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Post by greyfox278 on Jun 30, 2010 0:39:01 GMT -5
grr 2 days now 24 hours into it. i bought a 100cc big bore kit for my 49 cc meitian model mt50qt13 with engine 139qmb scooter. kit had 50mm piston. well got everything in. and have tried 2 days now IT WILL NOTT RUN it has compression from hell and spark. when we did the timing we lined up the 2 small holes with the top of the case with the big one on top as shown and told to do in the manual. as far as i can see its getting gas but it just wont start now. dont know what i forgot to do the scooter was bought brand new last month so i am not messing with stuff thats out of wack or old parts everything came apart pretty easily actually and have had no problems other then trying to get it to run. may have been off a cooterhair on those small holes on the cam but didnt think it would make much a diffrence got it to fire a couple times today but but just like a blah blah but that was it. .. rollin it over with the throttle twisted makes it sound like it cuts it out.. tried using starter fluid to prime it to go and no go. btw bought after market performance cam for it as well dont see much of a diffrence other then the lobes r slitley bigger but not by much. but the machine doesnt run getting ready to go to bed to mess with it for another wasted day off. is there anyone that can help me make it run again it would be greatley appreciated cuz this sucks everything seems there have the 3 fundimetals compresion fire and gas as far as i know but priming it should have made it start anyway. tommorrow im going to recheck the timeing but the t was lined up with the crank case mark and the cam gear was lined up as told but not seeming to make a diffrence all it does is roll over a few times and sometimes poof the hose off the intake black manifold thing connected to the carb. cant figure out what is wrong if anyone can take the time to read this and can help PLEASE EMAIL ME
ron_minich2000@yahoo.com or add me to mesenger so we dont gotta play forum tag. at this point im up for any suggestions or help i live in pa and nobody around here really knows about them not even in the bike shops which is ridiculus and they dont wanna mess with it , any help right now is greatley appreciated i wrote this so long so i can try to describe this the best i can if i have to would do a video confrence with somone on skype.
so if somone can help and takes the time to read this thanks much
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Post by ILLGotti on Jun 30, 2010 1:14:10 GMT -5
I'm sending you a PM, read it...
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Post by "Big Guy" on Jun 30, 2010 6:57:33 GMT -5
Well the whole idea of the forum is so we can play forum tag! So... what about your carb? Still running the stock QMB carb? Did you up-jet?
-Rich
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Post by greyfox278 on Jun 30, 2010 10:47:12 GMT -5
no we didnt jetit we were thinkin that but the douchebag at scrappydogs said we didnt it was a bolt on kit so maybe it aintgettin enough gas
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Post by ron521 on Jun 30, 2010 10:57:42 GMT -5
calling the fellow at scrappydogs a "douchebag" because you are having a problem is rather harsh. I purchased a 72cc kit from him, and it ran immediately.
My guess is that you assembled it incorrectly.....as you said yourself... "may have been off a cooterhair on those small holes on the cam but didnt think it would make much a diffrence"
Even ONE tooth off is enough to keep it from running right...now we all get to see whether you are man enough to apologize for blaming him for your own screwup...
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Post by greyfox278 on Jun 30, 2010 11:16:06 GMT -5
yeah i get your point i spoke with them again this morning. they fixed the fact there were parts missing. we got the timing right but it still isnt running. i justwanna know why they didnt say anythingabout the jets for that kit. they also said it will work with your stock parts including the carb. so none of this makes sense then. thats the absolute last thing i can think of. so instead of smart mouthing about my post why not tell me if its the jets then or not? cuz the timings on now. so is it the jetting then
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Post by greyfox278 on Jun 30, 2010 11:18:56 GMT -5
that and "running right" it isnt even running at all toeven heqar it ack fire if the timing was off. and i was upset cuz my kit didnt come with half the parts. and as you r saying u got the 72cc kit so it might work right offf the bat with the stock carb and stock jets. i got the 100cc kit so it might require bigger jets so now im trying to find that out . so untill then im gonna have to put the stock piston back in it till i can find out or get the rest of the kit or find out what i need
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Post by greyfox278 on Jun 30, 2010 11:23:05 GMT -5
so timing is right still no run. so obviousley someting still isnt right. havent messed with the jets or adjusted the valves. i remember reading something about them going to .004 or .005 so i take it they r .002 stock then. wonder if that has something to do with it.
