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Post by shiftless on Oct 6, 2008 14:24:17 GMT -5
thank YOU, merci, wunderbar, you da man! |
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Post by JR on Oct 6, 2008 22:36:48 GMT -5
I am a new member and really enjoyed your article and i have the Yamaha/Linhai engine and am having trouble with my scooter dying when i pull up to say a stop sign. I've went through the carberator and have replaced all the cheap hoses on the fuel lines and vacuum lines and am concerned that the fuel pump is starving the engine, it runs great on the road and will idle perfect when you start it and just let it run but especially when it's cold it wants to die when you slow down to stop, doesn't do it as bad when it's warm, this just started and is very annoying and is also under warranty but seller is a long way off and I am very mechanicaly inclined so with a little direction I believe I can fix this myself. Is it going to take a fuel pump that puts out more mine is a 12 liter per hour. Thanks
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Post by lyle067 on Oct 9, 2008 14:15:44 GMT -5
I have a 2008 MC54 250B with 1900 miles. It stalled out then it was ok at idle but stalled upon acceleration. The fuel lines were replaced during the PDI. Needless to say I tore the thing down since nobody on the board had any ideas ( except Wildbill wanting some spell corrections " Thanks Bill" ) any way I finally got the time off from work to get it running and took a 200 mile ride today. Goes to show that even a blind squirrel finds a nut once in awhile. If anyone encounters this problem I'll share my unique solution. OK, you have my interest, what did you do to solve the problem? |
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Post by wxguru on Oct 9, 2008 15:14:34 GMT -5
jrryan....do a valve adjustment, and all of your problems will be gone. There are numerous people on here who have had the same problem, me included, and it solved it.
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Post by ifly1956 on Oct 11, 2008 20:00:53 GMT -5
I don't need it now - but is there a link that shows how to adjust the valves ?
Thanks !!
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scootda
Junior Dawg
Linhai Super Strada 300
Posts: 5
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Post by scootda on Oct 14, 2008 19:00:47 GMT -5
I have the strada 300 and can someone tell me what the mm is on the carb. Thanks,Scootda
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Post by earlwb on Oct 22, 2008 9:56:26 GMT -5
30mm
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Post by desertdog on Oct 26, 2008 10:22:13 GMT -5
hey guy's first post here, i'm working on a friends scooter because no one else will intown will, they just wont touch these chinese scooters, cant say i blame'em either.  anyrate here's the problem, the scooter idles chopy (rough) like a harley  ?, the owner has already replaced the carb once and it still idles rough. it does run smooth at high rpm's, so i'm leaning on an idle jet issue, or i suppose it could be an intake gasket leak?? what should i do first in testing . 1. valve adj 2. compression testing and what should this be 3. idle jet size, elevation is 5500ft, should be a what? 4. spark plug gap , ?? i run .035, or a .040 in my china quad and it runs great would that be normal for a scooter 5. should i remove the emission's on it ? it is a roketa off brand 250cc from scooterdepot.com, (aka )allroadusa.com, that was his first mistake to buy from them. the engine is a 250cc water cooled shanghia, go ahead and correct the spelling if it helps you. its to cold outside to go check again. and how the heck do you check the voltage on the cdi, or the coil wire to see if it is good, hope i've info'ed enough , ps: oh yeh the color of the scooter is grey, (just an old car parts joke).... |
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mackm
Junior Dawg
Posts: 5
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Post by mackm on Oct 26, 2008 11:09:22 GMT -5
Do a Valve adjustment first!
Hey does, anybody know what's the compression on a Linhai 250CC engine? I did a valve adjustment on my 250cc MC-54-250B and it's only reading 145psi.
