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Post by scooter on Jan 14, 2015 21:20:48 GMT -5
Mega dittos from me also. This is a really good thread. Any updated numbers? Not for that scoot, but I just uploaded a new video and readings for a scoot that is not running well. It looks like the vacuum and fuel pressure are low. I wonder if the pump is leaking vacuum. |
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Post by scooter on Jan 14, 2015 21:18:17 GMT -5
Wow awesome video! I think it was starving for more fuel when it was cutting out..just my guess..I would try a better pump or electric pump,,the stock pets are junk if your running one,,also just gravity feeding can get iffy especially at those R's. I want to get an electric pump and also a better tach than the stock one.. Thank you. I think it's fuel starvation too. I went ahead and ordered an electric pump. RCQ twisted my arm. It was cheaper than a vacuum pump of this size anyway. |
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Post by scooter on Jan 14, 2015 21:15:02 GMT -5
scooter Thank you for the video. Very interesting results and great example of what is happening in the vacuum system. jerseyboy I was thinking the same thing. The reason I haven't switched to a gravity feed system yet is the task of remembering to turn on the fuel before every ride. But with an electric pump I could also install a toggle switch. But once you start down the road of gauges and switch, how far is too far?  I'm just using my gauge at the shop but that's cool! I think a vacuum activated relay might be nice for an electric scooter fuel pump but the ones I have found are not cheap, except for the ones made for furnaces, and they may work. That would mean a simple circuit from the battery or ignition, to the vacuum switch, to the pump, to ground. RCQ's pump comes on via relay when his key is turned on. |
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Post by scooter on Jan 14, 2015 19:41:22 GMT -5
That Geh, he's a trooper! He is a tough dewd man,,tougher than me,,thats for sure...today was kinda warm compared to the days he was out.. The coldest I've been out in is 48 degrees. That was pretty easy with a full face helmet, track pants wind breaker over my jeans, and a warm jacket on. I want to try some cold weather but you know, what with Global Warming and all, it's in the 70s here most days, and in the 60s in the mornings.  My new vacuum and fuel pressure test is up and the video is up too, if anyone wants to look at it. |
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Post by scooter on Jan 14, 2015 18:55:35 GMT -5
Man I cant wait till it warms up a bit,,i was frozen solid in just 2 miles,,dont know how the heck Geh does it  That Geh, he's a trooper! |
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Post by scooter on Jan 14, 2015 18:50:52 GMT -5
Hey people! Howz everyone? This weekend I'm looking into buying either a 2002 Honda Silverwing 600cc with 5900 miles, or a 2006 Kymco Grand Vista 250cc with 3600 miles. They are both nice scooters that have been taken care of really well and they both look nice. I know there's a vast difference between a big 600cc scoot and a 250cc, but I'm torn. The Kymco is only $1500, and the Honda is $2600. The Honda is a twin cylinder powerful bike, almost a full on motorcycle, but it's 13 years old now. The Kymco is 4 years newer, but less powerful. The Kymco has the benefit of being smaller, more nimble, and probably a lot cheaper to maintain and fix. I hear good things about Kymco, but I know it's not a Honda. Someone please let me know what you would do with this choice. Thank you! I'm guessing the Kymco is more stylish than the Silverwing. I know the Honda is quality, at least my Hondas have been, and should need little maintenance. I'd want to drive both to see which one I liked best. All in all, I LOVE Honda motorcycles. I would probably get the Honda and take it on a cruise up to Georgia and back. |
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Post by scooter on Jan 14, 2015 17:54:12 GMT -5
