Clinician
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Post by olblindman on Jul 17, 2015 7:01:52 GMT -6
Finally took it out for a run. Pushing 35+ mph at about 7600 rpms. I have the idle set at around 2400. The 8 gram weights and the larger pilot jet, along with PROPER adjustment to the air/fuel made a good improvement. If I could find a run enough flat run, I think she would top out near 45, but not likely to find one here! I also added an oil catch can, as most of the time I am running at full throttle.
I got this thing for about 800 brand new in '08....and probably have come close to spending that much to make it run nicely! It has lots of torque now (a necessity with all the hills here), and it isn't so snail-like in speed. We are now required to register these in NC, and they aren't supposed to exceed 30 on a flat......
Thanks again for the help, folks!
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Post by olblindman on Jul 16, 2015 7:40:29 GMT -6
The valves were right on, as I thought they would be. The air/fuel screw adjustment was out way too far, and I did change the pilot jet up a size. I think it is more in the ball-park now, as the air/fuel screw is out about 2-1/2 turns, and it is idling very nicely, and the idle speed adjustment screw has plenty of room for further tinkering. I have yet to take it for a drive, as I haven't had time to put all the body panels on(one can only do so much before going to work!) I have a set of 8 gram sliders on the way, but as I do not remember what I have in there now, I do not know what sort of difference it will make. At least now I will have a starting point!
Thanks again!
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Clinician
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Post by olblindman on Jul 12, 2015 18:00:54 GMT -6
Yea, I will recheck the valve adjustment first. I tried turning up the idle adjustment, but it got to the point where it was all in ( over a few days).It might have gotten to the point where the clutch was engaging, thereby bogging her down. I am also going to re-adjust the fuel/ratio after the valve adjustment. I may be mistaken on the RPMs...I was going by what the max rpm on the tach read at shut-down.....that may have occurred on a down-hill. The sliders are easy enough to replace, but I do not know what weight I have in there now......May have to be a bit of trial and error there. Once again, thanks for the advice! I will iron out all these bugs sooner or later. I won't be able to play with it much til the end of the week, due to work, and life......
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Clinician
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Post by olblindman on Jul 11, 2015 16:46:27 GMT -6
The big bore kit was done about 75 miles ago...the scooter only has about 300 on it. The valves were set right then. I cannot imagine them being way out so soon, although not impossible. They were set to .003. I remember this as my feeler gauge still has the .003 sticking out!
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Post by olblindman on Jul 11, 2015 12:02:48 GMT -6
OK. 139qmb with 72cc big bore, stock CVK carb with .88 main. Starts right up, revs up to 9700 WOT with no load, and 8600 WOT with my big butt on it. "Tuned" exhaust, unrestricted CDI, performance coil, free flow air filter, supposedly performance cam, Dr Pulley sliders (Don't remember what weight) and performance variator, 2.88 final drive gears, and new clutch with 1.5k torque spring, and 2k clutch springs. Top speed on a flat at 8600 is reading 35 mph (give or take---flats are hard to find, and short lived around here, and speedo errors are common on these cheapo jobs). Climbs hills very nicely now.
After a run, she will not idle. She just gets slower and slower, until she stalls out. I can give her the goose, and she'll keep running, but it should idle, no? Should I jump up a size on my pilot jet, and should I be seeing more top end with what I have? I have a .92 main sitting in my garage, and if I am changing the pilot, I can change the main, but I do not know if that is too much gas for a 72cc bore,etc.
Thanks in advance for any help!
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Post by olblindman on Jun 29, 2015 18:39:39 GMT -6
Thanks. I have ordered the tach, and will install as soon as possible. As a point of reference, what sort of r.p.m.s should I be seeing at WOT? This forum, and you, have been very helpful to me. I really appreciate it. Scooters and motorcycles are 'new' to me......I have always been a sports car sorta guy.
Thanks again!
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Post by olblindman on Jun 29, 2015 6:40:06 GMT -6
My scooter does not have a tach, so I do not know what RPMs I am pushing. The speedo may also be inaccurate (it IS a cheapo Roketa), and I am unsure of what Main jet I have. I know it is visibly larger than the stock.... and I do not recall the weight of the sliders.....
Also, find a flat around here is almost unheard of...nearly everything is up, or down to some degree.
How difficult is changing out the tranny gears? I am mechanically inclined, and did the big bore kit (Hell, I used to own a Jaguar XK-E ....one HAS to be able to fix things!).
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Post by olblindman on Jun 28, 2015 16:06:12 GMT -6
OK Quick update...I remembered that I did change the main jet in my old carb....I do not know what size though. I put that jet in my new carb, and it is running MUCH better...not lagging. I am still topping out at around 30-32 mph, but I do not know if I should be getting any better than that. I am sort of a big guy...205 lbs. I did also change the CDI,the exhaust, air filter, and the cam was supposedly a performance model, but it looked identical to the stock unit. If it is different, it is just slightly different.
So, my question is can I get a few more mph out of it (without spending a fortune)and how....bigger jet? Better carb?
Down-hill she'll do 45 no problem..uphill 20-25. We have lots of hill here in Western NC!
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Post by olblindman on Jun 28, 2015 12:58:07 GMT -6
I am having a similar problem. My scooter idles fine, and revs like crazy with no load, but as soon as there is a load, it bogs down. It has a new carb, fresh gas, fresh oil,and it has bumped up to 72cc's (2 years ago, ran fine, but never had much top speed increase, just more torque). I have played around with the carb adjustments, and nothing seems to make much of a difference...it continues to 'bog down' under load.
I would like to re-jet the carb at some point, but want it to run relatively correct first. I also do not know what size main jet would be the proper choice for more speed. It also has Dr Pulley sliders, but I forget what weight I used. The scooter has less than 300 miles on it.
I only used it to go to and from work for a short time, and would like to use it again.....
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