mean - maybe my 115 jet is all wrong and i have way too much fuel spitting into the carb ... but i thought WHATEVER is going on in the idle circuit does not matter once the throttle is opened.
Wrong?
Oh - and speeds are as indicated. My speedo indicates about 3 MPH high, so actual speeds are, in fact, even a little lower.
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Post by geh3333 on Aug 22, 2014 21:43:38 GMT -5
This is one argued by many and it all depends on the type of carb , but alley will tell you that the air fuel screw has an effect thru out pretty much the entire range from bottom to mid to top . Others have confirmed this so I agree with what he says .
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Post by geh3333 on Aug 22, 2014 21:47:29 GMT -5
Why exactly are you running a 115 ? I need to be caught up on the mods you have done .
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Post by rcq92130 on Aug 22, 2014 21:54:43 GMT -5
a uni intake, drilled out (otherwise stock) exhaust, decent CDI, the variator with 1gr sliders. Have a large bore exhaust header arriving tomorrow (because you said the drilled out muffler was 'nice' ... but the tiny stock exh. header caused a lot of back pressure).
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Post by geh3333 on Aug 22, 2014 22:00:36 GMT -5
I would wait til u get the header on and then try to adjust the air fuel to idle near 1700 rpms . If you cannot get the air fuel right I would go with a 110 main jet . If you don't have one I might have one I can send you , I also have a good set of 9 gram dr pulley sliders I can send you if it turns out you need them . You will be able to mix them with your 11's to drop to 10 grams . Let me know and I'll get them out to you . I'll check on the jet right now .
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Post by rcq92130 on Aug 22, 2014 22:10:09 GMT -5
That would be great! Just let me know your email address (privately) and I'll Paypal whatever amount you want for them ... no problem.
Hopefully the header will arrive tomorrow ---- the exhaust I have is 1 piece end to end (welded) and the header has a flange at the muffler end, so I'll need to take it all to my muffler guy to get them attached. Will do that the first of the week (if the thing gets here tomorrow).
So just sit tight till then? That would be OK - the scooter is running good except for low top end speed ..
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Post by rcq92130 on Aug 22, 2014 22:12:31 GMT -5
BTW ..........
I ahve a windshield on this thing.
Added one because couldn't see anything with the wind .... and the people i read online claimed a windshield does not hurt top end (because it's 'cleaner', aerodynamically, than your body).
But maybe that's not true and the windshield is causing the problem. Easy to take off and check .....
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Post by geh3333 on Aug 22, 2014 22:17:51 GMT -5
Well I checked my jets and I have five extra , now I have a 130 , two 122 jets , a 102 and one that is marked as 132 but is smaller then the 122 and bigger then the 102 " which I'm not sure if the 102 is marked right ?" So if anything I can send you the 102 and the 132 , you can drill the 102 out to a 110 if you wanted to . It won't cost much to send so it will all be free .
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Post by geh3333 on Aug 22, 2014 22:20:32 GMT -5
BTW .......... I ahve a windshield on this thing. Added one because couldn't see anything with the wind .... and the people i read online claimed a windshield does not hurt top end (because it's 'cleaner', aerodynamically, than your body). But maybe that's not true and the windshield is causing the problem. Easy to take off and check ..... That all depends on how tall and the angle of the windshield . If it's almost straight up and down then it will only hurt , but if it's not that tall and angle back nicely it will help . |
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Post by geh3333 on Aug 22, 2014 22:22:52 GMT -5
The number 1 thing to take care of is the air fuel . If we don't take care of that first it could throw the rest off .
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Post by geh3333 on Aug 22, 2014 22:29:55 GMT -5
I'm gonna try to get some sleep so when that header comes 2mro we will get your carb tuned . I do want to say that if you have any concerns about what I'm telling you I promise alley will be the first to tell you to fix the air fuel problem first . Let me know if you want the jets and the dr pulley sliders .
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Post by rcq92130 on Aug 22, 2014 22:30:18 GMT -5
Mine is a 'classic" (Chinese Vespa style) so the windshield is pretty upright. It was originally very tall - hugely tall, but i and a friend cut it down (and cracked it a little in the process). Polycarb glue fixed that though. I'll take and post a photo tomorrow for your opinion, if you don't mind.
The stock carb had a 105 (which i still have). Then i got 3 from ScootDgs - 115, 120 & 130. I first read, 2 months ago, a scoot w/ free flow intake & exhaust at sea level should take more like a 130, so that's what i first tried. It was terrible. Then tried the 120. Not as bad, but the scooter still felt kind of lagging. So now there is a 115. Great acceleration, but weak top end.
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Post by geh3333 on Aug 22, 2014 22:55:16 GMT -5
I'm not sleeping yet so I wanted to tell you that I'm all for more fuel but without a better bigger ported head the 115 may be to big still , but we'll make that determination 2mro . Def post a pic I'd like to see the trimmed windshield . I couldn't get my scoot to idle below 2000 for a long time " I have a 32mm pumper carb " these carbs are known for running lean on decel and at idle , so what I did was cut about 1.5 to 2 coils off of the plunger spring on the carb and this allowed me to idle at and even under 1700 rpms by allowing the plunger and needle be raised a little higher at idle . It allowed for more throttle at top end " rather then no throttle after 3/4 of the way turned " I'm guessing the plunger wasn't topped out and the spring was holding it back and after shortening the spring it allowed the plunger and needle to rise higher . However I wouldn't mess with the spring on the regular cvk carbs .
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