The WOT sag you describe is typical of an incorrect A/F setting. AllleyOop has a great tutorial on how to diagnose. Think you may just need a different et. Not positive, but I seem to recall from last summer the vacuum I was reading was more in the range of 8-10psi. BTW: the quite low vacuum the GY6 produces compared to a normal (auto or larger motorcycle) engine is one of the reasons I decided to NOT rely on a vacuum driven fuel pump, but go modern (electric). Thanks RCQ. I think your electric pump is a good idea, and while I may put one on in the future, right now my goal is to learn to use instruments to tell me what is wrong with scooters, especially ones I may not be able to take out and drive under a load. I would like to see the pumps you and Shannon bought. I think I'll get one for diagnostics. I can use it to bypass the vacuum pump system to see how scoots operate with a known "good" pressure. If the engine works fine with the electric pump, I'll know for sure it's a vacuum or pump problem. It's not what I'd call a sag though. I get the feeling that the fuel level is going below the jet and then back up again, over and over. I am preparing to upload a video to YouTube right now. |
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Post by scooter on Jan 14, 2015 17:11:23 GMT -5
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Post by scooter on Jan 14, 2015 16:58:04 GMT -5
Yeah,, Im pretty new to these GY6 motors,,I guess I need to build some more trust in them,,7K just seems like its a bit too high for cruising long periods of time to me on one..especially in the hot Summer time. I was cruising around 5-6K all Summer at 40-45 MPH with my stock setup.My heavy sliders get me into high gear pretty quick and I like the lower RPM,,still had plenty of power to pull me up the big hills even at 5-6K. My goal is to get the RPM down to around 5.5k and cruise at 50 with some pulling power left,,its gonna be hard because their is no replacement for displacement,hopefully the BBK will help me accomplish that..probably not..lol I will probably get another motor this Spring and set it up with lighter rollers/sliders so I can run 7-8K cruising 50 or so. Will put this motor to sleep on the bench for a while..and see how the higher RPM works out for longevity.I know my stock setup would start blowing oil out of the breather if I ran 6K for long periods of time...might have just been a little over full. I was running 7500 all summer in FL on my gy6-150. The engine seemed to take it well but the CVT would get pretty hot. When I switched variators, I didn't have the power to pull the new one and my RPMs were low, even with very light rollers. I like to accelerate at 6500. I switched to the lightest sliders I could find and got good results. You can use fine variator shims to fine tune your RPMs too. |
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Post by scooter on Jan 14, 2015 0:45:07 GMT -5
Okay, I took some new readings, this time from a 2008 Qlink Commuter 250 Helix clone, and the results are interesting because this bike runs like crap at WOT. I will post videos and/or pictures when I can, but for now here is a list of vacuum and fuel pressure readings. These readings are on the stand. Fuel Pressure: 1.2 PSIG @ 2000 RPM 1.6 PSIG @ 3000 RPM 1.7 PSIG @ 4000 RPM 1.7 PSIG @ 5000 RPM 1.6 PSIG @ 6000 RPM 1.4 PSIG @ 7000 RPM 1.5 PSIG @ 8000 RPM When I open the throttle any more, the readings drop drastically until I let of the gas some and let it back down in RPMS, then it recovers and goes back up. Vacuum: 1 -5 INCHES Hg @ 1800 RPM Idling. Steady oscillation. 3 INCHES Hg @ 3000 RPM 3 INCHES Hg @ 4000 RPM 3 INCHES Hg @ 5000 RPM 3 INCHES Hg @ 6000 RPM 2.9 INCHES Hg @ 7000 RPM 2.9 INCHES Hg @ 8000 RPM 1-5 oscillating to 10 INCHES Hg and back, Goosing from idle to full throttle After hitting 8000 RPM on the stand, when I open the throttle any more the readings go to about 1 INCH Hg and the "jerking" begins with RPMS jumping up and down, as though the gas is coming on and off rapidly. I will note that I have not yet done a valve adjustment on this bike. I will also note that I seem to be getting poor gas mileage, about 45-50 mpg. I do not know what is standard for this fat and heavy 250 scooter. A cursory propane vacuum leak test revealed no leaks, however I was not thorough in testing. Now compare these readings with the readings below from my very good running gy6 150 scooter. fuel pressure 1.5 PSIG @ 1500 RPM 2.6 PSIG @ 5000 RPM 4.0 PSIG @ 7000 RPM 3.5 PSIG @ 8000 RPM vacuum(IN) rpm 11-15 INCHES Hg @ 1750 RPM steady oscillating between 11 and 15 inches 11 INCHES Hg @ 4500 RPM 6 INCHES Hg @ 5500 RPM 4.5 INCHES Hg @ 6500 RPM 3 INCHES Hg @ 7000 RPM 1.5 INCHES Hg @ 7500 RPM 1 INCHES Hg @ 8000 RPM 0-20 goosing. goosing the throttle at idle makes vac go from 0 to 20 then back to 11-15 oscillation Here is the video. |
