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Post by twiztidmike420 on Oct 2, 2012 19:13:50 GMT -5
i just orderd a 100cc kit from ebay which i know is 83cc.
my problem is that when i go to put the cylinder over the piston and into the motor it doesnt fit! and ideas??
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Post by millsc on Oct 2, 2012 19:16:59 GMT -5
Wont fit over the piston or into the motor casing
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Post by twiztidmike420 on Oct 2, 2012 20:14:55 GMT -5
wont fit into the motor casing
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Post by millsc on Oct 2, 2012 20:21:09 GMT -5
your gonna have to bore the case or get a smaller kit make sure your locator dowels are in the right place before you start boring try oiling the hell outta of it and tapping it on with a rubber mallet first
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Post by xxbenjamminxx on Oct 2, 2012 21:59:15 GMT -5
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Post by millsc on Oct 2, 2012 22:04:11 GMT -5
never had to bore the case its not common the exhaust is a good loud not ridiculous sounds awesome ive posted vids of the exhaust several times its no where near harley loud just dont full throttle when near home there will be no need i think his dowels are in the wrong place or it needs oiled and tapped with a rubber mallet and yes its the same kit but get it in silver the black exhaust turns gold
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Post by carasdad on Oct 2, 2012 22:07:52 GMT -5
Do you have an older Baja SC50?..or any other brand of scoot with a QJ engine? They don't fit that engine without case boring. Not sure why QJ made the engine that way instead of like most others did. Also many of the Znen engines have different part requirements.Znen makes the Puma and Amor scooters.
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Post by millsc on Oct 2, 2012 22:10:06 GMT -5
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Post by above118 on Oct 2, 2012 22:12:34 GMT -5
Ive orderd 3 BBKs from that exact same seller..never 1 issue. like Mill said,check the dowels..chances are you have them wrong. ive done it before myself.
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Post by millsc on Oct 2, 2012 22:17:55 GMT -5
i could of got a 52mm would of still fit on my cy50-a without boring
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Post by carasdad on Oct 2, 2012 22:23:50 GMT -5
Ive orderd 3 BBKs from that exact same seller..never 1 issue. like Mill said,check the dowels..chances are you have them wrong. ive done it before myself. Yes....but what scoot do you have?...there are a few QMB139/GY6 50cc anomalies out there.. |
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Post by millsc on Oct 2, 2012 22:24:54 GMT -5
ive never had to bore the case but im sure i could if need be
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Post by skuttadawg on Oct 3, 2012 0:39:10 GMT -5
Did you measure the size of the valves as there is two diff sizes
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Post by above118 on Oct 3, 2012 1:07:49 GMT -5
Ive orderd 3 BBKs from that exact same seller..never 1 issue. like Mill said,check the dowels..chances are you have them wrong. ive done it before myself. Yes....but what scoot do you have?...there are a few QMB139/GY6 50cc anomalies out there.. all 3 were 139qmb..long&short case.. jonway/Cy50-A/sunny MCJ-L4 never once had a problem unless it was my error. |
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Post by skuttadawg on Oct 3, 2012 1:09:01 GMT -5
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Post by Enviromoto on Oct 3, 2012 8:38:42 GMT -5
I've seen this before. Your going to either split the cases, remove the crank, and replace all the seals after you reinstall the crank after you bore the case or buy a smaller bbk.
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Post by carasdad on Oct 3, 2012 9:04:04 GMT -5
Yes....but what scoot do you have?...there are a few QMB139/GY6 50cc anomalies out there.. all 3 were 139qmb..long&short case.. jonway/Cy50-A/sunny MCJ-L4 never once had a problem unless it was my error. Well then you were lucky... and how would his incorrect dowel pin placement make the engine case bore to small for the new cylinder??? Btw you are not talking to an idiot...I suggest you read the link below...it will explain other things folks do not know..  ...then do some research about QMB139 anomalies..as there are more.... Here is an expert from the link. QJ139QMB-3 and QJ1P39QMB-3 anomaly engine tech facts Hey MO! I've got this QJ engine in my Baja Sun City SC50, it's also found in the Vento Triton, and MotoMojo Roadster 50. I'm just confused about what parts fit what?Yes, that is a pretty unique engine. We call it the QJ anomaly. This engine is fundamentally the same, with these differences: 1) The aperture in the crankcase for the cylinder is slightly smaller, making big bore kits difficult without some modification2) The belt size is unique, using the 836-17-30, which we have here. To confuse things a little, it seems the Vento and MotoMojo uses an 891-17-30 belt. 3) The QJ anomoly uses 21mm 2stroke JOG engine variators, rollers and rear clutch pulleys, which are available here. 4) The belt cover is unique also 5) These are often fitted with disc brakes in the rear, making some of these components difficult to acquire. 6) The carburetors that are fitted on these use a different type than standard 139qmb. We would recommend changing the carb to the more common type. This 'idiot"..(me)..has lots more info on QMB139 anomalies and variances... Used to sell scooters...now I just run a repair/parts shop. I have seen nearly every engine made out there..pass through my doors. I will post more links later. Btw...if every BBK fit....why do you think EVERY big bore distributor puts a disclaimer on the product "May not fit all engines,check your engine before ordering" Glenn www.scrappydogscooters.com/Tech_Talk_with_Mo_.htmlwww.monsterscooterparts.com/494gy6scenau.html says.... PLEASE NOTE: There are many different versions of 50cc GY6 style 4-stroke engines used in the Chinese scooter market. Please be sure to check the detailed specifications and dimensions on our specifications page (tab titled "Specs") prior to ordering. |