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Post by tomcas on Jun 30, 2010 11:44:14 GMT -5
What stroke crank did the kit come with? If it's a true 100cc kit then you should increase not only the main jet but also the idle jet.
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Post by capturedbyrobots on Jun 30, 2010 12:27:00 GMT -5
so timing is right still no run. so obviousley someting still isnt right. havent messed with the jets or adjusted the valves. i remember reading something about them going to .004 or .005 so i take it they r .002 stock then. wonder if that has something to do with it. You need bigger jets, period. Without them, you're just wasting your time. Buy a micro drill set and just drill out the stock jets. I got a set for about $10 shipped on some online hobby store.
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Post by erictheviking666 on Jun 30, 2010 12:37:15 GMT -5
Yeah you will need a very large jet for a 100cc. I'm interested to see what kind of performance you get once you get it running. Of course you will probably get only 1,000 to 2,000 miles out of it with a 100cc kit. But, it ought to haul ass for that short period of time. Also what kind of machine work did you have to do to get that too fit?
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Post by greyfox278 on Jun 30, 2010 14:16:48 GMT -5
wasa kit offf ebay didnt have to have it bored came with a jug. well got the stock head on and now it just wont run period. rollin it over tryin starting fluid and nothing. while it rolls u can hear the piston go poof poof poof untill u give it throttle and its like it cuts out when u do its really messed up. didnt change much other then the head so everythingis back to stock now and it just wont run, what a great idea this was i justshould have gotten my cdi and coil which i did and got better performance out of it. should have just got my pipe and left it at that, its sad tho the guy thats helpin me with this has worked on bikes his whole life. atvs mowers small engines and race cars. i know he knows what hes doin . but after looking it over its almost actin like its still not gettin gas but ud thinkspraying starting fluid in it to prime the carb would get it goin. it doesnt make sense at all. i know the timing is right everything was lined up perfectley this time. theres gotta be something missing or unchecked obviosley. any suggestions now r appreciated
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Post by erictheviking666 on Jun 30, 2010 14:32:11 GMT -5
No it's my understanding that the cylinder will not seat properly if the case isn't machined. Maybe that is what is keeping it from running right. I've never done one of those large BBK's, amybe someone else who has can chime in. But it's pretty well known that anything over 72cc has to have the case machined to fit.
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Post by lshigham on Jun 30, 2010 14:35:41 GMT -5
50mm is not a 100cc kit but somewhere in the region of 82cc, 52mm is only 90cc.
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Post by greyfox278 on Jun 30, 2010 14:36:15 GMT -5
dude i can give u the link on ebay where the jug came from everything fit fine on it with out anything. that and besides i HAVE IT BACK TO STOCK RIGHT NOW AS WE SPEAK STOCK PISTON AND JUG BACK IN and it still wont run so its not all that other sh!t theres something missing im rollin it over when i give it gas i dont hear the poof poof poof from the piston untill i let off the gas then it does it again and just rolles i got good spark and compression im wondering if its gettin enough gas
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Post by lshigham on Jun 30, 2010 14:37:30 GMT -5
52mm, or 90cc, is the biggest that can be used without significant modification.
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Post by greyfox278 on Jun 30, 2010 14:38:01 GMT -5
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Post by ron521 on Jun 30, 2010 14:38:03 GMT -5
So you are back to stock and STILL can't make it run? Then for sure, jets are NOT your problem. Won't even run on starting fluid? Then it is NOT a fuel problem, but an assembly problem.