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Post by scooter on Jan 13, 2015 19:38:25 GMT -5
howdy, i recently got another of the harbor freight lifts like op pictured. the first was great but this one wasn't assembled well and i'm having some issues. the usual issue is trying to lift the max and coming to the end of the ram travel then pushing the seal out by trying to go higher. don't do it. still, i really like getting the scooters up cause i have such limitations that even checking the tire pressure is a painful struggle without it. my honda shadow front wheel is gripped by the wheel gripper well enough to get the fasteners on before it falls over. that's good. the bv, i just put on the center stand and it works fine. all in all, i think it's an ok addition to the shop and can be used for a work bench even without the scooter on board. ken The first thing I did was to jack it all the way up. After thinking it over, I have been keeping it low, and sitting on the safety bar. That takes the strain off of the jack and I think that's how it's intended to be used. |
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Post by scooter on Jan 13, 2015 19:35:14 GMT -5
Me too. I think I'm in luv!  I bouuht one Sunday morning...last day, of the 3 day January Blowout Sale. Like you I've wanted one for a while now.....and at $295.76, I decided that the time was right. The one I bought is item #68892, which according to discussions on other forums, is a bit more rugged than the newer model...item #69904. Instructions say to check oil level in pump....Mine needed somewhere between 6 and 8 ounces to top it off. Used a veterinary syringe and some tractor hydraulic fluid I had under the bench. Like dmartin95, don't know if I'd put a 1000 lb bike on it....considering that is it's maximum rating. Won't worry a bit lifting my 600 lb, 1200cc BMW's. (Scoot is on the lift now...."Schultz" and "Dooley", my BMW's, will get their turn before spring...will update if I have a problem with it) If I had a 1000 lb bike....I'd want a lift capable of at least 1500 lbs. Alright! Good for you, Hillbilly! I agree about the weight on the lift. While engineers usually design things with a fudge factor, and the thing could probably hold more than 1,000 lbs, I personally wouldn't want to torture my lift like that and I'd probably be a little scared to sit next to it with 1,000 lbs on it! I like the way they did the three way support pieces on the lift arms. It makes the two thin side pieces stronger without adding a lot of weight. I like the safety bar too. Aside from the quality of the bottle jack, my only real concern is those tiny cheap looking front castors. If one broke, it would be ugly. I keep those front screw stops just one turn off the ground. That is I make them touch the ground and then back them off one turn. That way the lift wouldn't fall too far if a castor broke. I hope it's well engineered. If it is, it will be fine. |
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Post by scooter on Jan 13, 2015 5:10:24 GMT -5
Yup, Yul WAS the head guy of the Magnificent Seven. He's one of my all-time favorites! He made being BALD cool, way before "Kojak"... Heyyyy, WHO'S YOUR DADDY? Telly Savalas was a mighty macho bald guy, too! Leo (leavin' too much hair inside my helmet these days) in Texas He was Terminating before Terminating was cool too!   |
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Post by scooter on Jan 12, 2015 21:38:46 GMT -5
I wouldn't have thought of that. MacGyver lives! |
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Post by scooter on Jan 12, 2015 21:37:04 GMT -5
We were a large CFMOTO dealer before they got out of scooters. Send me an exact list of what you need and I will check my inventory and get back to you. parts@carolinafunmachines.com Done. Thank you. |
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