Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jul 8, 2011 16:52:22 GMT -6
As long as the vent line is attached to the air box vapor is all I loose but it was when I added the extra long hose that ran 2/3 of the way to the rear of my scoot that I started blowing large amounts of oil, now that that line is reconnected to air box all seems to be fine, not sure why adding the extra lond length of hose caused the problem but some how it did. engine was not over full of oil either, level was where it should be...shrug! ? not sure what caused that issue at all, I've been unprofessionally building and performance tuning small 4 smoker engines for 32 years and I've never seen this happen or know why, some sort of a vacuum must have been created some how in that hose for that much oil to get into it, the 7-8" line that runs to the air box stays basically dry other than just a film of oil that collects from the crankcase venting pressure. Oh well, I'll know not to run that hose like that again on this GY6. Peace If it is blowing that much oil you have another issue.. have you overfilled the oil level? There should just be oil vapor coming from the PVC hose.. any more and there is a problem...
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jul 7, 2011 20:18:14 GMT -6
The tube you are calling the vent tube is just another word that refers to PCV tube ( positive crankcase ventilation ) that is what PCV stands for, the steel tube you are refering to is the " emission control stuff they put on these to make them legal for some states from what I gather. My air filter box sit directly over the engine so oil will drain back into the engine if it is blown up into the small chamber where the PCV/vent tube is attached. I will post pics of the catch can I make for mine once I get it done, I plan to make it so any oil that gets in it will drain back into the engine and the pressure itself will be vented through a filter also. Thanks for all the input on this everyone..... Peace I never change the contra spring..waste of time and money.. the stock one is fine for 95% of riders.. You keep taking about the PVC tube.. do you mean the valve cover vent tube?? There is a PVC device on some engines, it is a silver 'U' type tube. Most people simply block these off . You can buy or make a small block-off from aluminum... The Vent tube comes off the top of the valve cover from a 90 degree elbow... it should never be blocked or you could have gasket and seal problems... Just stick the vent hose in a catch can or stick a fuel filter on the end and zip tie it high on the frame so the oil drains back into the cover... The filter should be checked every month or so, to be certain it passes air freely... If you have excessive oil you may have too much oil in the engine.. check your level. You should use only 750 ml in an oil change...
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jul 3, 2011 20:53:23 GMT -6
Yeah I know some blow by is normal but I knew something was pretty wrong when I lost about 1/2 cup of oil in a 5-6 mile trip, I have since put that PCV line back on the air box for the time being and then I took a 10+ mile round trip ride on the highway and things seem to be good now. I have been planning on making a catch can for a while now but just haven't had the time but it will be done asap. now I need to get my carb adjusted a bit better and get my clutch worked out, I put a ( Yellow ) 1500 RPM main spring in my clutch today and a set of 10g roller in the variator and that was a big joke......5000RPM at 30mph......! & only 48-50mph Top speed.. eek.! so then I put some 13g sliders in the variator and it lowred the revs at lower speed some but my top speed was still about 5 mph slower than it was with those same sliders and the 1000RPM main spring in the clutch, so I then put another set of rollers I had modified in th evariator 3 @ 17g & 3 @ 14g and now the RPM's are down but the top end is still off and it is a dog taking off.......I may put the 1000RPM spring back in and order some 12g sliders and see what that does to it. I might consider going with a higher set of gears like maybe an 18T pinion set up, then maybe could run the lighter rollers or sliders and not loose my top end speed...... ?? Peace Not sure I'm to impressed with that 1500RPM main spring in my scoot
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jul 3, 2011 17:47:16 GMT -6
Wish I could help you bud but I dont know much about the wiring stuff on these scoots, i've had a couple light issues myself and just regrounded mine today thinking that might be my problem, but I wont know for sure until its dark so I can see if my lights are going real dim sometime when I increase the throttle, I think I have or had something loose but like I said I dont know if mine is fixed yet or not..... The wiring stuff can be a real booger because you cant see the problem many times.
Good Luck I hope you get it figured out soon.
