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Post by mapbike on Jul 28, 2011 17:32:18 GMT -6
Who sells these brands you just mentioned? I dont remember seeing them anywhere I've looked and I know the engine in my Roketa MC-74 has been a real good one so far but I have never seen a brand name on it anywhere. Just curious about who sells the "name brands" Peace I would never buy an engine that is 'no-name'... there are just too many ma & pa engine builders in China and you have no idea what you are getting... If it says Znen or Lifan or Linhai you stand a better chance of some quality.
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Post by mapbike on Jul 28, 2011 16:01:08 GMT -6
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Post by mapbike on Jul 28, 2011 15:40:04 GMT -6
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Post by mapbike on Jul 28, 2011 15:15:20 GMT -6
I was at one of our local Hardware Stores today and decided to look at some different things that might make a nice compact but useful catch container for the PCV Vent. The 1 1/2" 90* PVC elbow fitting I picked is threaded inside at one end and has the glue & press in on the other, the reason I picked this type of elbow was so that the threaded end can be unscrewed so the container can be cleaned out if needed at some point, I will drill & Tap each cap so that the PVC 1/4 X 1/4 barbed fittings can be screwed into each end, I will also build a mounting bracket that will be attached to the container out of a piece of Aluminium strap, I do believe this elbow will make a nice compact effective catch can for the PCV (Positive Crankcase Ventilation) on my scoot, it will get a good coat of Krylon Fusion Gloss Black paint also, just to dress it up a bit.... I will get more pics up as soon as I have the chance to get this done. let me know what you think about it fella's Peace, Shan Attachments:
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Post by mapbike on Jul 27, 2011 18:56:05 GMT -6
I found one of these pipes on a buy it now auction from kingstarscooters that also had a make an offer button on it so I figured they cant say but one of two things so I hit-em with the $115 and the next day I had it bought..... could have got one that was the long pipe (P&P brand set up) from morethanhundreds (seller) on ebay fpr like $124 shipped, it is chrome and all, and actually looks pretty darn good, but i wanted the shorty........ so I went this route, monstergy6 has the shorty mufflers too witha stainless header pipe and all for a lot more $$$'s but I think it is specifically for the ruck and I didn't want to spend that much on a pipe right now. Yep mods are still on the list of things I want to do...... I also have three motorized bicycles and plans for more, so mods and tinkering are a big deal for me......always messing around with something when I can....LOL! Yeah, that cross bar on my 150 is a big pain... but we just have to work around it. You do the same friend, ride safe and watch out for the crazies who think they are the only ones on the road.....yep we got those suckers all over the place in this part of the woods....LOL! and they'll getcha if you aint careful. Thanks for the compliment bong, I like it too.. Peace, Shan Ah yes, spilling blood makes it a true Red, White, and Blue. I still say VERY COOL!!!! That the first one I've seen on a scoot other than a Ruck. I was looking to get one from Ebay myself but was out bid at $130.00 Now remember I ride a 50cc but the engine and mounting is almost identical minus a few cc's . If you can post a video I think it would be a first for that pipe. Congrats!!!! As for the UNI I know ya 150 guys have a problem with that cross bar. Now ya got a real problem though. You modded the scoot. It will never end now!!! A9 Cam, 4 valve head, It never stops Just ride safe and look out for the other guy!!! Very Very cool my friend
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Post by mapbike on Jul 27, 2011 18:44:31 GMT -6
Here's a link to a short vid I just made and uploaded to youtube, that will give anyone wishing to know what it sounds like a an example, and like I said on this vid. it does sound better live than it does on the cell phone video, but it still sounds pretty good IMO....
