New Rider
Currently Offline
Posts: 16 
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Jan 1, 2019 11:49:47 GMT -5
Just wanted to update this thread .... I ended up junking the scooter after buying another used top end from a working bike online and having the same issue. Shame to see it go but I tried!
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Oct 22, 2018 22:04:21 GMT -5
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Oct 22, 2018 7:51:56 GMT -5
so it sounds like one of your valves is pitted or chipped My thoughts indeed point to a valve seating issue. I'll pull them again and take a picture for y'all tonight or tomorrow. |
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Oct 22, 2018 7:50:31 GMT -5
My thoughts indeed point to a valve seating issue. I'll pull them again and take a picture for y'all tonight or tomorrow.
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Oct 21, 2018 20:20:40 GMT -5
I was thinking the same, but I put the bike back together, tested for compression by spinning the fan by hand as well as using the electric start, and the needle did not even move. This was with the intake manifold (and carb) and exhaust bolted on. I feel air coming out of the exhaust, but no movement on the compression needle.
With your comment about something in the headset ... if I get spark, doesn't that mean the bike is indeed properly set to run and the ignition set to on?
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Oct 21, 2018 12:26:21 GMT -5
Hey y'all, Hoping you can shed some light on this issue. I was driving my '92 CH80 (4k miles) when all of a sudden it shut off and no longer started. Prior to that, I had ascended a steep grade at about 30 miles per hour and then went down it at about 45 mph. The rest of the way was flat, easy cruising at about 35-40 mph. It didn't shut off until 2 miles after, when I turned at an intersection. I slowed down for a STOP sign, accelerated a bit more, stopped again, and DEAD. I checked battery, spark, fuel delivery, cleaned the carb. A mechanic said I had no compression. Pulled apart top end, nothing seems broken or visibly worn. Piston is carbonized rings look fine. Camshaft, valve tappets, rocker arms, etc. all look good. Any ideas? My feeler gauge only goes down to .2 mm and valve clearance is supposed to be .05 so will check that next.   |
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Sept 20, 2016 13:49:59 GMT -5
Ok, well this morning the scooter would refuse to start up with that 64 jet. Figured it was too little gas, so I put on the 70 jet back. Ran OK, but still backfires and is sluggish until higher speeds. Should I try another jet or heavy torque spring?
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Sept 19, 2016 7:05:13 GMT -5
Hey everyone! I have a 2002 Vino 50 2T which had a Malossi 70cc kit installed. Ran great with #70 main jet and stock exhaust although acceleration was almost the same as stock until 30-35mph, when the powerband hit and the scooter took off through ~44mph.
I installed an MHR replica pipe and checked all nuts and bolts to ensure no air leaks. Acceleratoin got worse under ~30-35mph but when the powerband hits, the bike screams as it should and shoots up to 50.
Tried a #75 jet and got even worse acceleration and couldn't get above 28mph. Got the best results with the stock #64 jet but acceleration is still slower than stock.
Ideas? Too small a jet? Variator work needed? Thank you guys!
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Jun 4, 2015 16:36:47 GMT -5
The guy who sold me the scooter is a Honda mechanic and he suggested drilling a small hole in the gas cap to eradicate vacuum issues. Thoughts? How big a hole?
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on Jun 3, 2015 22:08:03 GMT -5
Thanks for the help so far everyone. Where can I buy and how can I install the fuel pump? It would make sense for fuel delivery to be the issue because sometimes I simply don't feel reaction to throttle action. I'll slow down to take a turn and then try to spring back to 40 mph from about 17 or 20 mph and it just takes forever, but not because I'm impatient. It takes forever because the engine is simply not working at WOT-like RPMs.
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on May 29, 2015 14:49:09 GMT -5
Hello everyone,
I will be checking up on the scooter again tomorrow at the local shop. It hasn't quit on me, but I haven't taken it on rides similar to the one where it produced an issue - don't want to produce another problem without a professional opinion. I now notice a weird vibration coming from the engine area that increases when idling and decreases when accelerating. I will post results from the work soon.
Thanks!
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on May 21, 2015 19:42:15 GMT -5
Hey so I pulled the spark plug and this is what it looked like. I believe it's erring on the side of rich given brownish decoloration, so although the symptoms pointed to leanness I believe the carburetor is actually fine. Could it be a fuel delivery problem? The fuel sending unit shows a small crack but nothing comes out even with a full tank. It's a gravity fuel feed, so maybe there's a vacuum problem? I replaced the spark plug with a new one, appropriately gapped and anti-seized on the threads; I'm going to go for another long ride and see what's up.  |
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on May 21, 2015 13:23:39 GMT -5
Pretty sure it's a 2-stroke, it doesn't have valves to adjust. Yup, 2-stroke with an oil pump so no pre-mixing is required. Scoot does it by itself |
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on May 20, 2015 16:23:14 GMT -5
Thanks for the suggestions, I will pull the spark plug tomorrow and check it out. What valves are you referring to?
|
|
New Rider
Currently Offline
Posts: 16
Likes: 1
Joined: May 20, 2015 8:33:40 GMT -5
|
Post by kyalami321 on May 20, 2015 8:47:47 GMT -5
Hey everyone,
I've got a 50cc Mojito that I purchased from a guy who installed a Leo Vince Touring pipe on it, adjusted the carb accordingly, and desrestricted. The scooter is wild fast compared to stock (as described on the Net), running through the powerband up to 35mph and then steadily accelerating to an absolute max of 52mph. If I've got wind in my favor, I can keep a steady 40-45mph with only about 1/4 throttle open.
The other day, I was on an empty street going about 41, 42mph steadily for 3.5 miles (as per Google Maps). At the end of those miles, the scooter cut out and turned off. I pulled over and tried to restart it with the electric start and kickstarter. No dice until about 20 minutes later, when it turned on and then got me home with no issue, although the streets from that point on were constantly interrupted by red lights.
Is my scooter overheating? During that long stretch, the throttle was only about 1/4 to 1/2 open; should I have kept it wide open in order to keep the cylinder lubricated?
Please help! Thanks, Tomas
|
|
