New Rider
Currently Offline
Posts: 10 
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 6, 2013 22:47:13 GMT -5
Well, I checked the timing, the chain, the cdi replaced, the carb cleaned, the ignition coil replaced, check the transmission (clutch and variator) and still can't figure out what is wrong. I am going to have to bring it to a mechanic cause I need it... this is gonna be painful paying 2-300 for someone to fix something I could do myself if I knew what the was wrong with it. I will update you guys with the results after.
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 5, 2013 23:00:30 GMT -5
So ya, I had the same problem and now my scoot is out of commission. I think the valve adjustment is the correct thing to do (I will tell you for sure tomorrow). If you fix other things and it stops surging but is running rough, it could be a deeper problem with your timing. I would suggest adjusting valves, fuel/air screw, and seeing how it runs. Valves are probably the number 1 reason scoots sputter after the Carb's anyway.
Good luck and let us know
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 5, 2013 10:16:49 GMT -5
Just broke down on me  I heard a pop and then it shut off.. It cranked again with no whirring but then shut off again. Now it turns over but won't catch. I think when I had my BBK put on the tensioner may have been loose. Do u think it could be my timing chain slipping off? |
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 5, 2013 1:12:12 GMT -5
not sure when I clean it sunday I will check it out, I never noticed it so I am guessing plugged, but I haven't specifically looked so I have to check it out - It sounds better on the video I think when I am driving it that whirring gets louder with higher rpms.
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 5, 2013 1:05:47 GMT -5
That was my thought, the only way I am replacing transmission stuff now is if it is obviously an issue there (I.E. the belt is worn, the clutch is causing the sound etc...)
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 5, 2013 1:00:59 GMT -5
lots of questions let me try and get the answers in order.
1. MM is 1-8mm carb (can't type 18 cause it gives the emoticon) I thought about upgrading to a 20 but am not sure yet) stock jets.
2. Idle I have to adjust based on the day , it is currently about 1 full turn but it doesn't matter how far I turn it , it won't maintain idle.
3. Yes I give it gas when I crank as it will die immediately after cranking (see the not maintaining idle)
4. I can check the float on Sunday when I do all of the other stuff (It should be very loose correct?)
5. I am debating replacing the variator with a performance version utilizing 8g rollers -- and if I do that I need to replace the clutch and springs as well as the belt (might as well do it all at 1 time)
6. the head is a 50mm (64mm valves) 80cc BBK -- the kit had the cylinder, head, piston and all gaskets necessary
7. It is hot as balls where I am but just now cooling down (Texas)
I have a feeling it is the carb/cdi for the idle issue, but I have no idea what the sound is... Sunday I planned on cleaning the carb, replacing the cdi with a performance CDI, Replacing the coil with a performance coil, replacing my NGK spark if it needs it, adjusting the valve timing, and opening up the transmission to inspect the components and replace if necessary. This is all based on what we talked about. Can you think of anything else I should try?
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 4, 2013 23:55:39 GMT -5
Vimeo sucks apparently -- I uploaded it to youtube and it is already up.
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 4, 2013 23:31:32 GMT -5
I did not upjet the carb, I don't think that is the only problem but I could definitely fix that one easily. I will order the new jets (both of them need replacing i assume) tonight. They are only like $5 each
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 4, 2013 22:37:04 GMT -5
Quick video of sound (it will be ready in 1 hour around 11:30pm from converting)
|
|
New Rider
Currently Offline
Posts: 10
Likes: 0
Joined: Oct 4, 2013 21:27:03 GMT -5
|
Post by gearhead on Oct 4, 2013 21:50:44 GMT -5
So let me start off and say that I don't know a lot about scooters but I am definitely learning and fast. It all started 3 months ago when I bought my first 50cc scooter. It already had a big bore kit on it (100cc) and would climb to 50mph at full rev even with my 220lb frame on it. All was happy until it seemed to overheat one day (I normally take it on long 30+ mile drives about 1 time a week and avg about 12 mile round trip the other days -- which I never keep it max rev for very long on.) I took it to a shop and they said I had NO compression and needed to replace my cylinder, head, piston. Well as they were trying to overcharge me I decided to have them do the service but I provided the hardware and bought an 80cc big bore kit. This worked very well and then I noticed a sputtering occasionally at high rpms and an occasional loss of power. I cleaned the carburetor myself and it stopped losing power but the sputtering continued. After about 2 days it stopped sputtering but then I lost power again. I change the oil every 500+ miles and I recently changed the gear oil (2 times now because I wasn't sure about it the first time  ) because it was recommended at 3500 miles and my scoot has just over 4k on it. So trouble shooting all of these, today a new problem occurred and I am at wits end. There is a whirring sound as if a belt is loose (I plan on taking the transmission case off on Sunday to check and see if I can identify problems with the clutch, variator, belt. Actions that I plan on taking because I have no idea what could be wrong -- 1. Replace CDI, Coil, and Spark Plug (NGK brand) -- I heard that the CDI could cause a loss of power and bad gas mileage which I have been noticing this week 2. Take off the cover for the clutch, variator, belt and inspect while running (if I can get it to idle and not die) 3. Check the valve timing (thanks youtube videos) because that may be causing part of the issue Things I know --- I don't have a lack of compression. After about 5 miles I can get back up to normal speeds but the first 10 minutes I can barely get up to 25 mph on max rev My oil has been changed recently as well as gear oil The Cylinder/Head/Piston are relatively new (less than 1k miles and yes I did the break in period for the first 400 miles) There is a whirring noise that started today (if I can't resolve it based on your suggestions I will take a video on my phone and upload it as that might help narrow it down.. training all day tomorrow so I can't then). I am at wits end and need my scooter to get to work on monday so I don't want to put it in a shop and would rather fix it myself Thanks in advance |
|