Peace, Shan
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Post by mapbike on Jul 27, 2011 18:07:31 GMT -6
Thanks bong, the exhaust sounds real nice, it is a straight through design with a perferated inner tube that does catch a bit of the gases to keep it from sounding like a straight pipe, it does have a bit of a pop back when reved up pretty good and then letting off the throttle, but not constantly and it has anice deep tone, NOT high pitched snappy sounding muffler at all and I'm glad of that. As to the UNI Filter, I was going to mount it direct to the carb. but it wont work that way, the cross bar is in the way and the carb sits so low that the filter would be mashed up real tight against the fender, so that is why I decided to mod. the snorkle and plus instead of it just getting a bunch of the dusty dirty air being kicked up on my dirt roads now it is higher and up front so the fresher cleaner air coming in under the seat hits the filter dead on which may also keep it cleaner longer too. Bong this is a very good sounding pipe, they had it listed for $129 on ebay and I made an offer of $115 and they accepted it, so I got it shipped right to my door for $132, was a pain in the ole bee yut (butt) getting it on my scoot but it's there and I like it a lot so far, I did take my die grinder and beveled the ID ofthe flange that goes to the head so I would have a nice smooth flow without any extra restriction, all else was real nice, if your scoot has a single shock and doesnt have the long mounting posts that stick out from the swing arm bracket, then you should have much less trouble getting this set up on yours, mine needed some serious tweaking which was a bit rough but after I figured out how to get it done and done it, it all went together pretty easy. Didn't really know how that RED Muffler would look on my Blue and White Scoot, but since my gauge faces are Red White &Blue I thought what the heck, I'll just stay with the patriotic thems sorta....LOL! Oh well, my blood is on it and it owns me so I'm happy with what I got done so far....... now I want a better head, better carb/intake and maybe the A9 cam and also 59mmBBK, maybe the 4 valve head as well, NOT 100% sure on that one yet but maybe. I say go for it, get that pipe and I'll bet you'll like it, I'll get a short vid uploaded on you tube ASAP and then post the link here on this thread so anyone who wants can hear how it sounds. Peace, Shan Very Very COOL!!!! I almost bought one of those for my 50cc. I still might since it will bolt on to my Header pipe. Anyway to post a video of the sound?? Does it have a silencer??? Anyway I love it!!!!! The dirty scoot is a plus in my book. That means ya spend more time riding than washing If you can, I would put the UNI directly on the carb without any intake hose. Just an idea if it fits.
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Post by mapbike on Jul 27, 2011 17:04:19 GMT -6
The 4 valve head kit, 59mm BBK, and 30mm carb. & intake upgrade, will likely be the route I go, I ride in very rough dusty dirty conditions and EFI or the turbo would not likely hold up well to these conditions, plus I ride 25-40 miles at times and am looking for better performance but also as much reliabilty as possible too, so I will be looking into doing those upgrades maybe as a winter project if all goes well and I get my new work shop finished. I did get my new exhaust on today as well as my UNI Filter and just those two things made a very noticable difference, NO more sputter at high RPM's either so the rich condition is gone now but i need to make sure that I'm not actually too lean now, scoot is running real nice but it is so HOT here right now I dont think it would matter how rich the mixer was it would likely overheat, it's 105 in the shade right now and very dry so it could show to be OK for now but when it cools down in a couple months I may be way lean.... time will tell and I will do a plug check to confirm what I have now. Peace I would go 4 valve..cast iron... if you can find one...... there is more meat left in the head... some of those custom ports jobs leave something to be desired IMHO. Not saying that scrappy's are like that but some I have seen have been are fairly poor quality. I think with a 59 or larger a 30mm would be great...but I would go for EFI, if you can understand how to program the ECU in chinese! (actually it is in English now) How about a turbo? I have bought from these guys and never had a problem... in Canada at least. .chinese-parts-canada.com/turbocharger_fuel_injection.html" rel="nofollow" target="_blank">.chinese-parts-canada.com/turbocharger_fuel_injection.htmlI think the weak point on these engines is the open cage crank bearings and the connecting rod bearing... perhaps the stroker kits have a better c-rod bearing I don't know... The options are virtually endless...