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Post by messenger61 on Oct 26, 2008 13:41:57 GMT -5
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Post by desertdog on Oct 27, 2008 11:33:40 GMT -5
yep thats exactly what im working on a jmstar 250cc with a shanghi engine. 1. i did find out that the pilot jet was completely plug up and as well as the main the pilot jet was a 35 so i will boost that up to a 38 the main jet was an 88 size so that one will get replaced with a 110 to a 112, 115 ? so off to the japanese bike shop to get snugged at and or laughed at , or both, i dont care, but it is not mine this time , and i will check the valve clearance thanx all DD  |
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Post by desertdog on Nov 2, 2008 9:05:23 GMT -5
 to whom that said adjust the valves on the scooter i was working on thinking it was fuel.. well it was about 13.99% fuel and 86.1% valves thanks for the info ;D those valves were different than what i am used to in adj., got all the info on that motor to adjust the valves , off of oregonvintage, thanx goes to them on that it is probly running abit rich , will make some adjustments in that area , give the owner a call for pick-up wenn done . its raining hard today up here in the high desert so no long road test today DD ps: Tolerance and Apathy are the last virtues of a dying society Aristotle
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hdv24u
New Puppy Dawg
Posts: 4
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Post by hdv24u on Nov 10, 2008 18:13:41 GMT -5
hello all, what is the best thing to make out of a sl250-22 shenke, i thought about taking it apart and build my brother a firewood hauling trike out of it using a good old briggs & stratton. scence he has a fireplace it may workout good. any comments on this idea welcome
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Post by rolandjjr on Nov 16, 2008 23:27:27 GMT -5
Has anyone tried or heard of the 290cc big bore kit for the yp250 engine. I've seen a couple
advertised on ebay. A complete kit with gaskets, piston, rings, nikasil coated cylinder. All
for around $350 USD. The seller said it should not require any other mod other than re-jet.
I would guess that would make an MC54 top out around 90mph. Any thoughts, or other
input?
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Post by ajax02 on Nov 28, 2008 12:45:32 GMT -5
The dealer rates my scooter at 250cc and 16.6hp, which I guess is wrong; but I got 13" wheels on my scooter; at least that is what is on the tire; so how do you account for that?
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Post by scooterran on Nov 28, 2008 22:28:37 GMT -5
Swakk, I really don't know what to say. You have done all the scooter dawgs a great favor. Many thanks to you.
Do you know where I can buy a copy of the Yamaha YP250 service manual? And the 244cc CVT Honda CN 250 service manual ?
Please take a bone............
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Post by scooterran on Nov 28, 2008 22:35:39 GMT -5
Does someone have any bones ?
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Post by scooterran on Nov 28, 2008 22:56:21 GMT -5
Lottoman, I too have a Roketta Mc-54-250-B and have had some problems like yourself . I haven't done a valve check yet but that will be 1st. What else should I be looking at?
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Post by gerald on Dec 22, 2008 20:02:47 GMT -5
Great work people. I have the Honda clone. I have no idea which is the better engine. Does anyone have some facts on that. I like some of the features of the Honda clone like the better oil change access. I also like the placement of the exhaust for the normal repairs. I have had seven scooters and am getting used to fixing them. Lets quit fussing about what we got from the obviously bad sales system and start having fun with them. I love riding mine and even tinkering with them all the time. I get 10,000 miles a year from mine.
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mannyack
Junior Dawg
JMstar 150, JCL 250A
Posts: 11
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Post by mannyack on Feb 4, 2009 6:23:04 GMT -5
I'm confused about this whole displacement issue here between these engines and I'll tell you why. This thread originally started pointing out the differences between motors. Mine has a case stamp of 170mm right on the top of the CVT case were the owner's manual states the engine VIN # should be. By reading this thread I thought I had a Linhai/Yamaha clone on this new MP250A by JCL scoot. If I plug this number on an engine displacement calculators found online, I get ~ 244cc. Isn't that a CFMoto engine type? My cylinder points to the front of the bike. Also, if you use the bore x stroke info on JCL's web site, you come up with 249.88 cc. It doesn't make any sense. Is there such a thing as a Linhai/Yamaha clone engine with a displacement of 244cc? Does anybody have a clear answer to this?