Peace
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jul 3, 2011 17:30:04 GMT -6
Well, as you can see by the subject title I have an issue of blowing oil when I run at WOT down the highway. Now I made some changes to the PCV tube by detaching it from the air filter box that is under the seat and running a 2 foot piece of 1/4" fuel line from the valve cover vent nipple and then I routed the hose toward the back of the scooter under the side panel and then it points down toward the CVT cover. I just came back from about a 5-6 mile ride which was mainly on the highway where I was running 50-55mph 6500-6700RPM most of the time, before I got back I slowed down and looked back at the CVT cover and it was completely covered with oil that has been spraying out of the vent tube, the reason I disconnected the tube from the air box in the first place was because the slight amount of oil that was going in the box was just saturating my air filter with oil over time and I wanted to eliminate that problem by venting the presssure and the oil out of the box. Obviously I have made my problem worse by replumbing that PCV tube....., I have included a pic of a possible fix I'm considering from scrappydodscooters.com, I'm wondering if this part will actually solve the excessive PCV problem I'm having. My engine only has 1840 miles on it and it never put out very much oil in the air box at one time or anything like that, but I just wanted to get that heat and oil away from my fuel/air intake but I can se that just a wide open yube hooked to that vent isnt gonna work at all unless I just putt around and I cant do that when I ride 16 miles on the main highway to work on this thing. My scoot is a Roketa MC74-150cc, and the engine runs very good, just rejetted the carb today to a 115 main jet, and made a couple more adjustments as well, but when I ran than open tube for the PCV I messed up and need a pros advise on the best way to resolve this issue without breaking the bank..... Thanks in advance fella's Peace Attachments:
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jun 25, 2011 6:03:06 GMT -6
Thank you sir I will do that, I'm not looking to go all out with my scoot but I would like to get a bit more pulling power out of it on top end, I live 16 miles from my work and 1/3 of that is actual highway driving before I get to town with a couple very minor hills, right now I'm topping out at 57-58MPH on the flat ( no head wind ) and I loose about 10-12MPH on those slight inclines, I want to pull through the wind a little better and do a bit better on those hills also.
I figured if I free up the exhaust a bit that should help some, I already put the Hotter Coil, (Orange) CDI, Spark plug, variator, 13g sliders on the scoot, all of this really hasn't made that much of a noticable difference maybe just a bit better low end take off but thats about it.
So looks like I need to get into things a bit more
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jun 24, 2011 20:17:12 GMT -6
I have a MC-74-150 Scoot and I would like to know what the stock jet size normally is in these GY6 150cc engines. I plan to put a better flowing exhaust on it and I know this will lean the mixture out some so I plan to rejet the carb. I have looked at the replacement jets and am not sure what to get since I dont even know what size these engine typically come with. Thanks in advance for any & all help on this. Peace Attachments:
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jun 14, 2011 20:03:56 GMT -6
No I havent done anything to it yet, found the problem at 5:00AM this morning before leaving for work, put in my 12hrs and wont be messing with it again until Thursday.........
when I hit the electric starter it just kicks right off just like it should, battery seems to be charging just fine, but I cant be sure of that yet.
That is a good idea about checking all the grounds though and this I will do Thursday robb, Thank you very much for the advice.
If I put a meeter on the battery and it is showing 13-14 volts while engine is running this should be a good charge rate correct?
I know it is on most 12v systems but I haven't messed with these scooters that much yet other than replacing stock parts with up grades.
Thanks, Shan
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Jun 14, 2011 19:27:45 GMT -6
Hello, been a while since I been here I have a MC-74 150cc Scoot and after I stared it to go to work this morning I suddenly noticed that my light started dimmimg and finally got to the point to where it looks like they are running on maybe half the voltage they need....... I have not had a chance to put a meter on the battery while it's running to see if battery is being charged but since the lights run off the stator I'm thinking that is the problem, scooter has almost 1,800 miles on it but it seems I remember reading that the stators are a known weak spot on these china scoots. Anyone with experience please give me your thoughts on this please. Thank you, Shan Attachments:
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 25, 2010 22:01:17 GMT -6
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 25, 2010 21:38:00 GMT -6
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 24, 2010 20:46:35 GMT -6
I'm very curious about this because I have a "humpity hump" as you so accurately described it that I live with to this day. I recently had some wheel weights fall off which helped quite a bit but it still doesn't feel quite right. I've learned to live with it but I would LOVE to have a completely smooth front end. Actually, when I get up above 59 MPH it IS completely smooth, and that's not real bright on my part. So what you're saying is this:
Have you looked at the hub face on to see if you can see an eccentricity? I've had my wheel off and never thought to look at it from the side and see if that was the problem. You could also put the axle on two jack stands and see what the wheel and tire does as you spin it. I think I'll pull the front wheel this weekend and take a look. Rich Yes I have spun the wheel while off the ground and it is very clear that the wheel hub is not centered with the outer rim, serious lope when it rolls ooops I mean "Humpity Hump" (^_ ^) LOL....! Mine also gets better at high speed.