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Post by mapbike on Jul 27, 2011 16:48:02 GMT -6
Here's how I did my UNI Filter install as well, I use part of the snorckle pipe that went to the filter box and use a PVC union to adapt each of them together, worked great and even put the filter in an area where it gets fresh air from the front as I'm going. Peace Attachments:
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Post by mapbike on Jul 27, 2011 16:42:12 GMT -6
My scooter is very dirty right now, just wanted to share a pic of the exhaust after I finally got it on today. I ordered this pipe/muffler from kingstarscooters on ebay for $115, it sounds real nice and along with the UNI Filter has made a very noticable power increase, this thing however was a royal pain in the backside to get on my scoot, I think it must be designed for the Ruckus or something else besides a Roketa MC-74-150 Hunter style scoot, I had to cut 2 brackets off and rebend the pipe before it would even come close to fitting, if I didn't have the tools and the know how to do this, this buy would have been a big wreck, I did booger up the chrome pipe a bit getting it rebent, but thats OK because it is hardly noticable & I plan to make a custom pipe later on myself anyway. It sounds nice, I need to check my spark plug and see if it is running too lean though, I have a #115 jet in it now and I have a #120 that I can put in if needed, it pulls so much better and a very noticable increase in low end torque on take off, it may be a bit loud for anyone looking for quite mellow sound, but I like rumbling throaty exhaust so it's great for my taste. I need to up my roller weight though, 7500RPM's @ approx. 52MPH @ 12g. roller weight equiv. I will give 13g a try and see where that gets me. Will be getting myself a catch can put together real soon also, tired of the oil splattering a few drops at a time from my vent filter when I run at 7500RPM's for a few miles. Peace, Shan Attachments:
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Post by mapbike on Jul 25, 2011 18:07:58 GMT -6
Maybe save my pennies and just spring for that 200cc GY6 scrappydog is selling and put the 4 valve head and a couple other things on it........ I bet that would get my little scoot scooting right along......!
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Post by mapbike on Jul 25, 2011 17:59:26 GMT -6
Yeah Man, sprocket I've looked seriously at that head at scrappydogscooters.com he sells that same set up for $199.00, he also sells a Big Valve custom ported head that kinda caught my eye as well, I was thinking either of these with the 59mm BBK & maybe the 30mm carb and alum. intake might offer a nice performance increase, might be a good set up for the 846 belt and some 14-16g sliders or rollers. might end up being a good winter time project.......! Peace, Shan
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Post by mapbike on Jul 24, 2011 19:40:38 GMT -6
Yep, I have some very high quality Foam Filter oil that I use on my Nitro R/C trucks and buggy, and yes you are right about it be very important that the UNI or any foam filter be oiled with the correct oil..... this excludes K&N Filter oil because it isn't designed for foam filters and isnt tacky enough to be good in a very dusty environment. My stock jet wasn't marked so I have no idea what size it is/was, I just ordered the 115 because other than "standard" that was the smallest scrappydog offered. My stock filter is the round paper type for the under seat filter box(Hunter Style)... If I can get the engine breathing a bit better I may work my way back up in roller weight a bit, I tried the 15g sliders with the performance variator and didn't like it much gained a bit of low end but lost a few MPH on the top, I put my stock variator back in and put some cheapy black rollers in and still had the same top end and made nice gains on the bottom end over the sliders and "performance variator". I haven't tried every combination yet so I may still end up with sliders and the perf. var. in the end if I can find a combination that works with them but so far both of them decreased performance, still have some more experimenting to do though so those parts may work out if set up different. I did try a 1500RPM main spring and hated the way the clutch performed with it, I waisted $15 + shipping on that thing, didn't help bottom end at all and cost me about 12-15 MPH on the top.....that was a big joke on my scoot for sure. I'm leaning toward getting as much extra Torque from my engine as possible and finding my happy spot with variator tuning and possibly an 846 drive belt to help just a tad on the top end if I can stand heavy enough weights to see a benefit from the longer belt. You're spot on......" no replacement for displacement " I've built some pretty salty small block Chevy's back in the day and I never once got a 283 or 327 to pull like one of the 406cid small blk. Chevy's I built, more cubes = more torque and the torque is what gets you moving....... Everything is determined by getting that sweet spot at the right place and then we just have to be content with knowing they are doing all they can do. You're very right on every point you made here, thanks for the info. I'm all ears on these GY6 engines, I dont claim to know much about them yet, still a bit of a noob to them, I've been building and working on small engines for 30+years but each type has there own personality and I can see already that these are pretty good but also very limited in their stock form. Thanks again sprocket..... Peace, Shan mapbike.. oil that UNI.. I keep seeing people running them dry and they wonder why they need a ring job every 1500-2000 miles... The rule of thumb I have used for years is... go up 2 jet sizes for a free flow filter and 2 jet sizes for a free flow exhaust. BUT Thing have changed. If your stock filter is foam, you likely don't need to go up in size for the UNI My experience is it is trial and error. If you get the carb dialled in you may gain about 3-5 MPH at WOT, but often I have found that the WOT will in fact be less than stock... You will probably have better results tuning the CVT and shifting the power curve of the engine. These engines all seem to have a 'sweat spot' usually at about 85% WOT and you can shift this somewhat until you hit the CDI rev limiter... But unfortunately anything you do to the CVT will impact either the top end or the take-off... the trick is to find a happy medium you like... But your gains will not be great... there is no replacement for displacement...
