Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 14, 2013 20:45:40 GMT -5
So I started to tear down my scooter. It is a 03 Vento 125. It has a 152QMI motor in it. I ordered a NCY 61mm cylinder and head. Now this is where my issue is. The heads are different sizes. The 125 head is taller than the new NCY 61mm head. I thought there was only a differnce in the 1P57QMJ, I haven't heard of this with the 152QMI. Not to mention that there is not 1P designation on it. How can I convert it to using the NCY head? The only issues I see are the cam chain will be too long and the head studs will be too long.
|
|
Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 14, 2013 21:10:01 GMT -5
Also on a side note, the super sweet "bolt on" 61mm NCY kit that has a super thin skirt that is supposed to just drop in without boring doesn't. What a build from . If I would have known I needed to bore the cases for this to fit, I would have just went 63mm to begin with and bored the cases.
|
|
Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 15, 2013 12:27:05 GMT -5
Anybody?
|
|
Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 16, 2013 13:53:32 GMT -5
Couple quick measurments, cases are bored to 60.3mm from factory. NCY 61mm BBK sleeve OD is 62.75mm Clearly will not fit. Also note that is a very thin sleeve!
Stock head height is 73mm and the NCY 61mm bvh is 60mm.
|
|
Freshman Rider
Currently Offline
Posts: 68
Likes: 0
Joined: Mar 8, 2013 19:43:16 GMT -5
|
Post by joaoeu on Jun 18, 2013 13:06:20 GMT -5
My understanding is that 157QMJ cases (and possibly 152QMI) are "almost guaranteed" to only fit 58.5mm cylinders (up from 157QMJ's stock 57.5mm).
I don't know about 152QMI exactly, but I had an 80% that they were in the ballpark as well.
As for 60mm "drop-in" replacement, I've only heard about brand-name engines, such as Kymco, SYM, and Buddy.
|
|
Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 18, 2013 21:02:42 GMT -5
|
|
Freshman Rider
Currently Offline
Posts: 68
Likes: 0
Joined: Mar 8, 2013 19:43:16 GMT -5
|
Post by joaoeu on Jun 19, 2013 1:28:43 GMT -5
I'm not worried about having to bore out my cases, just dissapointed as I would have went bigger. Here is one thread of 61mm drop in mentioned scootdawg.proboards.com/post/490838Yea, but notice that his disclaimer would be that he says: "171.3cc kit for most GY6 125/150 engines" Notice the word "for most ..." But then again, at 2.5mm diameter difference, you could (with some patience), file it out by hand. You probably should add another 1mm of clearance or so, for that cylinder to be able to expand it when it's hot. |
|
Sophomore Rider
Currently Offline
Rear wheel drive
Posts: 207
Likes: 0
Joined: Mar 9, 2013 0:05:20 GMT -5
|
Post by justin010304 on Jun 19, 2013 3:05:43 GMT -5
I know it says most, almost every chinese part sold anywhere says that  |
|