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 24, 2010 20:42:01 GMT -6
I dont have to send in the bad wheel and If I were to buy on efrom them it would cost me $130.00 + shipping and I have found one for $65.00 somewhere else if it comes down to buying a wheel, I will just wait and see if they come through as they have said, I still have my scoot in ridable condition.
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 23, 2010 13:51:12 GMT -6
On another thread last night it was brought to my attention that www.scooterdepot.us has had some pretty severe complaints against them in the past in several different categories so, I said that I would no longer be promoting them on this forum although that is where I purchased my scooter from at what I thought was a great price and fairly quick shipping with no shipping damage and good customer service in my opinion. Now, I realized yesterday that the humpidy hump I have been experiencing with my scooters front end while running down the road was not a tire issue after all, I just had a new Michelin tire installed yesterday and after getting the wheel back on I notice very quickly that the jump in the front end had not changed and maybe even a little worse because there are no balance beads in the new tire, after closer inspection I seen that it is a bad wheel that is my problem, the wheel is not machined true in the hub, it seems that when the center of the wheel was machined for the bearings it was machined off center and this causes a cam-ming action when it rotates rather than rolling true, I leaned up over the front of my scooter while running about 25-30mph and there it was so easy to see the wheel has a eccentric rotation which gets the front end jumping very uncomfortably at 30-45mph. I made a short video of the wheel spinning while I had the scooter on the center stand and e-mailed it to Patrick the fella I had talked too last evening, he told me he would look at it and also show it to his Boss, I contacted him this morning and he watched the video while we were on the phone, he said he could see what I was talking about and his boss needed to see it before he could go forward, he contacted me earlier and said his boss watched the video and told him to get me a new wheel ordered for a warranted replacement, they said it may take up to 3 weeks for me to get the wheel but it will be ordered today. So......now it's the old hurry up and wait game, I will find out in the next few weeks if they are gonna shaft me on this or I will get good warranty service from them on it instead, wish me good fortune on this guys.......I got my fingers crossed here. If I had of known then what I know now I would have never ordered a scooter from someone who doesn't even stock the replacement parts for them, they force you into buying a $69.00 6 month warranty from them and then if you need something they have to order it from who knows where...! and you have to wait 3-4 weks to get the part. I'm hoping to get my wheel and then I'm done with them, I talked to one fella yesterday that told me they have not even had any of the model scooters that I bought from them in stock for over 6 months, (MC-74-150 Roketa) I said well thats funny I just bought one from you July 1 2010 @ 1:57 AM this year, he said hold a moment please and then that is when I met Patrick which is handling my warranty issue now, so it does seem they have some pretty uninformed people at the phones. For all that pointed me to the site listing complaints against them....Thanks Shan
|
|
Senior Clinician
Currently Offline
Hum...what can we do to the scoot today?
Posts: 187
Likes: 0
Joined: Jul 25, 2010 21:03:59 GMT -6
|
Post by mapbike on Sept 22, 2010 21:37:39 GMT -6
Wow.......! that is scary..... so far I've had no real complaints other than I have gotten put on hold for a long time twice while talking to someone, but that happens a lot so I didnt think much of it now days, but I'm very curious now about hem after reading that report, makes me think that I will be taking my business elsewhere now......! a couple of those bad reports were what I would consider simple issues made real big by people who dont know what a spark plug is, and truly I dont think these cheap china scoots are for those people anyway because these things are gonna have problems from time to time and one needs to have some mechanical skills or they would be better off just getting a better quality name brand scooter thats will be less trouble for them, now I'm concerned because I just realized today that my balance trouble on my front end is the wheel being out of round and not a tire balance problem, I contacted a fella named Patrick at Scooterdepot and he told me if I would just make a short video showing that the wheel is not rolling true then they can see that it actually is the wheel that is the problem and he would see to it that I get a new wheel which he said was covered under my 6 months parts warranty, so I made the video and sent it late this evening so I will find out now if he's just blowing smoke up my back side or if they intend to make this right for me. if not this will be a lesson learned. Thanks for the heads up on those guys , you wont see me promoting them in anyway on here again and I will keep all posted on how my bad wheel warranty situation goes with them.
|
|