Clinician
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Post by curmudgeon on Jan 26, 2016 20:01:10 GMT -6
Got the new jets and installed the 110. Worked a treat!
Now does an estimated 55-60MPH, no bogging, no flat spots. Very responsive. The intake bucket has 4 extra 3/4" holes in it, all opened up. It was cold tonight, so summer at 6500 ft may drop me to the 108 jet, but this was a great help.
Needle on center c-clip slot.
12 gram rollers gets 5500 RPM CVT operation. I'll try the 8 and 10 gram rollers when I get them, but I think the 110 jet and 12 gram rollers is a great place to be at 6500 ft.
6500 ft robs about 23% power from a sea level engine, so I'm really happy with this performance.
Thanks!
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Clinician
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Post by curmudgeon on Jan 25, 2016 18:24:00 GMT -6
I like nickel neverseize for axles on all my bikes. For High horsepower bikes I only use Honda Moly Paste on splines, but for this I'd think moly grease would be good enough. New to scooters, but have owned and wrenched motorcycles since 1970.
The most important thing is to never let it get dry. The more often you service it, the cheaper the lube you can use.
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Clinician
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Post by curmudgeon on Jan 23, 2016 15:36:25 GMT -6
Thanks again, I'll follow your advice when I get the new jets.
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Clinician
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Post by curmudgeon on Jan 23, 2016 12:12:20 GMT -6
Thanks again for your help.
The clip had been at the center setting. Moving the clip up on the needle made it run worse. So I moved it to the lowest position on the needle (richest.) That helped a bit.
Then I noticed that it appeared somebody had drilled the airbox. I stopped up all but what I think is the original hole and it will now run above redline on the center stand. It would only pull 4000 with my 220# butt in the seat. I'd ordered some 12 gram rollers for the variator - originals were 17.3 gram. I put the 12g rollers in and it now pulls 5000 RPM. Speedo is broken, feels like maybe 50 MPH? This will be a city commuter, so 50 MPH top speed is probably fine, but it's still anemic off the line with a flat spot at ~3500 RPM.
I'm thinking I need to get a bigger main jet - even though it's hard for me to believe the stock jet (105) is lean at 6500 ft. How big should I start with if I open up the other four 1" holes?
Any other suggestions?
Thanks again.
[Edit to add: You posted while I was typing. Thanks, I'll get a 108 and 110 jet.
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Clinician
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Post by curmudgeon on Jan 23, 2016 10:00:01 GMT -6
Thanks again for your help.
The enricher appears to work properly, and measures 15 Ohms. Air filter is clean. Runs the same when air filter is removed.
More info on behavior: If I get the engine up to 6000 RPM and it is in a steady-state sputtering mode and cover 3/4 of the air intake area, then it speeds up and runs to red line. If this was an old tractor or simple carb that would tell me the mixture is too lean. On this carb the vacuum operated main needle I'm not sure.
I don't have any other main jets, so moving the needle up and down is my only tuning option. I think it is close to maximum rich right now. (Clip lowest on the needle.)
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Post by curmudgeon on Jan 22, 2016 20:27:53 GMT -6
Ya caught me out, thanks. Too many diesels, lately. Checking compression with the throttle open gets 150 PSI, which is a lot better. Again, many thanks.
Will the idle mixture screw actually affect the high RPM mixture that much? I currently have it set 2 turns out. I'll try changing it. Pilot jet is 35, main is 105. It's a Keihin (sp?) carb. I don't know how better to identify it. Owners paperwork says 150CC, Kaitong, marked Velocity. I am at 6500 ft, owner lives at 6000 ft, so running rich is not hard to believe. Any jetting help appreciated.
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Clinician
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Post by curmudgeon on Jan 22, 2016 20:01:23 GMT -6
A lady at work asked me to check the brakes on her scooter.
Trailered it to my house and find out it hasn't been started or run for 3 years.
Replaced all hoses, replaced cracked air intake, cleaned the carb, removed the PAIR system, set the valve clearance. The exhaust valve had 0.150 clearance (!!!) and the intake had no clearance cold. Both now set to .005 cold. I'm an old farm boy and have done all my own maintenance on small engines including many motorcycles over the years, so I've rechecked everything twice, and pretty sure I've done it right. Everything but the PAIR looks familiar.
Motor starts and idles well now, but won't rev over 6500 RPM when on the center stand. I get mild popping above 5000 RPM. I also seem to be getting a lot of reverse flow back through the carb and air filter. Strong pulses out the air filter above 5000 RPM. A compression check shows 90 PSI, which seems low.
Is there something special I need to know about these engines, or does this scream "bad intake valve"?
I'd rather not dive any deeper than I have to...
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