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Post by 2strokd on Jul 13, 2009 12:57:17 GMT -5
Is yours a short or long case? How do ya tell the diff? My motor doesnt even say 140qmb anywere on it, i just knew thats what is was after looking at all your pics and other stuff on the net.
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Post by 90GTVert on Jul 13, 2009 13:35:01 GMT -5
I dunno much about the 139QMB. If there is such a thing as short and long case in these, I'd assume mine's a short case... unless some models came with 8" wheels or something. My parts arrived from sunlparts.net, sorta...  I'm less than pleased with the big bore kit. It is missing the oil pump, instructions (which doesn't really worry me), and whatever the gear is shown on their site. Maybe a variator face or something? I sent an email requesting the missing parts promptly (I really don't wanna be waiting another 2 weeks).  The cylinder and head are each packaged in thin plastic with no sort of anti-corrosion chemical. The brand new cylinder is rusty. It can be cleaned off, but it's not really a great sign of parts quality... not that I expected this to be world class for $100... but I did expect it to be complete and not rusty.   I'm too used to dealing with the 90cc+ stuff for my scooter I guess, because the piston and valves and everything looks tiny to me. I'll be suprised if this head is any different than stock.  |
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 13, 2009 14:32:35 GMT -5
damn thats small, i guess the old saying goes you get what you pay for.....
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Post by 90GTVert on Jul 13, 2009 14:41:30 GMT -5
That's kinda inaccurate here Bob. I paid for more parts than I got! lol
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Post by 2strokd on Jul 13, 2009 14:54:15 GMT -5
I would be ashamed to sell anybody parts like that $100 bucks or not. Thats worse than buying brand new rusted brake rotors. And to top it off they didnt send the complete set of rusted parts with the kit. I wouldnt be happy, you are gonna complain to the place you got it right?
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Post by 90GTVert on Jul 13, 2009 15:27:22 GMT -5
I already sent an email asking for my parts promptly. I never said anything about the rust. I can take care of that easy enough.
I never realised it before, but it's pedez2000 from ScootDawg running sunlparts.net. It's right in his signature over there, but somehow I missed it.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 13, 2009 15:41:00 GMT -5
That's kinda inaccurate here Bob. I paid for more parts than I got! lol you what im saying........ that sucks any way that you got the shaft.... |
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Post by 90GTVert on Jul 13, 2009 21:18:09 GMT -5
I almost go tthe big bore kit installed (minus the oil pump of course). I was torqueing the camshaft holder/rocker assembly, on the last nut of course, when the stud snapped. It snapped before I even reached 13ft/lbs on the torque wrench (and yes, my wrench was recently calibrated by Snap-On so it should be accurate). These stupid little 4 stroke studs are 6.85mm diameter on the ends (M7 I believe) and then narrow down to 5.2mm in the center. Even at that size, you'd think it wouldn't snap at under 13ft/lbs.  Hopefully I can find replacement studs. I wish I could find some solid M7 studs, but I'll take what I can get at this point. I guess this was a fluke or maybe I shoulda treated this thing like my car. I pull the studs out, clean the threads, apply ARP thread lube, and install them finger tight every time I remove the cylinder heads. I didn't really think all that was necessary in this case. If anyone knows a good source of studs, lemme know. I'm hoping to find a set and order tonight to get 'em on the way ASAP. This cylinder kit has needed everything checked too. It was rusty. The ring end gap for the 2nd ring was off. It was .004" and I wanted .009". (I'm using bore diameter" x .004" for the top ring and bore diameter' x .005" for the 2nd ring.) The exhaust port was kind of out of round. The intake port had a casting clump in it (beyond normal casting imperfections, a clump of material). I'd suggest leaving this kit alone unless you don't mind doing some cleanup work. It really sucks getting this far... to the point where the only things left are valve adjustment and putting the valve cover on basically... and then having something stupid happen. Not that it woulda been great if something bad happened at any point.  |
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Post by 90GTVert on Jul 13, 2009 21:35:15 GMT -5
Partsforscooters carry studs, but it looks like either there are 2 different sizes per engine or there could be just 2 different potential sizes. I think it's 2 short and 2 long, but I guess I gotta check to be sure. I'm missing my 2 strokes now.  |
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Post by 90GTVert on Jul 13, 2009 21:47:45 GMT -5
2 6.5" and 2 6.75" studs.
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Post by 90GTVert on Jul 13, 2009 22:49:56 GMT -5
Oh, while looking around I also see that there are short and long case versions of the 139qmb. Mine is a short case. It looks like the CVT cover's are different. Short case looks like mine, long case looks more like the standard 150cc GY6 covers.
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Post by erictheviking666 on Jul 14, 2009 0:21:07 GMT -5
Long case is with 12" wheels usually.
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Bob
Scoot Enthusiast
The Builder
Posts: 199
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Post by Bob on Jul 14, 2009 6:42:33 GMT -5
damn i bet you were/are pissed.... sorry to hear about your broken stud.....prob be another week or so before you get a stud.... ill ask ron at the shop today and see if ican get one from him. before you order it i know jeff has a few junk motors in his back yard, ill see if i can get a few parts off of his. gimme a ring when you get this message.
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Post by 90GTVert on Jul 14, 2009 8:39:54 GMT -5
It's the next day and I'm still mad. I've ordered the studs already. I'll give you a call though, I forgot to order new gaskets!  |
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Post by 2strokd on Jul 14, 2009 9:08:57 GMT -5
Dang, sorry to hear the bad news about the weak stud. At least it didnt break when you got it all back together and your dad was riding it. I asked about the cases because mine has the same wheels and i have enough room for 12,s on mine. I knows mines a 2t and that one is a 4stroker, but its good to know that there is short and long 4stroke cases too for future scoots.
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