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Post by endacoz on Jul 12, 2015 3:18:07 GMT -5
I picked up a qian 50cc scooter with a Qj1e40qmb. I bought this scoot to ride while I restore my 1984 aero 125 (2 stroke! that I got on CL for $350 a few weeks ago.
I Paid $500 for this chinese scoot, has 4k miles on it. I liked the fact that it has 12" rims! Got it up to 37 mph downhill, only hits 32 on the flat,. (using gps on phone to track speeds. Only 1 owner. It did not sound like he did much to the bike other than he installed a manual choke, wired it in after the petcock and back in just before the carb. to help with starting he said.
It has a nice looking exhaust but not sure how to get specs off it. says Italy on it.
After some research it looks like this scoot should go a little faster.
I'd like to open up the top end and clean it up if needed and clean the carb. Should I new head gaskets or are they reusable? Should I buy a rebuild kit for the carb?
other things I should do / service / check on this scooter?
I can do my own maintenence and engine work.
how do I upload a photo here?
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Post by endacoz on Jul 12, 2015 3:23:02 GMT -5
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Post by oldgeek on Jul 12, 2015 6:02:12 GMT -5
 You got a good looking scoot there, nice find! It definitely sounds like there are a few restrictions on that scooter. I do not know about that particular model, but I assure you someone here likely does. How many miles does it have on it? |
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Post by 90GTVert on Jul 12, 2015 6:37:13 GMT -5
 That's a popular engine. You can find lots of info about it in the Tech Library here in the two-stroke section. That exhaust is common stock on these. Both of my Tritons (also long case 1E40QMBs made by QJ) came with an exhaust like that labeled Silvertone IIRC. It's nothing special, but mine were not restricted. Head gaskets for these are usually copper in stock form. Copper and aluminum head gaskets can be reused as long as they aren't damaged. You can coat them with copper gasket spray, or they may be fine without it. You can even use no head gasket and just copper spray on the head if you find a need to increase compression and reduce squish clearance. Don't do this without checking squish clearance though. Do a compression test so you can see if it's up to par. It starts and runs alright so you have 100psi+ most likely, but usually something around 150-180psi is good for a strong runner. If it's below 150psi then you may wanna check out the cylinder, piston, and rings. Remove carbon buildup while you're in there. If it all is within spec and looks OK, check squish clearance. If it's much over 1mm you may be able to remove the head gasket to raise compression. Minimum is about 0.5mm, but I would usually stick with something like 0.7mm as a minimum for a street engine. Do a compression test after if you change squish too. If it gets much higher than 180psi it could lead to problems with spark knock and overheating. Before you get too deep into it, it may be that the previous owner doesn't have it tuned well. Maybe the carb is out of tune. Maybe the CVT could use some work. Could be a belt wearing and thinning so it can't reach full travel on the pulleys. It should use a 17mm wide belt stock, 15mm is the service limit but you'll have the best top end with belts from 16-17mm. Some of these did have a washer to hold the front pulley open about 1mm more. I found that it didn't restrict my speed in stock form, but made me take off slower. If it's present it may be worth trying the scoot without it though. Removing it may help makeup for a worn belt a little bit. |
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Post by Florida Antique on Jul 12, 2015 6:58:27 GMT -5
Hey great find. That bike looks like a TGB Islander. You should be able to get it to 40mph pretty easily. I'm actually more interested hearing about your Aero. I have a '83 Aero 80 that I restored. I also have a Aero 125 that I am parting out so if you need anything (including a printed service manual), pm me and I might be able to help. Good luck and welcome! |
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Post by endacoz on Jun 17, 2016 16:58:38 GMT -5
I was watching more youtube videos trying to get this thingy to go over 34 mph. I noticed a few people found a restricter in the carburetor. I took it apart and found nothing obvious. I did raise the small clip on the throttle cable needle and drove the bike around. I didn't notice anything different.
So, no restrictor in the carb.
Now where should I look next?
For a washer in the variator
what else
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Post by arkie on Jun 17, 2016 17:13:39 GMT -5
Nice looking scoot. I only wish I could get my hands on a 2t!
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Post by just1artist on Jun 17, 2016 17:33:03 GMT -5
Welcome, killer score!
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Post by niz76 on Jun 17, 2016 19:05:34 GMT -5
That's a 2t Minarelli Horizontal (longcase). Like 90GTVert said, very commonly tuned engine here! You can make that into a 70mph beast with enough $$ and tuning. A Big Bore Kit would be best bang for buck but if you're just looking for more speed without spending much $$ then you may want to start with CVT tuning. Check your belt width like Brent also mentioned and maybe do a "marker test" where you mark the front variator face with a sharpie marker and go for a top speed run and then look and see how far your belt is traveling out on the vari faces by looking at whats left of the marker. Tons of info here everywhere and also in the Tech Library on tuning your 2t Minarelli engine.
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Post by Deleted on Jun 17, 2016 19:17:30 GMT -5
Nice looking scoot. I only wish I could get my hands on a 2t! But it's so much fun riding a slower 4T. They sound good and we do not get mistaken for a weed wacker...well...most of the time. Bill |
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Post by arkie on Jun 17, 2016 19:26:55 GMT -5
Nice looking scoot. I only wish I could get my hands on a 2t! But it's so much fun riding a slower 4T. They sound good and we do not get mistaken for a weed wacker...well...most of the time. Bill You are right of course. I wouldn't know what to do if I didn't have valves to lash and a cam to set. And I would really miss being passed by even garbage trucks. |
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Post by Deleted on Jun 17, 2016 19:57:29 GMT -5
But it's so much fun riding a slower 4T. They sound good and we do not get mistaken for a weed wacker...well...most of the time. Bill You are right of course. I wouldn't know what to do if I didn't have valves to lash and a cam to set. And I would really miss being passed by even garbage trucks. Hey, we LET them pass. Bill |
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Post by dan50 on Jun 17, 2016 23:10:22 GMT -5
Check the reed valve, they can weaken and open up and it causes the air/fuel mix to back up so the cylinder in not getting full enough. This was the case on my 2t.
Also, check the intake manifold for any leaks, I had this problem on my 2t.
Between the 2 problems, I'm surprised the bike even ran!
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Post by endacoz on Jun 20, 2016 22:03:24 GMT -5
I rented a compression tester. Suprising it was only 90 psi.
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Post by niz76 on Jun 21, 2016 0:15:08 GMT -5
I rented a compression tester. Suprising it was only 90 psi. BBK! BBK! BBK!  |
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