|
Post by SMALL CC TEK on Nov 9, 2019 22:20:53 GMT -5
Shut down more of the Air and see if it takes off . Your valves are bit lose but one issue at a time ! lol
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 8:41:13 GMT -5
Shut down more of the Air and see if it takes off .  Your valves are bit lose but one issue at a time ! lol Thanks man. This is the value of video. So I placed my needle in it's highest setting and bam, it started working properly. Now I've been running 92-94 main jets, does that mean my main jets are too rich? I just don't have a lot of top end speed, it's actually some slower then the original 50cc set up. I'm pretty sure I got my valve lash at .004, and it starts and idles and apply power properly, so I am assuming the cam is set at tdc. Could exhaust restrictions be in play now? I've heard that the stock ext. Is fine for 47mm big bores. I am topping off at around 30 mph. Is it a break end period with the new valve head? Or am I just still over jetted? What a project this has turned into! 🤣
|
|
|
Post by scooterted on Nov 10, 2019 10:38:34 GMT -5
You can do a plug chop to determine where you are with main jetting.
Unless you're that far out with jets i would expect you to be moving a little faster than that. Im not really familiar with restrictions as ive never run into them myself.
Hows your cvt setup? Max rpm, belt travel, etc.
I would tighten the lash up a little. It would baisically give a teeny bit more valve lift and duration. Go ahead and recheck cam timing while you're there.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 10:57:30 GMT -5
You can do a plug chop to determine where you are with main jetting. Unless you're that far out with jets i would expect you to be moving a little faster than that. Im not really familiar with restrictions as ive never run into them myself. Hows your cvt setup? Max rpm, belt travel, etc. I would tighten the lash up a little. It would baisically give a teeny bit more valve lift and duration. Go ahead and recheck cam timing while you're there. The cvt and belt etc setup are all stock 50cc, the bike is brand new I picked it up in August, so I can check the cam tdc, but I have a quick question, I had to install a new chain tensioner when I did my bbk, the new chain tensioner didn't come with a gasket and I lost mine so I just used a bead of TVP to act as a seal, is that fine? Becausee ill have to pull the chain tensioner off to adjust the cam setting. Just wondering. The Valve lash and if I'm off a tooth or two could be the reason I'm slower. I need to get this done by end of business tomorrow because I'm sick of having to bother my wife with taking me to work.
|
|
|
Post by scooterted on Nov 10, 2019 11:15:38 GMT -5
Theres probably going to be gains to be had tuning the cvt. There are possible cvt restrictions. But im not familiar with them.
Gasket maker is fine.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 11:40:06 GMT -5
Theres probably going to be gains to be had tuning the cvt. There are possible cvt restrictions. But im not familiar with them. Gasket maker is fine. Yeah I figured. That's the next step in the process. Going to do a oil change tomarrow, and back to work Monday. I hear the trick is changing out the final gear. Something is still odd though I'll have to do another video later.
|
|
|
Post by scooterted on Nov 10, 2019 13:59:16 GMT -5
I dont think you're tuned enough for a final gear upgrade yet. I would expect you to reach at least 40 for that to be necessary.
I dont want to go over 40mph, so ill keep my stock gearing lol.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 15:25:41 GMT -5
I dont think you're tuned enough for a final gear upgrade yet. I would expect you to reach at least 40 for that to be necessary. I dont want to go over 40mph, so ill keep my stock gearing lol. Yeah I need to go back and check my cam timing and valve lash because it only gets up to around 7400-7600 rpm's and is topping out at around 20-25 mph, so something is way off. Can a out of sync cam by just a tooth or two throw off timing enough to do this?
|
|
|
Post by scooterted on Nov 10, 2019 15:58:21 GMT -5
Yes, very much. Cam timing is very important.