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Post by greyfox278 on Jun 30, 2010 14:46:19 GMT -5
assembly of what what can be wrong i wish i could show a vid of the job. the mechanics r put together right. i dont get it hopefully the guy that sent me the pm gets a hold of me if what hes sayin is true he might be able to help
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Post by lshigham on Jun 30, 2010 14:49:07 GMT -5
Somebody's telling porkies. That's an 82cc kit, not 100cc.
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Post by greyfox278 on Jun 30, 2010 14:52:05 GMT -5
yeah now u know why i complained about the guy that sold it he didnt even send the circlips like was in the add. good thing i didnt lose the stock ones. but good thing tho its back to stock now i just need to figure out what it needs to make it run again. sad to i bought it brand new a month ago guess i should have just left well enough alone
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Post by lshigham on Jun 30, 2010 14:52:41 GMT -5
Have you checked if you have a spark?
Also, I would not recommend using the stock head without at least enlarging the combustion chamber.
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Post by cyberbeer65 on Jun 30, 2010 14:54:04 GMT -5
I just installed the same kit from the same vendor. That is a 50mm kit, it's only 83cc's, not 100cc's. Here is a quote from the Main website... "Everything you need to bump your 139qmb engine up to a whopping 83cc. Many places commonly call this a 100cc kit. The bore diameter is a full 50mm, the largest you can go! Get the advantage on everyone else and surpirse the 150's when you keep up with them now. Warning: you may have to register this as a motorcycle now. Comes complete with cylinder, piston, rings, wrist pin, circlips, and gaskets. These are priced lower than anyone elses 80cc kits, and some 60cc kits as well. $89.95"
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Post by lshigham on Jun 30, 2010 14:57:45 GMT -5
I just installed the same kit from the same vendor. That is a 50mm kit, it's only 83cc's, not 100cc's. Here is a quote from the Main website... "Everything you need to bump your 139qmb engine up to a whopping 83cc. Many places commonly call this a 100cc kit. The bore diameter is a full 50mm, the largest you can go! Get the advantage on everyone else and surpirse the 150's when you keep up with them now. Warning: you may have to register this as a motorcycle now. Comes complete with cylinder, piston, rings, wrist pin, circlips, and gaskets. These are priced lower than anyone elses 80cc kits, and some 60cc kits as well. $89.95" The bit about 50mm being the biggest isn't true - I have a 90cc kit for a 139QMB, I measured it and it's 52mm. www.centralscooters.co.uk/product_info.php?cPath=514_653_659_496&products_id=3391
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Post by greyfox278 on Jun 30, 2010 14:59:09 GMT -5
for the 3rd time yes theres spark
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Post by lshigham on Jun 30, 2010 15:04:38 GMT -5
for the 3rd time yes theres spark Sorry, didn't see it.
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Post by lshigham on Jun 30, 2010 15:06:30 GMT -5
You should try checking the valve clearances, even though you used the same head I'll bet they have changed.
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Post by greyfox278 on Jun 30, 2010 15:12:10 GMT -5
even just from pulling it off.. yeah were gettin ready to do that right now cuz i know its in time for sure the dots lined up real well
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Post by greyfox278 on Jun 30, 2010 16:45:11 GMT -5
well well well after 3 days and all these people tellin me i was doingit wrong . discoverd today i got a bent valve AND THIS WAS IN THE STOCK HEAD FROM THE FACTORY ,,,,,, WOW so ill be gettin a new head with valves seated ready to go and i should be on the road tuesday next week,.... no sh!t so now i know why i was getttin so much back pressure out the intake cuz the intake valve was bent, so there it is all the stuff will be goin into it next week. thanks for the help everyone
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Post by ron521 on Jun 30, 2010 17:59:07 GMT -5
If the intake valve was bent from the factory....how did it run BEFORE the installation?
The probability is very, very small that it came that way. Much more likely to have happened "later".
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