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Post by mapbike on Jul 24, 2011 10:11:36 GMT -6
Alley..., When I just slightly back off the throttle when it sputters it settles right down and runs without a hitch, it only sputters/cuts out a WOT at above 7200RPM's and doesn't do it immediately it will run at that RPM for a short spell and then the jolting cutting out will happen, at that point like I said I can just back off the throttle a bit and it runs smooth as silk. I believe you and cruiser both hit the nail right on the head when you told me it sounds like a rich condition, your description of what that will cause is exactly what my engine is doing..... I'm gonna pull my spark plug and check it's color also, if it's fairly dark, this will be another indication of it being to rich also, I ordered the #115 jet from scrappydogscooters actually wanting a smaller one but his sizes take a big jump from what he calls "standard " to #115 then #125 & #135, I knew the 125 & 135 would be way big for a stock engine so I just went with the 115 hoping it wouldn't also be to big, I also have a #120 that I ordered from Steve @ monsterGY6 but I'm not gonna mess with it at first when I put the Uni Filter and the New Shorty Exhaust on, it could be that the #115 will work just fine with my near future set up and if it is just slightly small I will likey try to drill the jet to a size between the 115 & 120 and work with it until I get that nice light chocolate brown plug color and good throttle response. I'm really hoping to get back the lost top end speed I have lost by creating enough power to get me back to the 60MPH flat out cruise speed, so far most of what I've done to my scoot has hurt my top end, when I got this scoot it would cruise easy at 60-62mph on the flat with no head wind or incline, now I have the orange CDI, the orange Coil, 12g equivilent roller weight, a gates 842 belt and the "performance" variator the scrappy dog sells, all of this has increase my lower end slightly and for sure helped keep the Rpm's and power up on the hills but I have lost around 8-10mph cruise speed, I weigh 198lbs so I'm not a heavy weight but not a light weight either and my weight is the same as it was when my scoot would run me 60-62mph on the flat. I'm loooking to move my variator roller weight up to the 12.5g - 13g area and stiill have hill pulling power and maybe also get my cruising speed back to at least 58-60mph without having to turn 7500+RPM's to do it. I know increase air flow through an engine with good compression and correct timing will add HP and torque so I'm hoping the UNI and the better exhaust will make at least a slight improvemnet that will help recover some of the top end I lost, my scoot came with 16 or 17g rollers and had a sluggish bottom end, I changed to sliders @15g and and lost top end and gain almost nothing at the bottom, still was sluggish IMO, I went with three10g rollers and three 14g rollers and my bottom end really came alive but at 12g equivilent weight I took a pretty big hit on my top end speed, I'm trying to find that happy medium where I will still have good bottom end without as big of a top end sacrifice. Sorry for the long post hear, just wanted to explain what I've done to this point, what my results have been and what I'm hoping to achieve. Thanks Alley..... Peace, Shan You can verify it very easly, which it is, it is an old trick and very accurate and It works at all speeds. When it starts to act up on you Just BACK OF THE THROTTLE a little maybe a 1/4 inch on the grip and HOLD it there. A. If it Speeds up on you your LEAN B. If it Hesitates, Sputters or Settles down your RICH. Alleyoop Attachments:
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Post by mapbike on Jul 23, 2011 22:15:14 GMT -6
Thanks Alleyoop,
Thats what I'll do, it has never stumbled like that until I put the #115 jet in and then thats when it started, so I do believe you are right on with the rich condition diagnosis....
Thanks again all, Peace Shan
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