|
|
|
Post by Happypancake! on Nov 10, 2019 16:20:23 GMT -5
So here is a video showing what my scoot is doing, I installed a Tach to show the rpm and such. I have gotten it running, bit it's running pretty badly. Any help or advice would be appreciated, if you can help me get it running I have some chick-fa-la coupons on deck along with some other stuff! Thanks! Check your timing. Spark firing at the "F" mark.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 17:23:04 GMT -5
So here is a video showing what my scoot is doing, I installed a Tach to show the rpm and such. I have gotten it running, bit it's running pretty badly. Any help or advice would be appreciated, if you can help me get it running I have some chick-fa-la coupons on deck along with some other stuff! Thanks! Check your timing. Spark firing at the "F" mark. Yeah absolutely I think the timing is off. No way it should be running this bad. Ive had that feeling in the back of my head that yep, your timing is off some. Now you said the f mark, I've always bleeding lining up the T mark at the tooth, for TDC, am I doing that wrong?? I know the fly wheel mark is all I have to go off of short of pulling the head and checking the piston position relative to the flywheel mark, but when I started this project I noted that the cam and flywheel were both ing lining up, was running fine stock. I feel like I can trust the fly wheel mark but I'm open to suggestions. I really need to get this riding by Tuesday, I have tomorrow all day pretty much to work with this. Thanks again everyone.
|
|
|
Post by scooterted on Nov 10, 2019 17:43:06 GMT -5
T is for tdc. I would assume f is for spark (fire?). At this time, i cant remember what exactly is on my flywheel, but i know i use t for cam timing.
A foolproof method to find tdc. pull the spark plug and line up the t with the cam on the compression stroke, then GENTLY (and being very careful not to damage the cyl wall) place somthing long and strong enough that it cant get lost or broken off in the engine in the spark plug hole against the piston. Then GENTLY move the flywheel back and forth and use whatever you put through the plug hole to determine that the pistion is indeed at the highest point.
Some chinese scoots have been found with flywheels mis-machined, you probably dont have this problem. If you did, it probably never would have run well and you would need a new flywheel.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 10, 2019 18:09:50 GMT -5
T is for tdc. I would assume f is for spark (fire?). At this time, i cant remember what exactly is on my flywheel, but i know i use t for cam timing. A foolproof method to find tdc. pull the spark plug and line up the t with the cam on the compression stroke, then GENTLY (and being very careful not to damage the cyl wall) place somthing long and strong enough that it cant get lost or broken off in the engine in the spark plug hole against the piston. Then GENTLY move the flywheel back and forth and use whatever you put through the plug hole to determine that the pistion is indeed at the highest point. Some chinese scoots have been found with flywheels mis-machined, you probably dont have this problem. If you did, it probably never would have run well and you would need a new flywheel. Yeah I read elsewhere on the forum about this trick. Yeah I'm pretty sure my marked T is good on the fly wheel, I am also pretty sure my cam in 2 or 3 teeth off as well 🤣 this of course is most likely why it has no get up and go and is running goofy. I'm going to pull the valve cover tomarrow and chain tensioner, and that pain in the ass cooling shroud and start over with the cam. I am also likely overjetted and once the scoot is tdc I will likely have to drop the main jet down. It's something crazy like a 98 right now. It would be wonderful if this is the culprit and it suddenly starts doing 35 mph plus. It's the whole reason why I ditched the 33mm stock. I got traffic and a bridge to contend with here in FL and these drivers are crazy. If I can get a year or so of good solid driving ill be happy. Thanks man.
|
|
|
Post by scooterted on Nov 10, 2019 19:26:29 GMT -5
I wouldnt take all that apart right away. I would start with removing the fan shroud that covers the flywheel (4 or 5 bolts) and the valve cover (4 bolts).
If you need to adjust i would just remove what you need, that will probably be the top piece of the fan shroud (i would say just the cover with two screws but youll have to scrape the rtv that you used for the tensioner.
Check your spark plug gap while youve got it out also.
|
|
mikeh
Scoot Member
Posts: 59
Location: Bradenton, FL
|
Post by mikeh on Nov 11, 2019 8:09:16 GMT -5
Morning folks. Got my coffee and some Spotify classic punk and popped that valve cover. Holy crap. That can is totally not aligned correctly. The small top hole is canted left about 4-6 degrees from level with the head rim, I'm surprised it was running at all. Pretty embarrassed but also been a good learning experience.
Going to get this tensioner off, redo the cam and the valve lashing as see what happens. Quick this morning, I took others advice and just pulled the carb off at the intake and tied it up hanging from the back frame. Super easy.
Wish me luck!
|
|