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Post by jomama0867 on Feb 26, 2023 6:58:02 GMT -6
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Post by jomama0867 on Feb 26, 2023 6:56:38 GMT -6
I recently decided to upgrade my 139QMB BBK from a 47mm to 52mm cylinder and head. After installing, I discovered a noticeable drop in compression. My question is this . . . has anyone seen a piston with this surface (on the left)  |
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Post by jomama0867 on Mar 20, 2022 7:57:23 GMT -6
Hard to tell without visuals, but it sounds like an "optional" plug used for alarm systems (most scooters have them)!
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Post by jomama0867 on Mar 20, 2022 7:49:55 GMT -6
That is DEFINITELY part of the "exhaust emissions" system. I wish I could help you hook them back up, but honestly that system is the FIRST thing I remove after acquiring a scooter. Unless you happen to live in California (or some other state that requires emissions tests for scooters), that system will end up causing more headaches than you can imagine . . . everything from vacuum leaks to full canisters of crap that keep your scooter from running (not to mention the costs of replacing those cute little containers)! IMHO
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Post by jomama0867 on Mar 20, 2022 7:42:36 GMT -6
As some of you might know, my "hobby" is to rescue GY6 scooters from people who just want them GONE! My latest is a 2008 JCL 150 that was easy enough to get running, but the speedometer stops travelling at 35MPH. Before I disect the poor thing again I'm hoping that someone out there has seen this before (wheel sensor, cable, etc.)?
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Post by jomama0867 on Oct 23, 2021 6:10:34 GMT -6
Almost sounds like shaft bearings (inside the case, NOT the clutch). That would also explain the rear wheel issues.
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Post by jomama0867 on Oct 23, 2021 5:58:49 GMT -6
DEFINITELY check compression. Blender noises are ALWAYS bad! My guess is you won't even need a guage; just hold a finger over the plug hole and crank. Probably would be a good idea to change the oil and look for "sparkles" also.  |
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Post by jomama0867 on Oct 23, 2021 5:39:58 GMT -6
The only time I encountered that problem, it turned out to be a single broken clutch spring (1 of 3). That one clutch "shoe" extended enough to move the bike at idle!
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Post by jomama0867 on Apr 8, 2021 13:25:16 GMT -6
Are you talking about the handle under the left grip? If so, that inserts a steel bar through the "tilt" function of the front end. The warning light and alarm are there to remind you to disengage the handle before riding. If you have not disengaged this handle and have ridden, you discover IMMEDIATELY that turning with just the handlebars is VERY DIFFICULT!! Additionally, your ability to maneuver the trike is SEVERELY COMPROMISED and possibly DANGEROUS (trying to avoid road hazards, potholes, debris, etc. is almost impossible)!
My opinion, embrace the tilt function of your trike! It took me several trips around town to get used to it, so I understand the reluctance, but believe me when I tell you that the tilt-and-turn maneuvers are CRITICAL!
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Post by jomama0867 on Apr 7, 2021 21:59:38 GMT -6
If you have an O'Reilley's near you, most of them stock fuel cut-offs in their "small engine" area. I just zip-tied mine to the frame.
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Post by jomama0867 on Apr 7, 2021 18:28:04 GMT -6
I've been riding a Sunny reverse trike for over a year now (the 50cc version, upgraded with an 80cc BBK), and solved the "shakes" problem the same way. Just like an old car, alignment is EVERYTHING!! I mainly use it to go to the local convenience store, mailbox, etc. I also agree with the ride height being too high! I found shorter shocks for the rear (too short, it turns out, so had to fab extensions), that lowered the ride height 2 inches . . . PLENTY! My only regret now id that it's still only 80cc's. I'm wanting to convert it to a 150/180cc. As most of us know, 139QMB's mount to the frame from the bottom of the motor, 157QMJ's from the top. Anyone have any suggestions?
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Post by jomama0867 on Jan 22, 2021 23:48:08 GMT -6
FYI - UPDATE:
The OEM tach. on these things is wired in with the "run" wire to the spark coil!! I couldn't figure out EXACTLY where they join, so I ran an isolated wire from the tach to the coil, and PRESTO!
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Post by jomama0867 on Jan 22, 2021 23:40:04 GMT -6
It sounds to me like a stator problem. The wiring harness coming from the stator is a mixture of both AC AND DC currents, and if they become brittle, worn or chafed, they can cause all kinds of trouble for the R/Rs!
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Post by jomama0867 on Jan 22, 2021 23:14:09 GMT -6
If that is the ONLY line coming out of the intake manifold, it is a vacuum line which should connect to the top end of the carb.
If the manifold has TWO nipples, one goes to the carb., the other ties into the EMISSIONS CRAP (unless you live in California, my advice is to remove all of that useless crap)! Just plug the lines (I use screws / bolts).
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Post by jomama0867 on Jan 22, 2021 23:01:58 GMT -6
Hey Guys 'n Gals. I've had my Sunny DF50 reverse trike for a little over a year now, and believe it or not I really haven't modified it that much . . . besides turning it's 50cc motor into an 80cc motor, that is! Anyone who knows me would really be impressed by my self-control. That said, it's really just not fast enough anymore. Since moving to rural Arizona, I've found that most roads around here have a 45 MPH speed limit. The "frog" (what I call my scooter) will actually do 45 MPH, but that's wide-open full throttle ALL THE TIME, and after 20-30 minutes of riding time it CAN'T be good for the motor!
I've heard of people trying to convert these over to a 150cc model, but as we all know the 150's mount from the top of the engine and the 50's mount from the bottom! Most people attempt to weld the upper motor mounts to the 50 frame, but I've not heard of too many (if any) success stories. So here's my project . . . find a 150 frame (preferably with front-end damage), cut it through the "foot" panel, cut the "frog" in the same area, and weld the front of the "frog" to the rear of the 150 frame. This way, I'm actually preserving the original rear end (motor, suspension, etc.) of the 150 and still keeping the front end of the "frog" intact. I'm thinking of adding a "skid plate" between the two frame sections underneath for added strength!
I guess what I'm looking for here is some constructive feedback from you "gurus"! Please don't be afraid to tell me I've lost my mind. It would be much easier just to buy a larger model (Sunny actually produced a 300cc and 600cc version of this), but I can't find a used one for sale, and I REFUSE to buy any of these scooters new!
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