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Post by earlwb on Feb 9, 2009 11:01:47 GMT -5
The website is wrong. they just copy and paste without ever verifying anything as to specifications. You would have to manually measure your bore and stroke to confirm it, but the means pulling the head off to do so.
The Linhai style copy engine is 257cc displacement, and the CF-Moto copy engine is 244cc displacement. That is the OEM factory shipped engines. At the time Yamaha wanted to get a little bit of bragging rights over the Honda engine. The difference means nothing as to performance of one engine over the other.
There is a 275cc big bore kit around, but I wouldn't bother installing it as you only get about a 8% displacement increase, so it doesn't increase your power or speed enough to notice.
I haven't seen a 290cc big bore kit yet, so I don't know.
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Post by unclepablano on Feb 9, 2009 18:41:59 GMT -5
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Post by mg on Feb 9, 2009 20:55:35 GMT -5
There are some scoots being sold with a linhai clone engine the same size as the yamaha yp6 250 majesty, 249.8cc,designated stamped 169mm on the case. Roketa sells one called a wangye "top motor". It may be a genuine Linhai engine.
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Post by chetti on Feb 10, 2009 2:03:57 GMT -5
Just hit a 60,000 miles and running strong.. Not my scooter!!! Had to get a laugh in somehow. But the scooter are fairly cheap, fun to ride, gives alot of us something to talk about, and are darn fun to ride. The best $1700 scooter I ever bought. I hope it last 20,000 miles atleast but realize it will go through tires, belts, ect. to get there. It is a factor of life on the scoot. Parts wear out. But I learn alot from listening to other and do take advice. Thanks.. Scoot with pride.
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Post by travisnj on Mar 7, 2009 7:32:11 GMT -5
I have a NST XY250T-4 but dealer sent me to Roketa for parts on a MC-62-250. I do know that I have a Disk Brake in rear, I muffler has the chrome strip on it (not big black bulk like my CN250 helix clone did), I was told by ScooterTronics that this engine is a 260 Classic.
Any where in this forum dealing with this engine? Parts?
Thanks
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Post by spakeee on Apr 22, 2009 8:23:04 GMT -5
I got my 250 from Brads scooter in St Charles mo great guys had a few probems with it the cly head was bad they took care of me very good bikes runs very good spakeee@yahoo.com
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Post by noobishrook on Jul 2, 2009 14:05:52 GMT -5
Some nice info there Andi. Thanks a bunch.
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Post by topzykretz on Jul 9, 2009 5:44:35 GMT -5
hi, i would greatly appreciate a location of someone who knows these bikes and works on them i live in staten island ny from brooklyn and would love to find a local mechanic who is fair and knowledgeable.I own a jonway yy250t 08 and i love it! rides great had a few issues when i first recieved it but tech support was great and sent everything i needed no questions asked.They were minor things that i was able to fix like crap mirrors and battery,spark plug was not in properly so my first ride was eventfull but no problems since and i now have about 400 miles on it and would like the comfort of having a local mechanic for jobs i wont be able to handle i bought my scooter and 5 days later the price went up about 300.00 so i was happy i grabbed it when i did in june.please feel free to contact me with any info and thank you in advance hope to meet some of ya soon..................TR  |
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Post by harleydawg on Jul 11, 2009 6:35:24 GMT -5
how do u make a rotel mc 250 go faster
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Post by xy260t4 on Jul 14, 2009 14:50:27 GMT -5
hi topzykretz im from queens nyc farockaway their a shop in long beach the number is 516)470-0409.place name scootor city"112 austin blvd.island park ny 11558.they work once on my bike to work on carb.they even got a tow guy maybe use your lady tratics and they might give u a better tow deal mines was 60dollars each way
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?, the owner has already replaced the carb once and it still idles rough.
to whom that said adjust the valves on the scooter i was working on thinking it was fuel.. 