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Post by millsc on Oct 3, 2012 10:03:57 GMT -5
not looking forward to the day someone brings me one of those variants
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Post by carasdad on Oct 3, 2012 10:20:32 GMT -5
not looking forward to the day someone brings me one of those variants No you are not! The QJ uses a diff carb..and get this...a splined minarelli type variator...and minarelli type clutch and driven wheel. Other variations are the QMB139 that Znen puts out. Beautifully crafted and top notch quality...the Cadillac of GY6 50cc engines though....but some parts are specific to them as well. But Znen is well worth the money spent on one.  |
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Post by above118 on Oct 3, 2012 10:21:15 GMT -5
carasdad... i dont recall me calling you an idiot. I simply stated the fact that I PERSONALLY have not run into that issue. Yes im VERY aware of those anomalies...chances are yep he sure could have one. I was referring him to check the dowels to make sure it wasn't those the were causing it not to seat correctly. rather then jumping right to the conclusion that it was one of those motors. Could have been an oversite in how he assembled it. I like to work out every possible solution before i say "ahhh sh!t,i got one of these"
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Post by above118 on Oct 3, 2012 10:22:27 GMT -5
hopefully to the OP...he doesnt have one of those monsters.
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Post by carasdad on Oct 3, 2012 10:35:47 GMT -5
hopefully to the OP...he doesnt have one of those monsters. Hope not too bro..cause if so...he'd better get some good practice at saying" Oh sh!t...this piece don't fit either" ;D That's one bad thing about Ebay..some buyers are just out to sell...will tell ya anything. When I bought my Hoca 2 stroke BBK from there....one seller claimed his generic brand kit would add 70% more power to my scoot....and mph.  I almost bought his...but it already goes 50 GPS...and that 70% increase would have put me at about 85 mph...not sure I was ready for that...  ....Lmao.... |
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Post by millsc on Oct 3, 2012 10:43:08 GMT -5
id sell that QJ type scooter and buy a different one and put the kit on the new one
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Post by oceancitykid on Oct 4, 2012 7:13:48 GMT -5
You might need the shorter style rocker arms for the valves? That's what I did to my Tao Tao qmb139. Allows room for the cylinder cover to go on.
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Post by carasdad on Oct 4, 2012 7:27:21 GMT -5
You might need the shorter style rocker arms for the valves? That's what I did to my Tao Tao qmb139. Allows room for the cylinder cover to go on. The problem he is having...is that the cylinder will not fit into the case. |
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Post by xxbenjamminxx on Oct 4, 2012 8:06:05 GMT -5
OP - Did you ever end up getting it to fit in the case? Hoping to be placing my order for my kit tonight or tomorrow and would like to hear how yours turned out?
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Post by millsc on Oct 4, 2012 8:06:44 GMT -5
what kind of scoot you have xxxbenjammin
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Post by xxbenjamminxx on Oct 4, 2012 11:48:24 GMT -5
millsc - I have a 2008 Roketa Bahama 50. Basically the same scoot you have except from Roketa. I am petty sure it has the 64mm valves even though its a 1P139QMB. Have had then valve cover off to adjust the valves and dont remember them looking as tall the pics of the 69mm ones.
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Post by millsc on Oct 4, 2012 11:52:10 GMT -5
you'll be fine putting a kit on that ive done several roketas should be 64mm since its a 2008
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Post by endru on Oct 4, 2012 19:56:39 GMT -5
Other variations are the QMB139 that Znen puts out. Beautifully crafted and top notch quality...the Cadillac of GY6 50cc engines though....but some parts are specific to them as well. But Znen is well worth the money spent on one. I agree with you carasdad, my puma amor (Znen) is an excellent machine, especially now that I've done some basic tuning. I'm a little unnerved though - what if mine is an "anomaly" that won't take a standard 100cc kit that I'm hoping to put on it? It would suck to have to bore the case. |
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I almost bought his...but it already goes 50 GPS...and that 70% increase would have put me at about 85 mph...not sure I was ready for that... 
....Lmao....